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Revert "Revert "STM32: Use hardware CRC unit"" 

This reverts commit 58abbf7fc7.
This commit is contained in:
Gareth McMullin 2013-04-14 11:28:46 -07:00
parent 58abbf7fc7
commit 7db6e3e00c
1 changed files with 28 additions and 0 deletions
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28
src/crc32.c
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@ -21,6 +21,7 @@
#include "platform.h"
#include "target.h"
#if !defined(STM32F1) && !defined(STM32F4)
static const uint32_t crc32_table[] = {
0x00000000, 0x04C11DB7, 0x09823B6E, 0x0D4326D9,
0x130476DC, 0x17C56B6B, 0x1A864DB2, 0x1E475005,
@ -107,4 +108,31 @@ uint32_t generic_crc32(struct target_s *target, uint32_t base, int len)
}
return crc;
}
#else
#include <libopencm3/stm32/crc.h>
uint32_t generic_crc32(struct target_s *target, uint32_t base, int len)
{
uint32_t data;
uint8_t byte;
CRC_CR |= CRC_CR_RESET;
while (len >3) {
if (target_mem_read_words(target, &data, base, 1) != 0)
return -1;
CRC_DR = data;
base+=4;
len -= 4;
}
while (len--) {
if (target_mem_read_bytes(target, &byte, base, 1) != 0)
return -1;
CRC_DR = byte;
base++;
}
return CRC_DR;
}
#endif