STM32L412 Internal Flash Write is not working

[Rajesh Kannan]

Hi ,

I am preparing flash the binary using the USB in STM32L412.

I checked STM32 USB DFU code. It is working only read. I couldn't write in the STMDFU application.

I tried to write to flash ,But i am getting HAL_ERROR and read the FLASH SR register shows 0xA8 ( Programming error)

Please help for flash write from bootloader code.

Please check below API for testing flash.

uint16_t MEM_Write_Flash_64(uint32_t address, uint8_t *dest)
{
  /* USER CODE BEGIN 3 */
uint32_t i = 0;
uint64_t WrBuffer64;
uint8_t WrBuffer16[8];
address = 0x0800C000;

/* Clear OPTVERR bit set on virgin samples */
__HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_OPTVERR);
//WrBuffer16[0] = (uint16_t)(dest[index]);
//WrBuffer16[1] = (uint16_t)(internalBuffer[index+1]);
//WrBuffer16[2] = (uint16_t)(internalBuffer[index+2]);
//WrBuffer16[3] = (uint16_t)(internalBuffer[index+3]);
  HAL_FLASH_Unlock();
  __HAL_FLASH_CLEAR_FLAG(FLASH_FLAG_ALL_ERRORS);
//WrBuffer64 = (uint64_t)(((dest[7])<<56) | ((dest[6])<<48) | ((dest[5])<<40) |((dest[4])<<32) |((dest[3])<<24) |((dest[2])<<16) |((dest[1])<<8) | dest[0]);
WrBuffer64 = A1A2A3A4A5A6A7A8;
if(HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD, address, WrBuffer64) == HAL_OK)
{
//address = address + 8;
}

return 1;
}

[Tesla DeLorean]

The address needs to be on an 8-byte boundary, and the FLASH memory you are writing too needs to have been erased. You can't rewrite to the same address more than once without erasing it first.