Getting started with STM32H750VBT6, SDMMC1

[JBond.1]

Hi, I am trying to move to STM32H750 from STM32F407. To start with I have tried making simple LED blink project and it seems to work.Then I add SDMMC1 and suddenly it started hanging on exiting `static void MX_GPIO_Init(void)`. Any ideas why? Do I need some kind of other initialization or what could be wrong?

/* Identify card operating voltage */
  errorstate = SD_PowerON(hsd);
  if (errorstate != HAL_SD_ERROR_NONE)
  {
    hsd->State = HAL_SD_STATE_READY;
    hsd->ErrorCode |= errorstate;
    return HAL_ERROR;
  }

it seems to return error here
0x10000000U
#define SDMMC_ERROR_UNSUPPORTED_FEATURE ((uint32_t)0x10000000U) /*!< Error when feature is not insupported */

what does that mean and how to fix it?

[JBond.1]

Inserting SD card worked. but my question is why do we have "Error_Handler();" on "MX_SDMMC1_SD_Init(void)" which is executed if there is no SD card inserted?

static void MX_SDMMC1_SD_Init(void)
{

  /* USER CODE BEGIN SDMMC1_Init 0 */

  /* USER CODE END SDMMC1_Init 0 */

  /* USER CODE BEGIN SDMMC1_Init 1 */

  /* USER CODE END SDMMC1_Init 1 */
  hsd1.Instance = SDMMC1;
  hsd1.Init.ClockEdge = SDMMC_CLOCK_EDGE_RISING;
  hsd1.Init.ClockPowerSave = SDMMC_CLOCK_POWER_SAVE_DISABLE;
  hsd1.Init.BusWide = SDMMC_BUS_WIDE_4B;
  hsd1.Init.HardwareFlowControl = SDMMC_HARDWARE_FLOW_CONTROL_DISABLE;
  hsd1.Init.ClockDiv = 30;
  if (HAL_SD_Init(&hsd1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SDMMC1_Init 2 */

  /* USER CODE END SDMMC1_Init 2 */

}

How do I skip "Error_Handler()" execution if card is not inserted? My board does not have "CardInsert" pin.
Crash if card is not inserted is not what user would expect.

[Saket_Om]

Hello @JBond.1 

The only possibility is to initialise SDMMC without CubeMX.