}
          else
          {
            restwords = ((TotalNumberOfBytes - bytestransferred) % 4 == 0) ? ((TotalNumberOfBytes - bytestransferred) / 4) :
                        ((TotalNumberOfBytes - bytestransferred) / 4 + 1);

            for (count = 0; count < restwords; count++, tempbuff++, bytestransferred += 4)
            {
              SDIO_WriteData(*tempbuff);
            }
          }
        }
      }

      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_TXUNDERR) != RESET)
      {
        SDIO_ClearFlag(SDIO_FLAG_TXUNDERR);
        errorstatus = SD_TX_UNDERRUN;
        return(errorstatus);
      }
      else if (SDIO_GetFlagStatus(SDIO_FLAG_STBITERR) != RESET)
      {
        SDIO_ClearFlag(SDIO_FLAG_STBITERR);
        errorstatus = SD_START_BIT_ERR;
        return(errorstatus);
      }

      if (SDIO_GetFlagStatus(SDIO_FLAG_DATAEND) != RESET)
      {
        if ((SDIO_SECURE_DIGITAL_CARD == CardType) || (SDIO_HIGH_CAPACITY_SD_CARD == CardType))
        {
          /* 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);

          if (errorstatus != SD_OK)
          {
            return(errorstatus);
          }
        }
      }
    }
    else if (DeviceMode == SD_INTERRUPT_MODE)
    {
      SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_TXFIFOHE | SDIO_IT_TXUNDERR | SDIO_IT_STBITERR, ENABLE);
      while ((TransferEnd == 0) && (TransferError == SD_OK))
      {}
      if (TransferError != SD_OK)
      {
        return(TransferError);
      }
    }
    else if (DeviceMode == SD_DMA_MODE)
    {
      SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_TXUNDERR | SDIO_IT_STBITERR, ENABLE);
      SDIO_DMACmd(ENABLE);
      DMA_TxConfiguration(writebuff, (NumberOfBlocks * BlockSize));
      while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
      {}
      while ((TransferEnd == 0) && (TransferError == SD_OK))
      {}
      if (TransferError != SD_OK)
      {
        return(TransferError);
      }
    }
  }
  /* Clear all the static flags */
  SDIO_ClearFlag(SDIO_STATIC_FLAGS);

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

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

  return(errorstatus);
}

/*******************************************************************************
* Function Name  : SD_GetTransferState
* Description    : Gets the cuurent data transfer state.
* Input          : None
* Output         : 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);
  }
}

/*******************************************************************************
* Function Name  : SD_StopTransfer
* Description    : Aborts an ongoing data transfer.
* Input          : None
* Output         : 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);
}

/*******************************************************************************
* Function Name  : SD_Erase
* Description    : Allows to erase memory area specified for the given card.
* Input          : - startaddr: the start address.
*                  - endaddr: the end address.
* Output         : 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);
}

/*******************************************************************************
* Function Name  : SD_SendStatus
* Description    : Returns the current card's status.
* Input          : pcardstatus: pointer to the buffer that will contain the SD 
*                  card status (Card Status register).
* Output         : 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);
}

/*******************************************************************************
* Function Name  : SD_SendSDStatus
* Description    : Returns the current SD card's status.
* Input          : psdstatus: pointer to the buffer that will contain the SD 
*                  card status (SD Status register).
* Output         : 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