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stm: Add comments for storage read from cache.

pull/72/head
Damien George 2014-01-04 12:34:36 +00:00
rodzic cb3b6ce7ae
commit 2a5e6538b9
1 zmienionych plików z 4 dodań i 1 usunięć
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5
stm/storage.c
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@ -53,8 +53,10 @@ 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)
if (cache_flash_sector_id == flash_sector_id) {
// in cache, copy from there
return (uint8_t*)CACHE_MEM_START_ADDR + flash_addr - flash_sector_start;
}
// not in cache, copy straight from flash
return (uint8_t*)flash_addr;
}
@ -141,6 +143,7 @@ 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, get data from flash memory, possibly via cache
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);