最近调试emmc，发现stm32自带的文件stm32h7xx_hal_mmc.c,stm32f7xx_hal_mmc.c,stm32h4xx_hal_mmc.c就可以驱动。
在HAL_StatusTypeDef  HAL_MMC_Init(MMC_HandleTypeDef *hmmc)函数中加入适当延时：

HAL_StatusTypeDef HAL_MMC_Init(MMC_HandleTypeDef *hmmc)
{
  /* Check the MMC handle allocation */
  if(hmmc == NULL)
  {
    return HAL_ERROR;
  }

  /* Check the parameters */
  assert_param(IS_SDMMC_ALL_INSTANCE(hmmc->Instance));
  assert_param(IS_SDMMC_CLOCK_EDGE(hmmc->Init.ClockEdge));
  assert_param(IS_SDMMC_CLOCK_POWER_SAVE(hmmc->Init.ClockPowerSave));
  assert_param(IS_SDMMC_BUS_WIDE(hmmc->Init.BusWide));
  assert_param(IS_SDMMC_HARDWARE_FLOW_CONTROL(hmmc->Init.HardwareFlowControl));
  assert_param(IS_SDMMC_CLKDIV(hmmc->Init.ClockDiv));

  if(hmmc->State == HAL_MMC_STATE_RESET)
  {
    /* Allocate lock resource and initialize it */
    hmmc->Lock = HAL_UNLOCKED;
    /* Init the low level hardware : GPIO, CLOCK, CORTEX...etc */
    HAL_MMC_MspInit(hmmc);
  }

  hmmc->State = HAL_MMC_STATE_BUSY;

  /* Initialize the Card parameters */
  if(HAL_MMC_InitCard(hmmc) == HAL_ERROR)
  {
    return HAL_ERROR;
  }

  HAL_Delay(20);///////加入适当延时

  /* Configure the bus wide */
  if(HAL_MMC_ConfigWideBusOperation(hmmc, hmmc->Init.BusWide) == HAL_ERROR)
  {
    return HAL_ERROR;
  }
  
  /* Initialize the error code */
  hmmc->ErrorCode = HAL_DMA_ERROR_NONE;
  
  /* Initialize the MMC operation */
  hmmc->Context = MMC_CONTEXT_NONE;

  /* Initialize the MMC state */
  hmmc->State = HAL_MMC_STATE_READY;

  return HAL_OK;
}