ST STM32L0x3 User Manual

Code examples RM0367
978/1043 RM0367 Rev 7
* Retval None
*/
__INLINE __RAM_FUNC void OptionByteErase(uint8_t index)
{
/* (1) Set the ERASE bit in the FLASH_PECR register
to enable option byte erasing */
/* (2) Write a 32-bit word value at the option byte address to be erased
to start the erase sequence */
/* (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 */
/* (6) Reset the ERASE and PROG bits in the FLASH_PECR register
to disable the page erase */
FLASH->PECR |= FLASH_PECR_ERASE; /* (1) */
*(__IO uint32_t *)(OB_BASE + index) = 0; /* (2) */
while ((FLASH->SR & FLASH_SR_BSY) != 0) /* (3) */
{
/* For robust implementation, add here time-out management */
}
if ((FLASH->SR & FLASH_SR_EOP) != 0) /* (4) */
{
FLASH->SR |= FLASH_SR_EOP; /* (5) */
}
else
{
/* Manage the error cases */
}
FLASH->PECR &= ~(FLASH_PECR_ERASE); /* (6) */
}
Note: This function must be loaded in RAM.
A.3.9 Program a single word to Flash program memory code example
/* (1) Perform the data write (32-bit word) at the desired address */
/* (2) Wait until the BSY bit is reset in the FLASH_SR register */
/* (3) Check the EOP flag in the FLASH_SR register */
/* (4) clear it by software by writing it at 1 */
*(__IO uint32_t*)(flash_addr) = 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) */

ST STM32L0x3 Specifications

General

Brand	ST
Model	STM32L0x3
Category	Microcontrollers
Language	English