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AP_Bootloader: use crc32_small()

This commit is contained in:
Andrew Tridgell 2019-10-27 22:54:10 +11:00
parent 1ec921560e
commit 31f7a62cdc
1 changed files with 2 additions and 33 deletions
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35
Tools/AP_Bootloader/bl_protocol.cpp
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@ -41,6 +41,7 @@
#include <AP_HAL/AP_HAL.h>
#include <AP_Math/AP_Math.h>
#include <AP_Math/crc.h>
#include "ch.h"
#include "hal.h"
#include "hwdef.h"
@ -319,38 +320,6 @@ cout_word(uint32_t val)
cout((uint8_t *)&val, 4);
}
static uint32_t
crc32(const uint8_t *src, unsigned len, unsigned state)
{
static uint32_t crctab[256];
/* check whether we have generated the CRC table yet */
/* this is much smaller than a static table */
if (crctab[1] == 0) {
for (unsigned i = 0; i < 256; i++) {
uint32_t c = i;
for (unsigned j = 0; j < 8; j++) {
if (c & 1) {
c = 0xedb88320U ^ (c >> 1);
} else {
c = c >> 1;
}
}
crctab[i] = c;
}
}
for (unsigned i = 0; i < len; i++) {
state = crctab[(state ^ src[i]) & 0xff] ^ (state >> 8);
}
return state;
}
/*
we use a write buffer for flashing, both for efficiency and to
ensure that we only ever do 32 byte aligned writes on STM32H7. If
@ -732,7 +701,7 @@ bootloader(unsigned timeout)
} else {
bytes = flash_func_read_word(p);
}
sum = crc32((uint8_t *)&bytes, sizeof(bytes), sum);
sum = crc32_small(sum, (uint8_t *)&bytes, sizeof(bytes));
}
cout_word(sum);