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Fix issue #62: Cache loses data 

Use the storage cache not only for writing but also for reading. This
avoids reading stale data and thus data loss.
This commit is contained in:
stevie67 2014-01-04 03:02:32 +01:00
parent c8d1384fc0
commit 2c62e262b2
1 changed files with 12 additions and 2 deletions
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14
stm/storage.c
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@ -49,6 +49,16 @@ static uint8_t *cache_get_addr_for_write(uint32_t flash_addr) {
return (uint8_t*)CACHE_MEM_START_ADDR + flash_addr - flash_sector_start;
}
static uint8_t *cache_get_addr_for_read(uint32_t flash_addr) {
uint32_t flash_sector_start;
uint32_t flash_sector_size;
uint32_t flash_sector_id = flash_get_sector_info(flash_addr, &flash_sector_start, &flash_sector_size);
if (cache_flash_sector_id == flash_sector_id)
return (uint8_t*)CACHE_MEM_START_ADDR + flash_addr - flash_sector_start;
// not in cache, copy straight from flash
return (uint8_t*)flash_addr;
}
void storage_init(void) {
if (!is_initialised) {
cache_flash_sector_id = 0;
@ -131,8 +141,8 @@ bool storage_read_block(uint8_t *dest, uint32_t block) {
return true;
} else if (FLASH_PART1_START_BLOCK <= block && block < FLASH_PART1_START_BLOCK + FLASH_PART1_NUM_BLOCKS) {
// non-MBR block, just copy straight from flash
uint8_t *src = (uint8_t*)FLASH_MEM_START_ADDR + (block - FLASH_PART1_START_BLOCK) * BLOCK_SIZE;
uint32_t flash_addr = FLASH_MEM_START_ADDR + (block - FLASH_PART1_START_BLOCK) * BLOCK_SIZE;
uint8_t *src = cache_get_addr_for_read(flash_addr);
memcpy(dest, src, BLOCK_SIZE);
return true;