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Revert "STM32: Use hardware CRC unit" 

This reverts commit 32b909067b.

This CRC routine doesn't work.  The bit order used by the
STM32 CRC unit is reveresed from what GDB uses.
This commit is contained in:
Gareth McMullin 2013-04-04 21:37:51 -07:00
parent 61d464bf09
commit 58abbf7fc7
1 changed files with 0 additions and 28 deletions
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28
src/crc32.c
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@ -21,7 +21,6 @@
#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,
@ -108,31 +107,4 @@ 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