MX_FLASH_Init does not launch option bytes loading

[continuum]

MCU: STM32H563VITx

Stm32CubeMX version: 6.14.0

HAL Driver version: 1.5.0

When I enable EDATA option bytes in CubeMX, it generates the following code: 

void MX_FLASH_Init(void)
{

  /* USER CODE BEGIN FLASH_Init 0 */

  /* USER CODE END FLASH_Init 0 */

  FLASH_OBProgramInitTypeDef pOBInit = {0};

  /* USER CODE BEGIN FLASH_Init 1 */

  /* USER CODE END FLASH_Init 1 */
  if (HAL_FLASH_Unlock() != HAL_OK)
  {
    Error_Handler();
  }

  /* Option Bytes settings */

  if (HAL_FLASH_OB_Unlock() != HAL_OK)
  {
    Error_Handler();
  }
  pOBInit.OptionType = OPTIONBYTE_EDATA;
  pOBInit.Banks = FLASH_BANK_2;
  pOBInit.EDATASize = 2;
  if (HAL_FLASHEx_OBProgram(&pOBInit) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_FLASH_OB_Lock() != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_FLASH_Lock() != HAL_OK)
  {
    Error_Handler();
  }

  /* Launch Option Bytes Loading */
  /*HAL_FLASH_OB_Launch(); */

  /* USER CODE BEGIN FLASH_Init 2 */

  /* USER CODE END FLASH_Init 2 */

}​

The function does not launch option bytes loading. The 41st line suggests that just uncommenting it should enable it but this is misleading. Running `HAL_FLASH_OB_Launch` after `HAL_FLASH_Lock` will fail as the `HAL_FLASH_OB_Launch` function does not unlock flash option bytes. The function should be placed before `

HAL_FLASH_OB_Lock` or the flash option bytes should be unlocked again. 

[KDJEM.1]

Hello @continuum;

Could you please try with sequence and let me know if the issue is solved or not?

  if (HAL_FLASHEx_OBProgram(&FLASH_OBInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  /* Start option byte load operation after successful programming operation */
  HAL_FLASH_OB_Launch();

  /* Lock the Flash to disable the flash control register access (recommended
     to protect the FLASH memory against possible unwanted operation)
  */
  HAL_FLASH_Lock();

  /* Lock the Flash control option to restrict register access */
  HAL_FLASH_OB_Lock();

Also, I recommend you to look at STM32CubeH5/Projects/NUCLEO-H563ZI/Examples/FLASH/FLASH_EDATA_EraseProgram at main · STMicroelectronics/STM32CubeH5 · GitHub example may help you to check your code.

I hope this help you.

Thank you.

Kaouthar

[KDJEM.1]

Hello @continuum ;

Any update about the issue?

If your issue is solved,  please click on Accept as Solution on the reply which solved your issue.

Thank you.

Kaouthar

[continuum]

Hi @KDJEM.1 

Your solution probably works. I had it already figured out. My problem is how CubeMX generates the code. The commented out line with 

HAL_FLASH_OB_Launch

suggests that uncommenting this should apply option bytes which is not the case. Also, there is no user code block before HAL_FLASH_Lock where the user can place this line. 

[KDJEM.1]

Hello @continuum ;

I reported the STM32CubeMX issue internally for checking and fixing.

Internal ticket number is reported : 218539 (This is an internal tracking number and is not accessible or usable by customers).

Thank you for reporting this issue and for your contribution in STCommunity.

Kaouthar