errorstatus = IsCardProgramming(&cardstate);

  while ((errorstatus == SD_OK) && ((cardstate == SD_CARD_PROGRAMMING) || (cardstate == SD_CARD_RECEIVING)))
  {
    errorstatus = IsCardProgramming(&cardstate);
  }

  return(errorstatus);
}

/*******************************************************************************
* 函數名  : SD_GetTransferState
* 功能描述    : Gets the cuurent data transfer state.
* 輸入          : None
* 輸出         : None
* Return         : SDTransferState: Data Transfer state.
*                  This value can be: 
*                   - SD_NO_TRANSFER: No data transfer is acting
*                   - SD_TRANSFER_IN_PROGRESS: Data transfer is acting
*******************************************************************************/
SDTransferState SD_GetTransferState(void)
{
  if (SDIO->STA & (SDIO_FLAG_TXACT | SDIO_FLAG_RXACT))
  {
    return(SD_TRANSFER_IN_PROGRESS);
  }
  else
  {
    return(SD_NO_TRANSFER);
  }
}

/*******************************************************************************
* 函數名  : SD_StopTransfer
* 功能描述    : Aborts an ongoing data transfer.
* 輸入          : None
* 輸出         : None
* Return         : SD_Error: SD Card Error code.
*******************************************************************************/
SD_Error SD_StopTransfer(void)
{
  SD_Error errorstatus = SD_OK;

  /* Send CMD12 STOP_TRANSMISSION  */
  SDIO_CmdInitStructure.SDIO_Argument = 0x0;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_STOP_TRANSMISSION;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);

  errorstatus = CmdResp1Error(SDIO_STOP_TRANSMISSION);

  return(errorstatus);
}

/*******************************************************************************
* 函數名  : SD_Erase
* 功能描述    : Allows to erase memory area specified for the given card.
* 輸入          : - startaddr: the start address.
*                  - endaddr: the end address.
* 輸出         : None
* Return         : SD_Error: SD Card Error code.
*******************************************************************************/
SD_Error SD_Erase(u32 startaddr, u32 endaddr)
{
  SD_Error errorstatus = SD_OK;
  u32 delay = 0;
  vu32 maxdelay = 0;
  u8 cardstate = 0;

  /* Check if the card coomnd class supports erase command */
  if (((CSD_Tab[1] >> 20) & SD_CCCC_ERASE) == 0)
  {
    errorstatus = SD_REQUEST_NOT_APPLICABLE;
    return(errorstatus);
  }

  maxdelay = 72000 / ((SDIO->CLKCR & 0xFF) + 2);

  if (SDIO_GetResponse(SDIO_RESP1) & SD_CARD_LOCKED)
  {
    errorstatus = SD_LOCK_UNLOCK_FAILED;
    return(errorstatus);
  }

  /* According to sd-card spec 1.0 ERASE_GROUP_START (CMD32) and erase_group_end(CMD33) */
  if ((SDIO_SECURE_DIGITAL_CARD == CardType) ||  (SDIO_HIGH_CAPACITY_SD_CARD == CardType))
  {
    /* Send CMD32 SD_ERASE_GRP_START with argument as addr  */
    SDIO_CmdInitStructure.SDIO_Argument = startaddr;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SD_ERASE_GRP_START;
    SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
    SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
    SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
    SDIO_SendCommand(&SDIO_CmdInitStructure);

    errorstatus = CmdResp1Error(SDIO_SD_ERASE_GRP_START);
    if (errorstatus != SD_OK)
    {
      return(errorstatus);
    }

    /* Send CMD33 SD_ERASE_GRP_END with argument as addr  */
    SDIO_CmdInitStructure.SDIO_Argument = endaddr;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SD_ERASE_GRP_END;
    SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
    SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
    SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
    SDIO_SendCommand(&SDIO_CmdInitStructure);

    errorstatus = CmdResp1Error(SDIO_SD_ERASE_GRP_END);
    if (errorstatus != SD_OK)
    {
      return(errorstatus);
    }
  }

  /* Send CMD38 ERASE */
  SDIO_CmdInitStructure.SDIO_Argument = 0;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_ERASE;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);

  errorstatus = CmdResp1Error(SDIO_ERASE);

  if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }

  for (delay = 0; delay < maxdelay; delay++)
  {}

  /* Wait till the card is in programming state */
  errorstatus = IsCardProgramming(&cardstate);

  while ((errorstatus == SD_OK) && ((SD_CARD_PROGRAMMING == cardstate) || (SD_CARD_RECEIVING == cardstate)))
  {
    errorstatus = IsCardProgramming(&cardstate);
  }

  return(errorstatus);
}

/*******************************************************************************
* 函數名  : SD_SendStatus
* 功能描述    : Returns the current card's status.
* 輸入          : pcardstatus: pointer to the buffer that will contain the SD 
*                  card status (Card Status register).
* 輸出         : None
* Return         : SD_Error: SD Card Error code.
*******************************************************************************/
SD_Error SD_SendStatus(u32 *pcardstatus)
{
  SD_Error errorstatus = SD_OK;

  if (pcardstatus == NULL)
  {
    errorstatus = SD_INVALID_PARAMETER;
    return(errorstatus);
  }

  SDIO_CmdInitStructure.SDIO_Argument = (u32) RCA << 16;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_STATUS;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);


  errorstatus = CmdResp1Error(SDIO_SEND_STATUS);

  if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }

  *pcardstatus = SDIO_GetResponse(SDIO_RESP1);

  return(errorstatus);
}

/*******************************************************************************
* 函數名  : SD_SendSDStatus
* 功能描述    : Returns the current SD card's status.
* 輸入          : psdstatus: pointer to the buffer that will contain the SD 
*                  card status (SD Status register).
* 輸出         : None
* Return         : SD_Error: SD Card Error code.
*******************************************************************************/
SD_Error SD_SendSDStatus(u32 *psdstatus)
{
  SD_Error errorstatus = SD_OK;
  u32 count = 0;

  if (SDIO_GetResponse(SDIO_RESP1) & SD_CARD_LOCKED)
  {
    errorstatus = SD_LOCK_UNLOCK_FAILED;
    return(errorstatus);
  }

  /* Set block size for card if it is not equal to current block size for card. */
  SDIO_CmdInitStructure.SDIO_Argument = 64;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SET_BLOCKLEN;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);

  errorstatus = CmdResp1Error(SDIO_SET_BLOCKLEN);

  if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }

  /* CMD55 */
  SDIO_CmdInitStructure.SDIO_Argument = (u32) RCA << 16;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_APP_CMD;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);
  errorstatus = CmdResp1Error(SDIO_APP_CMD);

  if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }

  SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
  SDIO_DataInitStructure.SDIO_DataLength = 64;
  SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_64b;
  SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToSDIO;
  SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
  SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
  SDIO_DataConfig(&SDIO_DataInitStructure);


  /* Send ACMD13 SD_APP_STAUS  with argument as card's RCA.*/
  SDIO_CmdInitStructure.SDIO_Argument = 0;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SD_APP_STAUS;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Short;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  SDIO_SendCommand(&SDIO_CmdInitStructure);
  errorstatus = CmdResp1Error(SDIO_SD_APP_STAUS);

  if (errorstatus != SD_OK)
  {
    return(errorstatus);
  }

  while (!(SDIO->STA &(SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_DBCKEND | SDIO_FLAG_STBITERR)))
  {
    if (SDIO_GetFlagStatus(SDIO_FLAG_RXFIFOHF) != RESET)
    {
      for (count = 0; count < 8; count++)
      {
        *(psdstatus + count) = SDIO_ReadData();
      }
      psdstatus += 8;
    }
  }

  if (SDIO_GetFlagStatus(SDIO_FLAG_DTIMEOUT) != RESET)
  {
    SDIO_ClearFlag(SDIO_FLAG_DTIMEOUT);
    errorstatus = SD_DATA_TIMEOUT;
    return(errorstatus);
  }
  else if (SDIO_GetFlagStatus(SDIO_FLAG_DCRCFAIL) != RESET)
  {
    SDIO_ClearFlag(SDIO_FLAG_DCRCFAIL);
    errorstatus = SD_DATA_CRC_FAIL;
    return(errorstatus);
  }
  else if (SDIO_GetFlagStatus(SDIO_FLAG_RXOVERR) != RESET)
  {
    SDIO_ClearFlag(SDIO_FLAG_RXOVERR);
    errorstatus = SD_RX_OVERRUN;
    return(errorstatus);
  }
  else if (SDIO_GetFlagStatus(SDIO_FLAG_STBITERR) != RESET)
  {
    SDIO_ClearFlag(SDIO_FLAG_STBITERR);
    errorstatus = SD_START_BIT_ERR;
    return(errorstatus);
  }

  while (SDIO_GetFlagStatus(SDIO_FLAG_RXDAVL) != RESET)
  {
    *psdstatus = SDIO_ReadData();
    psdstatus++;
  }

  /* Clear all the static status flags*/
  SDIO_ClearFlag(SDIO_STATIC_FLAGS);
  psdstatus -= 16;
  for (count = 0; count < 16; count++)
  {
    psdstatus[count] = ((psdstatus[count] & SD_0TO7BITS) << 24) |((psdstatus[count] & SD_8TO15BITS) << 8) |
                       ((psdstatus[count] & SD_16TO23BITS) >> 8) |((psdstatus[count] & SD_24TO31BITS) >> 24);
  }
  return(errorstatus);
}

/*******************************************************************************
* 函數名  : SD_ProcessIRQSrc
* 功能描述    : Allows to process all the interrupts that are high.
* 輸入          : None
* 輸出         : None
* Return         : SD_Error: SD Card Error code.
*******************************************************************************/
SD_Error SD_ProcessIRQSrc(void)
{
  u32 count = 0, restwords = 0;

  if (DeviceMode == SD_INTERRUPT_MODE)
  {
    if (SDIO_GetITStatus(SDIO_IT_RXFIFOHF) != RESET)
    {
      for (count = 0; count < SD_HALFFIFO; count++)
      {
        *(DestBuffer + count) = SDIO_ReadData();
      }
      DestBuffer += SD_HALFFIFO;
      NumberOfBytes += SD_HALFFIFOBYTES;
    }
    else if (SDIO_GetITStatus(SDIO_IT_TXFIFOHE) != RESET)
    {
      if ((TotalNumberOfBytes - NumberOfBytes) < SD_HALFFIFOBYTES)
      {
        restwords = ((TotalNumberOfBytes - NumberOfBytes) %  4 == 0) ?
                    ((TotalNumberOfBytes - NumberOfBytes) / 4) :
                    ((TotalNumberOfBytes - NumberOfBytes) / 4 + 1);

        for (count = 0; count < restwords;  count++, SrcBuffer++, NumberOfBytes += 4)
        {
          SDIO_WriteData(*SrcBuffer);
        }
      }
      else
      {
        for (count = 0; count < SD_HALFFIFO; count++)
        {
          SDIO_WriteData(*(SrcBuffer + count));
        }

        SrcBuffer += SD_HALFFIFO;
        NumberOfBytes += SD_HALFFIFOBYTES;
      }
    }
  }

  if (SDIO_GetITStatus(SDIO_IT_DATAEND) != RESET)
  {
    if (DeviceMode != SD_DMA_MODE)
    {
      while ((SDIO_GetFlagStatus(SDIO_FLAG_RXDAVL) != RESET)  &&  (NumberOfBytes < TotalNumberOfBytes))
      {
        *DestBuffer = SDIO_ReadData();
        DestBuffer++;
        NumberOfBytes += 4;
      }
    }

    if (StopCondition == 1)
    {
      TransferError = SD_StopTransfer();
    }
    else
    {
      TransferError = SD_OK;
    }
    SDIO_ClearITPendingBit(SDIO_IT_DATAEND);
    SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND |
                  SDIO_IT_TXFIFOHE | SDIO_IT_RXFIFOHF | SDIO_IT_TXUNDERR |
                  SDIO_IT_RXOVERR | SDIO_IT_STBITERR, DISAB