CODEWITHSUNDEEP
sd-cardhalstm32h7
Archon
Archon

Reputation: 636

SDMMC not working on STM32H7 uControllers

Good day

The problem

I am trying to get an SD card working using an STM32H7 uController. I have in the past successfully integrated SDIO with STM32F4/F7 microcontroller but cannot get it to work on an H7 microcontroller.

Env

CubeMx V6.11.1 for code generation

What I have tried:

Wiring & hardware:

I have double check and triple checked that my wiring is correct. I am using a Nucleo-H723ZG board with a SD breakout and some jumpers. Nothing special. Jumpers are ~10cm long, so nothing outrageous there. I have also tried a variety of different SD cards with no success. I have even tried a different sd breakout board with no success either.

CubeMX:

  1. Configure RCC with correct HSE and LSE
  2. Configure CPU clock to 550MHz with DIVQ1->PLL1Q set to 183.333MHz
  3. Enable SDMMC1 with "SD 4 bits Wide bus"
  4. Set SDMMC clock divide factor to 2 and enable NVIC interrupt
  5. Enable FATFS middleware with "SD Card" checkbox
  6. Set defines: Increase Max_ss to 4096
  7. Advanced Settings: Enable "Use dma template"
  8. Platform Settings: Select P0 as the Detect_SDIO pin.

Firmware:

I have removed everything I that worked for me such as f_mount(), etc. None of it worked and reduced it to: (all of main.c is otherwise unaltered)

int main(void)
{

  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MPU Configuration--------------------------------------------------------*/
  MPU_Config();

  /* 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 */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_SDMMC1_SD_Init();
  MX_FATFS_Init();
  /* USER CODE BEGIN 2 */
  HAL_StatusTypeDef result_sd_init = HAL_SD_Init(&hsd1);

  FRESULT result_mount = f_mount(&SDFatFS, (TCHAR const*)SDPath, 1);

  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
  while (1)
  {
    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

Following the code and stepping into it I arrive at: sd_diskio.c line 220:

DRESULT SD_read(BYTE lun, BYTE *buff, DWORD sector, UINT count)
{
...
  while((ReadStatus == 0) && ((HAL_GetTick() - timeout) < SD_TIMEOUT))
  {
  }
  /* in case of a timeout return error */
  if (ReadStatus == 0)
  {
    res = RES_ERROR;
  }
...
}

Heyre the code hangs in the while loop until the timeout is triggered.

Anyone got any ideas? What am I missing....what is different from F4/F7 uControllers?

Upvotes: 0

Views: 536

Answers (1)

Archon
Archon

Reputation: 636

After several days of debugging I finally stumbled onto the solution after uselessly trying SDMMC1 and 2, FreeRTOS, Cache settings, DMA settings and just about anything I could think of.

As a last ditch effort pulled my SD card out of another device knowing it was a different SD card. And boom! It works.

I have 3 different SanDisk SD cards, none of which work! Not one. The other no name SD card that I tried works great. Not sure what to make of that. Note that the SandDisk SD cards work just fine on my PC. They just dont work using SDMMC on STM32

Upvotes: 0

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