stm32f405RG eeprom emulation

[TCash.1]

Hello All,

I am trying to get eeprom emulation working on a stm32f405RG**.

I created a new simple project in STM32CubeIde using the eeprom code from the stm32f4cubeide packages. specifically I am using the code from STM32Cube_FW_F4_V1.25.0\Projects\STM32F401RE-Nucleo\Applications\EEPROM\EEPROM_Emulation

however I keep getting an error from the EE_Init() function below:

  /* 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 */
  /* Unlock the Flash Program Erase controller */
 HAL_FLASH_Unlock();
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  //MX_SPI2_Init();
  //MX_TIM3_Init();
  //MX_SPI3_Init();
  //MX_TIM4_Init();
  //MX_TIM5_Init();
  //MX_TIM8_Init();
  //MX_USART3_UART_Init();
  //MX_TIM2_Init();
  //MX_ADC1_Init();
  //MX_USART1_UART_Init();
  /* USER CODE BEGIN 2 */
 
 
  /* EEPROM Init */
  if( EE_Init() != EE_OK)
  {
    Error_Handler();
  }

I setup my virtual addresses the same as in the example:

uint16_t VirtAddVarTab[NB_OF_VAR] = {0x5555, 0x6666, 0x7777};
uint16_t VarDataTab[NB_OF_VAR] = {0, 0, 0};
uint16_t VarValue,VarDataTmp = 0;

I suspect it could be a problem because the code was made for STM32F401RE. But I think it should be similar....

Any Ideas or help would be appreciated.

Thanks,

Trevor

[KnarfB]

What is the error code? If you debug-step into EE_Init(), do you see what causes the error? When you ported to the other chip: did you check RAM+Flash sizes and layout in the linker file?

[TCash.1]

Hi KnarfB,

Here is my linker file MEMORY layout (STM32F405RGTX_FLASH.ld):

MEMORY
{
  RAM (xrw)               : ORIGIN = 0x20000000, LENGTH = 128K
  CCMRAM (rw)             : ORIGIN = 0x10000000, LENGTH = 64K
  FLASH_BOOT (rx)         : ORIGIN = 0x8000000, LENGTH = 32k
  EMULATED_EEPROM (rwx)   : ORIGIN = ORIGIN(FLASH_BOOT) + LENGTH(FLASH_BOOT), LENGTH = 32k
  FLASH (rx)              : ORIGIN = ORIGIN(EMULATED_EEPROM) + LENGTH(EMULATED_EEPROM), LENGTH = 1024k - LENGTH(FLASH_BOOT) - LENGTH(EMULATED_EEPROM)
}

EE_Init() is returning 128(dec) (PAGE_FULL), line 22 in the below snippit:

else /* Page0 valid, Page1 receive */
      {
        /* Transfer data from Page0 to Page1 */
        for (VarIdx = 0; VarIdx < NB_OF_VAR; VarIdx++)
        {
          if ((*(__IO uint16_t*)(PAGE1_BASE_ADDRESS + 6)) == VirtAddVarTab[VarIdx])
          {
            x = VarIdx;
          }
          if (VarIdx != x)
          {
            /* Read the last variables' updates */
            ReadStatus = EE_ReadVariable(VirtAddVarTab[VarIdx], &DataVar);
            /* In case variable corresponding to the virtual address was found */
            if (ReadStatus != 0x1)
            {
              /* Transfer the variable to the Page1 */
              EepromStatus = EE_VerifyPageFullWriteVariable(VirtAddVarTab[VarIdx], DataVar);
              /* If program operation was failed, a Flash error code is returned */
              if (EepromStatus != HAL_OK)
              {
                return EepromStatus;
              }
            }
          }
        }

In main.c, flashunlock is HAL_OK. which seems to mean the flash is unlocked.

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 */
  /* Unlock the Flash Program Erase controller */
  HAL_StatusTypeDef flashunlock = HAL_FLASH_Unlock();
 
  /* USER CODE END SysInit */
 
  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  //MX_SPI2_Init();

[TCash.1]

It looks like I was using to large of values (from the example 0x5555, 0x6666, 0x7777) for the virtual addresses. using virtual address 0x0,0x1,0x2, etc seems to be working for me.

[TCash.1]

UPDATE: The Above is really not the correct solution to the problem. I believe I am still getting errors.

To be clear I am trying to get eeprom emulation working on the both the f4 (above) and a stm32H7. right now I am working with the H7 again and am having trouble with the EE_VerifyPageFullWriteVariable function:

/* Check each active page address starting from begining */
  while (Address < PageEndAddress)
  {
 
    /* Verify if Address and Address+2 contents are 0xFFFFFFFF */
	__IO uint32_t* addressAsPointer = Address;
	uint32_t addressValue = (*addressAsPointer);
 
 
    if (addressValue == 0xFFFFFFFF)
    {
      /* Set variable data */
      FlashStatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_FLASHWORD, Address, ((uint32_t)data32));
   
      /* If program operation was failed, a Flash error code is returned */
      if (FlashStatus != HAL_OK)
      {
        return FlashStatus;
      }
      /* Set variable virtual address */
      FlashStatus = HAL_FLASH_Program(FLASH_TYPEPROGRAM_FLASHWORD, Address + 32, ((uint32_t)VirtAddress1));
 
      /* Return program operation status */
     return FlashStatus;
    }
    else
    {

 I get a hardfault when dereferencing the addressAsPointer variable. the address seems valid (its in flash range 0x81cb680) and the value is even extracted into the addressValue variable. non-theless I get a hardfault