bootentry: Breakup canboot_main.c to flashcmd.c, bootentry.c, and sched.c

Move command handlers from canboot_main.c to flashcmd.c.  Move startup
code to sched.c.  Rename remaining bootloader entry code to new
bootentry.c file.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/Makefile

@@ -1,4 +1,4 @@
 # Main code build rules
 
-src-y += canboot_main.c sched.c command.c flashcmd.c
+src-y += sched.c bootentry.c command.c flashcmd.c
 src-$(CONFIG_ENABLE_LED) += led.c

src/bootentry.c

@@ -1,4 +1,4 @@
-// Canboot main event loop
+// Determine if the bootloader or application should start
 //
 // Copyright (C) 2021 Eric Callahan <arksine.code@gmail.com>
 //
@@ -9,61 +9,11 @@
 #include "board/misc.h"     // udelay
 #include "board/flash.h"    // flash_read_block
 #include "board/gpio.h"     // gpio_in_setup
-#include "canboot_main.h"   // canboot_main
-#include "command.h"        // command_respond_ack
+#include "bootentry.h"      // bootentry_check
 #include "ctr.h"            // DECL_CTR
-#include "byteorder.h"      // cpu_to_le32
-#include "sched.h"          // sched_run_init
 
 #define REQUEST_SIG    0x5984E3FA6CA1589B // Random request sig
 
-static uint8_t complete;
-static uint32_t complete_endtime;
-
-void
-command_complete(uint32_t *data)
-{
-    uint32_t out[3];
-    command_respond_ack(CMD_COMPLETE, out, ARRAY_SIZE(out));
-    complete = 1;
-    complete_endtime = timer_read_time() + timer_from_us(100000);
-}
-
-void
-complete_task(void)
-{
-    if (complete && timer_is_before(complete_endtime, timer_read_time()))
-        jump_to_application();
-}
-DECL_TASK(complete_task);
-
-void
-command_connect(uint32_t *data)
-{
-    uint32_t mcuwords = DIV_ROUND_UP(strlen(CONFIG_MCU), 4);
-    uint32_t out[6 + mcuwords];
-    memset(out, 0, (6 + mcuwords) * 4);
-    out[2] = cpu_to_le32(PROTO_VERSION);
-    out[3] = cpu_to_le32(CONFIG_APPLICATION_START);
-    out[4] = cpu_to_le32(CONFIG_BLOCK_SIZE);
-    memcpy(&out[5], CONFIG_MCU, strlen(CONFIG_MCU));
-    command_respond_ack(CMD_CONNECT, out, ARRAY_SIZE(out));
-}
-
-static inline uint8_t
-check_application_code(void)
-{
-    // Read the first block of memory, if it
-    // is all 0xFF then no application has been flashed
-    uint8_t buf[CONFIG_BLOCK_SIZE];
-    flash_read_block(CONFIG_APPLICATION_START, (uint32_t*)buf);
-    for (uint8_t i = 0; i < CONFIG_BLOCK_SIZE; i++) {
-        if (buf[i] != 0xFF)
-            return 1;
-    }
-    return 0;
-}
-
 // Generated by buildcommands.py
 DECL_CTR("DECL_BUTTON " __stringify(CONFIG_BUTTON_PIN));
 extern int32_t button_gpio, button_high, button_pullup;
@@ -93,22 +43,23 @@ check_double_reset(void)
     // No reset, read the key back out to clear it
 }
 
-
-/****************************************************************
- * Startup
- ****************************************************************/
-static void
-enter_bootloader(void)
+static uint8_t
+check_application_code(void)
 {
-    sched_run_init();
-
-    for (;;)
-        sched_run_tasks();
+    // Read the first block of memory, if it
+    // is all 0xFF then no application has been flashed
+    uint8_t buf[CONFIG_BLOCK_SIZE];
+    flash_read_block(CONFIG_APPLICATION_START, (uint32_t*)buf);
+    for (uint8_t i = 0; i < CONFIG_BLOCK_SIZE; i++) {
+        if (buf[i] != 0xFF)
+            return 1;
+    }
+    return 0;
 }
 
-// Main loop of program
-void
-canboot_main(void)
+// Check if bootloader or application should be started
+int
+bootentry_check(void)
 {
     // Enter the bootloader in the following conditions:
     // - The request signature is set in memory (request from app)
@@ -116,11 +67,12 @@ canboot_main(void)
     uint64_t bootup_code = get_bootup_code();
     if (bootup_code == REQUEST_SIG || !check_application_code()
         || check_button_pressed()) {
+        // Start bootloader main loop
         set_bootup_code(0);
-        enter_bootloader();
+        return 1;
     }
     check_double_reset();
 
     // jump to app
-    jump_to_application();
+    return 0;
 }

src/bootentry.h

@@ -0,0 +1,6 @@
+#ifndef __BOOTENTRY_H
+#define __BOOTENTRY_H
+
+int bootentry_check(void);
+
+#endif // bootentry.h

src/canboot_main.h

@@ -1,6 +0,0 @@
-#ifndef __CANBOOT_MAIN_H
-#define __CANBOOT_MAIN_H
-
-void canboot_main(void);
-
-#endif // canboot_main.h

src/flashcmd.c

@@ -7,9 +7,55 @@
 #include <string.h> // memmove
 #include "autoconf.h" // CONFIG_BLOCK_SIZE
 #include "board/flash.h" // flash_write_page
+#include "board/misc.h" // jump_to_application
 #include "byteorder.h" // cpu_to_le32
 #include "command.h" // command_respond_ack
 #include "flashcmd.h" // flashcmd_is_in_transfer
+#include "sched.h" // DECL_TASK
+
+// Handler for "connect" commands
+void
+command_connect(uint32_t *data)
+{
+    uint32_t mcuwords = DIV_ROUND_UP(strlen(CONFIG_MCU), 4);
+    uint32_t out[6 + mcuwords];
+    memset(out, 0, (6 + mcuwords) * 4);
+    out[2] = cpu_to_le32(PROTO_VERSION);
+    out[3] = cpu_to_le32(CONFIG_APPLICATION_START);
+    out[4] = cpu_to_le32(CONFIG_BLOCK_SIZE);
+    memcpy(&out[5], CONFIG_MCU, strlen(CONFIG_MCU));
+    command_respond_ack(CMD_CONNECT, out, ARRAY_SIZE(out));
+}
+
+
+/****************************************************************
+ * Command "complete" handling
+ ****************************************************************/
+
+static uint8_t complete;
+static uint32_t complete_endtime;
+
+void
+command_complete(uint32_t *data)
+{
+    uint32_t out[3];
+    command_respond_ack(CMD_COMPLETE, out, ARRAY_SIZE(out));
+    complete = 1;
+    complete_endtime = timer_read_time() + timer_from_us(100000);
+}
+
+void
+complete_task(void)
+{
+    if (complete && timer_is_before(complete_endtime, timer_read_time()))
+        jump_to_application();
+}
+DECL_TASK(complete_task);
+
+
+/****************************************************************
+ * Flash commands
+ ****************************************************************/
 
 static uint8_t page_buffer[CONFIG_MAX_FLASH_PAGE_SIZE];
 // Page Tracking

src/sched.c

@@ -5,6 +5,8 @@
 // This file may be distributed under the terms of the GNU GPLv3 license.
 
 #include "board/io.h" // readb
+#include "board/misc.h" // jump_to_application
+#include "bootentry.h" // bootentry_check
 #include "sched.h" // sched_check_periodic
 
 // Note that a task is ready to run
@@ -24,18 +26,20 @@ sched_check_wake(struct task_wake *w)
     return 1;
 }
 
+// Init followed by main task dispatch loop
 void
-sched_run_init(void)
+sched_main(void)
 {
+    if (!bootentry_check())
+        jump_to_application();
+
     // Run all init functions marked with DECL_INIT()
     extern void ctr_run_initfuncs(void);
     ctr_run_initfuncs();
-}
 
-void
-sched_run_tasks(void)
-{
-    // Run all task functions marked with DECL_TASK()
-    extern void ctr_run_taskfuncs(void);
-    ctr_run_taskfuncs();
+    for (;;) {
+        // Run all task functions marked with DECL_TASK()
+        extern void ctr_run_taskfuncs(void);
+        ctr_run_taskfuncs();
+    }
 }

src/sched.h

@@ -19,8 +19,7 @@ struct task_wake {
 // sched.c
 void sched_wake_task(struct task_wake *w);
 uint8_t sched_check_wake(struct task_wake *w);
-void sched_run_init(void);
-void sched_run_tasks(void);
+void sched_main(void);
 
 // Compiler glue for DECL_X macros above.
 #define _DECL_CALLLIST(NAME, FUNC)                                      \

src/stm32/stm32f0.c

@@ -7,9 +7,9 @@
 #include "autoconf.h" // CONFIG_CLOCK_REF_FREQ
 #include "board/armcm_boot.h" // armcm_main
 #include "board/irq.h" // irq_disable
-#include "board/misc.h" // jump_to_application
+#include "board/misc.h" // timer_init
 #include "internal.h" // enable_pclock
-#include "canboot_main.h" // sched_main
+#include "sched.h" // sched_main
 
 #define FREQ_PERIPH 48000000
 
@@ -113,5 +113,5 @@ armcm_main(void)
 #endif
 
     timer_init();
-    canboot_main();
+    sched_main();
 }

src/stm32/stm32f1.c

@@ -8,8 +8,7 @@
 #include "board/armcm_boot.h" // VectorTable
 #include "board/irq.h" // irq_disable
 #include "internal.h" // enable_pclock
-#include "board/misc.h"     // jump_to_application
-#include "canboot_main.h" // canboot_main
+#include "sched.h" // sched_main
 
 #define FREQ_PERIPH (CONFIG_CLOCK_FREQ / 2)
 
@@ -235,5 +234,5 @@ armcm_main(void)
         stm32f1_alternative_remap(AFIO_MAPR_SWJ_CFG_Msk,
                                   AFIO_MAPR_SWJ_CFG_JTAGDISABLE);
 
-    canboot_main();
+    sched_main();
 }