SDMMC + STM32H723 not initializing SD Card

[diktril]

I am having difficulties with initializing a SD Card.

I am making use of the generated code to initialize the card:

void MX_SDMMC1_SD_Init(void)

 I measured with a scope and I am getting 400KHz clock. All the pull-up resistors are correct and voltage is correct.

Within the SD_PowerON() function, the function to send the MD8: SEND_IF_COND is called, but I get no response from the card. HAL Error Return is timeout.

I tried a differ SD Card as well.

Any suggestions where to start checking for potential issues?

static uint32_t SD_PowerON(SD_HandleTypeDef *hsd)
{
  __IO uint32_t count = 0U;
  uint32_t response = 0U;
  uint32_t validvoltage = 0U;
  uint32_t errorstate =0U;
#if (USE_SD_TRANSCEIVER != 0U)
  uint32_t tickstart = HAL_GetTick();
#endif /* USE_SD_TRANSCEIVER  */

  /* CMD0: GO_IDLE_STATE */
  errorstate = SDMMC_CmdGoIdleState(hsd->Instance);
  if (errorstate != HAL_SD_ERROR_NONE)
  {
    return errorstate;
  }

  /* CMD8: SEND_IF_COND: Command available only on V2.0 cards */
  errorstate = SDMMC_CmdOperCond(hsd->Instance);
  if (errorstate == SDMMC_ERROR_TIMEOUT) /* No response to CMD8 */
  {
    hsd->SdCard.CardVersion = CARD_V1_X;
    /* CMD0: GO_IDLE_STATE */
    errorstate = SDMMC_CmdGoIdleState(hsd->Instance);
    if (errorstate != HAL_SD_ERROR_NONE)
    {
      return errorstate;
    }

[GAA]

Hello,

Before proceeding further, please make sure that the pinout is correct

Br,

[diktril · Accepted solution]

Double checked all connections.

Measured voltage with scope and noticed ripple in supply.

Added a 10nF capacitor to supply voltage. All seems stable now.