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cpu/sam0_common: add alignment and minimum size write block constants

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This commit is contained in:
kYc0o 2017-11-16 00:00:56 +01:00
parent fcb3fd9e70
commit adc08d6578
2 changed files with 15 additions and 10 deletions
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10
cpu/sam0_common/include/cpu_conf.h
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@ -42,9 +42,15 @@ extern "C" {
* @{
*/
/* a flashpage in RIOT is mapped to a flash row on the SAM0s */
#define FLASHPAGE_SIZE (256U)
#define FLASHPAGE_SIZE (256U)
/* one SAM0 row contains 4 SAM0 pages -> 4x the amount of RIOT flashpages */
#define FLASHPAGE_NUMOF (FLASH_NB_OF_PAGES / 4)
#define FLASHPAGE_NUMOF (FLASH_NB_OF_PAGES / 4)
/* The minimum block size which can be written is 16B. However, the erase
* block is always FLASHPAGE_SIZE (SAM0 row).
*/
#define FLASHPAGE_RAW_BLOCKSIZE (16)
/* Writing should be always 4 byte aligned */
#define FLASHPAGE_RAW_ALIGNMENT (4)
/** @} */
#ifdef __cplusplus

15
cpu/sam0_common/periph/flashpage.c
View File

@ -58,19 +58,18 @@ static void _lock(void)
void flashpage_write_raw(void *target_addr, void *data, size_t len)
{
/* sam[dlr]21 can only write whole flash pages.
* Mind the use of the ATMEL FLASH_PAGE_SIZE (64B) define vs.
* FLASHPAGE_SIZE (256B) as defined by RIOT.
* The actual minimal block size for writing is 16B, thus we
* assert we don't write less than that.
/* The actual minimal block size for writing is 16B, thus we
* assert we write on multiples and no less of that length.
*/
assert(!(len % (FLASH_PAGE_SIZE / 4)));
assert(!(len % FLASHPAGE_RAW_BLOCKSIZE));
/* ensure 4 byte aligned writes */
assert(!(((unsigned)target_addr & 0x3) || ((unsigned)data & 0x3)));
assert(!(((unsigned)target_addr % FLASHPAGE_RAW_ALIGNMENT) ||
((unsigned)data % FLASHPAGE_RAW_ALIGNMENT)));
/* ensure the length doesn't exceed the actual flash size */
assert((target_addr + len) < (CPU_FLASH_BASE + (FLASHPAGE_SIZE * FLASHPAGE_NUMOF)));
assert(((uint8_t*)target_addr + len) <
(CPU_FLASH_BASE + (FLASHPAGE_SIZE * FLASHPAGE_NUMOF)));
uint32_t *dst = (uint32_t *)target_addr;
uint32_t *data_addr = (uint32_t *)data;