Thank you for your advice.
I read reference manual and HAL API and tried some of programs.
But, My work hasn't been going well.
PG10 seemed to work, but the clk signal amplitude was lower(1Vpp) than expected(3Vpp).
On the other hand, PA8 output was 3Vpp clk signal, which freq. is the same as PG10.
I decided to use the [HAL_StatusTypeDef HAL_FLASHEx_OBProgram (FLASH_OBProgramInitTypeDef * pOBInit) ] API.
This example program is modified for my application.
->https://community.st.com/s/question/0D50X00009XkfPk/simple-example-program-to-read-and-write-option-bytes-on-stm32f042k6-using-hal-libraries
...........
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
FLASH_OBProgramInitTypeDef OBInit; // programming option structure
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
OBInit.OptionType = OPTIONBYTE_USER;
OBInit.USERType = OB_USER_NRST_MODE;
OBInit.USERConfig = OB_NRST_MODE_GPIO;
// unlock FLASH in general
if(HAL_FLASH_Unlock() == HAL_OK) {
// unlock option bytes in particular
if(HAL_FLASH_OB_Unlock() == HAL_OK) {
// erase option bytes before programming
// if(HAL_FLASHEx_OBErase() == HAL_OK) {
// program selected option byte
HAL_FLASHEx_OBProgram(&OBInit); // result not checked as there is no recourse at this point
if(HAL_FLASH_OB_Lock() == HAL_OK) {
HAL_FLASH_Lock(); // again, no recourse
HAL_FLASH_OB_Launch(); // reset occurs here (sorry, debugger)
}
// }
}
}
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
/* USER CODE BEGIN 2 */
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
}
/* USER CODE END 3 */
}
Do you have any suggestions?
Thank you.
