ST STM32L0x3 - Page 977

RM0367 Rev 7 977/1043
RM0367 Code examples
1020
/* (3) Enter in wait for interrupt. The EOP check is done in the Flash ISR
*/
/* (6) Reset the ERASE and DATA bits in the FLASH_PECR register
to disable the page erase */
FLASH->PECR |= FLASH_PECR_ERASE | FLASH_PECR_DATA; /* (1) */
*(__IO uint32_t *)addr = (uint32_t)0; /* (2) */
__WFI(); /* (3) */
FLASH->PECR &= ~(FLASH_PECR_ERASE | FLASH_PECR_DATA); /* (4) */
A.3.7 Program Option byte code example
/**
* This function programs a 16-bit option byte and its complement word.
* Param None
* Retval None
*/
__INLINE __RAM_FUNC void OptionByteProg(uint8_t index, uint16_t data)
{
/* (1) Write a 32-bit word value at the option byte address,
the 16-bit data is extended with its compemented value */
/* (3) Wait until the BSY bit is reset in the FLASH_SR register */
/* (4) Check the EOP flag in the FLASH_SR register */
/* (5) Clear EOP flag by software by writing EOP at 1 */
*(__IO uint32_t *)(OB_BASE + index) = (uint32_t)((~data << 16) | data);
/* (1) */
while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (2) */
{
/* For robust implementation, add here time-out management */
}
if ((FLASH->SR & FLASH_SR_EOP) != 0) /* (3) */
{
FLASH->SR = FLASH_SR_EOP; /* (4) */
}
else
{
/* Manage the error cases */
}
}
Note: This function must be loaded in RAM.
A.3.8 Erase Option byte code example
/**
* This function erases a 16-bit option byte and its complement
word.
* Param None