STM32L4S5 write data to 2MB flash memory (STM32CubeIDE)

Question

I am trying to write to the flash memory of the STM32L4S5QIIX microcontroller on the EVAL-ADIN1110EBZ development board. I have also tried similar code on an STM32L4S5VITX microcontroller on a custom circuit board.

Short example code:

uint32_t flash_memory_address = 0x08100000;
uint64_t flash_write_data = 0x12345678;
uint8_t flash_read_data[4]= {0};

HAL_FLASH_Unlock();
FLASH_PageErase(0, FLASH_BANK_2);
HAL_FLASH_Lock();

HAL_FLASH_Unlock();
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
HAL_StatusTypeDef status = HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD,
                                             flash_memory_address, 
                                             flash_write_data);
HAL_FLASH_Lock();

The full code and project files can be found at: https://github.com/landas/stm32l4s5-flash-memory/blob/e8304c3d17e27ee9f27f8a8243ceb7f73ba077bf/Core/Src/main.c#L135

HAL_FLASH_Program(...) returns the error codes:

HAL_FLASH_ERROR_PGA
HAL_FLASH_ERROR_PGS

I get similar code to work with a NUCLEO-F303RE develpoement board without any errors.

I would appreciate any hints on how to resolve this issue.

I can confirm that FLASH_PageErase(0, FLASH_BANK_2) successfully erases data. I used STM32CubeProgrammer to edit that memory area, and the data gets erased when this method is executed. — landas
– landas, Commented May 6 at 12:42

SamGibson · Accepted Answer · 2025-05-08 20:09:14Z

I got answer for this question here:

https://community.st.com/t5/stm32-mcus-products/stm32l4s5-write-data-to-2mb-flash-memory-stm32cubeide/m-p/800395#M278455

At the link above, STMicroelectronics Community member TDK posted:

Use HAL_FLASHEx_Erase to erase flash pages. FLASH_PageErase is not meant to be called from user programs, only HAL_* functions.

Here is an example project which erases and writes to flash:

STM32CubeL4/Projects/NUCLEO-L452RE/Examples/FLASH/FLASH_EraseProgram/Src/main.c at 874612f28ce541e585f253cdcfd434dd8eb94914 · STMicroelectronics/STM32CubeL4

The relevant code at that link is:

...
  /* Program the user Flash area word by word
    (area defined by FLASH_USER_START_ADDR and FLASH_USER_END_ADDR) ***********/

  Address = FLASH_USER_START_ADDR;

  while (Address < FLASH_USER_END_ADDR)
  {
    if (HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, Address, DATA_64) == HAL_OK)
    {
      Address = Address + 8;
    }
   else
    {
      /* Error occurred while writing data in Flash memory.
         User can add here some code to deal with this error */
      while (1)
      {
        /* Make LED2 blink (100ms on, 2s off) to indicate error in Write operation */
        BSP_LED_On(LED2);
        HAL_Delay(100);
        BSP_LED_Off(LED2);
        HAL_Delay(2000);
      }
    }
  }
...

landas - Hi, Thanks for coming back with the answer that you got on the STM forum. Answers here should not be link-only, since if that link dies in future, the answer becomes useless. Therefore I copied over what I think is the relevant information, with attribution to its author, and added that to your answer. You edit what I added to improve it, if needed, of course. — SamGibson
– SamGibson ♦, Commented May 8 at 20:15

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