SDEx

SD Extended HAL module driver. More...

Modules
	SDEx Exported Functions

Functions
uint32_t	SD_HighSpeed (SD_HandleTypeDef *hsd)
	Switches the SD card to High Speed mode. This API must be used after "Transfer State". More...

Detailed Description

SD Extended HAL module driver.

Function Documentation

SD_HighSpeed()

uint32_t SD_HighSpeed

(

SD_HandleTypeDef *

hsd

)

Switches the SD card to High Speed mode. This API must be used after "Transfer State".

Note

This operation should be followed by the configuration of PLL to have SDMMCCK clock between 50 and 120 MHz

Parameters

hsd

SD handle

Return values

SD	Card error state

Definition at line 4044 of file stm32l4xx_hal_sd.c.

{
  uint32_t errorstate = HAL_SD_ERROR_NONE;
  SDMMC_DataInitTypeDef sdmmc_datainitstructure;
  uint32_t SD_hs[16]  = {0};
  uint32_t count, loop = 0 ;
  uint32_t Timeout = HAL_GetTick();

  if(hsd->SdCard.CardSpeed == CARD_NORMAL_SPEED)
  {
     /* Standard Speed Card <= 12.5Mhz  */
     return HAL_SD_ERROR_REQUEST_NOT_APPLICABLE;
  }

  if(hsd->SdCard.CardSpeed == CARD_HIGH_SPEED)
  {
    /* Initialize the Data control register */
    hsd->Instance->DCTRL = 0;
    errorstate = SDMMC_CmdBlockLength(hsd->Instance, 64);

    if (errorstate != HAL_SD_ERROR_NONE)
    {
      return errorstate;
    }

    /* Configure the SD DPSM (Data Path State Machine) */
    sdmmc_datainitstructure.DataTimeOut   = SDMMC_DATATIMEOUT;
    sdmmc_datainitstructure.DataLength    = 64;
    sdmmc_datainitstructure.DataBlockSize = SDMMC_DATABLOCK_SIZE_64B ;
    sdmmc_datainitstructure.TransferDir   = SDMMC_TRANSFER_DIR_TO_SDMMC;
    sdmmc_datainitstructure.TransferMode  = SDMMC_TRANSFER_MODE_BLOCK;
    sdmmc_datainitstructure.DPSM          = SDMMC_DPSM_ENABLE;

    if ( SDMMC_ConfigData(hsd->Instance, &sdmmc_datainitstructure) != HAL_OK)
    {
      return (HAL_SD_ERROR_GENERAL_UNKNOWN_ERR);
    }


    errorstate = SDMMC_CmdSwitch(hsd->Instance,SDMMC_SDR25_SWITCH_PATTERN);
    if(errorstate != HAL_SD_ERROR_NONE)
    {
      return errorstate;
    }

    while(!__HAL_SD_GET_FLAG(hsd, SDMMC_FLAG_RXOVERR | SDMMC_FLAG_DCRCFAIL | SDMMC_FLAG_DTIMEOUT | SDMMC_FLAG_DBCKEND| SDMMC_FLAG_DATAEND ))
    {
      if (__HAL_SD_GET_FLAG(hsd, SDMMC_FLAG_RXFIFOHF))
      {
        for (count = 0U; count < 8U; count++)
        {
          SD_hs[(8U*loop)+count]  = SDMMC_ReadFIFO(hsd->Instance);
        }
        loop ++;
      }

      if((HAL_GetTick()-Timeout) >=  SDMMC_DATATIMEOUT)
      {
        hsd->ErrorCode = HAL_SD_ERROR_TIMEOUT;
        hsd->State= HAL_SD_STATE_READY;
        return HAL_SD_ERROR_TIMEOUT;
      }
    }

    if (__HAL_SD_GET_FLAG(hsd, SDMMC_FLAG_DTIMEOUT))
    {
      __HAL_SD_CLEAR_FLAG(hsd, SDMMC_FLAG_DTIMEOUT);

      errorstate = 0;

      return errorstate;
    }
    else if (__HAL_SD_GET_FLAG(hsd, SDMMC_FLAG_DCRCFAIL))
    {
      __HAL_SD_CLEAR_FLAG(hsd, SDMMC_FLAG_DCRCFAIL);

      errorstate = SDMMC_ERROR_DATA_CRC_FAIL;

      return errorstate;
    }
    else if (__HAL_SD_GET_FLAG(hsd, SDMMC_FLAG_RXOVERR))
    {
      __HAL_SD_CLEAR_FLAG(hsd, SDMMC_FLAG_RXOVERR);

      errorstate = SDMMC_ERROR_RX_OVERRUN;

      return errorstate;
    }
    else
    {
      /* No error flag set */
    }

    /* Clear all the static flags */
    __HAL_SD_CLEAR_FLAG(hsd, SDMMC_STATIC_DATA_FLAGS);

    /* Test if the switch mode HS is ok */
    if ((((uint8_t*)SD_hs)[13] & 2U) != 2U)
    {
      errorstate = SDMMC_ERROR_UNSUPPORTED_FEATURE;
    }

  }

  return errorstate;
}