canboot: initial source commit

Signed-off-by:  Eric Callahan <arksine.code@gmail.com>

Makefile

@@ -0,0 +1,135 @@
+# CanBoot build system
+#
+# Copyright (C) 2016-2020  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+
+# Output directory
+OUT=out/
+
+# Kconfig includes
+export KCONFIG_CONFIG     := $(CURDIR)/.config
+-include $(KCONFIG_CONFIG)
+
+# Common command definitions
+CC=$(CROSS_PREFIX)gcc
+AS=$(CROSS_PREFIX)as
+LD=$(CROSS_PREFIX)ld
+OBJCOPY=$(CROSS_PREFIX)objcopy
+OBJDUMP=$(CROSS_PREFIX)objdump
+STRIP=$(CROSS_PREFIX)strip
+CPP=cpp
+PYTHON=python2
+
+# Source files
+src-y =
+dirs-y = src
+
+# Default compiler flags
+cc-option=$(shell if test -z "`$(1) $(2) -S -o /dev/null -xc /dev/null 2>&1`" \
+    ; then echo "$(2)"; else echo "$(3)"; fi ;)
+
+CFLAGS := -I$(OUT) -Isrc -I$(OUT)board-generic/ -std=gnu11 -O2 -MD -g \
+    -Wall -Wold-style-definition $(call cc-option,$(CC),-Wtype-limits,) \
+    -ffunction-sections -fdata-sections
+CFLAGS += -flto -fwhole-program -fno-use-linker-plugin
+
+OBJS_canboot.elf = $(patsubst %.c, $(OUT)src/%.o,$(src-y))
+OBJS_canboot.elf += $(OUT)compile_time_request.o
+CFLAGS_canboot.elf = $(CFLAGS) -Wl,--gc-sections
+
+CPPFLAGS = -I$(OUT) -P -MD -MT $@
+
+# Default targets
+target-y := $(OUT)canboot.elf
+
+all:
+
+# Run with "make V=1" to see the actual compile commands
+ifdef V
+Q=
+else
+Q=@
+MAKEFLAGS += --no-print-directory
+endif
+
+# Status LED def for buildcommands.py
+ifdef CONFIG_STATUS_LED_PIN
+LED_OPT= -l $(CONFIG_STATUS_LED_PIN)
+else
+LED_OPT=
+endif
+
+# Include board specific makefile
+include src/Makefile
+-include src/$(patsubst "%",%,$(CONFIG_BOARD_DIRECTORY))/Makefile
+
+################ Main build rules
+
+$(OUT)%.o: %.c $(OUT)autoconf.h
+	@echo "  Compiling $@"
+	$(Q)$(CC) $(CFLAGS) -c $< -o $@
+
+$(OUT)%.ld: %.lds.S $(OUT)autoconf.h
+	@echo "  Preprocessing $@"
+	$(Q)$(CPP) -I$(OUT) -P -MD -MT $@ $< -o $@
+
+$(OUT)canboot.elf: $(OBJS_canboot.elf)
+	@echo "  Linking $@"
+	$(Q)$(CC) $(OBJS_canboot.elf) $(CFLAGS_canboot.elf) -o $@
+	$(Q)scripts/check-gcc.sh $@ $(OUT)compile_time_request.o
+
+################ Compile time requests
+
+$(OUT)%.o.ctr: $(OUT)%.o
+	$(Q)$(OBJCOPY) -j '.compile_time_request' -O binary $^ $@
+
+$(OUT)compile_time_request.o: $(patsubst %.c, $(OUT)src/%.o.ctr,$(src-y)) ./scripts/buildcommands.py
+	@echo "  Building $@"
+	$(Q)cat $(patsubst %.c, $(OUT)src/%.o.ctr,$(src-y)) | tr -s '\0' '\n' > $(OUT)compile_time_request.txt
+	$(Q)$(PYTHON) ./scripts/buildcommands.py $(LED_OPT) $(OUT)compile_time_request.txt $(OUT)compile_time_request.c
+	$(Q)$(CC) $(CFLAGS) -c $(OUT)compile_time_request.c -o $@
+
+################ Auto generation of "board/" include file link
+
+$(OUT)board-link: $(KCONFIG_CONFIG)
+	@echo "  Creating symbolic link $(OUT)board"
+	$(Q)mkdir -p $(addprefix $(OUT), $(dirs-y))
+	$(Q)echo "#$(CONFIG_BOARD_DIRECTORY)" > $@.temp
+	$(Q)if ! cmp -s $@.temp $@; then rm -f $(OUT)*.d $(patsubst %,$(OUT)%/*.d,$(dirs-y)) ; mv $@.temp $@ ; fi
+	$(Q)rm -f $(OUT)board
+	$(Q)ln -sf $(PWD)/src/$(CONFIG_BOARD_DIRECTORY) $(OUT)board
+	$(Q)mkdir -p $(OUT)board-generic
+	$(Q)rm -f $(OUT)board-generic/board
+	$(Q)ln -sf $(PWD)/src/generic $(OUT)board-generic/board
+
+include $(OUT)board-link
+
+################ Kconfig rules
+
+$(OUT)autoconf.h: $(KCONFIG_CONFIG)
+	@echo "  Building $@"
+	$(Q)mkdir -p $(OUT)
+	$(Q) KCONFIG_AUTOHEADER=$@ $(PYTHON) lib/kconfiglib/genconfig.py src/Kconfig
+
+$(KCONFIG_CONFIG) olddefconfig: src/Kconfig
+	$(Q)$(PYTHON) lib/kconfiglib/olddefconfig.py src/Kconfig
+
+menuconfig:
+	$(Q)$(PYTHON) lib/kconfiglib/menuconfig.py src/Kconfig
+
+################ Generic rules
+
+# Make definitions
+.PHONY : all clean distclean olddefconfig menuconfig FORCE
+.DELETE_ON_ERROR:
+
+all: $(target-y)
+
+clean:
+	$(Q)rm -rf $(OUT)
+
+distclean: clean
+	$(Q)rm -f .config .config.old
+
+-include $(OUT)*.d $(patsubst %,$(OUT)%/*.d,$(dirs-y))

lib/.gitignore

@@ -0,0 +1,5 @@
+*.o
+bossac/bin/
+bossac/obj/
+hidflash/hid-flash
+hub-ctrl/hub-ctrl

lib/README

@@ -0,0 +1,86 @@
+This directory contains external library code.
+
+The cmsis directory contains code from:
+  https://github.com/ARM-software/CMSIS_5
+version 5.3.0 (49ac527aa7406cecbba46d4d3bdbc7f60c6c6d42). Contents
+taken from the CMSIS/Core/Include/ directory.
+
+The sam3x directory contains code from the
+Atmel.SAM3X_DFP.1.0.50.atpack zip file found at:
+  http://packs.download.atmel.com/
+version 1.0.50 (extracted on 20180725).
+
+The sam4e directory contains code from the
+Atmel.SAM4E_DFP.1.1.57.atpack zip file found at:
+  http://packs.download.atmel.com/
+version 1.1.57 (extracted on 20180806). It has been modified to fix
+some AFEC register RW accesses. See sam4e.patch for the modifications.
+
+The sam4s directory contains code from the
+Atmel.SAM4S_DFP.1.0.56.atpack zip file found at:
+  http://packs.download.atmel.com/
+version 1.0.56 (extracted on 20181220).
+
+The samd21 directory contains code from the
+Atmel.SAMD21_DFP.1.3.304.atpack zip file found at:
+  http://packs.download.atmel.com/
+version 1.3.304 (extracted on 20180725).
+
+The samd51 directory contains code from the
+Atmel.SAMD51_DFP.1.1.96.atpack zip file found at:
+  http://packs.download.atmel.com/
+version 1.1.96 (extracted on 20190110).
+
+The lpc176x directory contains code from the mbed project:
+  https://github.com/ARMmbed/mbed-os
+version mbed-os-5.8.3 (c05d72c3c005fbb7e92c3994c32bda45218ae7fe).
+Contents taken from the targets/TARGET_NXP/TARGET_LPC176X/ directory.
+It has been modified to set the appropriate clock speeds on the
+LPC1768 and LPC1769. See lpc176x.patch for the modifications.
+
+The stm32f0 directory contains code from STMicroelectronics:
+  http://www.st.com/en/embedded-software/stm32cubef1.html
+version 1.10.0 (extracted 20190721).
+
+The stm32f1 directory contains code from STMicroelectronics:
+  http://www.st.com/en/embedded-software/stm32cubef1.html
+version 1.8.0 (extracted 20190721).
+
+The stm32f2 directory contains code from STMicroelectronics:
+  https://www.st.com/content/st_com/en/products/embedded-software/mcu-mpu-embedded-software/stm32-embedded-software/stm32cube-mcu-mpu-packages/stm32cubef2.html
+version 1.9.0 (extracted 20200614).
+
+The stm32f4 directory contains code from STMicroelectronics:
+  http://www.st.com/en/embedded-software/stm32cubef4.html
+version 1.24.0 (extracted 20190723).
+
+The hub-ctrl directory contains code from:
+  https://github.com/codazoda/hub-ctrl.c/
+revision 42095e522859059e8a5f4ec05c1e3def01a870a9.
+
+The bossac directory contains code from:
+  https://github.com/shumatech/BOSSA
+version 1.9 (b176eeef918fc810045c832348590595120187b4).
+
+The hidflash directory contains code from:
+  https://github.com/Serasidis/STM32_HID_Bootloader
+version 2.2.2 (2ab7927a27b7b78ef730782ea5f9b5d2c8f34671). It has been
+modified to work with Klipper - see hidflash/README for the
+details. See changes.diff for the modifications.
+
+The pru_rpmsg directory contains code from:
+  https://github.com/dinuxbg/pru-gcc-examples
+revision 425a42d82006cf0aa24be27b483d2f6a41607489. The code is taken
+from the repo's hc-sr04-range-sensor directory. It has been modified
+so that the IEP definitions compile correctly. See pru_rpmsg.patch for
+the modifications.
+
+The fast-hash directory contains code from:
+  https://github.com/ztanml/fast-hash
+revision ae3bb53c199fe75619e940b5b6a3584ede99c5fc
+
+The kconfiglib directory contains code from:
+  https://github.com/ulfalizer/Kconfiglib.git
+version v14.1.0 (061e71f7d78cb057762d88de088055361863deff). It has
+been modified to always emit symbols and to simplify the "menuconfig"
+screens. See kconfiglib.patch for the modifications.

lib/cmsis-core/cmsis_compiler.h

@@ -0,0 +1,266 @@
+/**************************************************************************//**
+ * @file     cmsis_compiler.h
+ * @brief    CMSIS compiler generic header file
+ * @version  V5.0.4
+ * @date     10. January 2018
+ ******************************************************************************/
+/*
+ * Copyright (c) 2009-2018 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __CMSIS_COMPILER_H
+#define __CMSIS_COMPILER_H
+
+#include <stdint.h>
+
+/*
+ * Arm Compiler 4/5
+ */
+#if   defined ( __CC_ARM )
+  #include "cmsis_armcc.h"
+
+
+/*
+ * Arm Compiler 6 (armclang)
+ */
+#elif defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050)
+  #include "cmsis_armclang.h"
+
+
+/*
+ * GNU Compiler
+ */
+#elif defined ( __GNUC__ )
+  #include "cmsis_gcc.h"
+
+
+/*
+ * IAR Compiler
+ */
+#elif defined ( __ICCARM__ )
+  #include <cmsis_iccarm.h>
+
+
+/*
+ * TI Arm Compiler
+ */
+#elif defined ( __TI_ARM__ )
+  #include <cmsis_ccs.h>
+
+  #ifndef   __ASM
+    #define __ASM                                  __asm
+  #endif
+  #ifndef   __INLINE
+    #define __INLINE                               inline
+  #endif
+  #ifndef   __STATIC_INLINE
+    #define __STATIC_INLINE                        static inline
+  #endif
+  #ifndef   __STATIC_FORCEINLINE
+    #define __STATIC_FORCEINLINE                   __STATIC_INLINE
+  #endif
+  #ifndef   __NO_RETURN
+    #define __NO_RETURN                            __attribute__((noreturn))
+  #endif
+  #ifndef   __USED
+    #define __USED                                 __attribute__((used))
+  #endif
+  #ifndef   __WEAK
+    #define __WEAK                                 __attribute__((weak))
+  #endif
+  #ifndef   __PACKED
+    #define __PACKED                               __attribute__((packed))
+  #endif
+  #ifndef   __PACKED_STRUCT
+    #define __PACKED_STRUCT                        struct __attribute__((packed))
+  #endif
+  #ifndef   __PACKED_UNION
+    #define __PACKED_UNION                         union __attribute__((packed))
+  #endif
+  #ifndef   __UNALIGNED_UINT32        /* deprecated */
+    struct __attribute__((packed)) T_UINT32 { uint32_t v; };
+    #define __UNALIGNED_UINT32(x)                  (((struct T_UINT32 *)(x))->v)
+  #endif
+  #ifndef   __UNALIGNED_UINT16_WRITE
+    __PACKED_STRUCT T_UINT16_WRITE { uint16_t v; };
+    #define __UNALIGNED_UINT16_WRITE(addr, val)    (void)((((struct T_UINT16_WRITE *)(void*)(addr))->v) = (val))
+  #endif
+  #ifndef   __UNALIGNED_UINT16_READ
+    __PACKED_STRUCT T_UINT16_READ { uint16_t v; };
+    #define __UNALIGNED_UINT16_READ(addr)          (((const struct T_UINT16_READ *)(const void *)(addr))->v)
+  #endif
+  #ifndef   __UNALIGNED_UINT32_WRITE
+    __PACKED_STRUCT T_UINT32_WRITE { uint32_t v; };
+    #define __UNALIGNED_UINT32_WRITE(addr, val)    (void)((((struct T_UINT32_WRITE *)(void *)(addr))->v) = (val))
+  #endif
+  #ifndef   __UNALIGNED_UINT32_READ
+    __PACKED_STRUCT T_UINT32_READ { uint32_t v; };
+    #define __UNALIGNED_UINT32_READ(addr)          (((const struct T_UINT32_READ *)(const void *)(addr))->v)
+  #endif
+  #ifndef   __ALIGNED
+    #define __ALIGNED(x)                           __attribute__((aligned(x)))
+  #endif
+  #ifndef   __RESTRICT
+    #warning No compiler specific solution for __RESTRICT. __RESTRICT is ignored.
+    #define __RESTRICT
+  #endif
+
+
+/*
+ * TASKING Compiler
+ */
+#elif defined ( __TASKING__ )
+  /*
+   * The CMSIS functions have been implemented as intrinsics in the compiler.
+   * Please use "carm -?i" to get an up to date list of all intrinsics,
+   * Including the CMSIS ones.
+   */
+
+  #ifndef   __ASM
+    #define __ASM                                  __asm
+  #endif
+  #ifndef   __INLINE
+    #define __INLINE                               inline
+  #endif
+  #ifndef   __STATIC_INLINE
+    #define __STATIC_INLINE                        static inline
+  #endif
+  #ifndef   __STATIC_FORCEINLINE
+    #define __STATIC_FORCEINLINE                   __STATIC_INLINE
+  #endif
+  #ifndef   __NO_RETURN
+    #define __NO_RETURN                            __attribute__((noreturn))
+  #endif
+  #ifndef   __USED
+    #define __USED                                 __attribute__((used))
+  #endif
+  #ifndef   __WEAK
+    #define __WEAK                                 __attribute__((weak))
+  #endif
+  #ifndef   __PACKED
+    #define __PACKED                               __packed__
+  #endif
+  #ifndef   __PACKED_STRUCT
+    #define __PACKED_STRUCT                        struct __packed__
+  #endif
+  #ifndef   __PACKED_UNION
+    #define __PACKED_UNION                         union __packed__
+  #endif
+  #ifndef   __UNALIGNED_UINT32        /* deprecated */
+    struct __packed__ T_UINT32 { uint32_t v; };
+    #define __UNALIGNED_UINT32(x)                  (((struct T_UINT32 *)(x))->v)
+  #endif
+  #ifndef   __UNALIGNED_UINT16_WRITE
+    __PACKED_STRUCT T_UINT16_WRITE { uint16_t v; };
+    #define __UNALIGNED_UINT16_WRITE(addr, val)    (void)((((struct T_UINT16_WRITE *)(void *)(addr))->v) = (val))
+  #endif
+  #ifndef   __UNALIGNED_UINT16_READ
+    __PACKED_STRUCT T_UINT16_READ { uint16_t v; };
+    #define __UNALIGNED_UINT16_READ(addr)          (((const struct T_UINT16_READ *)(const void *)(addr))->v)
+  #endif
+  #ifndef   __UNALIGNED_UINT32_WRITE
+    __PACKED_STRUCT T_UINT32_WRITE { uint32_t v; };
+    #define __UNALIGNED_UINT32_WRITE(addr, val)    (void)((((struct T_UINT32_WRITE *)(void *)(addr))->v) = (val))
+  #endif
+  #ifndef   __UNALIGNED_UINT32_READ
+    __PACKED_STRUCT T_UINT32_READ { uint32_t v; };
+    #define __UNALIGNED_UINT32_READ(addr)          (((const struct T_UINT32_READ *)(const void *)(addr))->v)
+  #endif
+  #ifndef   __ALIGNED
+    #define __ALIGNED(x)              __align(x)
+  #endif
+  #ifndef   __RESTRICT
+    #warning No compiler specific solution for __RESTRICT. __RESTRICT is ignored.
+    #define __RESTRICT
+  #endif
+
+
+/*
+ * COSMIC Compiler
+ */
+#elif defined ( __CSMC__ )
+   #include <cmsis_csm.h>
+
+ #ifndef   __ASM
+    #define __ASM                                  _asm
+  #endif
+  #ifndef   __INLINE
+    #define __INLINE                               inline
+  #endif
+  #ifndef   __STATIC_INLINE
+    #define __STATIC_INLINE                        static inline
+  #endif
+  #ifndef   __STATIC_FORCEINLINE
+    #define __STATIC_FORCEINLINE                   __STATIC_INLINE
+  #endif
+  #ifndef   __NO_RETURN
+    // NO RETURN is automatically detected hence no warning here
+    #define __NO_RETURN
+  #endif
+  #ifndef   __USED
+    #warning No compiler specific solution for __USED. __USED is ignored.
+    #define __USED
+  #endif
+  #ifndef   __WEAK
+    #define __WEAK                                 __weak
+  #endif
+  #ifndef   __PACKED
+    #define __PACKED                               @packed
+  #endif
+  #ifndef   __PACKED_STRUCT
+    #define __PACKED_STRUCT                        @packed struct
+  #endif
+  #ifndef   __PACKED_UNION
+    #define __PACKED_UNION                         @packed union
+  #endif
+  #ifndef   __UNALIGNED_UINT32        /* deprecated */
+    @packed struct T_UINT32 { uint32_t v; };
+    #define __UNALIGNED_UINT32(x)                  (((struct T_UINT32 *)(x))->v)
+  #endif
+  #ifndef   __UNALIGNED_UINT16_WRITE
+    __PACKED_STRUCT T_UINT16_WRITE { uint16_t v; };
+    #define __UNALIGNED_UINT16_WRITE(addr, val)    (void)((((struct T_UINT16_WRITE *)(void *)(addr))->v) = (val))
+  #endif
+  #ifndef   __UNALIGNED_UINT16_READ
+    __PACKED_STRUCT T_UINT16_READ { uint16_t v; };
+    #define __UNALIGNED_UINT16_READ(addr)          (((const struct T_UINT16_READ *)(const void *)(addr))->v)
+  #endif
+  #ifndef   __UNALIGNED_UINT32_WRITE
+    __PACKED_STRUCT T_UINT32_WRITE { uint32_t v; };
+    #define __UNALIGNED_UINT32_WRITE(addr, val)    (void)((((struct T_UINT32_WRITE *)(void *)(addr))->v) = (val))
+  #endif
+  #ifndef   __UNALIGNED_UINT32_READ
+    __PACKED_STRUCT T_UINT32_READ { uint32_t v; };
+    #define __UNALIGNED_UINT32_READ(addr)          (((const struct T_UINT32_READ *)(const void *)(addr))->v)
+  #endif
+  #ifndef   __ALIGNED
+    #warning No compiler specific solution for __ALIGNED. __ALIGNED is ignored.
+    #define __ALIGNED(x)
+  #endif
+  #ifndef   __RESTRICT
+    #warning No compiler specific solution for __RESTRICT. __RESTRICT is ignored.
+    #define __RESTRICT
+  #endif
+
+
+#else
+  #error Unknown compiler.
+#endif
+
+
+#endif /* __CMSIS_COMPILER_H */
+

lib/cmsis-core/cmsis_version.h

@@ -0,0 +1,39 @@
+/**************************************************************************//**
+ * @file     cmsis_version.h
+ * @brief    CMSIS Core(M) Version definitions
+ * @version  V5.0.2
+ * @date     19. April 2017
+ ******************************************************************************/
+/*
+ * Copyright (c) 2009-2017 ARM Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if   defined ( __ICCARM__ )
+  #pragma system_include         /* treat file as system include file for MISRA check */
+#elif defined (__clang__)
+  #pragma clang system_header   /* treat file as system include file */
+#endif
+
+#ifndef __CMSIS_VERSION_H
+#define __CMSIS_VERSION_H
+
+/*  CMSIS Version definitions */
+#define __CM_CMSIS_VERSION_MAIN  ( 5U)                                      /*!< [31:16] CMSIS Core(M) main version */
+#define __CM_CMSIS_VERSION_SUB   ( 1U)                                      /*!< [15:0]  CMSIS Core(M) sub version */
+#define __CM_CMSIS_VERSION       ((__CM_CMSIS_VERSION_MAIN << 16U) | \
+                                   __CM_CMSIS_VERSION_SUB           )       /*!< CMSIS Core(M) version number */
+#endif

lib/cmsis-core/core_cm0.h

@@ -0,0 +1,888 @@
+/**************************************************************************//**
+ * @file     core_cm0.h
+ * @brief    CMSIS Cortex-M0 Core Peripheral Access Layer Header File
+ * @version  V5.0.3
+ * @date     10. January 2018
+ ******************************************************************************/
+/*
+ * Copyright (c) 2009-2018 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#if   defined ( __ICCARM__ )
+  #pragma system_include         /* treat file as system include file for MISRA check */
+#elif defined (__clang__)
+  #pragma clang system_header   /* treat file as system include file */
+#endif
+
+#ifndef __CORE_CM0_H_GENERIC
+#define __CORE_CM0_H_GENERIC
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/**
+  \page CMSIS_MISRA_Exceptions  MISRA-C:2004 Compliance Exceptions
+  CMSIS violates the following MISRA-C:2004 rules:
+
+   \li Required Rule 8.5, object/function definition in header file.<br>
+     Function definitions in header files are used to allow 'inlining'.
+
+   \li Required Rule 18.4, declaration of union type or object of union type: '{...}'.<br>
+     Unions are used for effective representation of core registers.
+
+   \li Advisory Rule 19.7, Function-like macro defined.<br>
+     Function-like macros are used to allow more efficient code.
+ */
+
+
+/*******************************************************************************
+ *                 CMSIS definitions
+ ******************************************************************************/
+/**
+  \ingroup Cortex_M0
+  @{
+ */
+
+#include "cmsis_version.h"
+ 
+/*  CMSIS CM0 definitions */
+#define __CM0_CMSIS_VERSION_MAIN  (__CM_CMSIS_VERSION_MAIN)              /*!< \deprecated [31:16] CMSIS HAL main version */
+#define __CM0_CMSIS_VERSION_SUB   (__CM_CMSIS_VERSION_SUB)               /*!< \deprecated [15:0]  CMSIS HAL sub version */
+#define __CM0_CMSIS_VERSION       ((__CM0_CMSIS_VERSION_MAIN << 16U) | \
+                                    __CM0_CMSIS_VERSION_SUB           )  /*!< \deprecated CMSIS HAL version number */
+
+#define __CORTEX_M                (0U)                                   /*!< Cortex-M Core */
+
+/** __FPU_USED indicates whether an FPU is used or not.
+    This core does not support an FPU at all
+*/
+#define __FPU_USED       0U
+
+#if defined ( __CC_ARM )
+  #if defined __TARGET_FPU_VFP
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#elif defined (__ARMCC_VERSION) && (__ARMCC_VERSION >= 6010050)
+  #if defined __ARM_PCS_VFP
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#elif defined ( __GNUC__ )
+  #if defined (__VFP_FP__) && !defined(__SOFTFP__)
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#elif defined ( __ICCARM__ )
+  #if defined __ARMVFP__
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#elif defined ( __TI_ARM__ )
+  #if defined __TI_VFP_SUPPORT__
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#elif defined ( __TASKING__ )
+  #if defined __FPU_VFP__
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#elif defined ( __CSMC__ )
+  #if ( __CSMC__ & 0x400U)
+    #error "Compiler generates FPU instructions for a device without an FPU (check __FPU_PRESENT)"
+  #endif
+
+#endif
+
+#include "cmsis_compiler.h"               /* CMSIS compiler specific defines */
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CORE_CM0_H_GENERIC */
+
+#ifndef __CMSIS_GENERIC
+
+#ifndef __CORE_CM0_H_DEPENDANT
+#define __CORE_CM0_H_DEPENDANT
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* check device defines and use defaults */
+#if defined __CHECK_DEVICE_DEFINES
+  #ifndef __CM0_REV
+    #define __CM0_REV               0x0000U
+    #warning "__CM0_REV not defined in device header file; using default!"
+  #endif
+
+  #ifndef __NVIC_PRIO_BITS
+    #define __NVIC_PRIO_BITS          2U
+    #warning "__NVIC_PRIO_BITS not defined in device header file; using default!"
+  #endif
+
+  #ifndef __Vendor_SysTickConfig
+    #define __Vendor_SysTickConfig    0U
+    #warning "__Vendor_SysTickConfig not defined in device header file; using default!"
+  #endif
+#endif
+
+/* IO definitions (access restrictions to peripheral registers) */
+/**
+    \defgroup CMSIS_glob_defs CMSIS Global Defines
+
+    <strong>IO Type Qualifiers</strong> are used
+    \li to specify the access to peripheral variables.
+    \li for automatic generation of peripheral register debug information.
+*/
+#ifdef __cplusplus
+  #define   __I     volatile             /*!< Defines 'read only' permissions */
+#else
+  #define   __I     volatile const       /*!< Defines 'read only' permissions */
+#endif
+#define     __O     volatile             /*!< Defines 'write only' permissions */
+#define     __IO    volatile             /*!< Defines 'read / write' permissions */
+
+/* following defines should be used for structure members */
+#define     __IM     volatile const      /*! Defines 'read only' structure member permissions */
+#define     __OM     volatile            /*! Defines 'write only' structure member permissions */
+#define     __IOM    volatile            /*! Defines 'read / write' structure member permissions */
+
+/*@} end of group Cortex_M0 */
+
+
+
+/*******************************************************************************
+ *                 Register Abstraction
+  Core Register contain:
+  - Core Register
+  - Core NVIC Register
+  - Core SCB Register
+  - Core SysTick Register
+ ******************************************************************************/
+/**
+  \defgroup CMSIS_core_register Defines and Type Definitions
+  \brief Type definitions and defines for Cortex-M processor based devices.
+*/
+
+/**
+  \ingroup    CMSIS_core_register
+  \defgroup   CMSIS_CORE  Status and Control Registers
+  \brief      Core Register type definitions.
+  @{
+ */
+
+/**
+  \brief  Union type to access the Application Program Status Register (APSR).
+ */
+typedef union
+{
+  struct
+  {
+    uint32_t _reserved0:28;              /*!< bit:  0..27  Reserved */
+    uint32_t V:1;                        /*!< bit:     28  Overflow condition code flag */
+    uint32_t C:1;                        /*!< bit:     29  Carry condition code flag */
+    uint32_t Z:1;                        /*!< bit:     30  Zero condition code flag */
+    uint32_t N:1;                        /*!< bit:     31  Negative condition code flag */
+  } b;                                   /*!< Structure used for bit  access */
+  uint32_t w;                            /*!< Type      used for word access */
+} APSR_Type;
+
+/* APSR Register Definitions */
+#define APSR_N_Pos                         31U                                            /*!< APSR: N Position */
+#define APSR_N_Msk                         (1UL << APSR_N_Pos)                            /*!< APSR: N Mask */
+
+#define APSR_Z_Pos                         30U                                            /*!< APSR: Z Position */
+#define APSR_Z_Msk                         (1UL << APSR_Z_Pos)                            /*!< APSR: Z Mask */
+
+#define APSR_C_Pos                         29U                                            /*!< APSR: C Position */
+#define APSR_C_Msk                         (1UL << APSR_C_Pos)                            /*!< APSR: C Mask */
+
+#define APSR_V_Pos                         28U                                            /*!< APSR: V Position */
+#define APSR_V_Msk                         (1UL << APSR_V_Pos)                            /*!< APSR: V Mask */
+
+
+/**
+  \brief  Union type to access the Interrupt Program Status Register (IPSR).
+ */
+typedef union
+{
+  struct
+  {
+    uint32_t ISR:9;                      /*!< bit:  0.. 8  Exception number */
+    uint32_t _reserved0:23;              /*!< bit:  9..31  Reserved */
+  } b;                                   /*!< Structure used for bit  access */
+  uint32_t w;                            /*!< Type      used for word access */
+} IPSR_Type;
+
+/* IPSR Register Definitions */
+#define IPSR_ISR_Pos                        0U                                            /*!< IPSR: ISR Position */
+#define IPSR_ISR_Msk                       (0x1FFUL /*<< IPSR_ISR_Pos*/)                  /*!< IPSR: ISR Mask */
+
+
+/**
+  \brief  Union type to access the Special-Purpose Program Status Registers (xPSR).
+ */
+typedef union
+{
+  struct
+  {
+    uint32_t ISR:9;                      /*!< bit:  0.. 8  Exception number */
+    uint32_t _reserved0:15;              /*!< bit:  9..23  Reserved */
+    uint32_t T:1;                        /*!< bit:     24  Thumb bit        (read 0) */
+    uint32_t _reserved1:3;               /*!< bit: 25..27  Reserved */
+    uint32_t V:1;                        /*!< bit:     28  Overflow condition code flag */
+    uint32_t C:1;                        /*!< bit:     29  Carry condition code flag */
+    uint32_t Z:1;                        /*!< bit:     30  Zero condition code flag */
+    uint32_t N:1;                        /*!< bit:     31  Negative condition code flag */
+  } b;                                   /*!< Structure used for bit  access */
+  uint32_t w;                            /*!< Type      used for word access */
+} xPSR_Type;
+
+/* xPSR Register Definitions */
+#define xPSR_N_Pos                         31U                                            /*!< xPSR: N Position */
+#define xPSR_N_Msk                         (1UL << xPSR_N_Pos)                            /*!< xPSR: N Mask */
+
+#define xPSR_Z_Pos                         30U                                            /*!< xPSR: Z Position */
+#define xPSR_Z_Msk                         (1UL << xPSR_Z_Pos)                            /*!< xPSR: Z Mask */
+
+#define xPSR_C_Pos                         29U                                            /*!< xPSR: C Position */
+#define xPSR_C_Msk                         (1UL << xPSR_C_Pos)                            /*!< xPSR: C Mask */
+
+#define xPSR_V_Pos                         28U                                            /*!< xPSR: V Position */
+#define xPSR_V_Msk                         (1UL << xPSR_V_Pos)                            /*!< xPSR: V Mask */
+
+#define xPSR_T_Pos                         24U                                            /*!< xPSR: T Position */
+#define xPSR_T_Msk                         (1UL << xPSR_T_Pos)                            /*!< xPSR: T Mask */
+
+#define xPSR_ISR_Pos                        0U                                            /*!< xPSR: ISR Position */
+#define xPSR_ISR_Msk                       (0x1FFUL /*<< xPSR_ISR_Pos*/)                  /*!< xPSR: ISR Mask */
+
+
+/**
+  \brief  Union type to access the Control Registers (CONTROL).
+ */
+typedef union
+{
+  struct
+  {
+    uint32_t _reserved0:1;               /*!< bit:      0  Reserved */
+    uint32_t SPSEL:1;                    /*!< bit:      1  Stack to be used */
+    uint32_t _reserved1:30;              /*!< bit:  2..31  Reserved */
+  } b;                                   /*!< Structure used for bit  access */
+  uint32_t w;                            /*!< Type      used for word access */
+} CONTROL_Type;
+
+/* CONTROL Register Definitions */
+#define CONTROL_SPSEL_Pos                   1U                                            /*!< CONTROL: SPSEL Position */
+#define CONTROL_SPSEL_Msk                  (1UL << CONTROL_SPSEL_Pos)                     /*!< CONTROL: SPSEL Mask */
+
+/*@} end of group CMSIS_CORE */
+
+
+/**
+  \ingroup    CMSIS_core_register
+  \defgroup   CMSIS_NVIC  Nested Vectored Interrupt Controller (NVIC)
+  \brief      Type definitions for the NVIC Registers
+  @{
+ */
+
+/**
+  \brief  Structure type to access the Nested Vectored Interrupt Controller (NVIC).
+ */
+typedef struct
+{
+  __IOM uint32_t ISER[1U];               /*!< Offset: 0x000 (R/W)  Interrupt Set Enable Register */
+        uint32_t RESERVED0[31U];
+  __IOM uint32_t ICER[1U];               /*!< Offset: 0x080 (R/W)  Interrupt Clear Enable Register */
+        uint32_t RSERVED1[31U];
+  __IOM uint32_t ISPR[1U];               /*!< Offset: 0x100 (R/W)  Interrupt Set Pending Register */
+        uint32_t RESERVED2[31U];
+  __IOM uint32_t ICPR[1U];               /*!< Offset: 0x180 (R/W)  Interrupt Clear Pending Register */
+        uint32_t RESERVED3[31U];
+        uint32_t RESERVED4[64U];
+  __IOM uint32_t IP[8U];                 /*!< Offset: 0x300 (R/W)  Interrupt Priority Register */
+}  NVIC_Type;
+
+/*@} end of group CMSIS_NVIC */
+
+
+/**
+  \ingroup  CMSIS_core_register
+  \defgroup CMSIS_SCB     System Control Block (SCB)
+  \brief    Type definitions for the System Control Block Registers
+  @{
+ */
+
+/**
+  \brief  Structure type to access the System Control Block (SCB).
+ */
+typedef struct
+{
+  __IM  uint32_t CPUID;                  /*!< Offset: 0x000 (R/ )  CPUID Base Register */
+  __IOM uint32_t ICSR;                   /*!< Offset: 0x004 (R/W)  Interrupt Control and State Register */
+        uint32_t RESERVED0;
+  __IOM uint32_t AIRCR;                  /*!< Offset: 0x00C (R/W)  Application Interrupt and Reset Control Register */
+  __IOM uint32_t SCR;                    /*!< Offset: 0x010 (R/W)  System Control Register */
+  __IOM uint32_t CCR;                    /*!< Offset: 0x014 (R/W)  Configuration Control Register */
+        uint32_t RESERVED1;
+  __IOM uint32_t SHP[2U];                /*!< Offset: 0x01C (R/W)  System Handlers Priority Registers. [0] is RESERVED */
+  __IOM uint32_t SHCSR;                  /*!< Offset: 0x024 (R/W)  System Handler Control and State Register */
+} SCB_Type;
+
+/* SCB CPUID Register Definitions */
+#define SCB_CPUID_IMPLEMENTER_Pos          24U                                            /*!< SCB CPUID: IMPLEMENTER Position */
+#define SCB_CPUID_IMPLEMENTER_Msk          (0xFFUL << SCB_CPUID_IMPLEMENTER_Pos)          /*!< SCB CPUID: IMPLEMENTER Mask */
+
+#define SCB_CPUID_VARIANT_Pos              20U                                            /*!< SCB CPUID: VARIANT Position */
+#define SCB_CPUID_VARIANT_Msk              (0xFUL << SCB_CPUID_VARIANT_Pos)               /*!< SCB CPUID: VARIANT Mask */
+
+#define SCB_CPUID_ARCHITECTURE_Pos         16U                                            /*!< SCB CPUID: ARCHITECTURE Position */
+#define SCB_CPUID_ARCHITECTURE_Msk         (0xFUL << SCB_CPUID_ARCHITECTURE_Pos)          /*!< SCB CPUID: ARCHITECTURE Mask */
+
+#define SCB_CPUID_PARTNO_Pos                4U                                            /*!< SCB CPUID: PARTNO Position */
+#define SCB_CPUID_PARTNO_Msk               (0xFFFUL << SCB_CPUID_PARTNO_Pos)              /*!< SCB CPUID: PARTNO Mask */
+
+#define SCB_CPUID_REVISION_Pos              0U                                            /*!< SCB CPUID: REVISION Position */
+#define SCB_CPUID_REVISION_Msk             (0xFUL /*<< SCB_CPUID_REVISION_Pos*/)          /*!< SCB CPUID: REVISION Mask */
+
+/* SCB Interrupt Control State Register Definitions */
+#define SCB_ICSR_NMIPENDSET_Pos            31U                                            /*!< SCB ICSR: NMIPENDSET Position */
+#define SCB_ICSR_NMIPENDSET_Msk            (1UL << SCB_ICSR_NMIPENDSET_Pos)               /*!< SCB ICSR: NMIPENDSET Mask */
+
+#define SCB_ICSR_PENDSVSET_Pos             28U                                            /*!< SCB ICSR: PENDSVSET Position */
+#define SCB_ICSR_PENDSVSET_Msk             (1UL << SCB_ICSR_PENDSVSET_Pos)                /*!< SCB ICSR: PENDSVSET Mask */
+
+#define SCB_ICSR_PENDSVCLR_Pos             27U                                            /*!< SCB ICSR: PENDSVCLR Position */
+#define SCB_ICSR_PENDSVCLR_Msk             (1UL << SCB_ICSR_PENDSVCLR_Pos)                /*!< SCB ICSR: PENDSVCLR Mask */
+
+#define SCB_ICSR_PENDSTSET_Pos             26U                                            /*!< SCB ICSR: PENDSTSET Position */
+#define SCB_ICSR_PENDSTSET_Msk             (1UL << SCB_ICSR_PENDSTSET_Pos)                /*!< SCB ICSR: PENDSTSET Mask */
+
+#define SCB_ICSR_PENDSTCLR_Pos             25U                                            /*!< SCB ICSR: PENDSTCLR Position */
+#define SCB_ICSR_PENDSTCLR_Msk             (1UL << SCB_ICSR_PENDSTCLR_Pos)                /*!< SCB ICSR: PENDSTCLR Mask */
+
+#define SCB_ICSR_ISRPREEMPT_Pos            23U                                            /*!< SCB ICSR: ISRPREEMPT Position */
+#define SCB_ICSR_ISRPREEMPT_Msk            (1UL << SCB_ICSR_ISRPREEMPT_Pos)               /*!< SCB ICSR: ISRPREEMPT Mask */
+
+#define SCB_ICSR_ISRPENDING_Pos            22U                                            /*!< SCB ICSR: ISRPENDING Position */
+#define SCB_ICSR_ISRPENDING_Msk            (1UL << SCB_ICSR_ISRPENDING_Pos)               /*!< SCB ICSR: ISRPENDING Mask */
+
+#define SCB_ICSR_VECTPENDING_Pos           12U                                            /*!< SCB ICSR: VECTPENDING Position */
+#define SCB_ICSR_VECTPENDING_Msk           (0x1FFUL << SCB_ICSR_VECTPENDING_Pos)          /*!< SCB ICSR: VECTPENDING Mask */
+
+#define SCB_ICSR_VECTACTIVE_Pos             0U                                            /*!< SCB ICSR: VECTACTIVE Position */
+#define SCB_ICSR_VECTACTIVE_Msk            (0x1FFUL /*<< SCB_ICSR_VECTACTIVE_Pos*/)       /*!< SCB ICSR: VECTACTIVE Mask */
+
+/* SCB Application Interrupt and Reset Control Register Definitions */
+#define SCB_AIRCR_VECTKEY_Pos              16U                                            /*!< SCB AIRCR: VECTKEY Position */
+#define SCB_AIRCR_VECTKEY_Msk              (0xFFFFUL << SCB_AIRCR_VECTKEY_Pos)            /*!< SCB AIRCR: VECTKEY Mask */
+
+#define SCB_AIRCR_VECTKEYSTAT_Pos          16U                                            /*!< SCB AIRCR: VECTKEYSTAT Position */
+#define SCB_AIRCR_VECTKEYSTAT_Msk          (0xFFFFUL << SCB_AIRCR_VECTKEYSTAT_Pos)        /*!< SCB AIRCR: VECTKEYSTAT Mask */
+
+#define SCB_AIRCR_ENDIANESS_Pos            15U                                            /*!< SCB AIRCR: ENDIANESS Position */
+#define SCB_AIRCR_ENDIANESS_Msk            (1UL << SCB_AIRCR_ENDIANESS_Pos)               /*!< SCB AIRCR: ENDIANESS Mask */
+
+#define SCB_AIRCR_SYSRESETREQ_Pos           2U                                            /*!< SCB AIRCR: SYSRESETREQ Position */
+#define SCB_AIRCR_SYSRESETREQ_Msk          (1UL << SCB_AIRCR_SYSRESETREQ_Pos)             /*!< SCB AIRCR: SYSRESETREQ Mask */
+
+#define SCB_AIRCR_VECTCLRACTIVE_Pos         1U                                            /*!< SCB AIRCR: VECTCLRACTIVE Position */
+#define SCB_AIRCR_VECTCLRACTIVE_Msk        (1UL << SCB_AIRCR_VECTCLRACTIVE_Pos)           /*!< SCB AIRCR: VECTCLRACTIVE Mask */
+
+/* SCB System Control Register Definitions */
+#define SCB_SCR_SEVONPEND_Pos               4U                                            /*!< SCB SCR: SEVONPEND Position */
+#define SCB_SCR_SEVONPEND_Msk              (1UL << SCB_SCR_SEVONPEND_Pos)                 /*!< SCB SCR: SEVONPEND Mask */
+
+#define SCB_SCR_SLEEPDEEP_Pos               2U                                            /*!< SCB SCR: SLEEPDEEP Position */
+#define SCB_SCR_SLEEPDEEP_Msk              (1UL << SCB_SCR_SLEEPDEEP_Pos)                 /*!< SCB SCR: SLEEPDEEP Mask */
+
+#define SCB_SCR_SLEEPONEXIT_Pos             1U                                            /*!< SCB SCR: SLEEPONEXIT Position */
+#define SCB_SCR_SLEEPONEXIT_Msk            (1UL << SCB_SCR_SLEEPONEXIT_Pos)               /*!< SCB SCR: SLEEPONEXIT Mask */
+
+/* SCB Configuration Control Register Definitions */
+#define SCB_CCR_STKALIGN_Pos                9U                                            /*!< SCB CCR: STKALIGN Position */
+#define SCB_CCR_STKALIGN_Msk               (1UL << SCB_CCR_STKALIGN_Pos)                  /*!< SCB CCR: STKALIGN Mask */
+
+#define SCB_CCR_UNALIGN_TRP_Pos             3U                                            /*!< SCB CCR: UNALIGN_TRP Position */
+#define SCB_CCR_UNALIGN_TRP_Msk            (1UL << SCB_CCR_UNALIGN_TRP_Pos)               /*!< SCB CCR: UNALIGN_TRP Mask */
+
+/* SCB System Handler Control and State Register Definitions */
+#define SCB_SHCSR_SVCALLPENDED_Pos         15U                                            /*!< SCB SHCSR: SVCALLPENDED Position */
+#define SCB_SHCSR_SVCALLPENDED_Msk         (1UL << SCB_SHCSR_SVCALLPENDED_Pos)            /*!< SCB SHCSR: SVCALLPENDED Mask */
+
+/*@} end of group CMSIS_SCB */
+
+
+/**
+  \ingroup  CMSIS_core_register
+  \defgroup CMSIS_SysTick     System Tick Timer (SysTick)
+  \brief    Type definitions for the System Timer Registers.
+  @{
+ */
+
+/**
+  \brief  Structure type to access the System Timer (SysTick).
+ */
+typedef struct
+{
+  __IOM uint32_t CTRL;                   /*!< Offset: 0x000 (R/W)  SysTick Control and Status Register */
+  __IOM uint32_t LOAD;                   /*!< Offset: 0x004 (R/W)  SysTick Reload Value Register */
+  __IOM uint32_t VAL;                    /*!< Offset: 0x008 (R/W)  SysTick Current Value Register */
+  __IM  uint32_t CALIB;                  /*!< Offset: 0x00C (R/ )  SysTick Calibration Register */
+} SysTick_Type;
+
+/* SysTick Control / Status Register Definitions */
+#define SysTick_CTRL_COUNTFLAG_Pos         16U                                            /*!< SysTick CTRL: COUNTFLAG Position */
+#define SysTick_CTRL_COUNTFLAG_Msk         (1UL << SysTick_CTRL_COUNTFLAG_Pos)            /*!< SysTick CTRL: COUNTFLAG Mask */
+
+#define SysTick_CTRL_CLKSOURCE_Pos          2U                                            /*!< SysTick CTRL: CLKSOURCE Position */
+#define SysTick_CTRL_CLKSOURCE_Msk         (1UL << SysTick_CTRL_CLKSOURCE_Pos)            /*!< SysTick CTRL: CLKSOURCE Mask */
+
+#define SysTick_CTRL_TICKINT_Pos            1U                                            /*!< SysTick CTRL: TICKINT Position */
+#define SysTick_CTRL_TICKINT_Msk           (1UL << SysTick_CTRL_TICKINT_Pos)              /*!< SysTick CTRL: TICKINT Mask */
+
+#define SysTick_CTRL_ENABLE_Pos             0U                                            /*!< SysTick CTRL: ENABLE Position */
+#define SysTick_CTRL_ENABLE_Msk            (1UL /*<< SysTick_CTRL_ENABLE_Pos*/)           /*!< SysTick CTRL: ENABLE Mask */
+
+/* SysTick Reload Register Definitions */
+#define SysTick_LOAD_RELOAD_Pos             0U                                            /*!< SysTick LOAD: RELOAD Position */
+#define SysTick_LOAD_RELOAD_Msk            (0xFFFFFFUL /*<< SysTick_LOAD_RELOAD_Pos*/)    /*!< SysTick LOAD: RELOAD Mask */
+
+/* SysTick Current Register Definitions */
+#define SysTick_VAL_CURRENT_Pos             0U                                            /*!< SysTick VAL: CURRENT Position */
+#define SysTick_VAL_CURRENT_Msk            (0xFFFFFFUL /*<< SysTick_VAL_CURRENT_Pos*/)    /*!< SysTick VAL: CURRENT Mask */
+
+/* SysTick Calibration Register Definitions */
+#define SysTick_CALIB_NOREF_Pos            31U                                            /*!< SysTick CALIB: NOREF Position */
+#define SysTick_CALIB_NOREF_Msk            (1UL << SysTick_CALIB_NOREF_Pos)               /*!< SysTick CALIB: NOREF Mask */
+
+#define SysTick_CALIB_SKEW_Pos             30U                                            /*!< SysTick CALIB: SKEW Position */
+#define SysTick_CALIB_SKEW_Msk             (1UL << SysTick_CALIB_SKEW_Pos)                /*!< SysTick CALIB: SKEW Mask */
+
+#define SysTick_CALIB_TENMS_Pos             0U                                            /*!< SysTick CALIB: TENMS Position */
+#define SysTick_CALIB_TENMS_Msk            (0xFFFFFFUL /*<< SysTick_CALIB_TENMS_Pos*/)    /*!< SysTick CALIB: TENMS Mask */
+
+/*@} end of group CMSIS_SysTick */
+
+
+/**
+  \ingroup  CMSIS_core_register
+  \defgroup CMSIS_CoreDebug       Core Debug Registers (CoreDebug)
+  \brief    Cortex-M0 Core Debug Registers (DCB registers, SHCSR, and DFSR) are only accessible over DAP and not via processor.
+            Therefore they are not covered by the Cortex-M0 header file.
+  @{
+ */
+/*@} end of group CMSIS_CoreDebug */
+
+
+/**
+  \ingroup    CMSIS_core_register
+  \defgroup   CMSIS_core_bitfield     Core register bit field macros
+  \brief      Macros for use with bit field definitions (xxx_Pos, xxx_Msk).
+  @{
+ */
+
+/**
+  \brief   Mask and shift a bit field value for use in a register bit range.
+  \param[in] field  Name of the register bit field.
+  \param[in] value  Value of the bit field. This parameter is interpreted as an uint32_t type.
+  \return           Masked and shifted value.
+*/
+#define _VAL2FLD(field, value)    (((uint32_t)(value) << field ## _Pos) & field ## _Msk)
+
+/**
+  \brief     Mask and shift a register value to extract a bit filed value.
+  \param[in] field  Name of the register bit field.
+  \param[in] value  Value of register. This parameter is interpreted as an uint32_t type.
+  \return           Masked and shifted bit field value.
+*/
+#define _FLD2VAL(field, value)    (((uint32_t)(value) & field ## _Msk) >> field ## _Pos)
+
+/*@} end of group CMSIS_core_bitfield */
+
+
+/**
+  \ingroup    CMSIS_core_register
+  \defgroup   CMSIS_core_base     Core Definitions
+  \brief      Definitions for base addresses, unions, and structures.
+  @{
+ */
+
+/* Memory mapping of Core Hardware */
+#define SCS_BASE            (0xE000E000UL)                            /*!< System Control Space Base Address */
+#define SysTick_BASE        (SCS_BASE +  0x0010UL)                    /*!< SysTick Base Address */
+#define NVIC_BASE           (SCS_BASE +  0x0100UL)                    /*!< NVIC Base Address */
+#define SCB_BASE            (SCS_BASE +  0x0D00UL)                    /*!< System Control Block Base Address */
+
+#define SCB                 ((SCB_Type       *)     SCB_BASE      )   /*!< SCB configuration struct */
+#define SysTick             ((SysTick_Type   *)     SysTick_BASE  )   /*!< SysTick configuration struct */
+#define NVIC                ((NVIC_Type      *)     NVIC_BASE     )   /*!< NVIC configuration struct */
+
+
+/*@} */
+
+
+
+/*******************************************************************************
+ *                Hardware Abstraction Layer
+  Core Function Interface contains:
+  - Core NVIC Functions
+  - Core SysTick Functions
+  - Core Register Access Functions
+ ******************************************************************************/
+/**
+  \defgroup CMSIS_Core_FunctionInterface Functions and Instructions Reference
+*/
+
+
+
+/* ##########################   NVIC functions  #################################### */
+/**
+  \ingroup  CMSIS_Core_FunctionInterface
+  \defgroup CMSIS_Core_NVICFunctions NVIC Functions
+  \brief    Functions that manage interrupts and exceptions via the NVIC.
+  @{
+ */
+
+#ifdef CMSIS_NVIC_VIRTUAL
+  #ifndef CMSIS_NVIC_VIRTUAL_HEADER_FILE
+    #define CMSIS_NVIC_VIRTUAL_HEADER_FILE "cmsis_nvic_virtual.h"
+  #endif
+  #include CMSIS_NVIC_VIRTUAL_HEADER_FILE
+#else
+/*#define NVIC_SetPriorityGrouping    __NVIC_SetPriorityGrouping   not available for Cortex-M0 */
+/*#define NVIC_GetPriorityGrouping    __NVIC_GetPriorityGrouping   not available for Cortex-M0 */
+  #define NVIC_EnableIRQ              __NVIC_EnableIRQ
+  #define NVIC_GetEnableIRQ           __NVIC_GetEnableIRQ
+  #define NVIC_DisableIRQ             __NVIC_DisableIRQ
+  #define NVIC_GetPendingIRQ          __NVIC_GetPendingIRQ
+  #define NVIC_SetPendingIRQ          __NVIC_SetPendingIRQ
+  #define NVIC_ClearPendingIRQ        __NVIC_ClearPendingIRQ
+/*#define NVIC_GetActive              __NVIC_GetActive             not available for Cortex-M0 */
+  #define NVIC_SetPriority            __NVIC_SetPriority
+  #define NVIC_GetPriority            __NVIC_GetPriority
+  #define NVIC_SystemReset            __NVIC_SystemReset
+#endif /* CMSIS_NVIC_VIRTUAL */
+
+#ifdef CMSIS_VECTAB_VIRTUAL
+  #ifndef CMSIS_VECTAB_VIRTUAL_HEADER_FILE
+    #define CMSIS_VECTAB_VIRTUAL_HEADER_FILE "cmsis_vectab_virtual.h"
+  #endif
+  #include CMSIS_VECTAB_VIRTUAL_HEADER_FILE
+#else
+  #define NVIC_SetVector              __NVIC_SetVector
+  #define NVIC_GetVector              __NVIC_GetVector
+#endif  /* (CMSIS_VECTAB_VIRTUAL) */
+
+#define NVIC_USER_IRQ_OFFSET          16
+
+
+/* Interrupt Priorities are WORD accessible only under Armv6-M                  */
+/* The following MACROS handle generation of the register offset and byte masks */
+#define _BIT_SHIFT(IRQn)         (  ((((uint32_t)(int32_t)(IRQn))         )      &  0x03UL) * 8UL)
+#define _SHP_IDX(IRQn)           ( (((((uint32_t)(int32_t)(IRQn)) & 0x0FUL)-8UL) >>    2UL)      )
+#define _IP_IDX(IRQn)            (   (((uint32_t)(int32_t)(IRQn))                >>    2UL)      )
+
+
+/**
+  \brief   Enable Interrupt
+  \details Enables a device specific interrupt in the NVIC interrupt controller.
+  \param [in]      IRQn  Device specific interrupt number.
+  \note    IRQn must not be negative.
+ */
+__STATIC_INLINE void __NVIC_EnableIRQ(IRQn_Type IRQn)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    NVIC->ISER[0U] = (uint32_t)(1UL << (((uint32_t)IRQn) & 0x1FUL));
+  }
+}
+
+
+/**
+  \brief   Get Interrupt Enable status
+  \details Returns a device specific interrupt enable status from the NVIC interrupt controller.
+  \param [in]      IRQn  Device specific interrupt number.
+  \return             0  Interrupt is not enabled.
+  \return             1  Interrupt is enabled.
+  \note    IRQn must not be negative.
+ */
+__STATIC_INLINE uint32_t __NVIC_GetEnableIRQ(IRQn_Type IRQn)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    return((uint32_t)(((NVIC->ISER[0U] & (1UL << (((uint32_t)IRQn) & 0x1FUL))) != 0UL) ? 1UL : 0UL));
+  }
+  else
+  {
+    return(0U);
+  }
+}
+
+
+/**
+  \brief   Disable Interrupt
+  \details Disables a device specific interrupt in the NVIC interrupt controller.
+  \param [in]      IRQn  Device specific interrupt number.
+  \note    IRQn must not be negative.
+ */
+__STATIC_INLINE void __NVIC_DisableIRQ(IRQn_Type IRQn)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    NVIC->ICER[0U] = (uint32_t)(1UL << (((uint32_t)IRQn) & 0x1FUL));
+    __DSB();
+    __ISB();
+  }
+}
+
+
+/**
+  \brief   Get Pending Interrupt
+  \details Reads the NVIC pending register and returns the pending bit for the specified device specific interrupt.
+  \param [in]      IRQn  Device specific interrupt number.
+  \return             0  Interrupt status is not pending.
+  \return             1  Interrupt status is pending.
+  \note    IRQn must not be negative.
+ */
+__STATIC_INLINE uint32_t __NVIC_GetPendingIRQ(IRQn_Type IRQn)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    return((uint32_t)(((NVIC->ISPR[0U] & (1UL << (((uint32_t)IRQn) & 0x1FUL))) != 0UL) ? 1UL : 0UL));
+  }
+  else
+  {
+    return(0U);
+  }
+}
+
+
+/**
+  \brief   Set Pending Interrupt
+  \details Sets the pending bit of a device specific interrupt in the NVIC pending register.
+  \param [in]      IRQn  Device specific interrupt number.
+  \note    IRQn must not be negative.
+ */
+__STATIC_INLINE void __NVIC_SetPendingIRQ(IRQn_Type IRQn)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    NVIC->ISPR[0U] = (uint32_t)(1UL << (((uint32_t)IRQn) & 0x1FUL));
+  }
+}
+
+
+/**
+  \brief   Clear Pending Interrupt
+  \details Clears the pending bit of a device specific interrupt in the NVIC pending register.
+  \param [in]      IRQn  Device specific interrupt number.
+  \note    IRQn must not be negative.
+ */
+__STATIC_INLINE void __NVIC_ClearPendingIRQ(IRQn_Type IRQn)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    NVIC->ICPR[0U] = (uint32_t)(1UL << (((uint32_t)IRQn) & 0x1FUL));
+  }
+}
+
+
+/**
+  \brief   Set Interrupt Priority
+  \details Sets the priority of a device specific interrupt or a processor exception.
+           The interrupt number can be positive to specify a device specific interrupt,
+           or negative to specify a processor exception.
+  \param [in]      IRQn  Interrupt number.
+  \param [in]  priority  Priority to set.
+  \note    The priority cannot be set for every processor exception.
+ */
+__STATIC_INLINE void __NVIC_SetPriority(IRQn_Type IRQn, uint32_t priority)
+{
+  if ((int32_t)(IRQn) >= 0)
+  {
+    NVIC->IP[_IP_IDX(IRQn)]  = ((uint32_t)(NVIC->IP[_IP_IDX(IRQn)]  & ~(0xFFUL << _BIT_SHIFT(IRQn))) |
+       (((priority << (8U - __NVIC_PRIO_BITS)) & (uint32_t)0xFFUL) << _BIT_SHIFT(IRQn)));
+  }
+  else
+  {
+    SCB->SHP[_SHP_IDX(IRQn)] = ((uint32_t)(SCB->SHP[_SHP_IDX(IRQn)] & ~(0xFFUL << _BIT_SHIFT(IRQn))) |
+       (((priority << (8U - __NVIC_PRIO_BITS)) & (uint32_t)0xFFUL) << _BIT_SHIFT(IRQn)));
+  }
+}
+
+
+/**
+  \brief   Get Interrupt Priority
+  \details Reads the priority of a device specific interrupt or a processor exception.
+           The interrupt number can be positive to specify a device specific interrupt,
+           or negative to specify a processor exception.
+  \param [in]   IRQn  Interrupt number.
+  \return             Interrupt Priority.
+                      Value is aligned automatically to the implemented priority bits of the microcontroller.
+ */
+__STATIC_INLINE uint32_t __NVIC_GetPriority(IRQn_Type IRQn)
+{
+
+  if ((int32_t)(IRQn) >= 0)
+  {
+    return((uint32_t)(((NVIC->IP[ _IP_IDX(IRQn)] >> _BIT_SHIFT(IRQn) ) & (uint32_t)0xFFUL) >> (8U - __NVIC_PRIO_BITS)));
+  }
+  else
+  {
+    return((uint32_t)(((SCB->SHP[_SHP_IDX(IRQn)] >> _BIT_SHIFT(IRQn) ) & (uint32_t)0xFFUL) >> (8U - __NVIC_PRIO_BITS)));
+  }
+}
+
+
+/**
+  \brief   Set Interrupt Vector
+  \details Sets an interrupt vector in SRAM based interrupt vector table.
+           The interrupt number can be positive to specify a device specific interrupt,
+           or negative to specify a processor exception.
+           Address 0 must be mapped to SRAM.
+  \param [in]   IRQn      Interrupt number
+  \param [in]   vector    Address of interrupt handler function
+ */
+__STATIC_INLINE void __NVIC_SetVector(IRQn_Type IRQn, uint32_t vector)
+{
+  uint32_t *vectors = (uint32_t *)0x0U;
+  vectors[(int32_t)IRQn + NVIC_USER_IRQ_OFFSET] = vector;
+}
+
+
+/**
+  \brief   Get Interrupt Vector
+  \details Reads an interrupt vector from interrupt vector table.
+           The interrupt number can be positive to specify a device specific interrupt,
+           or negative to specify a processor exception.
+  \param [in]   IRQn      Interrupt number.
+  \return                 Address of interrupt handler function
+ */
+__STATIC_INLINE uint32_t __NVIC_GetVector(IRQn_Type IRQn)
+{
+  uint32_t *vectors = (uint32_t *)0x0U;
+  return vectors[(int32_t)IRQn + NVIC_USER_IRQ_OFFSET];
+}
+
+
+/**
+  \brief   System Reset
+  \details Initiates a system reset request to reset the MCU.
+ */
+__STATIC_INLINE void __NVIC_SystemReset(void)
+{
+  __DSB();                                                          /* Ensure all outstanding memory accesses included
+                                                                       buffered write are completed before reset */
+  SCB->AIRCR  = ((0x5FAUL << SCB_AIRCR_VECTKEY_Pos) |
+                 SCB_AIRCR_SYSRESETREQ_Msk);
+  __DSB();                                                          /* Ensure completion of memory access */
+
+  for(;;)                                                           /* wait until reset */
+  {
+    __NOP();
+  }
+}
+
+/*@} end of CMSIS_Core_NVICFunctions */
+
+
+/* ##########################  FPU functions  #################################### */
+/**
+  \ingroup  CMSIS_Core_FunctionInterface
+  \defgroup CMSIS_Core_FpuFunctions FPU Functions
+  \brief    Function that provides FPU type.
+  @{
+ */
+
+/**
+  \brief   get FPU type
+  \details returns the FPU type
+  \returns
+   - \b  0: No FPU
+   - \b  1: Single precision FPU
+   - \b  2: Double + Single precision FPU
+ */
+__STATIC_INLINE uint32_t SCB_GetFPUType(void)
+{
+    return 0U;           /* No FPU */
+}
+
+
+/*@} end of CMSIS_Core_FpuFunctions */
+
+
+
+/* ##################################    SysTick function  ############################################ */
+/**
+  \ingroup  CMSIS_Core_FunctionInterface
+  \defgroup CMSIS_Core_SysTickFunctions SysTick Functions
+  \brief    Functions that configure the System.
+  @{
+ */
+
+#if defined (__Vendor_SysTickConfig) && (__Vendor_SysTickConfig == 0U)
+
+/**
+  \brief   System Tick Configuration
+  \details Initializes the System Timer and its interrupt, and starts the System Tick Timer.
+           Counter is in free running mode to generate periodic interrupts.
+  \param [in]  ticks  Number of ticks between two interrupts.
+  \return          0  Function succeeded.
+  \return          1  Function failed.
+  \note    When the variable <b>__Vendor_SysTickConfig</b> is set to 1, then the
+           function <b>SysTick_Config</b> is not included. In this case, the file <b><i>device</i>.h</b>
+           must contain a vendor-specific implementation of this function.
+ */
+__STATIC_INLINE uint32_t SysTick_Config(uint32_t ticks)
+{
+  if ((ticks - 1UL) > SysTick_LOAD_RELOAD_Msk)
+  {
+    return (1UL);                                                   /* Reload value impossible */
+  }
+
+  SysTick->LOAD  = (uint32_t)(ticks - 1UL);                         /* set reload register */
+  NVIC_SetPriority (SysTick_IRQn, (1UL << __NVIC_PRIO_BITS) - 1UL); /* set Priority for Systick Interrupt */
+  SysTick->VAL   = 0UL;                                             /* Load the SysTick Counter Value */
+  SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk |
+                   SysTick_CTRL_TICKINT_Msk   |
+                   SysTick_CTRL_ENABLE_Msk;                         /* Enable SysTick IRQ and SysTick Timer */
+  return (0UL);                                                     /* Function successful */
+}
+
+#endif
+
+/*@} end of CMSIS_Core_SysTickFunctions */
+
+
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* __CORE_CM0_H_DEPENDANT */
+
+#endif /* __CMSIS_GENERIC */

lib/cmsis-core/mpu_armv7.h

@@ -0,0 +1,197 @@
+/******************************************************************************
+ * @file     mpu_armv7.h
+ * @brief    CMSIS MPU API for Armv7-M MPU
+ * @version  V5.0.4
+ * @date     10. January 2018
+ ******************************************************************************/
+/*
+ * Copyright (c) 2017-2018 Arm Limited. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+ 
+#if   defined ( __ICCARM__ )
+  #pragma system_include         /* treat file as system include file for MISRA check */
+#elif defined (__clang__)
+  #pragma clang system_header    /* treat file as system include file */
+#endif
+ 
+#ifndef ARM_MPU_ARMV7_H
+#define ARM_MPU_ARMV7_H
+
+#define ARM_MPU_REGION_SIZE_32B      ((uint8_t)0x04U)
+#define ARM_MPU_REGION_SIZE_64B      ((uint8_t)0x05U)
+#define ARM_MPU_REGION_SIZE_128B     ((uint8_t)0x06U)
+#define ARM_MPU_REGION_SIZE_256B     ((uint8_t)0x07U)
+#define ARM_MPU_REGION_SIZE_512B     ((uint8_t)0x08U)
+#define ARM_MPU_REGION_SIZE_1KB      ((uint8_t)0x09U)
+#define ARM_MPU_REGION_SIZE_2KB      ((uint8_t)0x0AU)
+#define ARM_MPU_REGION_SIZE_4KB      ((uint8_t)0x0BU)
+#define ARM_MPU_REGION_SIZE_8KB      ((uint8_t)0x0CU)
+#define ARM_MPU_REGION_SIZE_16KB     ((uint8_t)0x0DU)
+#define ARM_MPU_REGION_SIZE_32KB     ((uint8_t)0x0EU)
+#define ARM_MPU_REGION_SIZE_64KB     ((uint8_t)0x0FU)
+#define ARM_MPU_REGION_SIZE_128KB    ((uint8_t)0x10U)
+#define ARM_MPU_REGION_SIZE_256KB    ((uint8_t)0x11U)
+#define ARM_MPU_REGION_SIZE_512KB    ((uint8_t)0x12U)
+#define ARM_MPU_REGION_SIZE_1MB      ((uint8_t)0x13U)
+#define ARM_MPU_REGION_SIZE_2MB      ((uint8_t)0x14U)
+#define ARM_MPU_REGION_SIZE_4MB      ((uint8_t)0x15U)
+#define ARM_MPU_REGION_SIZE_8MB      ((uint8_t)0x16U)
+#define ARM_MPU_REGION_SIZE_16MB     ((uint8_t)0x17U)
+#define ARM_MPU_REGION_SIZE_32MB     ((uint8_t)0x18U)
+#define ARM_MPU_REGION_SIZE_64MB     ((uint8_t)0x19U)
+#define ARM_MPU_REGION_SIZE_128MB    ((uint8_t)0x1AU)
+#define ARM_MPU_REGION_SIZE_256MB    ((uint8_t)0x1BU)
+#define ARM_MPU_REGION_SIZE_512MB    ((uint8_t)0x1CU)
+#define ARM_MPU_REGION_SIZE_1GB      ((uint8_t)0x1DU)
+#define ARM_MPU_REGION_SIZE_2GB      ((uint8_t)0x1EU)
+#define ARM_MPU_REGION_SIZE_4GB      ((uint8_t)0x1FU)
+
+#define ARM_MPU_AP_NONE 0U 
+#define ARM_MPU_AP_PRIV 1U
+#define ARM_MPU_AP_URO  2U
+#define ARM_MPU_AP_FULL 3U
+#define ARM_MPU_AP_PRO  5U
+#define ARM_MPU_AP_RO   6U
+
+/** MPU Region Base Address Register Value
+*
+* \param Region The region to be configured, number 0 to 15.
+* \param BaseAddress The base address for the region.
+*/
+#define ARM_MPU_RBAR(Region, BaseAddress) \
+  (((BaseAddress) & MPU_RBAR_ADDR_Msk) |  \
+   ((Region) & MPU_RBAR_REGION_Msk)    |  \
+   (MPU_RBAR_VALID_Msk))
+
+/**
+* MPU Region Attribute and Size Register Value
+* 
+* \param DisableExec       Instruction access disable bit, 1= disable instruction fetches.
+* \param AccessPermission  Data access permissions, allows you to configure read/write access for User and Privileged mode.
+* \param TypeExtField      Type extension field, allows you to configure memory access type, for example strongly ordered, peripheral.
+* \param IsShareable       Region is shareable between multiple bus masters.
+* \param IsCacheable       Region is cacheable, i.e. its value may be kept in cache.
+* \param IsBufferable      Region is bufferable, i.e. using write-back caching. Cacheable but non-bufferable regions use write-through policy.
+* \param SubRegionDisable  Sub-region disable field.
+* \param Size              Region size of the region to be configured, for example 4K, 8K.
+*/                         
+#define ARM_MPU_RASR(DisableExec, AccessPermission, TypeExtField, IsShareable, IsCacheable, IsBufferable, SubRegionDisable, Size) \
+  ((((DisableExec     ) << MPU_RASR_XN_Pos)     & MPU_RASR_XN_Msk)     | \
+   (((AccessPermission) << MPU_RASR_AP_Pos)     & MPU_RASR_AP_Msk)     | \
+   (((TypeExtField    ) << MPU_RASR_TEX_Pos)    & MPU_RASR_TEX_Msk)    | \
+   (((IsShareable     ) << MPU_RASR_S_Pos)      & MPU_RASR_S_Msk)      | \
+   (((IsCacheable     ) << MPU_RASR_C_Pos)      & MPU_RASR_C_Msk)      | \
+   (((IsBufferable    ) << MPU_RASR_B_Pos)      & MPU_RASR_B_Msk)      | \
+   (((SubRegionDisable) << MPU_RASR_SRD_Pos)    & MPU_RASR_SRD_Msk)    | \
+   (((Size            ) << MPU_RASR_SIZE_Pos)   & MPU_RASR_SIZE_Msk)   | \
+   (MPU_RASR_ENABLE_Msk))
+
+
+/**
+* Struct for a single MPU Region
+*/
+typedef struct {
+  uint32_t RBAR; //!< The region base address register value (RBAR)
+  uint32_t RASR; //!< The region attribute and size register value (RASR) \ref MPU_RASR
+} ARM_MPU_Region_t;
+    
+/** Enable the MPU.
+* \param MPU_Control Default access permissions for unconfigured regions.
+*/
+__STATIC_INLINE void ARM_MPU_Enable(uint32_t MPU_Control)
+{
+  __DSB();
+  __ISB();
+  MPU->CTRL = MPU_Control | MPU_CTRL_ENABLE_Msk;
+#ifdef SCB_SHCSR_MEMFAULTENA_Msk
+  SCB->SHCSR |= SCB_SHCSR_MEMFAULTENA_Msk;
+#endif
+}
+
+/** Disable the MPU.
+*/
+__STATIC_INLINE void ARM_MPU_Disable(void)
+{
+  __DSB();
+  __ISB();
+#ifdef SCB_SHCSR_MEMFAULTENA_Msk
+  SCB->SHCSR &= ~SCB_SHCSR_MEMFAULTENA_Msk;
+#endif
+  MPU->CTRL  &= ~MPU_CTRL_ENABLE_Msk;
+}
+
+/** Clear and disable the given MPU region.
+* \param rnr Region number to be cleared.
+*/
+__STATIC_INLINE void ARM_MPU_ClrRegion(uint32_t rnr)
+{
+  MPU->RNR = rnr;
+  MPU->RASR = 0U;
+}
+
+/** Configure an MPU region.
+* \param rbar Value for RBAR register.
+* \param rsar Value for RSAR register.
+*/   
+__STATIC_INLINE void ARM_MPU_SetRegion(uint32_t rbar, uint32_t rasr)
+{
+  MPU->RBAR = rbar;
+  MPU->RASR = rasr;
+}
+
+/** Configure the given MPU region.
+* \param rnr Region number to be configured.
+* \param rbar Value for RBAR register.
+* \param rsar Value for RSAR register.
+*/   
+__STATIC_INLINE void ARM_MPU_SetRegionEx(uint32_t rnr, uint32_t rbar, uint32_t rasr)
+{
+  MPU->RNR = rnr;
+  MPU->RBAR = rbar;
+  MPU->RASR = rasr;
+}
+
+/** Memcopy with strictly ordered memory access, e.g. for register targets.
+* \param dst Destination data is copied to.
+* \param src Source data is copied from.
+* \param len Amount of data words to be copied.
+*/
+__STATIC_INLINE void orderedCpy(volatile uint32_t* dst, const uint32_t* __RESTRICT src, uint32_t len)
+{
+  uint32_t i;
+  for (i = 0U; i < len; ++i) 
+  {
+    dst[i] = src[i];
+  }
+}
+
+/** Load the given number of MPU regions from a table.
+* \param table Pointer to the MPU configuration table.
+* \param cnt Amount of regions to be configured.
+*/
+__STATIC_INLINE void ARM_MPU_Load(ARM_MPU_Region_t const* table, uint32_t cnt) 
+{
+  const uint32_t rowWordSize = sizeof(ARM_MPU_Region_t)/4U;
+  while (cnt > MPU_TYPE_RALIASES) {
+    orderedCpy(&(MPU->RBAR), &(table->RBAR), MPU_TYPE_RALIASES*rowWordSize);
+    table += MPU_TYPE_RALIASES;
+    cnt -= MPU_TYPE_RALIASES;
+  }
+  orderedCpy(&(MPU->RBAR), &(table->RBAR), cnt*rowWordSize);
+}
+
+#endif

lib/fast-hash/fasthash.c

@@ -0,0 +1,75 @@
+/* The MIT License
+
+   Copyright (C) 2012 Zilong Tan (eric.zltan@gmail.com)
+
+   Permission is hereby granted, free of charge, to any person
+   obtaining a copy of this software and associated documentation
+   files (the "Software"), to deal in the Software without
+   restriction, including without limitation the rights to use, copy,
+   modify, merge, publish, distribute, sublicense, and/or sell copies
+   of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be
+   included in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+   SOFTWARE.
+*/
+
+#include "fasthash.h"
+
+// Compression function for Merkle-Damgard construction.
+// This function is generated using the framework provided.
+#define mix(h) ({					\
+			(h) ^= (h) >> 23;		\
+			(h) *= 0x2127599bf4325c37ULL;	\
+			(h) ^= (h) >> 47; })
+
+uint64_t fasthash64(const void *buf, size_t len, uint64_t seed)
+{
+	const uint64_t    m = 0x880355f21e6d1965ULL;
+	const uint64_t *pos = (const uint64_t *)buf;
+	const uint64_t *end = pos + (len / 8);
+	const unsigned char *pos2;
+	uint64_t h = seed ^ (len * m);
+	uint64_t v;
+
+	while (pos != end) {
+		v  = *pos++;
+		h ^= mix(v);
+		h *= m;
+	}
+
+	pos2 = (const unsigned char*)pos;
+	v = 0;
+
+	switch (len & 7) {
+	case 7: v ^= (uint64_t)pos2[6] << 48;
+	case 6: v ^= (uint64_t)pos2[5] << 40;
+	case 5: v ^= (uint64_t)pos2[4] << 32;
+	case 4: v ^= (uint64_t)pos2[3] << 24;
+	case 3: v ^= (uint64_t)pos2[2] << 16;
+	case 2: v ^= (uint64_t)pos2[1] << 8;
+	case 1: v ^= (uint64_t)pos2[0];
+		h ^= mix(v);
+		h *= m;
+	}
+
+	return mix(h);
+} 
+
+uint32_t fasthash32(const void *buf, size_t len, uint32_t seed)
+{
+	// the following trick converts the 64-bit hashcode to Fermat
+	// residue, which shall retain information from both the higher
+	// and lower parts of hashcode.
+        uint64_t h = fasthash64(buf, len, seed);
+	return h - (h >> 32);
+}

lib/fast-hash/fasthash.h

@@ -0,0 +1,56 @@
+/* The MIT License
+
+   Copyright (C) 2012 Zilong Tan (eric.zltan@gmail.com)
+
+   Permission is hereby granted, free of charge, to any person
+   obtaining a copy of this software and associated documentation
+   files (the "Software"), to deal in the Software without
+   restriction, including without limitation the rights to use, copy,
+   modify, merge, publish, distribute, sublicense, and/or sell copies
+   of the Software, and to permit persons to whom the Software is
+   furnished to do so, subject to the following conditions:
+
+   The above copyright notice and this permission notice shall be
+   included in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+   BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+   ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+   CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+   SOFTWARE.
+*/
+
+#ifndef _FASTHASH_H
+#define _FASTHASH_H
+
+#include <stdint.h>
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * fasthash32 - 32-bit implementation of fasthash
+ * @buf:  data buffer
+ * @len:  data size
+ * @seed: the seed
+ */
+	uint32_t fasthash32(const void *buf, size_t len, uint32_t seed);
+
+/**
+ * fasthash64 - 64-bit implementation of fasthash
+ * @buf:  data buffer
+ * @len:  data size
+ * @seed: the seed
+ */
+	uint64_t fasthash64(const void *buf, size_t len, uint64_t seed);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif

lib/kconfiglib/LICENSE.txt

@@ -0,0 +1,5 @@
+Copyright (c) 2011-2019, Ulf Magnusson <ulfalizer@gmail.com>
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

lib/kconfiglib/genconfig.py

@@ -0,0 +1,154 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2018-2019, Ulf Magnusson
+# SPDX-License-Identifier: ISC
+
+"""
+Generates a header file with #defines from the configuration, matching the
+format of include/generated/autoconf.h in the Linux kernel.
+
+Optionally, also writes the configuration output as a .config file. See
+--config-out.
+
+The --sync-deps, --file-list, and --env-list options generate information that
+can be used to avoid needless rebuilds/reconfigurations.
+
+Before writing a header or configuration file, Kconfiglib compares the old
+contents of the file against the new contents. If there's no change, the write
+is skipped. This avoids updating file metadata like the modification time, and
+might save work depending on your build setup.
+
+By default, the configuration is generated from '.config'. A different
+configuration file can be passed in the KCONFIG_CONFIG environment variable.
+
+A custom header string can be inserted at the beginning of generated
+configuration and header files by setting the KCONFIG_CONFIG_HEADER and
+KCONFIG_AUTOHEADER_HEADER environment variables, respectively (this also works
+for other scripts). The string is not automatically made a comment (this is by
+design, to allow anything to be added), and no trailing newline is added, so
+add '/* */', '#', and newlines as appropriate.
+
+See https://www.gnu.org/software/make/manual/make.html#Multi_002dLine for a
+handy way to define multi-line variables in makefiles, for use with custom
+headers. Remember to export the variable to the environment.
+"""
+import argparse
+import os
+import sys
+
+import kconfiglib
+
+
+DEFAULT_SYNC_DEPS_PATH = "deps/"
+
+
+def main():
+    parser = argparse.ArgumentParser(
+        formatter_class=argparse.RawDescriptionHelpFormatter,
+        description=__doc__)
+
+    parser.add_argument(
+        "--header-path",
+        metavar="HEADER_FILE",
+        help="""
+Path to write the generated header file to. If not specified, the path in the
+environment variable KCONFIG_AUTOHEADER is used if it is set, and 'config.h'
+otherwise.
+""")
+
+    parser.add_argument(
+        "--config-out",
+        metavar="CONFIG_FILE",
+        help="""
+Write the configuration to CONFIG_FILE. This is useful if you include .config
+files in Makefiles, as the generated configuration file will be a full .config
+file even if .config is outdated. The generated configuration matches what
+olddefconfig would produce. If you use sync-deps, you can include
+deps/auto.conf instead. --config-out is meant for cases where incremental build
+information isn't needed.
+""")
+
+    parser.add_argument(
+        "--sync-deps",
+        metavar="OUTPUT_DIR",
+        nargs="?",
+        const=DEFAULT_SYNC_DEPS_PATH,
+        help="""
+Enable generation of symbol dependency information for incremental builds,
+optionally specifying the output directory (default: {}). See the docstring of
+Kconfig.sync_deps() in Kconfiglib for more information.
+""".format(DEFAULT_SYNC_DEPS_PATH))
+
+    parser.add_argument(
+        "--file-list",
+        metavar="OUTPUT_FILE",
+        help="""
+Write a list of all Kconfig files to OUTPUT_FILE, with one file per line. The
+paths are relative to $srctree (or to the current directory if $srctree is
+unset). Files appear in the order they're 'source'd.
+""")
+
+    parser.add_argument(
+        "--env-list",
+        metavar="OUTPUT_FILE",
+        help="""
+Write a list of all environment variables referenced in Kconfig files to
+OUTPUT_FILE, with one variable per line. Each line has the format NAME=VALUE.
+Only environment variables referenced with the preprocessor $(VAR) syntax are
+included, and not variables referenced with the older $VAR syntax (which is
+only supported for backwards compatibility).
+""")
+
+    parser.add_argument(
+        "kconfig",
+        metavar="KCONFIG",
+        nargs="?",
+        default="Kconfig",
+        help="Top-level Kconfig file (default: Kconfig)")
+
+    args = parser.parse_args()
+
+
+    kconf = kconfiglib.Kconfig(args.kconfig, suppress_traceback=True)
+    kconf.load_config()
+
+    if args.header_path is None:
+        if "KCONFIG_AUTOHEADER" in os.environ:
+            kconf.write_autoconf()
+        else:
+            # Kconfiglib defaults to include/generated/autoconf.h to be
+            # compatible with the C tools. 'config.h' is used here instead for
+            # backwards compatibility. It's probably a saner default for tools
+            # as well.
+            kconf.write_autoconf("config.h")
+    else:
+        kconf.write_autoconf(args.header_path)
+
+    if args.config_out is not None:
+        kconf.write_config(args.config_out, save_old=False)
+
+    if args.sync_deps is not None:
+        kconf.sync_deps(args.sync_deps)
+
+    if args.file_list is not None:
+        with _open_write(args.file_list) as f:
+            for path in kconf.kconfig_filenames:
+                f.write(path + "\n")
+
+    if args.env_list is not None:
+        with _open_write(args.env_list) as f:
+            for env_var in kconf.env_vars:
+                f.write("{}={}\n".format(env_var, os.environ[env_var]))
+
+
+def _open_write(path):
+    # Python 2/3 compatibility. io.open() is available on both, but makes
+    # write() expect 'unicode' strings on Python 2.
+
+    if sys.version_info[0] < 3:
+        return open(path, "w")
+    return open(path, "w", encoding="utf-8")
+
+
+if __name__ == "__main__":
+    main()

lib/kconfiglib/kconfiglib.patch

@@ -0,0 +1,147 @@
+diff --git a/lib/kconfiglib/kconfiglib.py b/lib/kconfiglib/kconfiglib.py
+index c67895ce..fb5e4b76 100644
+--- a/lib/kconfiglib/kconfiglib.py
++++ b/lib/kconfiglib/kconfiglib.py
+@@ -1475,8 +1475,8 @@ class Kconfig(object):
+             # instead, to avoid accessing the internal _write_to_conf variable
+             # (though it's likely to keep working).
+             val = sym.str_value
+-            if not sym._write_to_conf:
+-                continue
++            #if not sym._write_to_conf:
++            #    continue
+ 
+             if sym.orig_type in _BOOL_TRISTATE:
+                 if val == "y":
+@@ -1485,6 +1485,9 @@ class Kconfig(object):
+                 elif val == "m":
+                     add("#define {}{}_MODULE 1\n"
+                         .format(self.config_prefix, sym.name))
++                else:
++                    add("#define {}{} 0\n"
++                        .format(self.config_prefix, sym.name))
+ 
+             elif sym.orig_type is STRING:
+                 add('#define {}{} "{}"\n'
+@@ -1494,6 +1497,8 @@ class Kconfig(object):
+                 if sym.orig_type is HEX and \
+                    not val.startswith(("0x", "0X")):
+                     val = "0x" + val
++                if not val:
++                    val = "0"
+ 
+                 add("#define {}{} {}\n"
+                     .format(self.config_prefix, sym.name, val))
+diff --git a/lib/kconfiglib/menuconfig.py b/lib/kconfiglib/menuconfig.py
+index 7e765d36..900d88a1 100755
+--- a/lib/kconfiglib/menuconfig.py
++++ b/lib/kconfiglib/menuconfig.py
+@@ -259,10 +259,8 @@ _N_SCROLL_ARROWS = 14
+ 
+ # Lines of help text shown at the bottom of the "main" display
+ _MAIN_HELP_LINES = """
+-[Space/Enter] Toggle/enter  [ESC] Leave menu           [S] Save
+-[O] Load                    [?] Symbol info            [/] Jump to symbol
+-[F] Toggle show-help mode   [C] Toggle show-name mode  [A] Toggle show-all mode
+-[Q] Quit (prompts for save) [D] Save minimal config (advanced)
++[Space/Enter] Toggle/enter      [?] Help            [/] Search
++[Q] Quit (prompts for save)     [ESC] Leave menu
+ """[1:-1].split("\n")
+ 
+ # Lines of help text shown at the bottom of the information dialog
+@@ -890,17 +888,17 @@ def _menuconfig(stdscr):
+             else:
+                 _leave_menu()
+ 
+-        elif c in ("o", "O"):
++        elif 0 and c in ("o", "O"):
+             _load_dialog()
+ 
+-        elif c in ("s", "S"):
++        elif 0 and c in ("s", "S"):
+             filename = _save_dialog(_kconf.write_config, _conf_filename,
+                                     "configuration")
+             if filename:
+                 _conf_filename = filename
+                 _conf_changed = False
+ 
+-        elif c in ("d", "D"):
++        elif 0 and c in ("d", "D"):
+             filename = _save_dialog(_kconf.write_min_config, _minconf_filename,
+                                     "minimal configuration")
+             if filename:
+@@ -918,15 +916,15 @@ def _menuconfig(stdscr):
+             # dialog was open
+             _resize_main()
+ 
+-        elif c in ("f", "F"):
++        elif 0 and c in ("f", "F"):
+             _show_help = not _show_help
+             _set_style(_help_win, "show-help" if _show_help else "help")
+             _resize_main()
+ 
+-        elif c in ("c", "C"):
++        elif 0 and c in ("c", "C"):
+             _show_name = not _show_name
+ 
+-        elif c in ("a", "A"):
++        elif 0 and c in ("a", "A"):
+             _toggle_show_all()
+ 
+         elif c in ("q", "Q"):
+@@ -2552,11 +2550,11 @@ def _info_str(node):
+             _prompt_info(sym) +
+             "Type: {}\n".format(TYPE_TO_STR[sym.type]) +
+             _value_info(sym) +
+-            _help_info(sym) +
+-            _direct_dep_info(sym) +
+-            _defaults_info(sym) +
+-            _select_imply_info(sym) +
+-            _kconfig_def_info(sym)
++            _help_info(sym)
++            #_direct_dep_info(sym) +
++            #_defaults_info(sym) +
++            #_select_imply_info(sym) +
++            #_kconfig_def_info(sym)
+         )
+ 
+     if isinstance(node.item, Choice):
+@@ -2568,10 +2566,10 @@ def _info_str(node):
+             "Type: {}\n".format(TYPE_TO_STR[choice.type]) +
+             'Mode: {}\n'.format(choice.str_value) +
+             _help_info(choice) +
+-            _choice_syms_info(choice) +
+-            _direct_dep_info(choice) +
+-            _defaults_info(choice) +
+-            _kconfig_def_info(choice)
++            _choice_syms_info(choice)
++            #_direct_dep_info(choice) +
++            #_defaults_info(choice) +
++            #_kconfig_def_info(choice)
+         )
+ 
+     return _kconfig_def_info(node)  # node.item in (MENU, COMMENT)
+@@ -2588,10 +2586,12 @@ def _prompt_info(sc):
+     # Returns a string listing the prompts of 'sc' (Symbol or Choice)
+ 
+     s = ""
++    found = []
+ 
+     for node in sc.nodes:
+-        if node.prompt:
++        if node.prompt and node.prompt[0] not in found:
+             s += "Prompt: {}\n".format(node.prompt[0])
++            found.append(node.prompt[0])
+ 
+     return s
+ 
+@@ -2632,6 +2632,9 @@ def _help_info(sc):
+         if node.help is not None:
+             s += "Help:\n\n{}\n\n".format(_indent(node.help, 2))
+ 
++    if s == "\n":
++        s = "\nHelp: (No help available)\n\n"
++
+     return s
+ 
+ 

lib/kconfiglib/olddefconfig.py

@@ -0,0 +1,28 @@
+#!/usr/bin/env python3
+
+# Copyright (c) 2018-2019, Ulf Magnusson
+# SPDX-License-Identifier: ISC
+
+"""
+Updates an old .config file or creates a new one, by filling in default values
+for all new symbols. This is the same as picking the default selection for all
+symbols in oldconfig, or entering the menuconfig interface and immediately
+saving.
+
+The default input/output filename is '.config'. A different filename can be
+passed in the KCONFIG_CONFIG environment variable.
+
+When overwriting a configuration file, the old version is saved to
+<filename>.old (e.g. .config.old).
+"""
+import kconfiglib
+
+
+def main():
+    kconf = kconfiglib.standard_kconfig(__doc__)
+    print(kconf.load_config())
+    print(kconf.write_config())
+
+
+if __name__ == "__main__":
+    main()

lib/stm32f0/include/stm32f0xx.h

@@ -0,0 +1,242 @@
+/**
+  ******************************************************************************
+  * @file    stm32f0xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS STM32F0xx Device Peripheral Access Layer Header File.           
+  *            
+  *          The file is the unique include file that the application programmer
+  *          is using in the C source code, usually in main.c. This file contains:
+  *           - Configuration section that allows to select:
+  *              - The STM32F0xx device used in the target application
+  *              - To use or not the peripheral’s drivers in application code(i.e. 
+  *                code will be based on direct access to peripheral’s registers 
+  *                rather than drivers API), this option is controlled by 
+  *                "#define USE_HAL_DRIVER"
+  *  
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f0xx
+  * @{
+  */
+    
+#ifndef __STM32F0xx_H
+#define __STM32F0xx_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif /* __cplusplus */
+   
+/** @addtogroup Library_configuration_section
+  * @{
+  */
+  
+/**
+  * @brief STM32 Family
+  */
+#if !defined  (STM32F0)
+#define STM32F0
+#endif /* STM32F0 */
+
+/* Uncomment the line below according to the target STM32 device used in your
+   application 
+  */
+
+#if !defined (STM32F030x6) && !defined (STM32F030x8) &&                           \
+    !defined (STM32F031x6) && !defined (STM32F038xx) &&                           \
+    !defined (STM32F042x6) && !defined (STM32F048xx) && !defined (STM32F070x6) && \
+    !defined (STM32F051x8) && !defined (STM32F058xx) &&                           \
+    !defined (STM32F071xB) && !defined (STM32F072xB) && !defined (STM32F078xx) && !defined (STM32F070xB) && \
+    !defined (STM32F091xC) && !defined (STM32F098xx) && !defined (STM32F030xC)
+  /* #define STM32F030x6 */  /*!< STM32F030x4, STM32F030x6 Devices (STM32F030xx microcontrollers where the Flash memory ranges between 16 and 32 Kbytes)              */
+  /* #define STM32F030x8 */  /*!< STM32F030x8 Devices (STM32F030xx microcontrollers where the Flash memory is 64 Kbytes)                                              */
+  /* #define STM32F031x6 */  /*!< STM32F031x4, STM32F031x6 Devices (STM32F031xx microcontrollers where the Flash memory ranges between 16 and 32 Kbytes)              */
+  /* #define STM32F038xx */  /*!< STM32F038xx Devices (STM32F038xx microcontrollers where the Flash memory is 32 Kbytes)                                              */
+  /* #define STM32F042x6 */  /*!< STM32F042x4, STM32F042x6 Devices (STM32F042xx microcontrollers where the Flash memory ranges between 16 and 32 Kbytes)              */
+  /* #define STM32F048x6 */  /*!< STM32F048xx Devices (STM32F042xx microcontrollers where the Flash memory is 32 Kbytes)                                              */
+  /* #define STM32F051x8 */  /*!< STM32F051x4, STM32F051x6, STM32F051x8 Devices (STM32F051xx microcontrollers where the Flash memory ranges between 16 and 64 Kbytes) */
+  /* #define STM32F058xx */  /*!< STM32F058xx Devices (STM32F058xx microcontrollers where the Flash memory is 64 Kbytes)                                              */
+  /* #define STM32F070x6 */  /*!< STM32F070x6 Devices (STM32F070x6 microcontrollers where the Flash memory ranges between 16 and 32 Kbytes)                           */
+  /* #define STM32F070xB */  /*!< STM32F070xB Devices (STM32F070xB microcontrollers where the Flash memory ranges between 64 and 128 Kbytes)                          */
+  /* #define STM32F071xB */  /*!< STM32F071x8, STM32F071xB Devices (STM32F071xx microcontrollers where the Flash memory ranges between 64 and 128 Kbytes)             */
+  /* #define STM32F072xB */  /*!< STM32F072x8, STM32F072xB Devices (STM32F072xx microcontrollers where the Flash memory ranges between 64 and 128 Kbytes)             */
+  /* #define STM32F078xx */  /*!< STM32F078xx Devices (STM32F078xx microcontrollers where the Flash memory is 128 Kbytes)                                             */
+  /* #define STM32F030xC */  /*!< STM32F030xC Devices (STM32F030xC microcontrollers where the Flash memory is 256 Kbytes)                                             */  
+  /* #define STM32F091xC */  /*!< STM32F091xB, STM32F091xC Devices (STM32F091xx microcontrollers where the Flash memory ranges between 128 and 256 Kbytes)            */
+  /* #define STM32F098xx */  /*!< STM32F098xx Devices (STM32F098xx microcontrollers where the Flash memory is 256 Kbytes)                                             */
+#endif
+   
+/*  Tip: To avoid modifying this file each time you need to switch between these
+        devices, you can define the device in your toolchain compiler preprocessor.
+  */
+#if !defined  (USE_HAL_DRIVER)
+/**
+ * @brief Comment the line below if you will not use the peripherals drivers.
+   In this case, these drivers will not be included and the application code will 
+   be based on direct access to peripherals registers 
+   */
+  /*#define USE_HAL_DRIVER */
+#endif /* USE_HAL_DRIVER */
+
+/**
+  * @brief CMSIS Device version number V2.3.3
+  */
+#define __STM32F0_DEVICE_VERSION_MAIN   (0x02) /*!< [31:24] main version */
+#define __STM32F0_DEVICE_VERSION_SUB1   (0x03) /*!< [23:16] sub1 version */
+#define __STM32F0_DEVICE_VERSION_SUB2   (0x03) /*!< [15:8]  sub2 version */
+#define __STM32F0_DEVICE_VERSION_RC     (0x00) /*!< [7:0]  release candidate */ 
+#define __STM32F0_DEVICE_VERSION        ((__STM32F0_DEVICE_VERSION_MAIN << 24)\
+                                        |(__STM32F0_DEVICE_VERSION_SUB1 << 16)\
+                                        |(__STM32F0_DEVICE_VERSION_SUB2 << 8 )\
+                                        |(__STM32F0_DEVICE_VERSION_RC))
+                                             
+/**
+  * @}
+  */
+
+/** @addtogroup Device_Included
+  * @{
+  */
+
+#if defined(STM32F030x6)
+  #include "stm32f030x6.h"
+#elif defined(STM32F030x8)
+  #include "stm32f030x8.h"
+#elif defined(STM32F031x6)
+  #include "stm32f031x6.h"
+#elif defined(STM32F038xx)
+  #include "stm32f038xx.h"
+#elif defined(STM32F042x6)
+  #include "stm32f042x6.h"
+#elif defined(STM32F048xx)
+  #include "stm32f048xx.h"
+#elif defined(STM32F051x8)
+  #include "stm32f051x8.h"
+#elif defined(STM32F058xx)
+  #include "stm32f058xx.h"
+#elif defined(STM32F070x6)
+  #include "stm32f070x6.h"
+#elif defined(STM32F070xB)
+  #include "stm32f070xb.h"
+#elif defined(STM32F071xB)
+  #include "stm32f071xb.h"
+#elif defined(STM32F072xB)
+  #include "stm32f072xb.h"
+#elif defined(STM32F078xx)
+  #include "stm32f078xx.h"
+#elif defined(STM32F091xC)
+  #include "stm32f091xc.h"
+#elif defined(STM32F098xx)
+  #include "stm32f098xx.h"
+#elif defined(STM32F030xC)
+  #include "stm32f030xc.h"    
+#else
+ #error "Please select first the target STM32F0xx device used in your application (in stm32f0xx.h file)"
+#endif
+
+/**
+  * @}
+  */
+
+/** @addtogroup Exported_types
+  * @{
+  */ 
+typedef enum 
+{
+  RESET = 0, 
+  SET = !RESET
+} FlagStatus, ITStatus;
+
+typedef enum 
+{
+  DISABLE = 0, 
+  ENABLE = !DISABLE
+} FunctionalState;
+#define IS_FUNCTIONAL_STATE(STATE) (((STATE) == DISABLE) || ((STATE) == ENABLE))
+
+typedef enum 
+{
+  ERROR = 0, 
+  SUCCESS = !ERROR
+} ErrorStatus;
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup Exported_macros
+  * @{
+  */
+#define SET_BIT(REG, BIT)     ((REG) |= (BIT))
+
+#define CLEAR_BIT(REG, BIT)   ((REG) &= ~(BIT))
+
+#define READ_BIT(REG, BIT)    ((REG) & (BIT))
+
+#define CLEAR_REG(REG)        ((REG) = (0x0))
+
+#define WRITE_REG(REG, VAL)   ((REG) = (VAL))
+
+#define READ_REG(REG)         ((REG))
+
+#define MODIFY_REG(REG, CLEARMASK, SETMASK)  WRITE_REG((REG), (((READ_REG(REG)) & (~(CLEARMASK))) | (SETMASK)))
+
+
+/**
+  * @}
+  */
+
+#if defined (USE_HAL_DRIVER)
+ #include "stm32f0xx_hal.h"
+#endif /* USE_HAL_DRIVER */
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __STM32F0xx_H */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+
+
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f0/include/system_stm32f0xx.h

@@ -0,0 +1,121 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f0xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M0 Device System Source File for STM32F0xx devices.  
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f0xx_system
+  * @{
+  */  
+  
+/**
+  * @brief Define to prevent recursive inclusion
+  */
+#ifndef __SYSTEM_STM32F0XX_H
+#define __SYSTEM_STM32F0XX_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+/** @addtogroup STM32F0xx_System_Includes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup STM32F0xx_System_Exported_types
+  * @{
+  */
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      3) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) by calling HAL API function HAL_RCC_ClockConfig()
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+extern uint32_t SystemCoreClock;          /*!< System Clock Frequency (Core Clock) */
+extern const uint8_t AHBPrescTable[16];   /*!< AHB prescalers table values */
+extern const uint8_t APBPrescTable[8];    /*!< APB prescalers table values */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Exported_Constants
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Exported_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Exported_Functions
+  * @{
+  */
+  
+extern void SystemInit(void);
+extern void SystemCoreClockUpdate(void);
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*__SYSTEM_STM32F0XX_H */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */  
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f0/system_stm32f0xx.c

@@ -0,0 +1,333 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f0xx.c
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M0 Device Peripheral Access Layer System Source File.
+  *
+  * 1. This file provides two functions and one global variable to be called from
+  *    user application:
+  *      - SystemInit(): This function is called at startup just after reset and 
+  *                      before branch to main program. This call is made inside
+  *                      the "startup_stm32f0xx.s" file.
+  *
+  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+  *                                  by the user application to setup the SysTick
+  *                                  timer or configure other parameters.
+  *
+  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+  *                                 be called whenever the core clock is changed
+  *                                 during program execution.
+  *
+  * 2. After each device reset the HSI (8 MHz) is used as system clock source.
+  *    Then SystemInit() function is called, in "startup_stm32f0xx.s" file, to
+  *    configure the system clock before to branch to main program.
+  *
+  * 3. This file configures the system clock as follows:
+  *=============================================================================
+  *                         Supported STM32F0xx device
+  *-----------------------------------------------------------------------------
+  *        System Clock source                    | HSI
+  *-----------------------------------------------------------------------------
+  *        SYSCLK(Hz)                             | 8000000
+  *-----------------------------------------------------------------------------
+  *        HCLK(Hz)                               | 8000000
+  *-----------------------------------------------------------------------------
+  *        AHB Prescaler                          | 1
+  *-----------------------------------------------------------------------------
+  *        APB1 Prescaler                         | 1
+  *-----------------------------------------------------------------------------
+  *=============================================================================
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2016 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f0xx_system
+  * @{
+  */
+
+/** @addtogroup STM32F0xx_System_Private_Includes
+  * @{
+  */
+
+#include "stm32f0xx.h"
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Private_Defines
+  * @{
+  */
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)8000000) /*!< Default value of the External oscillator in Hz.
+                                                This value can be provided and adapted by the user application. */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)8000000) /*!< Default value of the Internal oscillator in Hz.
+                                                This value can be provided and adapted by the user application. */
+#endif /* HSI_VALUE */
+
+#if !defined (HSI48_VALUE)
+#define HSI48_VALUE    ((uint32_t)48000000) /*!< Default value of the HSI48 Internal oscillator in Hz.
+                                                 This value can be provided and adapted by the user application. */
+#endif /* HSI48_VALUE */
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Private_Variables
+  * @{
+  */
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency
+         Note: If you use this function to configure the system clock there is no need to
+               call the 2 first functions listed above, since SystemCoreClock variable is 
+               updated automatically.
+  */
+uint32_t SystemCoreClock = 8000000;
+
+const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Private_FunctionPrototypes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F0xx_System_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Setup the microcontroller system.
+  *         Initialize the default HSI clock source, vector table location and the PLL configuration is reset.
+  * @param  None
+  * @retval None
+  */
+void SystemInit(void)
+{
+  /* Reset the RCC clock configuration to the default reset state ------------*/
+  /* Set HSION bit */
+  RCC->CR |= (uint32_t)0x00000001U;
+
+#if defined (STM32F051x8) || defined (STM32F058x8)
+  /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE and MCOSEL[2:0] bits */
+  RCC->CFGR &= (uint32_t)0xF8FFB80CU;
+#else
+  /* Reset SW[1:0], HPRE[3:0], PPRE[2:0], ADCPRE, MCOSEL[2:0], MCOPRE[2:0] and PLLNODIV bits */
+  RCC->CFGR &= (uint32_t)0x08FFB80CU;
+#endif /* STM32F051x8 or STM32F058x8 */
+  
+  /* Reset HSEON, CSSON and PLLON bits */
+  RCC->CR &= (uint32_t)0xFEF6FFFFU;
+
+  /* Reset HSEBYP bit */
+  RCC->CR &= (uint32_t)0xFFFBFFFFU;
+
+  /* Reset PLLSRC, PLLXTPRE and PLLMUL[3:0] bits */
+  RCC->CFGR &= (uint32_t)0xFFC0FFFFU;
+
+  /* Reset PREDIV[3:0] bits */
+  RCC->CFGR2 &= (uint32_t)0xFFFFFFF0U;
+
+#if defined (STM32F072xB) || defined (STM32F078xx)
+  /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFFCFE2CU;
+#elif defined (STM32F071xB)
+  /* Reset USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFFFCEACU;
+#elif defined (STM32F091xC) || defined (STM32F098xx)
+  /* Reset USART3SW[1:0], USART2SW[1:0], USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFF0FEACU;
+#elif defined (STM32F030x6) || defined (STM32F030x8) || defined (STM32F031x6) || defined (STM32F038xx) || defined (STM32F030xC)
+  /* Reset USART1SW[1:0], I2C1SW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFFFFEECU;
+#elif defined (STM32F051x8) || defined (STM32F058xx)
+  /* Reset USART1SW[1:0], I2C1SW, CECSW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFFFFEACU;
+#elif defined (STM32F042x6) || defined (STM32F048xx)
+  /* Reset USART1SW[1:0], I2C1SW, CECSW, USBSW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFFFFE2CU;
+#elif defined (STM32F070x6) || defined (STM32F070xB)
+  /* Reset USART1SW[1:0], I2C1SW, USBSW and ADCSW bits */
+  RCC->CFGR3 &= (uint32_t)0xFFFFFE6CU;
+  /* Set default USB clock to PLLCLK, since there is no HSI48 */
+  RCC->CFGR3 |= (uint32_t)0x00000080U;  
+#else
+ #warning "No target selected"
+#endif
+
+  /* Reset HSI14 bit */
+  RCC->CR2 &= (uint32_t)0xFFFFFFFEU;
+
+  /* Disable all interrupts */
+  RCC->CIR = 0x00000000U;
+
+}
+
+/**
+   * @brief  Update SystemCoreClock variable according to Clock Register Values.
+  *         The SystemCoreClock variable contains the core clock (HCLK), it can
+  *         be used by the user application to setup the SysTick timer or configure
+  *         other parameters.
+  *
+  * @note   Each time the core clock (HCLK) changes, this function must be called
+  *         to update SystemCoreClock variable value. Otherwise, any configuration
+  *         based on this variable will be incorrect.
+  *
+  * @note   - The system frequency computed by this function is not the real
+  *           frequency in the chip. It is calculated based on the predefined
+  *           constant and the selected clock source:
+  *
+  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
+  *
+  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
+  *
+  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**)
+  *             or HSI_VALUE(*) multiplied/divided by the PLL factors.
+  *
+  *         (*) HSI_VALUE is a constant defined in stm32f0xx_hal.h file (default value
+  *             8 MHz) but the real value may vary depending on the variations
+  *             in voltage and temperature.
+  *
+  *         (**) HSE_VALUE is a constant defined in stm32f0xx_hal.h file (default value
+  *              8 MHz), user has to ensure that HSE_VALUE is same as the real
+  *              frequency of the crystal used. Otherwise, this function may
+  *              have wrong result.
+  *
+  *         - The result of this function could be not correct when using fractional
+  *           value for HSE crystal.
+  *
+  * @param  None
+  * @retval None
+  */
+void SystemCoreClockUpdate (void)
+{
+  uint32_t tmp = 0, pllmull = 0, pllsource = 0, predivfactor = 0;
+
+  /* Get SYSCLK source -------------------------------------------------------*/
+  tmp = RCC->CFGR & RCC_CFGR_SWS;
+
+  switch (tmp)
+  {
+    case RCC_CFGR_SWS_HSI:  /* HSI used as system clock */
+      SystemCoreClock = HSI_VALUE;
+      break;
+    case RCC_CFGR_SWS_HSE:  /* HSE used as system clock */
+      SystemCoreClock = HSE_VALUE;
+      break;
+    case RCC_CFGR_SWS_PLL:  /* PLL used as system clock */
+      /* Get PLL clock source and multiplication factor ----------------------*/
+      pllmull = RCC->CFGR & RCC_CFGR_PLLMUL;
+      pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
+      pllmull = ( pllmull >> 18) + 2;
+      predivfactor = (RCC->CFGR2 & RCC_CFGR2_PREDIV) + 1;
+
+      if (pllsource == RCC_CFGR_PLLSRC_HSE_PREDIV)
+      {
+        /* HSE used as PLL clock source : SystemCoreClock = HSE/PREDIV * PLLMUL */
+        SystemCoreClock = (HSE_VALUE/predivfactor) * pllmull;
+      }
+#if defined(STM32F042x6) || defined(STM32F048xx) || defined(STM32F072xB) || defined(STM32F078xx) || defined(STM32F091xC) || defined(STM32F098xx)
+      else if (pllsource == RCC_CFGR_PLLSRC_HSI48_PREDIV)
+      {
+        /* HSI48 used as PLL clock source : SystemCoreClock = HSI48/PREDIV * PLLMUL */
+        SystemCoreClock = (HSI48_VALUE/predivfactor) * pllmull;
+      }
+#endif /* STM32F042x6 || STM32F048xx || STM32F072xB || STM32F078xx || STM32F091xC || STM32F098xx */
+      else
+      {
+#if defined(STM32F042x6) || defined(STM32F048xx)  || defined(STM32F070x6) \
+ || defined(STM32F078xx) || defined(STM32F071xB)  || defined(STM32F072xB) \
+ || defined(STM32F070xB) || defined(STM32F091xC) || defined(STM32F098xx)  || defined(STM32F030xC)
+        /* HSI used as PLL clock source : SystemCoreClock = HSI/PREDIV * PLLMUL */
+        SystemCoreClock = (HSI_VALUE/predivfactor) * pllmull;
+#else
+        /* HSI used as PLL clock source : SystemCoreClock = HSI/2 * PLLMUL */
+        SystemCoreClock = (HSI_VALUE >> 1) * pllmull;
+#endif /* STM32F042x6 || STM32F048xx || STM32F070x6 || 
+          STM32F071xB || STM32F072xB || STM32F078xx || STM32F070xB ||
+          STM32F091xC || STM32F098xx || STM32F030xC */
+      }
+      break;
+    default: /* HSI used as system clock */
+      SystemCoreClock = HSI_VALUE;
+      break;
+  }
+  /* Compute HCLK clock frequency ----------------*/
+  /* Get HCLK prescaler */
+  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
+  /* HCLK clock frequency */
+  SystemCoreClock >>= tmp;
+}
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
+

lib/stm32f1/include/stm32f1xx.h

@@ -0,0 +1,220 @@
+/**
+  ******************************************************************************
+  * @file    stm32f1xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS STM32F1xx Device Peripheral Access Layer Header File. 
+  *
+  *          The file is the unique include file that the application programmer
+  *          is using in the C source code, usually in main.c. This file contains:
+  *            - Configuration section that allows to select:
+  *              - The STM32F1xx device used in the target application
+  *              - To use or not the peripheral’s drivers in application code(i.e. 
+  *                code will be based on direct access to peripheral’s registers 
+  *                rather than drivers API), this option is controlled by 
+  *                "#define USE_HAL_DRIVER"
+  *  
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f1xx
+  * @{
+  */
+    
+#ifndef __STM32F1XX_H
+#define __STM32F1XX_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif /* __cplusplus */
+  
+/** @addtogroup Library_configuration_section
+  * @{
+  */
+
+/**
+  * @brief STM32 Family
+  */
+#if !defined (STM32F1)
+#define STM32F1
+#endif /* STM32F1 */
+
+/* Uncomment the line below according to the target STM32L device used in your 
+   application 
+  */
+
+#if !defined (STM32F100xB) && !defined (STM32F100xE) && !defined (STM32F101x6) && \
+    !defined (STM32F101xB) && !defined (STM32F101xE) && !defined (STM32F101xG) && !defined (STM32F102x6) && !defined (STM32F102xB) && !defined (STM32F103x6) && \
+    !defined (STM32F103xB) && !defined (STM32F103xE) && !defined (STM32F103xG) && !defined (STM32F105xC) && !defined (STM32F107xC)
+  /* #define STM32F100xB  */   /*!< STM32F100C4, STM32F100R4, STM32F100C6, STM32F100R6, STM32F100C8, STM32F100R8, STM32F100V8, STM32F100CB, STM32F100RB and STM32F100VB */
+  /* #define STM32F100xE */    /*!< STM32F100RC, STM32F100VC, STM32F100ZC, STM32F100RD, STM32F100VD, STM32F100ZD, STM32F100RE, STM32F100VE and STM32F100ZE */
+  /* #define STM32F101x6  */   /*!< STM32F101C4, STM32F101R4, STM32F101T4, STM32F101C6, STM32F101R6 and STM32F101T6 Devices */
+  /* #define STM32F101xB  */   /*!< STM32F101C8, STM32F101R8, STM32F101T8, STM32F101V8, STM32F101CB, STM32F101RB, STM32F101TB and STM32F101VB */
+  /* #define STM32F101xE */    /*!< STM32F101RC, STM32F101VC, STM32F101ZC, STM32F101RD, STM32F101VD, STM32F101ZD, STM32F101RE, STM32F101VE and STM32F101ZE */ 
+  /* #define STM32F101xG  */   /*!< STM32F101RF, STM32F101VF, STM32F101ZF, STM32F101RG, STM32F101VG and STM32F101ZG */
+  /* #define STM32F102x6 */    /*!< STM32F102C4, STM32F102R4, STM32F102C6 and STM32F102R6 */
+  /* #define STM32F102xB  */   /*!< STM32F102C8, STM32F102R8, STM32F102CB and STM32F102RB */
+  /* #define STM32F103x6  */   /*!< STM32F103C4, STM32F103R4, STM32F103T4, STM32F103C6, STM32F103R6 and STM32F103T6 */
+  /* #define STM32F103xB  */   /*!< STM32F103C8, STM32F103R8, STM32F103T8, STM32F103V8, STM32F103CB, STM32F103RB, STM32F103TB and STM32F103VB */
+  /* #define STM32F103xE */    /*!< STM32F103RC, STM32F103VC, STM32F103ZC, STM32F103RD, STM32F103VD, STM32F103ZD, STM32F103RE, STM32F103VE and STM32F103ZE */
+  /* #define STM32F103xG  */   /*!< STM32F103RF, STM32F103VF, STM32F103ZF, STM32F103RG, STM32F103VG and STM32F103ZG */
+  /* #define STM32F105xC */    /*!< STM32F105R8, STM32F105V8, STM32F105RB, STM32F105VB, STM32F105RC and STM32F105VC */
+  /* #define STM32F107xC  */   /*!< STM32F107RB, STM32F107VB, STM32F107RC and STM32F107VC */  
+#endif
+
+/*  Tip: To avoid modifying this file each time you need to switch between these
+        devices, you can define the device in your toolchain compiler preprocessor.
+  */
+  
+#if !defined  (USE_HAL_DRIVER)
+/**
+ * @brief Comment the line below if you will not use the peripherals drivers.
+   In this case, these drivers will not be included and the application code will 
+   be based on direct access to peripherals registers 
+   */
+  /*#define USE_HAL_DRIVER */
+#endif /* USE_HAL_DRIVER */
+
+/**
+  * @brief CMSIS Device version number V4.3.1
+  */
+#define __STM32F1_CMSIS_VERSION_MAIN   (0x04) /*!< [31:24] main version */
+#define __STM32F1_CMSIS_VERSION_SUB1   (0x03) /*!< [23:16] sub1 version */
+#define __STM32F1_CMSIS_VERSION_SUB2   (0x01) /*!< [15:8]  sub2 version */
+#define __STM32F1_CMSIS_VERSION_RC     (0x00) /*!< [7:0]  release candidate */ 
+#define __STM32F1_CMSIS_VERSION        ((__STM32F1_CMSIS_VERSION_MAIN << 24)\
+                                       |(__STM32F1_CMSIS_VERSION_SUB1 << 16)\
+                                       |(__STM32F1_CMSIS_VERSION_SUB2 << 8 )\
+                                       |(__STM32F1_CMSIS_VERSION_RC))
+
+/**
+  * @}
+  */
+
+/** @addtogroup Device_Included
+  * @{
+  */
+
+#if defined(STM32F100xB)
+  #include "stm32f100xb.h"
+#elif defined(STM32F100xE)
+  #include "stm32f100xe.h"
+#elif defined(STM32F101x6)
+  #include "stm32f101x6.h"
+#elif defined(STM32F101xB)
+  #include "stm32f101xb.h"
+#elif defined(STM32F101xE)
+  #include "stm32f101xe.h"
+#elif defined(STM32F101xG)
+  #include "stm32f101xg.h"
+#elif defined(STM32F102x6)
+  #include "stm32f102x6.h"
+#elif defined(STM32F102xB)
+  #include "stm32f102xb.h"
+#elif defined(STM32F103x6)
+  #include "stm32f103x6.h"
+#elif defined(STM32F103xB)
+  #include "stm32f103xb.h"
+#elif defined(STM32F103xE)
+  #include "stm32f103xe.h"
+#elif defined(STM32F103xG)
+  #include "stm32f103xg.h"
+#elif defined(STM32F105xC)
+  #include "stm32f105xc.h"
+#elif defined(STM32F107xC)
+  #include "stm32f107xc.h"
+#else
+ #error "Please select first the target STM32F1xx device used in your application (in stm32f1xx.h file)"
+#endif
+
+/**
+  * @}
+  */
+
+/** @addtogroup Exported_types
+  * @{
+  */  
+typedef enum 
+{
+  RESET = 0, 
+  SET = !RESET
+} FlagStatus, ITStatus;
+
+typedef enum 
+{
+  DISABLE = 0, 
+  ENABLE = !DISABLE
+} FunctionalState;
+#define IS_FUNCTIONAL_STATE(STATE) (((STATE) == DISABLE) || ((STATE) == ENABLE))
+
+typedef enum
+{
+  SUCCESS = 0U,
+  ERROR = !SUCCESS
+} ErrorStatus;
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup Exported_macros
+  * @{
+  */
+#define SET_BIT(REG, BIT)     ((REG) |= (BIT))
+
+#define CLEAR_BIT(REG, BIT)   ((REG) &= ~(BIT))
+
+#define READ_BIT(REG, BIT)    ((REG) & (BIT))
+
+#define CLEAR_REG(REG)        ((REG) = (0x0))
+
+#define WRITE_REG(REG, VAL)   ((REG) = (VAL))
+
+#define READ_REG(REG)         ((REG))
+
+#define MODIFY_REG(REG, CLEARMASK, SETMASK)  WRITE_REG((REG), (((READ_REG(REG)) & (~(CLEARMASK))) | (SETMASK)))
+
+#define POSITION_VAL(VAL)     (__CLZ(__RBIT(VAL))) 
+
+
+/**
+  * @}
+  */
+
+#if defined (USE_HAL_DRIVER)
+ #include "stm32f1xx_hal.h"
+#endif /* USE_HAL_DRIVER */
+
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __STM32F1xx_H */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+
+
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f1/include/system_stm32f1xx.h

@@ -0,0 +1,98 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f10x.h
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M3 Device Peripheral Access Layer System Header File.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f10x_system
+  * @{
+  */  
+  
+/**
+  * @brief Define to prevent recursive inclusion
+  */
+#ifndef __SYSTEM_STM32F10X_H
+#define __SYSTEM_STM32F10X_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+/** @addtogroup STM32F10x_System_Includes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup STM32F10x_System_Exported_types
+  * @{
+  */
+
+extern uint32_t SystemCoreClock;          /*!< System Clock Frequency (Core Clock) */
+extern const uint8_t  AHBPrescTable[16U];  /*!< AHB prescalers table values */
+extern const uint8_t  APBPrescTable[8U];   /*!< APB prescalers table values */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F10x_System_Exported_Constants
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F10x_System_Exported_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F10x_System_Exported_Functions
+  * @{
+  */
+  
+extern void SystemInit(void);
+extern void SystemCoreClockUpdate(void);
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*__SYSTEM_STM32F10X_H */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */  
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f1/system_stm32f1xx.c

@@ -0,0 +1,430 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f1xx.c
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M3 Device Peripheral Access Layer System Source File.
+  * 
+  * 1.  This file provides two functions and one global variable to be called from 
+  *     user application:
+  *      - SystemInit(): Setups the system clock (System clock source, PLL Multiplier
+  *                      factors, AHB/APBx prescalers and Flash settings). 
+  *                      This function is called at startup just after reset and 
+  *                      before branch to main program. This call is made inside
+  *                      the "startup_stm32f1xx_xx.s" file.
+  *
+  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+  *                                  by the user application to setup the SysTick 
+  *                                  timer or configure other parameters.
+  *                                     
+  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+  *                                 be called whenever the core clock is changed
+  *                                 during program execution.
+  *
+  * 2. After each device reset the HSI (8 MHz) is used as system clock source.
+  *    Then SystemInit() function is called, in "startup_stm32f1xx_xx.s" file, to
+  *    configure the system clock before to branch to main program.
+  *
+  * 4. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depending on
+  *    the product used), refer to "HSE_VALUE". 
+  *    When HSE is used as system clock source, directly or through PLL, and you
+  *    are using different crystal you have to adapt the HSE value to your own
+  *    configuration.
+  *        
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f1xx_system
+  * @{
+  */  
+  
+/** @addtogroup STM32F1xx_System_Private_Includes
+  * @{
+  */
+
+#include "stm32f1xx.h"
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F1xx_System_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F1xx_System_Private_Defines
+  * @{
+  */
+
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE               8000000U /*!< Default value of the External oscillator in Hz.
+                                                This value can be provided and adapted by the user application. */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE               8000000U /*!< Default value of the Internal oscillator in Hz.
+                                                This value can be provided and adapted by the user application. */
+#endif /* HSI_VALUE */
+
+/*!< Uncomment the following line if you need to use external SRAM  */ 
+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
+/* #define DATA_IN_ExtSRAM */
+#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */ 
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET  0x00000000U /*!< Vector Table base offset field. 
+                                  This value must be a multiple of 0x200. */
+
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F1xx_System_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F1xx_System_Private_Variables
+  * @{
+  */
+
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+uint32_t SystemCoreClock = 16000000;
+const uint8_t AHBPrescTable[16U] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+const uint8_t APBPrescTable[8U] =  {0, 0, 0, 0, 1, 2, 3, 4};
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F1xx_System_Private_FunctionPrototypes
+  * @{
+  */
+
+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
+#ifdef DATA_IN_ExtSRAM
+  static void SystemInit_ExtMemCtl(void); 
+#endif /* DATA_IN_ExtSRAM */
+#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F1xx_System_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Setup the microcontroller system
+  *         Initialize the Embedded Flash Interface, the PLL and update the 
+  *         SystemCoreClock variable.
+  * @note   This function should be used only after reset.
+  * @param  None
+  * @retval None
+  */
+void SystemInit (void)
+{
+  /* Reset the RCC clock configuration to the default reset state(for debug purpose) */
+  /* Set HSION bit */
+  RCC->CR |= 0x00000001U;
+
+  /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
+#if !defined(STM32F105xC) && !defined(STM32F107xC)
+  RCC->CFGR &= 0xF8FF0000U;
+#else
+  RCC->CFGR &= 0xF0FF0000U;
+#endif /* STM32F105xC */   
+  
+  /* Reset HSEON, CSSON and PLLON bits */
+  RCC->CR &= 0xFEF6FFFFU;
+
+  /* Reset HSEBYP bit */
+  RCC->CR &= 0xFFFBFFFFU;
+
+  /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
+  RCC->CFGR &= 0xFF80FFFFU;
+
+#if defined(STM32F105xC) || defined(STM32F107xC)
+  /* Reset PLL2ON and PLL3ON bits */
+  RCC->CR &= 0xEBFFFFFFU;
+
+  /* Disable all interrupts and clear pending bits  */
+  RCC->CIR = 0x00FF0000U;
+
+  /* Reset CFGR2 register */
+  RCC->CFGR2 = 0x00000000U;
+#elif defined(STM32F100xB) || defined(STM32F100xE)
+  /* Disable all interrupts and clear pending bits  */
+  RCC->CIR = 0x009F0000U;
+
+  /* Reset CFGR2 register */
+  RCC->CFGR2 = 0x00000000U;      
+#else
+  /* Disable all interrupts and clear pending bits  */
+  RCC->CIR = 0x009F0000U;
+#endif /* STM32F105xC */
+    
+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
+  #ifdef DATA_IN_ExtSRAM
+    SystemInit_ExtMemCtl(); 
+  #endif /* DATA_IN_ExtSRAM */
+#endif 
+
+#ifdef VECT_TAB_SRAM
+  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM. */
+#else
+  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH. */
+#endif 
+}
+
+/**
+  * @brief  Update SystemCoreClock variable according to Clock Register Values.
+  *         The SystemCoreClock variable contains the core clock (HCLK), it can
+  *         be used by the user application to setup the SysTick timer or configure
+  *         other parameters.
+  *           
+  * @note   Each time the core clock (HCLK) changes, this function must be called
+  *         to update SystemCoreClock variable value. Otherwise, any configuration
+  *         based on this variable will be incorrect.         
+  *     
+  * @note   - The system frequency computed by this function is not the real 
+  *           frequency in the chip. It is calculated based on the predefined 
+  *           constant and the selected clock source:
+  *             
+  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
+  *                                              
+  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
+  *                          
+  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) 
+  *             or HSI_VALUE(*) multiplied by the PLL factors.
+  *         
+  *         (*) HSI_VALUE is a constant defined in stm32f1xx.h file (default value
+  *             8 MHz) but the real value may vary depending on the variations
+  *             in voltage and temperature.   
+  *    
+  *         (**) HSE_VALUE is a constant defined in stm32f1xx.h file (default value
+  *              8 MHz or 25 MHz, depending on the product used), user has to ensure
+  *              that HSE_VALUE is same as the real frequency of the crystal used.
+  *              Otherwise, this function may have wrong result.
+  *                
+  *         - The result of this function could be not correct when using fractional
+  *           value for HSE crystal.
+  * @param  None
+  * @retval None
+  */
+void SystemCoreClockUpdate (void)
+{
+  uint32_t tmp = 0U, pllmull = 0U, pllsource = 0U;
+
+#if defined(STM32F105xC) || defined(STM32F107xC)
+  uint32_t prediv1source = 0U, prediv1factor = 0U, prediv2factor = 0U, pll2mull = 0U;
+#endif /* STM32F105xC */
+
+#if defined(STM32F100xB) || defined(STM32F100xE)
+  uint32_t prediv1factor = 0U;
+#endif /* STM32F100xB or STM32F100xE */
+    
+  /* Get SYSCLK source -------------------------------------------------------*/
+  tmp = RCC->CFGR & RCC_CFGR_SWS;
+  
+  switch (tmp)
+  {
+    case 0x00U:  /* HSI used as system clock */
+      SystemCoreClock = HSI_VALUE;
+      break;
+    case 0x04U:  /* HSE used as system clock */
+      SystemCoreClock = HSE_VALUE;
+      break;
+    case 0x08U:  /* PLL used as system clock */
+
+      /* Get PLL clock source and multiplication factor ----------------------*/
+      pllmull = RCC->CFGR & RCC_CFGR_PLLMULL;
+      pllsource = RCC->CFGR & RCC_CFGR_PLLSRC;
+      
+#if !defined(STM32F105xC) && !defined(STM32F107xC)      
+      pllmull = ( pllmull >> 18U) + 2U;
+      
+      if (pllsource == 0x00U)
+      {
+        /* HSI oscillator clock divided by 2 selected as PLL clock entry */
+        SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
+      }
+      else
+      {
+ #if defined(STM32F100xB) || defined(STM32F100xE)
+       prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
+       /* HSE oscillator clock selected as PREDIV1 clock entry */
+       SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull; 
+ #else
+        /* HSE selected as PLL clock entry */
+        if ((RCC->CFGR & RCC_CFGR_PLLXTPRE) != (uint32_t)RESET)
+        {/* HSE oscillator clock divided by 2 */
+          SystemCoreClock = (HSE_VALUE >> 1U) * pllmull;
+        }
+        else
+        {
+          SystemCoreClock = HSE_VALUE * pllmull;
+        }
+ #endif
+      }
+#else
+      pllmull = pllmull >> 18U;
+      
+      if (pllmull != 0x0DU)
+      {
+         pllmull += 2U;
+      }
+      else
+      { /* PLL multiplication factor = PLL input clock * 6.5 */
+        pllmull = 13U / 2U; 
+      }
+            
+      if (pllsource == 0x00U)
+      {
+        /* HSI oscillator clock divided by 2 selected as PLL clock entry */
+        SystemCoreClock = (HSI_VALUE >> 1U) * pllmull;
+      }
+      else
+      {/* PREDIV1 selected as PLL clock entry */
+        
+        /* Get PREDIV1 clock source and division factor */
+        prediv1source = RCC->CFGR2 & RCC_CFGR2_PREDIV1SRC;
+        prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U;
+        
+        if (prediv1source == 0U)
+        { 
+          /* HSE oscillator clock selected as PREDIV1 clock entry */
+          SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull;          
+        }
+        else
+        {/* PLL2 clock selected as PREDIV1 clock entry */
+          
+          /* Get PREDIV2 division factor and PLL2 multiplication factor */
+          prediv2factor = ((RCC->CFGR2 & RCC_CFGR2_PREDIV2) >> 4U) + 1U;
+          pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8U) + 2U; 
+          SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull;                         
+        }
+      }
+#endif /* STM32F105xC */ 
+      break;
+
+    default:
+      SystemCoreClock = HSI_VALUE;
+      break;
+  }
+  
+  /* Compute HCLK clock frequency ----------------*/
+  /* Get HCLK prescaler */
+  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4U)];
+  /* HCLK clock frequency */
+  SystemCoreClock >>= tmp;  
+}
+
+#if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG)
+/**
+  * @brief  Setup the external memory controller. Called in startup_stm32f1xx.s 
+  *          before jump to __main
+  * @param  None
+  * @retval None
+  */ 
+#ifdef DATA_IN_ExtSRAM
+/**
+  * @brief  Setup the external memory controller. 
+  *         Called in startup_stm32f1xx_xx.s/.c before jump to main.
+  *         This function configures the external SRAM mounted on STM3210E-EVAL
+  *         board (STM32 High density devices). This SRAM will be used as program
+  *         data memory (including heap and stack).
+  * @param  None
+  * @retval None
+  */ 
+void SystemInit_ExtMemCtl(void) 
+{
+  __IO uint32_t tmpreg;
+  /*!< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is 
+    required, then adjust the Register Addresses */
+
+  /* Enable FSMC clock */
+  RCC->AHBENR = 0x00000114U;
+
+  /* Delay after an RCC peripheral clock enabling */
+  tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_FSMCEN);
+  
+  /* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */
+  RCC->APB2ENR = 0x000001E0U;
+  
+  /* Delay after an RCC peripheral clock enabling */
+  tmpreg = READ_BIT(RCC->APB2ENR, RCC_APB2ENR_IOPDEN);
+
+  (void)(tmpreg);
+  
+/* ---------------  SRAM Data lines, NOE and NWE configuration ---------------*/
+/*----------------  SRAM Address lines configuration -------------------------*/
+/*----------------  NOE and NWE configuration --------------------------------*/  
+/*----------------  NE3 configuration ----------------------------------------*/
+/*----------------  NBL0, NBL1 configuration ---------------------------------*/
+  
+  GPIOD->CRL = 0x44BB44BBU;  
+  GPIOD->CRH = 0xBBBBBBBBU;
+
+  GPIOE->CRL = 0xB44444BBU;  
+  GPIOE->CRH = 0xBBBBBBBBU;
+
+  GPIOF->CRL = 0x44BBBBBBU;  
+  GPIOF->CRH = 0xBBBB4444U;
+
+  GPIOG->CRL = 0x44BBBBBBU;  
+  GPIOG->CRH = 0x444B4B44U;
+   
+/*----------------  FSMC Configuration ---------------------------------------*/  
+/*----------------  Enable FSMC Bank1_SRAM Bank ------------------------------*/
+  
+  FSMC_Bank1->BTCR[4U] = 0x00001091U;
+  FSMC_Bank1->BTCR[5U] = 0x00110212U;
+}
+#endif /* DATA_IN_ExtSRAM */
+#endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */    
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f2/include/stm32f2xx.h

@@ -0,0 +1,191 @@
+/**
+  ******************************************************************************
+  * @file    stm32f2xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS STM32F2xx Device Peripheral Access Layer Header File. 
+  *
+  *          The file is the unique include file that the application programmer
+  *          is using in the C source code, usually in main.c. This file contains:
+  *           - Configuration section that allows to select:
+  *              - The STM32F2xx device used in the target application
+  *              - To use or not the peripheral’s drivers in application code(i.e. 
+  *                code will be based on direct access to peripheral’s registers 
+  *                rather than drivers API), this option is controlled by 
+  *                "#define USE_HAL_DRIVER"
+  *  
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f2xx
+  * @{
+  */
+    
+#ifndef __STM32F2xx_H
+#define __STM32F2xx_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif /* __cplusplus */
+   
+/** @addtogroup Library_configuration_section
+  * @{
+  */
+
+/**
+  * @brief STM32 Family
+  */
+#if !defined (STM32F2)
+#define STM32F2
+#endif /* STM32F2 */
+   
+/* Uncomment the line below according to the target STM32 device used in your
+   application 
+  */
+#if !defined (STM32F205xx) && !defined (STM32F215xx) && !defined (STM32F207xx) && !defined (STM32F217xx)
+
+  /* #define STM32F205xx */   /*!< STM32F205RG, STM32F205VG, STM32F205ZG, STM32F205RF, STM32F205VF, STM32F205ZF,
+                                   STM32F205RE, STM32F205VE, STM32F205ZE, STM32F205RC, STM32F205VC, STM32F205ZC,
+                                   STM32F205RB and STM32F205VB Devices */
+  /* #define STM32F215xx */   /*!< STM32F215RG, STM32F215VG, STM32F215ZG, STM32F215RE, STM32F215VE and STM32F215ZE Devices */
+  /* #define STM32F207xx */   /*!< STM32F207VG, STM32F207ZG, STM32F207IG, STM32F207VF, STM32F207ZF, STM32F207IF,
+                                   STM32F207VE, STM32F207ZE, STM32F207IE, STM32F207VC, STM32F207ZC and STM32F207IC Devices */
+  /* #define STM32F217xx */   /*!< STM32F217VG, STM32F217ZG, STM32F217IG, STM32F217VE, STM32F217ZE and STM32F217IE Devices */
+    
+#endif
+   
+/*  Tip: To avoid modifying this file each time you need to switch between these
+        devices, you can define the device in your toolchain compiler preprocessor.
+  */
+#if !defined  (USE_HAL_DRIVER)
+/**
+ * @brief Comment the line below if you will not use the peripherals drivers.
+   In this case, these drivers will not be included and the application code will 
+   be based on direct access to peripherals registers 
+   */
+  /*#define USE_HAL_DRIVER */
+#endif /* USE_HAL_DRIVER */
+
+/**
+  * @brief CMSIS Device version number V2.2.3
+  */
+#define __STM32F2xx_CMSIS_VERSION_MAIN   (0x02U) /*!< [31:24] main version */
+#define __STM32F2xx_CMSIS_VERSION_SUB1   (0x02U) /*!< [23:16] sub1 version */
+#define __STM32F2xx_CMSIS_VERSION_SUB2   (0x03U) /*!< [15:8]  sub2 version */
+#define __STM32F2xx_CMSIS_VERSION_RC     (0x00U) /*!< [7:0]  release candidate */
+#define __STM32F2xx_CMSIS_VERSION        ((__STM32F2xx_CMSIS_VERSION_MAIN << 24)\
+                                         |(__STM32F2xx_CMSIS_VERSION_SUB1 << 16)\
+                                         |(__STM32F2xx_CMSIS_VERSION_SUB2 << 8 )\
+                                         |(__STM32F2xx_CMSIS_VERSION))
+
+/**
+  * @}
+  */
+
+/** @addtogroup Device_Included
+  * @{
+  */
+
+#if defined(STM32F205xx)
+  #include "stm32f205xx.h"
+#elif defined(STM32F215xx)
+  #include "stm32f215xx.h"
+#elif defined(STM32F207xx)
+  #include "stm32f207xx.h"
+#elif defined(STM32F217xx)
+  #include "stm32f217xx.h"
+#else
+ #error "Please select first the target STM32F2xx device used in your application (in stm32f2xx.h file)"
+#endif
+
+/**
+  * @}
+  */
+
+/** @addtogroup Exported_types
+  * @{
+  */ 
+typedef enum 
+{
+  RESET = 0U, 
+  SET = !RESET
+} FlagStatus, ITStatus;
+
+typedef enum 
+{
+  DISABLE = 0U, 
+  ENABLE = !DISABLE
+} FunctionalState;
+#define IS_FUNCTIONAL_STATE(STATE) (((STATE) == DISABLE) || ((STATE) == ENABLE))
+
+typedef enum 
+{
+  SUCCESS = 0U,
+  ERROR = !SUCCESS
+} ErrorStatus;
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup Exported_macro
+  * @{
+  */
+#define SET_BIT(REG, BIT)     ((REG) |= (BIT))
+
+#define CLEAR_BIT(REG, BIT)   ((REG) &= ~(BIT))
+
+#define READ_BIT(REG, BIT)    ((REG) & (BIT))
+
+#define CLEAR_REG(REG)        ((REG) = (0x0))
+
+#define WRITE_REG(REG, VAL)   ((REG) = (VAL))
+
+#define READ_REG(REG)         ((REG))
+
+#define MODIFY_REG(REG, CLEARMASK, SETMASK)  WRITE_REG((REG), (((READ_REG(REG)) & (~(CLEARMASK))) | (SETMASK)))
+
+#define POSITION_VAL(VAL)     (__CLZ(__RBIT(VAL))) 
+
+
+/**
+  * @}
+  */
+  
+#if defined (USE_HAL_DRIVER)
+ #include "stm32f2xx_hal.h"
+#endif /* USE_HAL_DRIVER */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __STM32F2xx_H */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+
+
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f2/include/system_stm32f2xx.h

@@ -0,0 +1,106 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f2xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M3 Device System Source File for STM32F2xx devices.
+  ****************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2017 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f2xx_system
+  * @{
+  */  
+  
+/**
+  * @brief Define to prevent recursive inclusion
+  */
+#ifndef __SYSTEM_STM32F2XX_H
+#define __SYSTEM_STM32F2XX_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+/** @addtogroup STM32F2xx_System_Includes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup STM32F2xx_System_Exported_types
+  * @{
+  */
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetSysClockFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+extern uint32_t SystemCoreClock;          /*!< System Clock Frequency (Core Clock) */
+
+extern const uint8_t  AHBPrescTable[16];    /*!< AHB prescalers table values */
+extern const uint8_t  APBPrescTable[8];     /*!< APB prescalers table values */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Exported_Constants
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Exported_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Exported_Functions
+  * @{
+  */
+  
+extern void SystemInit(void);
+extern void SystemCoreClockUpdate(void);
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*__SYSTEM_STM32F2XX_H */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */  
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f2/system_stm32f2xx.c

@@ -0,0 +1,346 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f2xx.c
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M3 Device Peripheral Access Layer System Source File.
+  *             
+  *   This file provides two functions and one global variable to be called from 
+  *   user application:
+  *      - SystemInit(): This function is called at startup just after reset and 
+  *                      before branch to main program. This call is made inside
+  *                      the "startup_stm32f2xx.s" file.
+  *
+  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+  *                                  by the user application to setup the SysTick 
+  *                                  timer or configure other parameters.
+  *                                     
+  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+  *                                 be called whenever the core clock is changed
+  *                                 during program execution.
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; Copyright (c) 2016 STMicroelectronics.
+  * All rights reserved.</center></h2>
+  *
+  * This software component is licensed by ST under BSD 3-Clause license,
+  * the "License"; You may not use this file except in compliance with the
+  * License. You may obtain a copy of the License at:
+  *                        opensource.org/licenses/BSD-3-Clause
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f2xx_system
+  * @{
+  */  
+  
+/** @addtogroup STM32F2xx_System_Private_Includes
+  * @{
+  */
+
+#include "stm32f2xx.h"
+
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)25000000) /*!< Default value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Private_Defines
+  * @{
+  */
+/************************* Miscellaneous Configuration ************************/
+/*!< Uncomment the following line if you need to use external SRAM mounted
+     on STM322xG_EVAL board as data memory  */
+/* #define DATA_IN_ExtSRAM */
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET  0x00 /*!< Vector Table base offset field. 
+                                   This value must be a multiple of 0x200. */
+/******************************************************************************/
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Private_Variables
+  * @{
+  */
+  
+  /* This variable can be updated in Three ways :
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+  uint32_t SystemCoreClock = 16000000;
+  const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+  const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Private_FunctionPrototypes
+  * @{
+  */
+
+#ifdef DATA_IN_ExtSRAM
+  static void SystemInit_ExtMemCtl(void); 
+#endif /* DATA_IN_ExtSRAM */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F2xx_System_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Setup the microcontroller system
+  *         Initialize the Embedded Flash Interface, the PLL and update the 
+  *         SystemFrequency variable.
+  * @param  None
+  * @retval None
+  */
+void SystemInit(void)
+{
+  /* Reset the RCC clock configuration to the default reset state ------------*/
+  /* Set HSION bit */
+  RCC->CR |= (uint32_t)0x00000001;
+
+  /* Reset CFGR register */
+  RCC->CFGR = 0x00000000;
+
+  /* Reset HSEON, CSSON and PLLON bits */
+  RCC->CR &= (uint32_t)0xFEF6FFFF;
+
+  /* Reset PLLCFGR register */
+  RCC->PLLCFGR = 0x24003010;
+
+  /* Reset HSEBYP bit */
+  RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+  /* Disable all interrupts */
+  RCC->CIR = 0x00000000;
+
+#ifdef DATA_IN_ExtSRAM
+  SystemInit_ExtMemCtl(); 
+#endif /* DATA_IN_ExtSRAM */
+
+  /* Configure the Vector Table location add offset address ------------------*/
+#ifdef VECT_TAB_SRAM
+  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+#else
+  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
+#endif
+}
+
+/**
+  * @brief  Update SystemCoreClock variable according to Clock Register Values.
+  *         The SystemCoreClock variable contains the core clock (HCLK), it can
+  *         be used by the user application to setup the SysTick timer or configure
+  *         other parameters.
+  *           
+  * @note   Each time the core clock (HCLK) changes, this function must be called
+  *         to update SystemCoreClock variable value. Otherwise, any configuration
+  *         based on this variable will be incorrect.         
+  *     
+  * @note   - The system frequency computed by this function is not the real 
+  *           frequency in the chip. It is calculated based on the predefined 
+  *           constant and the selected clock source:
+  *             
+  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
+  *                                              
+  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
+  *                          
+  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) 
+  *             or HSI_VALUE(*) multiplied/divided by the PLL factors.
+  *         
+  *         (*) HSI_VALUE is a constant defined in stm32f2xx_hal_conf.h file (default value
+  *             16 MHz) but the real value may vary depending on the variations
+  *             in voltage and temperature.   
+  *    
+  *         (**) HSE_VALUE is a constant defined in stm32f2xx_hal_conf.h file (its value
+  *              depends on the application requirements), user has to ensure that HSE_VALUE
+  *              is same as the real frequency of the crystal used. Otherwise, this function
+  *              may have wrong result.
+  *                
+  *         - The result of this function could be not correct when using fractional
+  *           value for HSE crystal.
+  *     
+  * @param  None
+  * @retval None
+  */
+void SystemCoreClockUpdate(void)
+{
+  uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2;
+  
+  /* Get SYSCLK source -------------------------------------------------------*/
+  tmp = RCC->CFGR & RCC_CFGR_SWS;
+
+  switch (tmp)
+  {
+    case 0x00:  /* HSI used as system clock source */
+      SystemCoreClock = HSI_VALUE;
+      break;
+    case 0x04:  /* HSE used as system clock source */
+      SystemCoreClock = HSE_VALUE;
+      break;
+    case 0x08:  /* PLL used as system clock source */
+
+      /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N
+         SYSCLK = PLL_VCO / PLL_P
+         */    
+      pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22;
+      pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
+      
+      if (pllsource != 0)
+      {
+        /* HSE used as PLL clock source */
+        pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
+      }
+      else
+      {
+        /* HSI used as PLL clock source */
+        pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
+      }
+
+      pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2;
+      SystemCoreClock = pllvco/pllp;
+      break;
+    default:
+      SystemCoreClock = HSI_VALUE;
+      break;
+  }
+  /* Compute HCLK frequency --------------------------------------------------*/
+  /* Get HCLK prescaler */
+  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
+  /* HCLK frequency */
+  SystemCoreClock >>= tmp;
+}
+
+#ifdef DATA_IN_ExtSRAM
+/**
+  * @brief  Setup the external memory controller.
+  *         Called in startup_stm32f2xx.s before jump to main.
+  *         This function configures the external SRAM mounted on STM322xG_EVAL board
+  *         This SRAM will be used as program data memory (including heap and stack).
+  * @param  None
+  * @retval None
+  */
+void SystemInit_ExtMemCtl(void)
+{
+  __IO uint32_t tmp = 0x00;
+
+/*-- GPIOs Configuration -----------------------------------------------------*/
+   /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */
+  RCC->AHB1ENR   |= 0x00000078;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIODEN);
+  (void)(tmp);
+
+  /* Connect PDx pins to FSMC Alternate function */
+  GPIOD->AFR[0]  = 0x00CCC0CC;
+  GPIOD->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xAAAA0A8A;
+  /* Configure PDx pins speed to 100 MHz */  
+  GPIOD->OSPEEDR = 0xFFFF0FCF;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FSMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00CC0CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA828A;
+  /* Configure PEx pins speed to 100 MHz */ 
+  GPIOE->OSPEEDR = 0xFFFFC3CF;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+
+  /* Connect PFx pins to FSMC Alternate function */
+  GPIOF->AFR[0]  = 0x00CCCCCC;
+  GPIOF->AFR[1]  = 0xCCCC0000;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA000AAA;
+  /* Configure PFx pins speed to 100 MHz */ 
+  GPIOF->OSPEEDR = 0xFF000FFF;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FSMC Alternate function */
+  GPIOG->AFR[0]  = 0x00CCCCCC;
+  GPIOG->AFR[1]  = 0x000000C0;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0x00085AAA;
+  /* Configure PGx pins speed to 100 MHz */ 
+  GPIOG->OSPEEDR = 0x000CAFFF;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+  
+/*--FSMC Configuration -------------------------------------------------------*/
+  /* Enable the FSMC interface clock */
+  RCC->AHB3ENR         |= 0x00000001;
+
+  /* Configure and enable Bank1_SRAM2 */
+  FSMC_Bank1->BTCR[2]  = 0x00001011;
+  FSMC_Bank1->BTCR[3]  = 0x00000201;
+  FSMC_Bank1E->BWTR[2] = 0x0FFFFFFF;
+}
+#endif /* DATA_IN_ExtSRAM */
+
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f4/include/stm32f4xx.h

@@ -0,0 +1,269 @@
+/**
+  ******************************************************************************
+  * @file    stm32f4xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS STM32F4xx Device Peripheral Access Layer Header File.
+  *            
+  *          The file is the unique include file that the application programmer
+  *          is using in the C source code, usually in main.c. This file contains:
+  *           - Configuration section that allows to select:
+  *              - The STM32F4xx device used in the target application
+  *              - To use or not the peripheral’s drivers in application code(i.e. 
+  *                code will be based on direct access to peripheral’s registers 
+  *                rather than drivers API), this option is controlled by 
+  *                "#define USE_HAL_DRIVER"
+  *  
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f4xx
+  * @{
+  */
+    
+#ifndef __STM32F4xx_H
+#define __STM32F4xx_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif /* __cplusplus */
+   
+/** @addtogroup Library_configuration_section
+  * @{
+  */
+  
+/**
+  * @brief STM32 Family
+  */
+#if !defined  (STM32F4)
+#define STM32F4
+#endif /* STM32F4 */
+
+/* Uncomment the line below according to the target STM32 device used in your
+   application 
+  */
+#if !defined (STM32F405xx) && !defined (STM32F415xx) && !defined (STM32F407xx) && !defined (STM32F417xx) && \
+    !defined (STM32F427xx) && !defined (STM32F437xx) && !defined (STM32F429xx) && !defined (STM32F439xx) && \
+    !defined (STM32F401xC) && !defined (STM32F401xE) && !defined (STM32F410Tx) && !defined (STM32F410Cx) && \
+    !defined (STM32F410Rx) && !defined (STM32F411xE) && !defined (STM32F446xx) && !defined (STM32F469xx) && \
+    !defined (STM32F479xx) && !defined (STM32F412Cx) && !defined (STM32F412Rx) && !defined (STM32F412Vx) && \
+    !defined (STM32F412Zx) && !defined (STM32F413xx) && !defined (STM32F423xx)
+  /* #define STM32F405xx */   /*!< STM32F405RG, STM32F405VG and STM32F405ZG Devices */
+  /* #define STM32F415xx */   /*!< STM32F415RG, STM32F415VG and STM32F415ZG Devices */
+  /* #define STM32F407xx */   /*!< STM32F407VG, STM32F407VE, STM32F407ZG, STM32F407ZE, STM32F407IG  and STM32F407IE Devices */
+  /* #define STM32F417xx */   /*!< STM32F417VG, STM32F417VE, STM32F417ZG, STM32F417ZE, STM32F417IG and STM32F417IE Devices */
+  /* #define STM32F427xx */   /*!< STM32F427VG, STM32F427VI, STM32F427ZG, STM32F427ZI, STM32F427IG and STM32F427II Devices */
+  /* #define STM32F437xx */   /*!< STM32F437VG, STM32F437VI, STM32F437ZG, STM32F437ZI, STM32F437IG and STM32F437II Devices */
+  /* #define STM32F429xx */   /*!< STM32F429VG, STM32F429VI, STM32F429ZG, STM32F429ZI, STM32F429BG, STM32F429BI, STM32F429NG, 
+                                   STM32F439NI, STM32F429IG  and STM32F429II Devices */
+  /* #define STM32F439xx */   /*!< STM32F439VG, STM32F439VI, STM32F439ZG, STM32F439ZI, STM32F439BG, STM32F439BI, STM32F439NG, 
+                                   STM32F439NI, STM32F439IG and STM32F439II Devices */
+  /* #define STM32F401xC */   /*!< STM32F401CB, STM32F401CC, STM32F401RB, STM32F401RC, STM32F401VB and STM32F401VC Devices */
+  /* #define STM32F401xE */   /*!< STM32F401CD, STM32F401RD, STM32F401VD, STM32F401CE, STM32F401RE and STM32F401VE Devices */
+  /* #define STM32F410Tx */   /*!< STM32F410T8 and STM32F410TB Devices */
+  /* #define STM32F410Cx */   /*!< STM32F410C8 and STM32F410CB Devices */
+  /* #define STM32F410Rx */   /*!< STM32F410R8 and STM32F410RB Devices */
+  /* #define STM32F411xE */   /*!< STM32F411CC, STM32F411RC, STM32F411VC, STM32F411CE, STM32F411RE and STM32F411VE Devices */
+  /* #define STM32F446xx */   /*!< STM32F446MC, STM32F446ME, STM32F446RC, STM32F446RE, STM32F446VC, STM32F446VE, STM32F446ZC, 
+                                   and STM32F446ZE Devices */
+  /* #define STM32F469xx */   /*!< STM32F469AI, STM32F469II, STM32F469BI, STM32F469NI, STM32F469AG, STM32F469IG, STM32F469BG, 
+                                   STM32F469NG, STM32F469AE, STM32F469IE, STM32F469BE and STM32F469NE Devices */
+  /* #define STM32F479xx */   /*!< STM32F479AI, STM32F479II, STM32F479BI, STM32F479NI, STM32F479AG, STM32F479IG, STM32F479BG 
+                                   and STM32F479NG Devices */
+  /* #define STM32F412Cx */   /*!< STM32F412CEU and STM32F412CGU Devices */
+  /* #define STM32F412Zx */   /*!< STM32F412ZET, STM32F412ZGT, STM32F412ZEJ and STM32F412ZGJ Devices */
+  /* #define STM32F412Vx */   /*!< STM32F412VET, STM32F412VGT, STM32F412VEH and STM32F412VGH Devices */
+  /* #define STM32F412Rx */   /*!< STM32F412RET, STM32F412RGT, STM32F412REY and STM32F412RGY Devices */
+  /* #define STM32F413xx */   /*!< STM32F413CH, STM32F413MH, STM32F413RH, STM32F413VH, STM32F413ZH, STM32F413CG, STM32F413MG,
+                                   STM32F413RG, STM32F413VG and STM32F413ZG Devices */
+  /* #define STM32F423xx */   /*!< STM32F423CH, STM32F423RH, STM32F423VH and STM32F423ZH Devices */
+#endif
+   
+/*  Tip: To avoid modifying this file each time you need to switch between these
+        devices, you can define the device in your toolchain compiler preprocessor.
+  */
+#if !defined  (USE_HAL_DRIVER)
+/**
+ * @brief Comment the line below if you will not use the peripherals drivers.
+   In this case, these drivers will not be included and the application code will 
+   be based on direct access to peripherals registers 
+   */
+  /*#define USE_HAL_DRIVER */
+#endif /* USE_HAL_DRIVER */
+
+/**
+  * @brief CMSIS version number V2.6.3
+  */
+#define __STM32F4xx_CMSIS_VERSION_MAIN   (0x02U) /*!< [31:24] main version */
+#define __STM32F4xx_CMSIS_VERSION_SUB1   (0x06U) /*!< [23:16] sub1 version */
+#define __STM32F4xx_CMSIS_VERSION_SUB2   (0x03U) /*!< [15:8]  sub2 version */
+#define __STM32F4xx_CMSIS_VERSION_RC     (0x00U) /*!< [7:0]  release candidate */
+#define __STM32F4xx_CMSIS_VERSION        ((__STM32F4xx_CMSIS_VERSION_MAIN << 24)\
+                                         |(__STM32F4xx_CMSIS_VERSION_SUB1 << 16)\
+                                         |(__STM32F4xx_CMSIS_VERSION_SUB2 << 8 )\
+                                         |(__STM32F4xx_CMSIS_VERSION))
+
+/**
+  * @}
+  */
+
+/** @addtogroup Device_Included
+  * @{
+  */
+
+#if defined(STM32F405xx)
+  #include "stm32f405xx.h"
+#elif defined(STM32F415xx)
+  #include "stm32f415xx.h"
+#elif defined(STM32F407xx)
+  #include "stm32f407xx.h"
+#elif defined(STM32F417xx)
+  #include "stm32f417xx.h"
+#elif defined(STM32F427xx)
+  #include "stm32f427xx.h"
+#elif defined(STM32F437xx)
+  #include "stm32f437xx.h"
+#elif defined(STM32F429xx)
+  #include "stm32f429xx.h"
+#elif defined(STM32F439xx)
+  #include "stm32f439xx.h"
+#elif defined(STM32F401xC)
+  #include "stm32f401xc.h"
+#elif defined(STM32F401xE)
+  #include "stm32f401xe.h"
+#elif defined(STM32F410Tx)
+  #include "stm32f410tx.h"
+#elif defined(STM32F410Cx)
+  #include "stm32f410cx.h"
+#elif defined(STM32F410Rx)
+  #include "stm32f410rx.h"
+#elif defined(STM32F411xE)
+  #include "stm32f411xe.h"
+#elif defined(STM32F446xx)
+  #include "stm32f446xx.h"
+#elif defined(STM32F469xx)
+  #include "stm32f469xx.h"
+#elif defined(STM32F479xx)
+  #include "stm32f479xx.h"
+#elif defined(STM32F412Cx)
+  #include "stm32f412cx.h"
+#elif defined(STM32F412Zx)
+  #include "stm32f412zx.h"
+#elif defined(STM32F412Rx)
+  #include "stm32f412rx.h"
+#elif defined(STM32F412Vx)
+  #include "stm32f412vx.h"
+#elif defined(STM32F413xx)
+  #include "stm32f413xx.h"
+#elif defined(STM32F423xx)
+  #include "stm32f423xx.h"
+#else
+ #error "Please select first the target STM32F4xx device used in your application (in stm32f4xx.h file)"
+#endif
+
+/**
+  * @}
+  */
+
+/** @addtogroup Exported_types
+  * @{
+  */ 
+typedef enum 
+{
+  RESET = 0U, 
+  SET = !RESET
+} FlagStatus, ITStatus;
+
+typedef enum 
+{
+  DISABLE = 0U, 
+  ENABLE = !DISABLE
+} FunctionalState;
+#define IS_FUNCTIONAL_STATE(STATE) (((STATE) == DISABLE) || ((STATE) == ENABLE))
+
+typedef enum
+{
+  SUCCESS = 0U,
+  ERROR = !SUCCESS
+} ErrorStatus;
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup Exported_macro
+  * @{
+  */
+#define SET_BIT(REG, BIT)     ((REG) |= (BIT))
+
+#define CLEAR_BIT(REG, BIT)   ((REG) &= ~(BIT))
+
+#define READ_BIT(REG, BIT)    ((REG) & (BIT))
+
+#define CLEAR_REG(REG)        ((REG) = (0x0))
+
+#define WRITE_REG(REG, VAL)   ((REG) = (VAL))
+
+#define READ_REG(REG)         ((REG))
+
+#define MODIFY_REG(REG, CLEARMASK, SETMASK)  WRITE_REG((REG), (((READ_REG(REG)) & (~(CLEARMASK))) | (SETMASK)))
+
+#define POSITION_VAL(VAL)     (__CLZ(__RBIT(VAL))) 
+
+
+/**
+  * @}
+  */
+
+#if defined (USE_HAL_DRIVER)
+ #include "stm32f4xx_hal.h"
+#endif /* USE_HAL_DRIVER */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
+#endif /* __STM32F4xx_H */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+  
+
+
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f4/include/system_stm32f4xx.h

@@ -0,0 +1,122 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f4xx.h
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M4 Device System Source File for STM32F4xx devices.       
+  ******************************************************************************  
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT(c) 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************  
+  */ 
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f4xx_system
+  * @{
+  */  
+  
+/**
+  * @brief Define to prevent recursive inclusion
+  */
+#ifndef __SYSTEM_STM32F4XX_H
+#define __SYSTEM_STM32F4XX_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif 
+
+/** @addtogroup STM32F4xx_System_Includes
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+
+/** @addtogroup STM32F4xx_System_Exported_types
+  * @{
+  */
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetSysClockFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+extern uint32_t SystemCoreClock;          /*!< System Clock Frequency (Core Clock) */
+
+extern const uint8_t  AHBPrescTable[16];    /*!< AHB prescalers table values */
+extern const uint8_t  APBPrescTable[8];     /*!< APB prescalers table values */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Exported_Constants
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Exported_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Exported_Functions
+  * @{
+  */
+  
+extern void SystemInit(void);
+extern void SystemCoreClockUpdate(void);
+/**
+  * @}
+  */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*__SYSTEM_STM32F4XX_H */
+
+/**
+  * @}
+  */
+  
+/**
+  * @}
+  */  
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

lib/stm32f4/system_stm32f4xx.c

@@ -0,0 +1,761 @@
+/**
+  ******************************************************************************
+  * @file    system_stm32f4xx.c
+  * @author  MCD Application Team
+  * @brief   CMSIS Cortex-M4 Device Peripheral Access Layer System Source File.
+  *
+  *   This file provides two functions and one global variable to be called from 
+  *   user application:
+  *      - SystemInit(): This function is called at startup just after reset and 
+  *                      before branch to main program. This call is made inside
+  *                      the "startup_stm32f4xx.s" file.
+  *
+  *      - SystemCoreClock variable: Contains the core clock (HCLK), it can be used
+  *                                  by the user application to setup the SysTick 
+  *                                  timer or configure other parameters.
+  *                                     
+  *      - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must
+  *                                 be called whenever the core clock is changed
+  *                                 during program execution.
+  *
+  *
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2017 STMicroelectronics</center></h2>
+  *
+  * Redistribution and use in source and binary forms, with or without modification,
+  * are permitted provided that the following conditions are met:
+  *   1. Redistributions of source code must retain the above copyright notice,
+  *      this list of conditions and the following disclaimer.
+  *   2. Redistributions in binary form must reproduce the above copyright notice,
+  *      this list of conditions and the following disclaimer in the documentation
+  *      and/or other materials provided with the distribution.
+  *   3. Neither the name of STMicroelectronics nor the names of its contributors
+  *      may be used to endorse or promote products derived from this software
+  *      without specific prior written permission.
+  *
+  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+  *
+  ******************************************************************************
+  */
+
+/** @addtogroup CMSIS
+  * @{
+  */
+
+/** @addtogroup stm32f4xx_system
+  * @{
+  */  
+  
+/** @addtogroup STM32F4xx_System_Private_Includes
+  * @{
+  */
+
+
+#include "stm32f4xx.h"
+
+#if !defined  (HSE_VALUE) 
+  #define HSE_VALUE    ((uint32_t)25000000) /*!< Default value of the External oscillator in Hz */
+#endif /* HSE_VALUE */
+
+#if !defined  (HSI_VALUE)
+  #define HSI_VALUE    ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/
+#endif /* HSI_VALUE */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_TypesDefinitions
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Defines
+  * @{
+  */
+
+/************************* Miscellaneous Configuration ************************/
+/*!< Uncomment the following line if you need to use external SRAM or SDRAM as data memory  */
+#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx)\
+ || defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx)
+/* #define DATA_IN_ExtSRAM */
+#endif /* STM32F40xxx || STM32F41xxx || STM32F42xxx || STM32F43xxx || STM32F469xx || STM32F479xx ||\
+          STM32F412Zx || STM32F412Vx */
+ 
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx)
+/* #define DATA_IN_ExtSDRAM */
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F446xx || STM32F469xx ||\
+          STM32F479xx */
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+     Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET  0x00 /*!< Vector Table base offset field. 
+                                   This value must be a multiple of 0x200. */
+/******************************************************************************/
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Macros
+  * @{
+  */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Variables
+  * @{
+  */
+  /* This variable is updated in three ways:
+      1) by calling CMSIS function SystemCoreClockUpdate()
+      2) by calling HAL API function HAL_RCC_GetHCLKFreq()
+      3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency 
+         Note: If you use this function to configure the system clock; then there
+               is no need to call the 2 first functions listed above, since SystemCoreClock
+               variable is updated automatically.
+  */
+uint32_t SystemCoreClock = 16000000;
+const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9};
+const uint8_t APBPrescTable[8]  = {0, 0, 0, 0, 1, 2, 3, 4};
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_FunctionPrototypes
+  * @{
+  */
+
+#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+  static void SystemInit_ExtMemCtl(void); 
+#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
+
+/**
+  * @}
+  */
+
+/** @addtogroup STM32F4xx_System_Private_Functions
+  * @{
+  */
+
+/**
+  * @brief  Setup the microcontroller system
+  *         Initialize the FPU setting, vector table location and External memory 
+  *         configuration.
+  * @param  None
+  * @retval None
+  */
+void SystemInit(void)
+{
+  /* FPU settings ------------------------------------------------------------*/
+  #if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
+    SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2));  /* set CP10 and CP11 Full Access */
+  #endif
+  /* Reset the RCC clock configuration to the default reset state ------------*/
+  /* Set HSION bit */
+  RCC->CR |= (uint32_t)0x00000001;
+
+  /* Reset CFGR register */
+  RCC->CFGR = 0x00000000;
+
+  /* Reset HSEON, CSSON and PLLON bits */
+  RCC->CR &= (uint32_t)0xFEF6FFFF;
+
+  /* Reset PLLCFGR register */
+  RCC->PLLCFGR = 0x24003010;
+
+  /* Reset HSEBYP bit */
+  RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+  /* Disable all interrupts */
+  RCC->CIR = 0x00000000;
+
+#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+  SystemInit_ExtMemCtl(); 
+#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
+
+  /* Configure the Vector Table location add offset address ------------------*/
+#ifdef VECT_TAB_SRAM
+  SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+#else
+  SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */
+#endif
+}
+
+/**
+   * @brief  Update SystemCoreClock variable according to Clock Register Values.
+  *         The SystemCoreClock variable contains the core clock (HCLK), it can
+  *         be used by the user application to setup the SysTick timer or configure
+  *         other parameters.
+  *           
+  * @note   Each time the core clock (HCLK) changes, this function must be called
+  *         to update SystemCoreClock variable value. Otherwise, any configuration
+  *         based on this variable will be incorrect.         
+  *     
+  * @note   - The system frequency computed by this function is not the real 
+  *           frequency in the chip. It is calculated based on the predefined 
+  *           constant and the selected clock source:
+  *             
+  *           - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*)
+  *                                              
+  *           - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**)
+  *                          
+  *           - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) 
+  *             or HSI_VALUE(*) multiplied/divided by the PLL factors.
+  *         
+  *         (*) HSI_VALUE is a constant defined in stm32f4xx_hal_conf.h file (default value
+  *             16 MHz) but the real value may vary depending on the variations
+  *             in voltage and temperature.   
+  *    
+  *         (**) HSE_VALUE is a constant defined in stm32f4xx_hal_conf.h file (its value
+  *              depends on the application requirements), user has to ensure that HSE_VALUE
+  *              is same as the real frequency of the crystal used. Otherwise, this function
+  *              may have wrong result.
+  *                
+  *         - The result of this function could be not correct when using fractional
+  *           value for HSE crystal.
+  *     
+  * @param  None
+  * @retval None
+  */
+void SystemCoreClockUpdate(void)
+{
+  uint32_t tmp = 0, pllvco = 0, pllp = 2, pllsource = 0, pllm = 2;
+  
+  /* Get SYSCLK source -------------------------------------------------------*/
+  tmp = RCC->CFGR & RCC_CFGR_SWS;
+
+  switch (tmp)
+  {
+    case 0x00:  /* HSI used as system clock source */
+      SystemCoreClock = HSI_VALUE;
+      break;
+    case 0x04:  /* HSE used as system clock source */
+      SystemCoreClock = HSE_VALUE;
+      break;
+    case 0x08:  /* PLL used as system clock source */
+
+      /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL_M) * PLL_N
+         SYSCLK = PLL_VCO / PLL_P
+         */    
+      pllsource = (RCC->PLLCFGR & RCC_PLLCFGR_PLLSRC) >> 22;
+      pllm = RCC->PLLCFGR & RCC_PLLCFGR_PLLM;
+      
+      if (pllsource != 0)
+      {
+        /* HSE used as PLL clock source */
+        pllvco = (HSE_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
+      }
+      else
+      {
+        /* HSI used as PLL clock source */
+        pllvco = (HSI_VALUE / pllm) * ((RCC->PLLCFGR & RCC_PLLCFGR_PLLN) >> 6);
+      }
+
+      pllp = (((RCC->PLLCFGR & RCC_PLLCFGR_PLLP) >>16) + 1 ) *2;
+      SystemCoreClock = pllvco/pllp;
+      break;
+    default:
+      SystemCoreClock = HSI_VALUE;
+      break;
+  }
+  /* Compute HCLK frequency --------------------------------------------------*/
+  /* Get HCLK prescaler */
+  tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)];
+  /* HCLK frequency */
+  SystemCoreClock >>= tmp;
+}
+
+#if defined (DATA_IN_ExtSRAM) && defined (DATA_IN_ExtSDRAM)
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx)
+/**
+  * @brief  Setup the external memory controller.
+  *         Called in startup_stm32f4xx.s before jump to main.
+  *         This function configures the external memories (SRAM/SDRAM)
+  *         This SRAM/SDRAM will be used as program data memory (including heap and stack).
+  * @param  None
+  * @retval None
+  */
+void SystemInit_ExtMemCtl(void)
+{
+  __IO uint32_t tmp = 0x00;
+
+  register uint32_t tmpreg = 0, timeout = 0xFFFF;
+  register __IO uint32_t index;
+
+  /* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface clock */
+  RCC->AHB1ENR |= 0x000001F8;
+
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);
+  
+  /* Connect PDx pins to FMC Alternate function */
+  GPIOD->AFR[0]  = 0x00CCC0CC;
+  GPIOD->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xAAAA0A8A;
+  /* Configure PDx pins speed to 100 MHz */  
+  GPIOD->OSPEEDR = 0xFFFF0FCF;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00CC0CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA828A;
+  /* Configure PEx pins speed to 100 MHz */ 
+  GPIOE->OSPEEDR = 0xFFFFC3CF;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+  
+  /* Connect PFx pins to FMC Alternate function */
+  GPIOF->AFR[0]  = 0xCCCCCCCC;
+  GPIOF->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA800AAA;
+  /* Configure PFx pins speed to 50 MHz */ 
+  GPIOF->OSPEEDR = 0xAA800AAA;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FMC Alternate function */
+  GPIOG->AFR[0]  = 0xCCCCCCCC;
+  GPIOG->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0xAAAAAAAA;
+  /* Configure PGx pins speed to 50 MHz */ 
+  GPIOG->OSPEEDR = 0xAAAAAAAA;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+  
+  /* Connect PHx pins to FMC Alternate function */
+  GPIOH->AFR[0]  = 0x00C0CC00;
+  GPIOH->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PHx pins in Alternate function mode */ 
+  GPIOH->MODER   = 0xAAAA08A0;
+  /* Configure PHx pins speed to 50 MHz */ 
+  GPIOH->OSPEEDR = 0xAAAA08A0;
+  /* Configure PHx pins Output type to push-pull */  
+  GPIOH->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PHx pins */ 
+  GPIOH->PUPDR   = 0x00000000;
+  
+  /* Connect PIx pins to FMC Alternate function */
+  GPIOI->AFR[0]  = 0xCCCCCCCC;
+  GPIOI->AFR[1]  = 0x00000CC0;
+  /* Configure PIx pins in Alternate function mode */ 
+  GPIOI->MODER   = 0x0028AAAA;
+  /* Configure PIx pins speed to 50 MHz */ 
+  GPIOI->OSPEEDR = 0x0028AAAA;
+  /* Configure PIx pins Output type to push-pull */  
+  GPIOI->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PIx pins */ 
+  GPIOI->PUPDR   = 0x00000000;
+  
+/*-- FMC Configuration -------------------------------------------------------*/
+  /* Enable the FMC interface clock */
+  RCC->AHB3ENR |= 0x00000001;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+
+  FMC_Bank5_6->SDCR[0] = 0x000019E4;
+  FMC_Bank5_6->SDTR[0] = 0x01115351;      
+  
+  /* SDRAM initialization sequence */
+  /* Clock enable command */
+  FMC_Bank5_6->SDCMR = 0x00000011; 
+  tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+
+  /* Delay */
+  for (index = 0; index<1000; index++);
+  
+  /* PALL command */
+  FMC_Bank5_6->SDCMR = 0x00000012;           
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+  
+  /* Auto refresh command */
+  FMC_Bank5_6->SDCMR = 0x00000073;
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+ 
+  /* MRD register program */
+  FMC_Bank5_6->SDCMR = 0x00046014;
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  } 
+  
+  /* Set refresh count */
+  tmpreg = FMC_Bank5_6->SDRTR;
+  FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
+  
+  /* Disable write protection */
+  tmpreg = FMC_Bank5_6->SDCR[0]; 
+  FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
+
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001011;
+  FMC_Bank1->BTCR[3]  = 0x00000201;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
+#if defined(STM32F469xx) || defined(STM32F479xx)
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001091;
+  FMC_Bank1->BTCR[3]  = 0x00110212;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F469xx || STM32F479xx */
+
+  (void)(tmp); 
+}
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx */
+#elif defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+/**
+  * @brief  Setup the external memory controller.
+  *         Called in startup_stm32f4xx.s before jump to main.
+  *         This function configures the external memories (SRAM/SDRAM)
+  *         This SRAM/SDRAM will be used as program data memory (including heap and stack).
+  * @param  None
+  * @retval None
+  */
+void SystemInit_ExtMemCtl(void)
+{
+  __IO uint32_t tmp = 0x00;
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F446xx) || defined(STM32F469xx) || defined(STM32F479xx)
+#if defined (DATA_IN_ExtSDRAM)
+  register uint32_t tmpreg = 0, timeout = 0xFFFF;
+  register __IO uint32_t index;
+
+#if defined(STM32F446xx)
+  /* Enable GPIOA, GPIOC, GPIOD, GPIOE, GPIOF, GPIOG interface
+      clock */
+  RCC->AHB1ENR |= 0x0000007D;
+#else
+  /* Enable GPIOC, GPIOD, GPIOE, GPIOF, GPIOG, GPIOH and GPIOI interface 
+      clock */
+  RCC->AHB1ENR |= 0x000001F8;
+#endif /* STM32F446xx */  
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIOCEN);
+  
+#if defined(STM32F446xx)
+  /* Connect PAx pins to FMC Alternate function */
+  GPIOA->AFR[0]  |= 0xC0000000;
+  GPIOA->AFR[1]  |= 0x00000000;
+  /* Configure PDx pins in Alternate function mode */
+  GPIOA->MODER   |= 0x00008000;
+  /* Configure PDx pins speed to 50 MHz */
+  GPIOA->OSPEEDR |= 0x00008000;
+  /* Configure PDx pins Output type to push-pull */
+  GPIOA->OTYPER  |= 0x00000000;
+  /* No pull-up, pull-down for PDx pins */
+  GPIOA->PUPDR   |= 0x00000000;
+
+  /* Connect PCx pins to FMC Alternate function */
+  GPIOC->AFR[0]  |= 0x00CC0000;
+  GPIOC->AFR[1]  |= 0x00000000;
+  /* Configure PDx pins in Alternate function mode */
+  GPIOC->MODER   |= 0x00000A00;
+  /* Configure PDx pins speed to 50 MHz */
+  GPIOC->OSPEEDR |= 0x00000A00;
+  /* Configure PDx pins Output type to push-pull */
+  GPIOC->OTYPER  |= 0x00000000;
+  /* No pull-up, pull-down for PDx pins */
+  GPIOC->PUPDR   |= 0x00000000;
+#endif /* STM32F446xx */
+
+  /* Connect PDx pins to FMC Alternate function */
+  GPIOD->AFR[0]  = 0x000000CC;
+  GPIOD->AFR[1]  = 0xCC000CCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xA02A000A;
+  /* Configure PDx pins speed to 50 MHz */  
+  GPIOD->OSPEEDR = 0xA02A000A;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00000CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA800A;
+  /* Configure PEx pins speed to 50 MHz */ 
+  GPIOE->OSPEEDR = 0xAAAA800A;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+
+  /* Connect PFx pins to FMC Alternate function */
+  GPIOF->AFR[0]  = 0xCCCCCCCC;
+  GPIOF->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA800AAA;
+  /* Configure PFx pins speed to 50 MHz */ 
+  GPIOF->OSPEEDR = 0xAA800AAA;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FMC Alternate function */
+  GPIOG->AFR[0]  = 0xCCCCCCCC;
+  GPIOG->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0xAAAAAAAA;
+  /* Configure PGx pins speed to 50 MHz */ 
+  GPIOG->OSPEEDR = 0xAAAAAAAA;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx)  
+  /* Connect PHx pins to FMC Alternate function */
+  GPIOH->AFR[0]  = 0x00C0CC00;
+  GPIOH->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PHx pins in Alternate function mode */ 
+  GPIOH->MODER   = 0xAAAA08A0;
+  /* Configure PHx pins speed to 50 MHz */ 
+  GPIOH->OSPEEDR = 0xAAAA08A0;
+  /* Configure PHx pins Output type to push-pull */  
+  GPIOH->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PHx pins */ 
+  GPIOH->PUPDR   = 0x00000000;
+  
+  /* Connect PIx pins to FMC Alternate function */
+  GPIOI->AFR[0]  = 0xCCCCCCCC;
+  GPIOI->AFR[1]  = 0x00000CC0;
+  /* Configure PIx pins in Alternate function mode */ 
+  GPIOI->MODER   = 0x0028AAAA;
+  /* Configure PIx pins speed to 50 MHz */ 
+  GPIOI->OSPEEDR = 0x0028AAAA;
+  /* Configure PIx pins Output type to push-pull */  
+  GPIOI->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PIx pins */ 
+  GPIOI->PUPDR   = 0x00000000;
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx */
+  
+/*-- FMC Configuration -------------------------------------------------------*/
+  /* Enable the FMC interface clock */
+  RCC->AHB3ENR |= 0x00000001;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+
+  /* Configure and enable SDRAM bank1 */
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDCR[0] = 0x00001954;
+#else  
+  FMC_Bank5_6->SDCR[0] = 0x000019E4;
+#endif /* STM32F446xx */
+  FMC_Bank5_6->SDTR[0] = 0x01115351;      
+  
+  /* SDRAM initialization sequence */
+  /* Clock enable command */
+  FMC_Bank5_6->SDCMR = 0x00000011; 
+  tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+
+  /* Delay */
+  for (index = 0; index<1000; index++);
+  
+  /* PALL command */
+  FMC_Bank5_6->SDCMR = 0x00000012;           
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+  
+  /* Auto refresh command */
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDCMR = 0x000000F3;
+#else  
+  FMC_Bank5_6->SDCMR = 0x00000073;
+#endif /* STM32F446xx */
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  }
+ 
+  /* MRD register program */
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDCMR = 0x00044014;
+#else  
+  FMC_Bank5_6->SDCMR = 0x00046014;
+#endif /* STM32F446xx */
+  timeout = 0xFFFF;
+  while((tmpreg != 0) && (timeout-- > 0))
+  {
+    tmpreg = FMC_Bank5_6->SDSR & 0x00000020; 
+  } 
+  
+  /* Set refresh count */
+  tmpreg = FMC_Bank5_6->SDRTR;
+#if defined(STM32F446xx)
+  FMC_Bank5_6->SDRTR = (tmpreg | (0x0000050C<<1));
+#else    
+  FMC_Bank5_6->SDRTR = (tmpreg | (0x0000027C<<1));
+#endif /* STM32F446xx */
+  
+  /* Disable write protection */
+  tmpreg = FMC_Bank5_6->SDCR[0]; 
+  FMC_Bank5_6->SDCR[0] = (tmpreg & 0xFFFFFDFF);
+#endif /* DATA_IN_ExtSDRAM */
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx || STM32F446xx || STM32F469xx || STM32F479xx */
+
+#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx) || defined(STM32F417xx)\
+ || defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)\
+ || defined(STM32F469xx) || defined(STM32F479xx) || defined(STM32F412Zx) || defined(STM32F412Vx)
+
+#if defined(DATA_IN_ExtSRAM)
+/*-- GPIOs Configuration -----------------------------------------------------*/
+   /* Enable GPIOD, GPIOE, GPIOF and GPIOG interface clock */
+  RCC->AHB1ENR   |= 0x00000078;
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB1ENR, RCC_AHB1ENR_GPIODEN);
+  
+  /* Connect PDx pins to FMC Alternate function */
+  GPIOD->AFR[0]  = 0x00CCC0CC;
+  GPIOD->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PDx pins in Alternate function mode */  
+  GPIOD->MODER   = 0xAAAA0A8A;
+  /* Configure PDx pins speed to 100 MHz */  
+  GPIOD->OSPEEDR = 0xFFFF0FCF;
+  /* Configure PDx pins Output type to push-pull */  
+  GPIOD->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PDx pins */ 
+  GPIOD->PUPDR   = 0x00000000;
+
+  /* Connect PEx pins to FMC Alternate function */
+  GPIOE->AFR[0]  = 0xC00CC0CC;
+  GPIOE->AFR[1]  = 0xCCCCCCCC;
+  /* Configure PEx pins in Alternate function mode */ 
+  GPIOE->MODER   = 0xAAAA828A;
+  /* Configure PEx pins speed to 100 MHz */ 
+  GPIOE->OSPEEDR = 0xFFFFC3CF;
+  /* Configure PEx pins Output type to push-pull */  
+  GPIOE->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PEx pins */ 
+  GPIOE->PUPDR   = 0x00000000;
+
+  /* Connect PFx pins to FMC Alternate function */
+  GPIOF->AFR[0]  = 0x00CCCCCC;
+  GPIOF->AFR[1]  = 0xCCCC0000;
+  /* Configure PFx pins in Alternate function mode */   
+  GPIOF->MODER   = 0xAA000AAA;
+  /* Configure PFx pins speed to 100 MHz */ 
+  GPIOF->OSPEEDR = 0xFF000FFF;
+  /* Configure PFx pins Output type to push-pull */  
+  GPIOF->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PFx pins */ 
+  GPIOF->PUPDR   = 0x00000000;
+
+  /* Connect PGx pins to FMC Alternate function */
+  GPIOG->AFR[0]  = 0x00CCCCCC;
+  GPIOG->AFR[1]  = 0x000000C0;
+  /* Configure PGx pins in Alternate function mode */ 
+  GPIOG->MODER   = 0x00085AAA;
+  /* Configure PGx pins speed to 100 MHz */ 
+  GPIOG->OSPEEDR = 0x000CAFFF;
+  /* Configure PGx pins Output type to push-pull */  
+  GPIOG->OTYPER  = 0x00000000;
+  /* No pull-up, pull-down for PGx pins */ 
+  GPIOG->PUPDR   = 0x00000000;
+  
+/*-- FMC/FSMC Configuration --------------------------------------------------*/
+  /* Enable the FMC/FSMC interface clock */
+  RCC->AHB3ENR         |= 0x00000001;
+
+#if defined(STM32F427xx) || defined(STM32F437xx) || defined(STM32F429xx) || defined(STM32F439xx)
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001011;
+  FMC_Bank1->BTCR[3]  = 0x00000201;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F427xx || STM32F437xx || STM32F429xx || STM32F439xx */ 
+#if defined(STM32F469xx) || defined(STM32F479xx)
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FMCEN);
+  /* Configure and enable Bank1_SRAM2 */
+  FMC_Bank1->BTCR[2]  = 0x00001091;
+  FMC_Bank1->BTCR[3]  = 0x00110212;
+  FMC_Bank1E->BWTR[2] = 0x0fffffff;
+#endif /* STM32F469xx || STM32F479xx */
+#if defined(STM32F405xx) || defined(STM32F415xx) || defined(STM32F407xx)|| defined(STM32F417xx)\
+   || defined(STM32F412Zx) || defined(STM32F412Vx)
+  /* Delay after an RCC peripheral clock enabling */
+  tmp = READ_BIT(RCC->AHB3ENR, RCC_AHB3ENR_FSMCEN);
+  /* Configure and enable Bank1_SRAM2 */
+  FSMC_Bank1->BTCR[2]  = 0x00001011;
+  FSMC_Bank1->BTCR[3]  = 0x00000201;
+  FSMC_Bank1E->BWTR[2] = 0x0FFFFFFF;
+#endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F412Zx || STM32F412Vx */
+
+#endif /* DATA_IN_ExtSRAM */
+#endif /* STM32F405xx || STM32F415xx || STM32F407xx || STM32F417xx || STM32F427xx || STM32F437xx ||\
+          STM32F429xx || STM32F439xx || STM32F469xx || STM32F479xx || STM32F412Zx || STM32F412Vx  */ 
+  (void)(tmp); 
+}
+#endif /* DATA_IN_ExtSRAM && DATA_IN_ExtSDRAM */
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+
+/**
+  * @}
+  */
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/

scripts/buildcommands.py

@@ -0,0 +1,254 @@
+#!/usr/bin/env python2
+# Script to handle build time requests embedded in C code.
+#
+# Copyright (C) 2016-2018  Kevin O'Connor <kevin@koconnor.net>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import sys, optparse, logging
+
+FILEHEADER = """
+/* DO NOT EDIT! This is an autogenerated file. See scripts/buildcommands.py. */
+
+#include <stdint.h>
+#include "compiler.h"
+#include "board/misc.h"
+#include "board/gpio.h"
+"""
+
+def error(msg):
+    sys.stderr.write(msg + "\n")
+    sys.exit(-1)
+
+Handlers = []
+
+######################################################################
+# Enumeration and static string generation
+######################################################################
+
+STATIC_STRING_MIN = 2
+
+# Generate a dynamic string to integer mapping
+class HandleEnumerations:
+    def __init__(self):
+        self.static_strings = []
+        self.enumerations = {}
+        self.ctr_dispatch = {
+            'DECL_ENUMERATION': self.decl_enumeration,
+            'DECL_ENUMERATION_RANGE': self.decl_enumeration_range
+        }
+    def add_enumeration(self, enum, name, value):
+        enums = self.enumerations.setdefault(enum, {})
+        if name in enums and enums[name] != value:
+            error("Conflicting definition for enumeration '%s %s'" % (
+                enum, name))
+        enums[name] = value
+    def decl_enumeration(self, req):
+        enum, name, value = req.split()[1:]
+        self.add_enumeration(enum, name, int(value, 0))
+    def decl_enumeration_range(self, req):
+        enum, name, value, count = req.split()[1:]
+        self.add_enumeration(enum, name, (int(value, 0), int(count, 0)))
+    def get_available_pins(self):
+        avail_pins = {}
+        pin_enums = self.enumerations.get('pin')
+        if pin_enums is None:
+            error("No pin enumeration available")
+        for port_id, (offset, count) in pin_enums.items():
+            for i in range(count):
+                pin_name = "%s%d" % (port_id[:-1], i)
+                pin_num = i + offset
+                avail_pins[pin_name] = pin_num
+        return avail_pins
+    def generate_code(self, options):
+        return ""
+
+
+HandlerEnumerations = HandleEnumerations()
+Handlers.append(HandlerEnumerations)
+
+
+######################################################################
+# Constants
+######################################################################
+
+# Allow adding build time constants to the data dictionary
+class HandleConstants:
+    def __init__(self):
+        self.constants = {}
+        self.ctr_dispatch = {
+            'DECL_CONSTANT': self.decl_constant,
+            'DECL_CONSTANT_STR': self.decl_constant_str,
+        }
+        self.reserved_pins = []
+    def set_value(self, name, value):
+        if name in self.constants and self.constants[name] != value:
+            error("Conflicting definition for constant '%s'" % name)
+        self.constants[name] = value
+    def decl_constant(self, req):
+        name, value = req.split()[1:]
+        self.set_value(name, int(value, 0))
+    def decl_constant_str(self, req):
+        name, value = req.split(None, 2)[1:]
+        value = value.strip()
+        if value.startswith('"') and value.endswith('"'):
+            value = value[1:-1]
+        self.set_value(name, value)
+    def get_reserved_pins(self):
+        reserved_pins = []
+        for name, val in self.constants.items():
+            if name.upper().startswith("RESERVE_PINS"):
+                rpins = [v.strip() for v in val.split(',') if v.strip()]
+                reserved_pins.extend(rpins)
+        return reserved_pins
+    def generate_code(self, options):
+        return ""
+
+
+HandlerConstants = HandleConstants()
+Handlers.append(HandlerConstants)
+
+######################################################################
+# ARM IRQ vector table generation
+######################################################################
+
+# Create ARM IRQ vector table from interrupt handler declarations
+class Handle_arm_irq:
+    def __init__(self):
+        self.irqs = {}
+        self.ctr_dispatch = { 'DECL_ARMCM_IRQ': self.decl_armcm_irq }
+    def decl_armcm_irq(self, req):
+        func, num = req.split()[1:]
+        num = int(num, 0)
+        if num in self.irqs and self.irqs[num] != func:
+            error("Conflicting IRQ definition %d (old %s new %s)"
+                  % (num, self.irqs[num], func))
+        self.irqs[num] = func
+    def generate_code(self, options):
+        armcm_offset = 16
+        if 1 - armcm_offset not in self.irqs:
+            # The ResetHandler was not defined - don't build VectorTable
+            return ""
+        max_irq = max(self.irqs.keys())
+        table = ["    DefaultHandler,\n"] * (max_irq + armcm_offset + 1)
+        defs = []
+        for num, func in self.irqs.items():
+            if num < 1 - armcm_offset:
+                error("Invalid IRQ %d (%s)" % (num, func))
+            defs.append("extern void %s(void);\n" % (func,))
+            table[num + armcm_offset] = "    %s,\n" % (func,)
+        table[0] = "    &_stack_end,\n"
+        fmt = """
+extern void DefaultHandler(void);
+extern uint32_t _stack_end;
+%s
+const void *VectorTable[] __visible __section(".vector_table") = {
+%s};
+"""
+        return fmt % (''.join(defs), ''.join(table))
+
+
+Handlers.append(Handle_arm_irq())
+
+######################################################################
+# Status LED Functionality
+######################################################################
+
+class HandleStatusLED:
+    def __init__(self):
+        self.ctr_dispatch = {}
+    def generate_code(self, options):
+        pin = options.led_pin
+        if not pin:
+            led_def = led_init = led_toggle = led_on = led_off = ""
+        else:
+            led_def = "static struct gpio_out led;"
+            led_init = "led = gpio_out_setup(%d, %d);"
+            led_toggle = "gpio_out_toggle(led);"
+            led_write = "gpio_out_write(led, %d);"
+            write_on = 1
+            if pin[0] == "!":
+                write_on = 0
+                pin = pin[1:].upper()
+            avail_pins = HandlerEnumerations.get_available_pins()
+            reserved_pins = HandlerConstants.get_reserved_pins()
+            pin_num = avail_pins.get(pin)
+            if pin_num is None:
+                error("Pin %s is not available for this build" % pin)
+            if pin in reserved_pins:
+                error("Pin %s is reserved by an active MCU peripheral" % pin)
+            led_init = led_init % (pin_num, write_on)
+            led_on = led_write % (write_on)
+            led_off = led_write % (int(not write_on))
+        fmt = """
+
+%s
+
+void __always_inline
+led_init(void)
+{
+    %s
+}
+
+void __always_inline
+led_toggle(void)
+{
+    %s
+}
+
+void __always_inline
+led_on(void)
+{
+    %s
+}
+
+void __always_inline
+led_off(void)
+{
+    %s
+}
+"""
+        return fmt % (led_def, led_init, led_toggle, led_on, led_off)
+
+
+Handlers.append(HandleStatusLED())
+
+######################################################################
+# Main code
+######################################################################
+
+def main():
+    usage = "%prog [options] <cmd section file> <output.c>"
+    opts = optparse.OptionParser(usage)
+    opts.add_option("-l", "--ledpin", dest="led_pin", default="",
+                    help="LED Status Pin")
+    opts.add_option("-v", action="store_true", dest="verbose",
+                    help="enable debug messages")
+    options, args = opts.parse_args()
+    if len(args) != 2:
+        opts.error("Incorrect arguments")
+    incmdfile, outcfile = args
+    if options.verbose:
+        logging.basicConfig(level=logging.DEBUG)
+
+    # Parse request file
+    ctr_dispatch = { k: v for h in Handlers for k, v in h.ctr_dispatch.items() }
+    f = open(incmdfile, 'rb')
+    data = f.read()
+    f.close()
+    for req in data.split('\n'):
+        req = req.lstrip()
+        if not req:
+            continue
+        cmd = req.split()[0]
+        if cmd not in ctr_dispatch:
+            error("Unknown build time command '%s'" % cmd)
+        ctr_dispatch[cmd](req)
+
+    # Write output
+    code = "".join([FILEHEADER] + [h.generate_code(options) for h in Handlers])
+    f = open(outcfile, 'wb')
+    f.write(code)
+    f.close()
+
+if __name__ == '__main__':
+    main()

scripts/check-gcc.sh

@@ -0,0 +1,18 @@
+#!/bin/sh
+# This script checks for a broken Ubuntu 18.04 arm-none-eabi-gcc compile
+
+f1="$1"
+f2="$2"
+
+s1=`readelf -A "$f1" | grep "Tag_ARM_ISA_use"`
+s2=`readelf -A "$f2" | grep "Tag_ARM_ISA_use"`
+
+if [ "$s1" != "$s2" ]; then
+    echo ""
+    echo "ERROR: The compiler failed to correctly compile Klipper"
+    echo "It will be necessary to upgrade the compiler"
+    echo "See: https://bugs.launchpad.net/ubuntu/+source/newlib/+bug/1767223"
+    echo ""
+    rm -f "$f1"
+    exit 99
+fi

scripts/flash_can.py

@@ -0,0 +1,197 @@
+#!/usr/bin/env python2
+# Script to upload software via Can Bootloader
+#
+# Copyright (C) 2021 Eric Callahan <arksine.code@gmail.com>
+#
+# This file may be distributed under the terms of the GNU GPLv3 license.
+import sys
+import os
+import time
+import argparse
+import hashlib
+import traceback
+import serial
+
+def output_line(msg):
+    sys.stdout.write(msg + "\n")
+    sys.stdout.flush()
+
+def output(msg):
+    sys.stdout.write(msg)
+    sys.stdout.flush()
+
+
+SERIAL_BAUD = 250000
+CMD_HEADER = b"cbtl"
+CMD_TRAILER = b"\x03"
+BOOTLOADER_CMDS = {
+    'CONNECT': b"\x01",
+    'SEND_BLOCK': b"\x02",
+    'SEND_EOF': b"\x03",
+    'REQUEST_BLOCK': b"\x04",
+    'COMPLETE': b"\x05"
+}
+ACK_CMD = bytearray(CMD_HEADER + b"\x10")
+ACK_BLOCK_RECD = bytearray(CMD_HEADER + b"\x11")
+NACK = bytearray(CMD_HEADER + b"\x20")
+
+class FlashCanError(Exception):
+    pass
+
+class FlashCan:
+    def __init__(self, dev_name, fw_file):
+        if not os.path.exists(dev_name):
+            raise FlashCanError("Cannot find device '%s'" % (dev_name))
+        if not os.path.isfile(fw_file):
+            raise FlashCanError("Invalid firmware path '%s'" % (fw_file))
+        # TODO:  We need to enter the bootloader first
+        self.ser = serial.Serial(dev_name, SERIAL_BAUD, timeout=.1)
+        self.fw_name = fw_file
+        self.fw_sha = hashlib.sha1()
+        self.file_size = 0
+        self.block_size = 64
+        self.block_count = 0
+
+    def connect_btl(self):
+        output_line("Attempting to connect to bootloader")
+        self.block_size = self.send_command('CONNECT')
+        if self.block_size not in [64, 128, 256, 512]:
+            raise FlashCanError("Invalid Block Size: %d" % (self.block_size,))
+        output_line("Connected, Block Size: %d bytes" % (self.block_size,))
+
+    def serial_read(self, count):
+        ret = b""
+        tries = 10
+        while tries:
+            data = self.ser.read(count)
+            count -= len(data)
+            ret += data
+            if not count:
+                break
+            tries -= 1
+        return ret
+
+    def send_command(self, cmdname, ack=ACK_CMD, arg=0, tries=5):
+        cmd = BOOTLOADER_CMDS[cmdname]
+        out_cmd = bytearray(CMD_HEADER + cmd)
+        out_cmd.append((arg >> 8) & 0xFF)
+        out_cmd.append(arg & 0xFF)
+        out_cmd.append(CMD_TRAILER)
+        while tries:
+            try:
+                self.ser.write(out_cmd)
+                data = bytearray(self.serial_read(8))
+            except Exception:
+                traceback.print_exc()
+            else:
+                if len(data) == 8 and data.startswith(ack) and \
+                        data.endswith(CMD_TRAILER):
+                    return (data[5] << 8) | data[6]
+            tries -= 1
+            time.sleep(.1)
+        raise FlashCanError("Error sending command [%s] to Can Device"
+                            % (cmdname))
+
+    def send_file(self):
+        last_percent = 0
+        output_line("Flashing '%s'..." % (self.fw_name))
+        output("\n[")
+        with open(self.fw_name, 'rb') as f:
+            f.seek(0, os.SEEK_END)
+            self.file_size = f.tell()
+            f.seek(0)
+            while True:
+                buf = f.read(self.block_size)
+                if not buf:
+                    break
+                self.send_command('SEND_BLOCK', arg=self.block_count)
+                if len(buf) < self.block_size:
+                    buf += b"\xFF" * (self.block_size - len(buf))
+                self.fw_sha.update(buf)
+                self.ser.write(buf)
+                ack = self.serial_read(8)
+                expect = bytearray(ACK_BLOCK_RECD)
+                expect.append((self.block_count >> 8) & 0xFF)
+                expect.append(self.block_count & 0xFF)
+                expect.append(CMD_TRAILER)
+                if ack != expect:
+                    output_line("\nExpected resp: %s, Recd: %s" % (expect, ack))
+                    raise FlashCanError("Did not receive ACK for sent block %d"
+                                        % (self.block_count))
+                self.block_count += 1
+                uploaded = self.block_count * self.block_size
+                pct = int(uploaded / float(self.file_size) * 100 + .5)
+                if pct >= last_percent + 2:
+                    last_percent += 2.
+                    output("#")
+            page_count = self.send_command('SEND_EOF')
+            output_line("]\n\nWrite complete: %d pages" % (page_count))
+
+    def verify_file(self):
+        last_percent = 0
+        output_line("Verifying (block count = %d)..." % (self.block_count,))
+        output("\n[")
+        ver_sha = hashlib.sha1()
+        for i in range(self.block_count):
+            tries = 3
+            while tries:
+                resp = self.send_command("REQUEST_BLOCK", arg=i)
+                if resp == i:
+                    # command should ack with the requested block as
+                    # parameter
+                    buf = self.serial_read(self.block_size)
+                    if len(buf) == self.block_size:
+                        break
+                tries -= 1
+                time.sleep(.1)
+            else:
+                output_line("Error")
+                raise FlashCanError("Block Request Error, block: %d" % (i,))
+            ver_sha.update(buf)
+            pct = int(i * self.block_size / float(self.file_size) * 100 + .5)
+            if pct >= last_percent + 2:
+                last_percent += 2
+                output("#")
+        ver_hex = ver_sha.hexdigest().upper()
+        fw_hex = self.fw_sha.hexdigest().upper()
+        if ver_hex != fw_hex:
+            raise FlashCanError("Checksum mismatch: Expected %s, Received %s"
+                                % (fw_hex, ver_hex))
+        output_line("]\n\nVerification Complete: SHA = %s" % (ver_hex))
+
+    def finish(self):
+        self.send_command("COMPLETE")
+
+    def close(self):
+        self.ser.close()
+
+def main():
+    parser = argparse.ArgumentParser(
+        description="Can Bootloader Flash Utility")
+    parser.add_argument('device', metavar="<device>",
+                        help="Can device location")
+    parser.add_argument('fwpath', metavar="<klipper.bin>",
+                        help="Path to firmware file")
+    args = parser.parse_args()
+    fcan = None
+    dev = args.device
+    fname = os.path.abspath(os.path.expanduser(args.fwpath))
+    try:
+        fcan = FlashCan(dev, fname)
+        time.sleep(1.)
+        fcan.connect_btl()
+        fcan.send_file()
+        fcan.verify_file()
+        fcan.finish()
+    except Exception as e:
+        output("Can Flash Error: ")
+        output_line(str(e))
+        sys.exit(-1)
+    finally:
+        if fcan is not None:
+            fcan.close()
+    output_line("CAN Flash Success")
+
+
+if __name__ == '__main__':
+    main()

src/Kconfig

@@ -0,0 +1,25 @@
+# Main Kconfig settings
+
+mainmenu "CanBoot Configuration"
+
+config MACH_STM32
+    bool
+    default y
+
+source "src/stm32/Kconfig"
+
+config CANSERIAL
+    bool
+    default y
+
+config CANBUS_BAUD
+    int "CAN bus speed"
+    default 500000
+
+config ENABLE_LED
+    bool "Enable Status LED"
+    default n
+
+config STATUS_LED_PIN
+    string "Status LED GPIO Pin"
+    depends on ENABLE_LED

src/Makefile

@@ -0,0 +1,3 @@
+# Main code build rules
+
+src-y += canboot_main.c

src/byteorder.h

@@ -0,0 +1,40 @@
+#ifndef __BYTEORDER_H
+#define __BYTEORDER_H
+
+#include <stdint.h> // uint32_t
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+
+#define cpu_to_le16(x) ((uint16_t)(x))
+#define cpu_to_le32(x) ((uint32_t)(x))
+#define cpu_to_le64(x) ((uint64_t)(x))
+#define le16_to_cpu(x) ((uint16_t)(x))
+#define le32_to_cpu(x) ((uint32_t)(x))
+#define le64_to_cpu(x) ((uint64_t)(x))
+
+#define cpu_to_be16(x) __builtin_bswap16(x)
+#define cpu_to_be32(x) __builtin_bswap32(x)
+#define cpu_to_be64(x) __builtin_bswap64(x)
+#define be16_to_cpu(x) __builtin_bswap16(x)
+#define be32_to_cpu(x) __builtin_bswap32(x)
+#define be64_to_cpu(x) __builtin_bswap64(x)
+
+#else // big endian
+
+#define cpu_to_le16(x) __builtin_bswap16(x)
+#define cpu_to_le32(x) __builtin_bswap32(x)
+#define cpu_to_le64(x) __builtin_bswap64(x)
+#define le16_to_cpu(x) __builtin_bswap16(x)
+#define le32_to_cpu(x) __builtin_bswap32(x)
+#define le64_to_cpu(x) __builtin_bswap64(x)
+
+#define cpu_to_be16(x) ((uint16_t)(x))
+#define cpu_to_be32(x) ((uint32_t)(x))
+#define cpu_to_be64(x) ((uint64_t)(x))
+#define be16_to_cpu(x) ((uint16_t)(x))
+#define be32_to_cpu(x) ((uint32_t)(x))
+#define be64_to_cpu(x) ((uint64_t)(x))
+
+#endif
+
+#endif // byteorder.h

src/canboot_main.c

@@ -0,0 +1,269 @@
+// Canboot main event loop
+//
+// Copyright (C) 2021 Eric Callahan <arksine.code@gmail.com>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include <string.h>         // memmove
+#include "autoconf.h"       // CONFIG_*
+#include "board/misc.h"     // delay_ms
+#include "board/canbus.h"   // canbus_send
+#include "board/flash.h"    // write_page
+#include "canboot_main.h"   // canboot_main
+
+
+#define COMMAND_SIZE    8
+#define CMD_BUF_SIZE    16
+#define CMD_CONNECT     0x01
+#define CMD_RX_BLOCK    0x02
+#define CMD_RX_EOF      0x03
+#define CMD_REQ_BLOCK   0x04
+#define CMD_COMPLETE    0x05
+#define ACK_COMMAND     0x10
+#define ACK_BLOCK_RX    0x11
+#define NACK            0x20
+
+// Command Format:
+// <4 byte header> <1 byte cmd> <2 byte arg> <1 byte trailer>
+#define CMD_HEADER      0x6362746C  // "cbtl"
+#define CMD_TRAILER     0x03        // ETX
+
+#define WAIT_BLINK_TIME 1000000
+#define XFER_BLINK_TIME 10000
+
+static uint8_t page_buffer[CONFIG_FLASH_PAGE_SIZE];
+static uint8_t cmd_buf[CMD_BUF_SIZE];
+static uint8_t cmd_pos = 0;
+static uint16_t page_count = 0;
+static uint16_t page_pos = 0;
+static uint32_t last_blink_time = 0;
+static uint16_t cmd_arg = 0;
+enum { CMD_PENDING, RX_BLOCK, RX_DONE, TX_BLOCK, COMPLETE };
+static uint8_t current_state = CMD_PENDING;
+
+
+static void
+send_ack(uint8_t ack, uint16_t arg)
+{
+    uint8_t ack_buf[8];
+    ack_buf[0] = (CMD_HEADER >> 24) & 0xFF;
+    ack_buf[1] = (CMD_HEADER >> 16) & 0xFF;
+    ack_buf[2] = (CMD_HEADER >> 8) & 0xFF;
+    ack_buf[3] = CMD_HEADER & 0xFF;
+    ack_buf[4] = ack;
+    ack_buf[5] = (arg >> 8) & 0xFF;
+    ack_buf[6] = arg & 0xFF;
+    ack_buf[7] = CMD_TRAILER;
+    canboot_sendf(ack_buf, COMMAND_SIZE);
+}
+
+static inline void
+process_command(void)
+{
+    if (cmd_pos < COMMAND_SIZE)
+        return;
+
+    uint8_t cmd = 0xFF;
+    uint8_t remaining = cmd_pos;
+    uint8_t *tmpbuf = cmd_buf;
+    uint32_t header;
+    while (remaining) {
+        if (tmpbuf[0] == 0x63) {
+            // potential match
+            if (remaining >= COMMAND_SIZE) {
+                header = (tmpbuf[0] << 24) | (tmpbuf[1] << 16) | (tmpbuf[2] << 8)
+                    | (tmpbuf[3]);
+                if (header == CMD_HEADER && cmd_buf[7] == CMD_TRAILER) {
+                    cmd = tmpbuf[4];
+                    cmd_arg = (tmpbuf[5] << 8) | tmpbuf[6];
+                    remaining -= COMMAND_SIZE;
+                    break;
+                }
+            } else
+                // A potential command, check it after the next read
+                break;
+        }
+        remaining--;
+        tmpbuf++;
+    }
+    if (remaining) {
+        // move the buffer
+        uint8_t rpos = cmd_pos - remaining;
+        memmove(&cmd_buf[0], &cmd_buf[rpos], remaining);
+    }
+    cmd_pos = remaining;
+    switch (cmd) {
+        case CMD_CONNECT:
+            send_ack(ACK_COMMAND, CONFIG_BLOCK_SIZE);
+            // TODO: reinit page?
+            break;
+        case CMD_RX_BLOCK:
+            send_ack(ACK_COMMAND, cmd_arg);
+            current_state = RX_BLOCK;
+            break;
+        case CMD_RX_EOF:
+            // This will be ACK'ed after the final
+            // page is written
+            current_state = RX_DONE;
+            break;
+        case CMD_REQ_BLOCK:
+            send_ack(ACK_COMMAND, cmd_arg);
+            current_state = TX_BLOCK;
+            break;
+        case CMD_COMPLETE:
+            send_ack(ACK_COMMAND, 1);
+            current_state = COMPLETE;
+            break;
+        default:
+            // Unknown command or gabage data, NACK it
+            send_ack(NACK, 0);
+    }
+}
+
+static void
+write_page(uint16_t page)
+{
+    flash_write_page(page, (uint16_t*)page_buffer);
+    memset(page_buffer, 0xFF, CONFIG_FLASH_PAGE_SIZE);
+    page_pos = 0;
+}
+
+static void
+process_page(void) {
+    static uint16_t last_page_pos = 0;
+    uint8_t need_ack = 0;
+    if (page_pos == last_page_pos) {
+        return;
+    }
+    if (page_pos == CONFIG_FLASH_PAGE_SIZE)
+        write_page(page_count++);
+    if (page_pos % CONFIG_BLOCK_SIZE == 0) {
+        current_state = CMD_PENDING;
+        need_ack = 1;
+    }
+    last_page_pos = page_pos;
+    if (need_ack)
+        send_ack(ACK_BLOCK_RX, cmd_arg);
+}
+
+static void
+check_blink_time(uint32_t usec)
+{
+    uint32_t curtime = timer_read_time();
+    uint32_t endtime = last_blink_time + timer_from_us(usec);
+    if (timer_is_before(endtime, curtime)) {
+        led_toggle();
+        last_blink_time = timer_read_time();
+    }
+}
+
+static inline void
+process_state(void)
+{
+    switch (current_state) {
+        case CMD_PENDING:
+            check_blink_time(WAIT_BLINK_TIME);
+            process_command();
+            break;
+        case RX_BLOCK:
+            check_blink_time(XFER_BLINK_TIME);
+            process_page();
+            break;
+        case RX_DONE:
+            if (page_pos)
+                write_page(page_count++);
+            flash_complete();
+            current_state = CMD_PENDING;
+            send_ack(ACK_COMMAND, page_count);
+            break;
+        case TX_BLOCK:
+            // TODO: rather than tx the block, we can do the
+            // CRC check here?  CRC16 or SHA1?
+            check_blink_time(XFER_BLINK_TIME);
+            flash_read_block(cmd_arg, (uint32_t*)page_buffer);
+            canboot_sendf(page_buffer, CONFIG_BLOCK_SIZE);
+            current_state = CMD_PENDING;
+            break;
+    }
+}
+
+void
+canboot_process_rx(uint32_t id, uint32_t len, uint8_t *data)
+{
+    switch (current_state) {
+        case CMD_PENDING:
+            // read into the command buffer
+            if (cmd_pos >= CMD_BUF_SIZE)
+                return;
+            else if (cmd_pos + len > CMD_BUF_SIZE)
+                len = CMD_BUF_SIZE - cmd_pos;
+            memcpy(&cmd_buf[cmd_pos], data, len);
+            cmd_pos += len;
+            break;
+        case RX_BLOCK:
+            // read into into the page buffer
+            if (page_pos >= CONFIG_FLASH_PAGE_SIZE)
+                return;
+            else if (page_pos > CONFIG_FLASH_PAGE_SIZE)
+                len = CONFIG_FLASH_PAGE_SIZE - cmd_pos;
+            memcpy(&page_buffer[page_pos], data, len);
+            page_pos += len;
+            break;
+        default:
+            return;
+    }
+}
+
+
+/****************************************************************
+ * Startup
+ ****************************************************************/
+static void
+enter_bootloader(void)
+{
+    can_init();
+
+    // TODO: this is temporary.  It lets us know
+    // that the bootloader has been entered.  We can
+    // also toggle this as a means to visualize transfers.
+    // We will want to set it up in the menuconfig
+    led_init();
+    // The short delay is simply to ensure that the Debug Timer is
+    // enabled
+    udelay(10);
+    last_blink_time = timer_read_time();
+
+    for (;;) {
+        canbus_rx_task();
+        canbus_tx_task();
+        process_state();
+        if (current_state == COMPLETE && canbus_tx_clear())
+            // wait until we are complete and the ack has returned
+            break;
+    }
+
+    // Flash Complete, system reset
+    udelay(100000);
+    canbus_reboot();
+}
+
+// Main loop of program
+void
+canboot_main(void)
+{
+    uint16_t mkey = read_magic_key();
+    // Attempt to enter the bootloader.  This function should not
+    // return
+    if (mkey == CONFIG_MAGIC_KEY)
+        enter_bootloader();
+
+    // set magic key and delay for one second.  This enters the bootloader if
+    // the reset button is double clicked
+    set_magic_key();
+    udelay(1500000);
+    // No reset, read the key back out to clear it
+    read_magic_key();
+
+    // jump to app
+    jump_to_application();
+}

src/canboot_main.h

@@ -0,0 +1,10 @@
+#ifndef __CANBOOT_MAIN_H
+#define __CANBOOT_MAIN_H
+
+#include <stdint.h> // uint32_t
+
+void canboot_process_rx(uint32_t id, uint32_t len, uint8_t *data);
+void canboot_sendf(uint8_t* data, uint16_t size);
+void canboot_main(void);
+
+#endif // canboot_main.h

src/compiler.h

@@ -0,0 +1,46 @@
+#ifndef __COMPILER_H
+#define __COMPILER_H
+// Low level definitions for C languange and gcc compiler.
+
+#define barrier() __asm__ __volatile__("": : :"memory")
+
+#define likely(x)       __builtin_expect(!!(x), 1)
+#define unlikely(x)     __builtin_expect(!!(x), 0)
+
+#define noinline __attribute__((noinline))
+#ifndef __always_inline
+#define __always_inline inline __attribute__((always_inline))
+#endif
+#define __visible __attribute__((externally_visible))
+#define __noreturn __attribute__((noreturn))
+
+#define PACKED __attribute__((packed))
+#ifndef __aligned
+#define __aligned(x) __attribute__((aligned(x)))
+#endif
+#ifndef __section
+#define __section(S) __attribute__((section(S)))
+#endif
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))
+#define ALIGN(x,a)              __ALIGN_MASK(x,(typeof(x))(a)-1)
+#define __ALIGN_MASK(x,mask)    (((x)+(mask))&~(mask))
+#define ALIGN_DOWN(x,a)         ((x) & ~((typeof(x))(a)-1))
+
+#define container_of(ptr, type, member) ({                      \
+        const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
+        (type *)( (char *)__mptr - offsetof(type,member) );})
+
+#define __stringify_1(x)        #x
+#define __stringify(x)          __stringify_1(x)
+
+#define ___PASTE(a,b) a##b
+#define __PASTE(a,b) ___PASTE(a,b)
+
+#define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
+#define DIV_ROUND_CLOSEST(x, divisor)({                 \
+            typeof(divisor) __divisor = divisor;        \
+            (((x) + ((__divisor) / 2)) / (__divisor));  \
+        })
+
+#endif // compiler.h

src/ctr.h

@@ -0,0 +1,58 @@
+#ifndef __CTR_H
+#define __CTR_H
+// Definitions for creating compile time requests.  The DECL_CTR macro
+// produces requests (text strings) that are placed in a special
+// section of the intermediate object files (*.o).  The build extracts
+// these strings and places them in out/compile_time_requests.txt.
+// The scripts/buildcommand.py code then generates
+// out/compile_time_request.c from these requests.
+
+#include "compiler.h" // __section
+
+// Declare a compile time request
+#define DECL_CTR(REQUEST)                                               \
+    static char __PASTE(_DECLS_, __LINE__)[] __attribute__((used))      \
+        __section(".compile_time_request") = (REQUEST)
+
+// Macro to encode an integer for use with DECL_CTR_INT()
+#define _CTR_HEX(H) ((H) > 9 ? (H) - 10 + 'A' : (H) + '0')
+#define _CTR_SHIFT(V, S) _CTR_HEX(((uint32_t)(V) >> (S)) & 0x0f)
+#define _CTR_INT(V, S) ((V) < 0 ? _CTR_SHIFT(-(V), (S)) : _CTR_SHIFT((V), (S)))
+#define CTR_INT(VALUE) {                                \
+        ' ', (VALUE) < 0 ? '-' : '+', '0', 'x',         \
+        _CTR_INT((VALUE),28), _CTR_INT((VALUE),24),     \
+        _CTR_INT((VALUE),20), _CTR_INT((VALUE),16),     \
+        _CTR_INT((VALUE),12), _CTR_INT((VALUE),8),      \
+        _CTR_INT((VALUE),4), _CTR_INT((VALUE),0) }
+
+// Declare a compile time request with an integer expression
+#define DECL_CTR_INT(REQUEST, PARAM_COUNT, args...)     \
+    static struct {                                     \
+        char _request[sizeof(REQUEST)-1];               \
+        char _values[(PARAM_COUNT)][12];                \
+        char _end_of_line;                              \
+    } __PASTE(_DECLI_, __LINE__) __attribute__((used))  \
+        __section(".compile_time_request") = {          \
+        (REQUEST), { args }, 0 }
+
+
+/********************************************************************
+ *
+ *  Useful CTR macros from Klipper's command.h
+ *
+ *******************************************************************/
+
+// Declare a constant exported to the host
+#define DECL_CONSTANT(NAME, VALUE)                              \
+    DECL_CTR_INT("DECL_CONSTANT " NAME, 1, CTR_INT(VALUE))
+#define DECL_CONSTANT_STR(NAME, VALUE)                  \
+    DECL_CTR("DECL_CONSTANT_STR " NAME " " VALUE)
+
+// Declare an enumeration
+#define DECL_ENUMERATION(ENUM, NAME, VALUE)                             \
+    DECL_CTR_INT("DECL_ENUMERATION " ENUM " " NAME, 1, CTR_INT(VALUE))
+#define DECL_ENUMERATION_RANGE(ENUM, NAME, VALUE, COUNT)        \
+    DECL_CTR_INT("DECL_ENUMERATION_RANGE " ENUM " " NAME,       \
+                 2, CTR_INT(VALUE), CTR_INT(COUNT))
+
+#endif // ctr.h

src/generic/alloc.c

@@ -0,0 +1,23 @@
+// Generic implementation of dynamic memory pool
+//
+// Copyright (C) 2016,2017  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include "misc.h" // dynmem_start
+
+static char dynmem_pool[20 * 1024];
+
+// Return the start of memory available for dynamic allocations
+void *
+dynmem_start(void)
+{
+    return dynmem_pool;
+}
+
+// Return the end of memory available for dynamic allocations
+void *
+dynmem_end(void)
+{
+    return &dynmem_pool[sizeof(dynmem_pool)];
+}

src/generic/armcm_boot.c

@@ -0,0 +1,56 @@
+// ARM Cortex-M vector table and initial bootup handling
+//
+// Copyright (C) 2019  Kevin O'Connor <kevin@koconnor.net>
+//
+// This file may be distributed under the terms of the GNU GPLv3 license.
+
+#include "armcm_boot.h" // DECL_ARMCM_IRQ
+#include "autoconf.h" // CONFIG_MCU
+#include "board/internal.h" // SysTick
+
+
+// Symbols created by armcm_link.lds.S linker script
+extern uint32_t _data_start, _data_end, _data_flash;
+extern uint32_t _bss_start, _bss_end, _stack_start;
+extern uint32_t _stack_end;
+
+
+/****************************************************************
+ * Basic interrupt handlers
+ ****************************************************************/
+
+// Initial code entry point - invoked by the processor after a reset
+void
+ResetHandler(void)
+{
+    // Disable SysTick irq (for some bootloaders that don't)
+    SysTick->CTRL = SysTick_CTRL_CLKSOURCE_Msk;
+
+    // Copy global variables from flash to ram
+    uint32_t count = (&_data_end - &_data_start) * 4;
+    __builtin_memcpy(&_data_start, &_data_flash, count);
+
+    // Clear the bss segment
+    __builtin_memset(&_bss_start, 0, (&_bss_end - &_bss_start) * 4);
+
+    barrier();
+
+    // Initializing the C library isn't needed...
+    //__libc_init_array();
+
+    // Run the main board specific code
+    armcm_main();
+
+    // The armcm_main() call should not return
+    for (;;)
+        ;
+}
+DECL_ARMCM_IRQ(ResetHandler, -15);
+
+// Code called for any undefined interrupts
+void
+DefaultHandler(void)
+{
+    for (;;)
+        ;
+}