Flash Emulation read write crashes program STM32L412

[MikeLemon]

Hello, 

I try to write some user parameters to the non volatile memory of the program like using an EEProm , trying to read or wrote to say memory address 0x08019000 keeps crashing my program and debugger when reading / writing from it.

I see from the memory scan with the debugger that address  0x08019000 did infact get written by luck in one of my many attemps today but still can't read / write to it realy.

Here are the base functions I use:

```

uint32_t flashWriteData(uint32_t Address, uint64_t data){

  HAL_FLASH_Unlock();

  FLASH_EraseInitTypeDef EraseInitStruct;

  EraseInitStruct.TypeErase = FLASH_TYPEERASE_PAGES;

  // EraseInitStruct.Banks = FLASH_BANK_1; // ?

  EraseInitStruct.Page = Address;

  // EraseInitStruct.NbPages = 1;

  uint32_t PageError;

  if (HAL_FLASHEx_Erase(&EraseInitStruct, &PageError) != HAL_OK)    //Erase the Page Before a Write Operation

      return HAL_ERROR;

  // HAL_Delay(50);

  HAL_FLASH_Program(FLASH_TYPEPROGRAM_DOUBLEWORD,Address,(uint64_t)data); // FLASH_TYPEPROGRAM_DOUBLEWORD FLASH_TYPEPROGRAM_WORD

  HAL_Delay(50);

  HAL_FLASH_Lock();

}

uint32_t flashReadData(uint32_t Address){

  __IO uint32_t read_data = *(__IO uint32_t *)Address;

  return (uint32_t)read_data;

}

```

Useage:

```

  uint32_t *MyData;

  MyData = flashReadData(0x08019000);

  printf("My Data = %d\n", *MyData);

  if(MyData == 55){

    printf("Variable has already been written to\n");

  }

  else{

    printf("Was %llu Now Writing to variable\n", MyData);

    uint64_t MyWriteData = 55;

    flashWriteData(0x08019000, MyWriteData);

  }

  uint32_t *MyReadData = flashReadData(0x08019000);

  printf("My Read Data = %d\n", *MyReadData);

```

and the mcu I use https://www.digikey.co.il/en/products/detail/stmicroelectronics/STM32L412CBT6/9656217 

Any idea what am I doing wrong

[Mkotb]

@MikeLemon  Did you find away for this, as I'm facing the same issue ?

[liaifat85]

You can try this way.

uint32_t MyData;
MyData = flashReadData(0x08019000);

printf("My Data = %lu\n", MyData);

if (MyData == 55) {
    printf("Variable has already been written to\n");
} else {
    printf("Was %lu. Now Writing to variable\n", MyData);
    uint64_t MyWriteData = 55;
    flashWriteData(0x08019000, MyWriteData);
}

MyData = flashReadData(0x08019000);

printf("My Read Data = %lu\n", MyData);

[Mkotb]

@liaifat85 and what about flashWriteData and flashReadData, are they the same as up or what ?