F0系列需要的,后来的F4等系列,可以写选项字节寄存器时自动擦除。
[C] 纯文本查看 复制代码 /**
* @brief Erases the FLASH option bytes.
* @note This functions erases all option bytes except the Read protection (RDP).
* The function @ref HAL_FLASH_Unlock() should be called before to unlock the FLASH interface
* The function @ref HAL_FLASH_OB_Unlock() should be called before to unlock the options bytes
* The function @ref HAL_FLASH_OB_Launch() should be called after to force the reload of the options bytes
* (system reset will occur)
* @retval HAL status
*/
HAL_StatusTypeDef HAL_FLASHEx_OBErase(void)
{
uint8_t rdptmp = OB_RDP_LEVEL_0;
HAL_StatusTypeDef status = HAL_ERROR;
/* Get the actual read protection Option Byte value */
rdptmp = FLASH_OB_GetRDP();
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
if(status == HAL_OK)
{
/* Clean the error context */
pFlash.ErrorCode = HAL_FLASH_ERROR_NONE;
/* If the previous operation is completed, proceed to erase the option bytes */
SET_BIT(FLASH->CR, FLASH_CR_OPTER);
SET_BIT(FLASH->CR, FLASH_CR_STRT);
/* Wait for last operation to be completed */
status = FLASH_WaitForLastOperation((uint32_t)FLASH_TIMEOUT_VALUE);
/* If the erase operation is completed, disable the OPTER Bit */
CLEAR_BIT(FLASH->CR, FLASH_CR_OPTER);
if(status == HAL_OK)
{
/* Restore the last read protection Option Byte value */
status = FLASH_OB_RDP_LevelConfig(rdptmp);
}
}
/* Return the erase status */
return status;
} |