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fix: checksum

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TT 2020-02-23 11:36:05 +09:00
parent 681272c253
commit c89cd36f19
1 changed files with 3 additions and 4 deletions
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7
flash.c
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@ -64,7 +64,7 @@ void flash_unlock(void)
FLASH->KEYR = 0xCDEF89AB; FLASH->KEYR = 0xCDEF89AB;
} }
#define rotate(x) ((x<<1) | (x&(1<<31)?1:0)) #define rotate(x) (((x)<<1) | ((x)&(1<<31)?1:0))
static uint32_t static uint32_t
checksum(const void *start, size_t len) checksum(const void *start, size_t len)
@ -73,7 +73,7 @@ checksum(const void *start, size_t len)
uint32_t *tail = (uint32_t*)(start + len); uint32_t *tail = (uint32_t*)(start + len);
uint32_t value = 0; uint32_t value = 0;
while (p < tail) while (p < tail)
value = rotate(value) | *p++; value = rotate(value) + *p++;
return value; return value;
} }
@ -142,8 +142,7 @@ caldata_save(int id)
dst = (uint16_t*)saveareas[id]; dst = (uint16_t*)saveareas[id];
current_props.magic = CONFIG_MAGIC; current_props.magic = CONFIG_MAGIC;
current_props.checksum = 0; current_props.checksum = checksum(&current_props, sizeof current_props - sizeof current_props.checksum);
current_props.checksum = checksum(&current_props, sizeof current_props);
flash_unlock(); flash_unlock();