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cpu/stm32_common/flashpage: force waiting for pending operations

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Moving the while loop in a separate function ensures no ordering
    optimizations is applied silently by gcc.
    This commit fixes the flashpage not working on iotlab-m3.
This commit is contained in:
Alexandre Abadie 2018-05-30 14:12:24 +02:00
parent c73ec5c00f
commit f7b61b6ac1
1 changed files with 13 additions and 5 deletions
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18
cpu/stm32_common/periph/flashpage.c
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@ -65,6 +65,12 @@ static void _unlock_flash(void)
#endif
}
static void _wait_for_pending_operations(void)
{
DEBUG("[flashpage] waiting for any pending operation to finish\n");
while (FLASH->SR & FLASH_SR_BSY) {}
}
static void _erase_page(void *page_addr)
{
#if defined(CPU_FAM_STM32L0) || defined(CPU_FAM_STM32L1)
@ -81,8 +87,8 @@ static void _erase_page(void *page_addr)
_unlock_flash();
/* make sure no flash operation is ongoing */
DEBUG("[flashpage] erase: waiting for any operation to finish\n");
while (FLASH->SR & FLASH_SR_BSY) {}
_wait_for_pending_operations();
/* set page erase bit and program page address */
DEBUG("[flashpage] erase: setting the erase bit\n");
CNTRL_REG |= FLASH_CR_PER;
@ -97,8 +103,9 @@ static void _erase_page(void *page_addr)
DEBUG("[flashpage] erase: trigger the page erase\n");
CNTRL_REG |= FLASH_CR_STRT;
#endif
DEBUG("[flashpage] erase: wait as long as device is busy\n");
while (FLASH->SR & FLASH_SR_BSY) {}
/* wait as long as device is busy */
_wait_for_pending_operations();
/* reset PER bit */
DEBUG("[flashpage] erase: resetting the page erase bit\n");
CNTRL_REG &= ~(FLASH_CR_PER);
@ -151,7 +158,8 @@ void flashpage_write_raw(void *target_addr, const void *data, size_t len)
for (size_t i = 0; i < (len / FLASHPAGE_DIV); i++) {
DEBUG("[flashpage_raw] writing %c to %p\n", (char)data_addr[i], dst);
*dst++ = data_addr[i];
while (FLASH->SR & FLASH_SR_BSY) {}
/* wait as long as device is busy */
_wait_for_pending_operations();
}
/* clear program bit again */