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generic: add crc16 from klipper

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Signed-off-by:  Eric Callahan <arksine.code@gmail.com>
This commit is contained in:
Eric Callahan 2022-05-05 17:17:40 -04:00 committed by Eric Callahan
parent 849b81dce5
commit 011d3a8f45
3 changed files with 25 additions and 1 deletions
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22
src/generic/crc16_ccitt.c Normal file
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@ -0,0 +1,22 @@
// Code for crc16_ccitt
//
// Copyright (C) 2016 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "misc.h" // crc16_ccitt
// Implement the standard crc "ccitt" algorithm on the given buffer
uint16_t
crc16_ccitt(uint8_t *buf, uint_fast8_t len)
{
uint16_t crc = 0xffff;
while (len--) {
uint8_t data = *buf++;
data ^= crc & 0xff;
data ^= data << 4;
crc = ((((uint16_t)data << 8) | (crc >> 8)) ^ (uint8_t)(data >> 4)
^ ((uint16_t)data << 3));
}
return crc;
}

2
src/generic/misc.h
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@ -18,4 +18,6 @@ uint8_t timer_is_before(uint32_t time1, uint32_t time2);
uint32_t timer_read_time(void);
void udelay(uint32_t usecs);
uint16_t crc16_ccitt(uint8_t *buf, uint_fast8_t len);
#endif // misc.h

2
src/stm32/Makefile
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@ -25,7 +25,7 @@ $(OUT)canboot.elf: $(OUT)src/generic/armcm_link.ld
# Add source files
src-y += stm32/gpio.c stm32/flash.c stm32/clockline.c
src-y += generic/armcm_boot.c generic/armcm_irq.c
src-y += generic/armcm_boot.c generic/armcm_irq.c generic/crc16_ccitt.c
src-$(CONFIG_MACH_STM32F0) += ../lib/stm32f0/system_stm32f0xx.c
src-$(CONFIG_MACH_STM32F0) += stm32/stm32f0.c stm32/stm32f0_timer.c
src-$(CONFIG_MACH_STM32F0) += stm32/gpioperiph.c