sdcard.c

/**
  ******************************************************************************
  * @file    SDIO/sdcard.c
  * @author  MCD Application Team
  * @version V3.1.2
  * @date    09/28/2009
  * @brief   This file provides all the SD Card driver firmware functions.
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
  *
  * <h2><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h2>
  */

/* Includes ------------------------------------------------------------------*/
#include "sdcard.h"
#include "stm32f10x_dma.h"
#include "stm32f10x_sdio.h"
#include "stdbool.h"
#include <rtthread.h>

/** @addtogroup STM32F10x_StdPeriph_Examples
  * @{
  */

/** @addtogroup SDIO_Example
  * @{
  */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define NULL 0
#define SDIO_STATIC_FLAGS               ((uint32_t)0x000005FF)
#define SDIO_CMD0TIMEOUT                ((uint32_t)0x00002710)
#define SDIO_FIFO_Address               ((uint32_t)0x40018080)

/* Mask for errors Card Status R1 (OCR Register) */
#define SD_OCR_ADDR_OUT_OF_RANGE        ((uint32_t)0x80000000)
#define SD_OCR_ADDR_MISALIGNED          ((uint32_t)0x40000000)
#define SD_OCR_BLOCK_LEN_ERR            ((uint32_t)0x20000000)
#define SD_OCR_ERASE_SEQ_ERR            ((uint32_t)0x10000000)
#define SD_OCR_BAD_ERASE_PARAM          ((uint32_t)0x08000000)
#define SD_OCR_WRITE_PROT_VIOLATION     ((uint32_t)0x04000000)
#define SD_OCR_LOCK_UNLOCK_FAILED       ((uint32_t)0x01000000)
#define SD_OCR_COM_CRC_FAILED           ((uint32_t)0x00800000)
#define SD_OCR_ILLEGAL_CMD              ((uint32_t)0x00400000)
#define SD_OCR_CARD_ECC_FAILED          ((uint32_t)0x00200000)
#define SD_OCR_CC_ERROR                 ((uint32_t)0x00100000)
#define SD_OCR_GENERAL_UNKNOWN_ERROR    ((uint32_t)0x00080000)
#define SD_OCR_STREAM_READ_UNDERRUN     ((uint32_t)0x00040000)
#define SD_OCR_STREAM_WRITE_OVERRUN     ((uint32_t)0x00020000)
#define SD_OCR_CID_CSD_OVERWRIETE       ((uint32_t)0x00010000)
#define SD_OCR_WP_ERASE_SKIP            ((uint32_t)0x00008000)
#define SD_OCR_CARD_ECC_DISABLED        ((uint32_t)0x00004000)
#define SD_OCR_ERASE_RESET              ((uint32_t)0x00002000)
#define SD_OCR_AKE_SEQ_ERROR            ((uint32_t)0x00000008)
#define SD_OCR_ERRORBITS                ((uint32_t)0xFDFFE008)

/* Masks for R6 Response */
#define SD_R6_GENERAL_UNKNOWN_ERROR     ((uint32_t)0x00002000)
#define SD_R6_ILLEGAL_CMD               ((uint32_t)0x00004000)
#define SD_R6_COM_CRC_FAILED            ((uint32_t)0x00008000)

#define SD_VOLTAGE_WINDOW_SD            ((uint32_t)0x80100000)
#define SD_HIGH_CAPACITY                ((uint32_t)0x40000000)
#define SD_STD_CAPACITY                 ((uint32_t)0x00000000)
#define SD_CHECK_PATTERN                ((uint32_t)0x000001AA)
#define SD_VOLTAGE_WINDOW_MMC           ((uint32_t)0x80FF8000)

#define SD_MAX_VOLT_TRIAL               ((uint32_t)0x0000FFFF)
#define SD_ALLZERO                      ((uint32_t)0x00000000)

#define SD_WIDE_BUS_SUPPORT             ((uint32_t)0x00040000)
#define SD_SINGLE_BUS_SUPPORT           ((uint32_t)0x00010000)
#define SD_CARD_LOCKED                  ((uint32_t)0x02000000)
#define SD_CARD_PROGRAMMING             ((uint32_t)0x00000007)
#define SD_CARD_RECEIVING               ((uint32_t)0x00000006)
#define SD_DATATIMEOUT                  ((uint32_t)0xFFFFFFFF)
#define SD_0TO7BITS                     ((uint32_t)0x000000FF)
#define SD_8TO15BITS                    ((uint32_t)0x0000FF00)
#define SD_16TO23BITS                   ((uint32_t)0x00FF0000)
#define SD_24TO31BITS                   ((uint32_t)0xFF000000)
#define SD_MAX_DATA_LENGTH              ((uint32_t)0x01FFFFFF)

#define SD_HALFFIFO                     ((uint32_t)0x00000008)
#define SD_HALFFIFOBYTES                ((uint32_t)0x00000020)

/* Command Class Supported */
#define SD_CCCC_LOCK_UNLOCK             ((uint32_t)0x00000080)
#define SD_CCCC_WRITE_PROT              ((uint32_t)0x00000040)
#define SD_CCCC_ERASE                   ((uint32_t)0x00000020)

/* Following commands are SD Card Specific commands.
   SDIO_APP_CMD should be sent before sending these commands. */
#define SDIO_SEND_IF_COND               ((uint32_t)0x00000008)

#define SDIO_INIT_CLK_DIV                  ((uint8_t)0xB2)
#define SDIO_TRANSFER_CLK_DIV              ((uint8_t)0x1)

/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
static uint32_t CardType =  SDIO_STD_CAPACITY_SD_CARD_V1_1;
static uint32_t CSD_Tab[4], CID_Tab[4], RCA = 0;
static uint32_t DeviceMode = SD_POLLING_MODE;
static uint32_t TotalNumberOfBytes = 0, StopCondition = 0;
uint32_t *SrcBuffer, *DestBuffer;
volatile SD_Error TransferError = SD_OK;
__IO uint32_t TransferEnd = 0;
__IO uint32_t NumberOfBytes = 0;
SDIO_InitTypeDef SDIO_InitStructure;
SDIO_CmdInitTypeDef SDIO_CmdInitStructure;
SDIO_DataInitTypeDef SDIO_DataInitStructure;

/* Private function prototypes -----------------------------------------------*/
static SD_Error CmdError(void);
static SD_Error CmdResp1Error(uint8_t cmd);
static SD_Error CmdResp7Error(void);
static SD_Error CmdResp3Error(void);
static SD_Error CmdResp2Error(void);
static SD_Error CmdResp6Error(uint8_t cmd, uint16_t *prca);
static SD_Error SDEnWideBus(FunctionalState NewState);
static SD_Error IsCardProgramming(uint8_t *pstatus);
static SD_Error FindSCR(uint16_t rca, uint32_t *pscr);
static uint8_t convert_from_bytes_to_power_of_two(uint16_t NumberOfBytes);
static void GPIO_Configuration(void);
static void DMA_TxConfiguration(uint32_t *BufferSRC, uint32_t BufferSize);
static void DMA_RxConfiguration(uint32_t *BufferDST, uint32_t BufferSize);

/* Private functions ---------------------------------------------------------*/

/**
  * @brief  Initializes the SD Card and put it into StandBy State (Ready
  *   for data transfer).
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_Init(void)
{
    SD_Error errorstatus = SD_OK;

    /* Configure SDIO interface GPIO */
    GPIO_Configuration();

    /* Enable the SDIO AHB Clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_SDIO, ENABLE);

    /* Enable the DMA2 Clock */
    RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);

    SDIO_DeInit();

    errorstatus = SD_PowerON();

    if (errorstatus != SD_OK)
    {
        /* CMD Response TimeOut (wait for CMDSENT flag) */
        return(errorstatus);
    }

    errorstatus = SD_InitializeCards();

    if (errorstatus != SD_OK)
    {
        /* CMD Response TimeOut (wait for CMDSENT flag) */
        return(errorstatus);
    }

    /* Configure the SDIO peripheral */
    /* HCLK = 72 MHz, SDIOCLK = 72 MHz, SDIO_CK = HCLK/(2 + 1) = 24 MHz */
    SDIO_InitStructure.SDIO_ClockDiv = SDIO_TRANSFER_CLK_DIV;
    SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
    SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Disable;
    SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;
    SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_1b;
    SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Enable;
    SDIO_Init(&SDIO_InitStructure);

    return(errorstatus);
}

/**
  * @brief  Enquires cards about their operating voltage and configures
  *   clock controls.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_PowerON(void)
{
    SD_Error errorstatus = SD_OK;
    uint32_t response = 0, count = 0, i = 0;
    bool validvoltage = false;
    uint32_t SDType = SD_STD_CAPACITY;

    /* Power ON Sequence -------------------------------------------------------*/
    /* Configure the SDIO peripheral */
    SDIO_InitStructure.SDIO_ClockDiv = SDIO_INIT_CLK_DIV; /* HCLK = 72MHz, SDIOCLK = 72MHz, SDIO_CK = HCLK/(178 + 2) = 400 KHz */
    SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
    SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Disable;
    SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;
    SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_1b;
    SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;
    SDIO_Init(&SDIO_InitStructure);

    /* Set Power State to ON */
    SDIO_SetPowerState(SDIO_PowerState_ON);

    /* Enable SDIO Clock */
    SDIO_ClockCmd(ENABLE);

    /* CMD0: GO_IDLE_STATE -------------------------------------------------------*/
    /* No CMD response required */
    SDIO_CmdInitStructure.SDIO_Argument = 0x0;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_GO_IDLE_STATE;
    SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_No;
    SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
    SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;

    for(i = 0; i < 74; i++)
    {
        SDIO_SendCommand(&SDIO_CmdInitStructure);
        errorstatus = CmdError();
    }

    if (errorstatus != SD_OK)
    {
        /* CMD Response TimeOut (wait for CMDSENT flag) */
        return(errorstatus);
    }

    /* CMD8: SEND_IF_COND --------------------------------------------------------*/
    /* Send CMD8 to verify SD card interface operating condition */
    /* Argument: - [31:12]: Reserved (shall be set to '0')
                 - [11:8]: Supply Voltage (VHS) 0x1 (Range: 2.7-3.6 V)
                 - [7:0]: Check Pattern (recommended 0xAA) */
    /* CMD Response: R7 */
    SDIO_CmdInitStructure.SDIO_Argument = SD_CHECK_PATTERN;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_IF_COND;
    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 = CmdResp7Error();

    if (errorstatus == SD_OK)
    {
        CardType = SDIO_STD_CAPACITY_SD_CARD_V2_0; /* SD Card 2.0 */
        SDType = SD_HIGH_CAPACITY;
    }
    else
    {
        /* CMD55 */
        SDIO_CmdInitStructure.SDIO_Argument = 0x00;
        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);
    }
    /* CMD55 */
    SDIO_CmdInitStructure.SDIO_Argument = 0x00;
    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 is Command TimeOut, it is a MMC card */
    /* If errorstatus is SD_OK it is a SD card: SD card 2.0 (voltage range mismatch)
       or SD card 1.x */
    if (errorstatus == SD_OK)
    {
        /* SD CARD */
        /* Send ACMD41 SD_APP_OP_COND with Argument 0x80100000 */
        while ((!validvoltage) && (count < SD_MAX_VOLT_TRIAL))
        {

            /* SEND CMD55 APP_CMD with RCA as 0 */
            SDIO_CmdInitStructure.SDIO_Argument = 0x00;
            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_CmdInitStructure.SDIO_Argument = SD_VOLTAGE_WINDOW_SD | SDType;
            SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SD_APP_OP_COND;
            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 = CmdResp3Error();
            if (errorstatus != SD_OK)
            {
                return(errorstatus);
            }

            response = SDIO_GetResponse(SDIO_RESP1);
            validvoltage = (bool) (((response >> 31) == 1) ? 1 : 0);
            count++;
        }
        if (count >= SD_MAX_VOLT_TRIAL)
        {
            errorstatus = SD_INVALID_VOLTRANGE;
            return(errorstatus);
        }

        if (response &= SD_HIGH_CAPACITY)
        {
            CardType = SDIO_HIGH_CAPACITY_SD_CARD;
        }
    }/* else MMC Card */
    else
    {
        CardType = SDIO_MULTIMEDIA_CARD;

        /* Send CMD1 SEND_OP_COND with Argument 0x80FF8000 */
        while ((!validvoltage) && (count < SD_MAX_VOLT_TRIAL))
        {
            /* SEND CMD55 APP_CMD with RCA as 0 */
            SDIO_CmdInitStructure.SDIO_Argument = SD_VOLTAGE_WINDOW_MMC;
            SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_OP_COND;
            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 = CmdResp3Error();
            if (errorstatus != SD_OK)
            {
                return(errorstatus);
            }

            response = SDIO_GetResponse(SDIO_RESP1);
            validvoltage = (bool) (((response >> 31) == 1) ? 1 : 0);
            count++;
        }
        if (count >= SD_MAX_VOLT_TRIAL)
        {
            errorstatus = SD_INVALID_VOLTRANGE;
            return(errorstatus);
        }
    }

    return(SD_OK);
}

/**
  * @brief  Turns the SDIO output signals off.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_PowerOFF(void)
{
    SD_Error errorstatus = SD_OK;

    /* Set Power State to OFF */
    SDIO_SetPowerState(SDIO_PowerState_OFF);

    return(errorstatus);
}

/**
  * @brief  Intialises all cards or single card as the case may be.
  *   Card(s) come into standby state.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_InitializeCards(void)
{
    SD_Error errorstatus = SD_OK;
    uint16_t rca = 0x01;

    if (SDIO_GetPowerState() == SDIO_PowerState_OFF)
    {
        errorstatus = SD_REQUEST_NOT_APPLICABLE;
        return(errorstatus);
    }

    if (SDIO_SECURE_DIGITAL_IO_CARD != CardType)
    {
        /* Send CMD2 ALL_SEND_CID */
        SDIO_CmdInitStructure.SDIO_Argument = 0x0;
        SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_ALL_SEND_CID;
        SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Long;
        SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
        SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
        SDIO_SendCommand(&SDIO_CmdInitStructure);

        errorstatus = CmdResp2Error();

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

        CID_Tab[0] = SDIO_GetResponse(SDIO_RESP1);
        CID_Tab[1] = SDIO_GetResponse(SDIO_RESP2);
        CID_Tab[2] = SDIO_GetResponse(SDIO_RESP3);
        CID_Tab[3] = SDIO_GetResponse(SDIO_RESP4);
    }
    if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == CardType) ||  (SDIO_STD_CAPACITY_SD_CARD_V2_0 == CardType) ||  (SDIO_SECURE_DIGITAL_IO_COMBO_CARD == CardType)
            ||  (SDIO_HIGH_CAPACITY_SD_CARD == CardType))
    {
        /* Send CMD3 SET_REL_ADDR with argument 0 */
        /* SD Card publishes its RCA. */
        SDIO_CmdInitStructure.SDIO_Argument = 0x00;
        SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SET_REL_ADDR;
        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 = CmdResp6Error(SDIO_SET_REL_ADDR, &rca);

        if (SD_OK != errorstatus)
        {
            return(errorstatus);
        }
    }
    if (SDIO_MULTIMEDIA_CARD == CardType)
    {
        /* Send CMD3 SET_REL_ADDR with argument 0 */
        /* SD Card publishes its RCA. */
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)(rca << 16);
        SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SET_REL_ADDR;
        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 = CmdResp2Error();

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

    if (SDIO_SECURE_DIGITAL_IO_CARD != CardType)
    {
        RCA = rca;

        /* Send CMD9 SEND_CSD with argument as card's RCA */
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)(rca << 16);
        SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEND_CSD;
        SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_Long;
        SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
        SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
        SDIO_SendCommand(&SDIO_CmdInitStructure);

        errorstatus = CmdResp2Error();

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

        CSD_Tab[0] = SDIO_GetResponse(SDIO_RESP1);
        CSD_Tab[1] = SDIO_GetResponse(SDIO_RESP2);
        CSD_Tab[2] = SDIO_GetResponse(SDIO_RESP3);
        CSD_Tab[3] = SDIO_GetResponse(SDIO_RESP4);
    }

    errorstatus = SD_OK; /* All cards get intialized */

    return(errorstatus);
}

/**
  * @brief  Returns information about specific card.
  * @param  cardinfo : pointer to a SD_CardInfo structure
  *   that contains all SD card information.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_GetCardInfo(SD_CardInfo *cardinfo)
{
    SD_Error errorstatus = SD_OK;
    uint8_t tmp = 0;

    cardinfo->CardType = (uint8_t)CardType;
    cardinfo->RCA = (uint16_t)RCA;

    /* Byte 0 */
    tmp = (uint8_t)((CSD_Tab[0] & 0xFF000000) >> 24);
    cardinfo->SD_csd.CSDStruct = (tmp & 0xC0) >> 6;
    cardinfo->SD_csd.SysSpecVersion = (tmp & 0x3C) >> 2;
    cardinfo->SD_csd.Reserved1 = tmp & 0x03;

    /* Byte 1 */
    tmp = (uint8_t)((CSD_Tab[0] & 0x00FF0000) >> 16);
    cardinfo->SD_csd.TAAC = tmp;

    /* Byte 2 */
    tmp = (uint8_t)((CSD_Tab[0] & 0x0000FF00) >> 8);
    cardinfo->SD_csd.NSAC = tmp;

    /* Byte 3 */
    tmp = (uint8_t)(CSD_Tab[0] & 0x000000FF);
    cardinfo->SD_csd.MaxBusClkFrec = tmp;

    /* Byte 4 */
    tmp = (uint8_t)((CSD_Tab[1] & 0xFF000000) >> 24);
    cardinfo->SD_csd.CardComdClasses = tmp << 4;

    /* Byte 5 */
    tmp = (uint8_t)((CSD_Tab[1] & 0x00FF0000) >> 16);
    cardinfo->SD_csd.CardComdClasses |= (tmp & 0xF0) >> 4;
    cardinfo->SD_csd.RdBlockLen = tmp & 0x0F;

    /* Byte 6 */
    tmp = (uint8_t)((CSD_Tab[1] & 0x0000FF00) >> 8);
    cardinfo->SD_csd.PartBlockRead = (tmp & 0x80) >> 7;
    cardinfo->SD_csd.WrBlockMisalign = (tmp & 0x40) >> 6;
    cardinfo->SD_csd.RdBlockMisalign = (tmp & 0x20) >> 5;
    cardinfo->SD_csd.DSRImpl = (tmp & 0x10) >> 4;
    cardinfo->SD_csd.Reserved2 = 0; /* Reserved */

    if ((CardType == SDIO_STD_CAPACITY_SD_CARD_V1_1) || (CardType == SDIO_STD_CAPACITY_SD_CARD_V2_0))
    {
        cardinfo->SD_csd.DeviceSize = (tmp & 0x03) << 10;

        /* Byte 7 */
        tmp = (uint8_t)(CSD_Tab[1] & 0x000000FF);
        cardinfo->SD_csd.DeviceSize |= (tmp) << 2;

        /* Byte 8 */
        tmp = (uint8_t)((CSD_Tab[2] & 0xFF000000) >> 24);
        cardinfo->SD_csd.DeviceSize |= (tmp & 0xC0) >> 6;

        cardinfo->SD_csd.MaxRdCurrentVDDMin = (tmp & 0x38) >> 3;
        cardinfo->SD_csd.MaxRdCurrentVDDMax = (tmp & 0x07);

        /* Byte 9 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x00FF0000) >> 16);
        cardinfo->SD_csd.MaxWrCurrentVDDMin = (tmp & 0xE0) >> 5;
        cardinfo->SD_csd.MaxWrCurrentVDDMax = (tmp & 0x1C) >> 2;
        cardinfo->SD_csd.DeviceSizeMul = (tmp & 0x03) << 1;
        /* Byte 10 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x0000FF00) >> 8);
        cardinfo->SD_csd.DeviceSizeMul |= (tmp & 0x80) >> 7;

        cardinfo->CardCapacity = (cardinfo->SD_csd.DeviceSize + 1) ;
        cardinfo->CardCapacity *= (1 << (cardinfo->SD_csd.DeviceSizeMul + 2));
        cardinfo->CardBlockSize = 1 << (cardinfo->SD_csd.RdBlockLen);
        cardinfo->CardCapacity *= cardinfo->CardBlockSize;
    }
    else if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        /* Byte 7 */
        tmp = (uint8_t)(CSD_Tab[1] & 0x000000FF);
        cardinfo->SD_csd.DeviceSize = (tmp & 0x3F) << 16;

        /* Byte 8 */
        tmp = (uint8_t)((CSD_Tab[2] & 0xFF000000) >> 24);

        cardinfo->SD_csd.DeviceSize |= (tmp << 8);

        /* Byte 9 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x00FF0000) >> 16);

        cardinfo->SD_csd.DeviceSize |= (tmp);

        /* Byte 10 */
        tmp = (uint8_t)((CSD_Tab[2] & 0x0000FF00) >> 8);

        cardinfo->CardCapacity = (cardinfo->SD_csd.DeviceSize + 1) * 512 * 1024;
        cardinfo->CardBlockSize = 512;
    }


    cardinfo->SD_csd.EraseGrSize = (tmp & 0x40) >> 6;
    cardinfo->SD_csd.EraseGrMul = (tmp & 0x3F) << 1;

    /* Byte 11 */
    tmp = (uint8_t)(CSD_Tab[2] & 0x000000FF);
    cardinfo->SD_csd.EraseGrMul |= (tmp & 0x80) >> 7;
    cardinfo->SD_csd.WrProtectGrSize = (tmp & 0x7F);

    /* Byte 12 */
    tmp = (uint8_t)((CSD_Tab[3] & 0xFF000000) >> 24);
    cardinfo->SD_csd.WrProtectGrEnable = (tmp & 0x80) >> 7;
    cardinfo->SD_csd.ManDeflECC = (tmp & 0x60) >> 5;
    cardinfo->SD_csd.WrSpeedFact = (tmp & 0x1C) >> 2;
    cardinfo->SD_csd.MaxWrBlockLen = (tmp & 0x03) << 2;

    /* Byte 13 */
    tmp = (uint8_t)((CSD_Tab[3] & 0x00FF0000) >> 16);
    cardinfo->SD_csd.MaxWrBlockLen |= (tmp & 0xC0) >> 6;
    cardinfo->SD_csd.WriteBlockPaPartial = (tmp & 0x20) >> 5;
    cardinfo->SD_csd.Reserved3 = 0;
    cardinfo->SD_csd.ContentProtectAppli = (tmp & 0x01);

    /* Byte 14 */
    tmp = (uint8_t)((CSD_Tab[3] & 0x0000FF00) >> 8);
    cardinfo->SD_csd.FileFormatGrouop = (tmp & 0x80) >> 7;
    cardinfo->SD_csd.CopyFlag = (tmp & 0x40) >> 6;
    cardinfo->SD_csd.PermWrProtect = (tmp & 0x20) >> 5;
    cardinfo->SD_csd.TempWrProtect = (tmp & 0x10) >> 4;
    cardinfo->SD_csd.FileFormat = (tmp & 0x0C) >> 2;
    cardinfo->SD_csd.ECC = (tmp & 0x03);

    /* Byte 15 */
    tmp = (uint8_t)(CSD_Tab[3] & 0x000000FF);
    cardinfo->SD_csd.CSD_CRC = (tmp & 0xFE) >> 1;
    cardinfo->SD_csd.Reserved4 = 1;


    /* Byte 0 */
    tmp = (uint8_t)((CID_Tab[0] & 0xFF000000) >> 24);
    cardinfo->SD_cid.ManufacturerID = tmp;

    /* Byte 1 */
    tmp = (uint8_t)((CID_Tab[0] & 0x00FF0000) >> 16);
    cardinfo->SD_cid.OEM_AppliID = tmp << 8;

    /* Byte 2 */
    tmp = (uint8_t)((CID_Tab[0] & 0x000000FF00) >> 8);
    cardinfo->SD_cid.OEM_AppliID |= tmp;

    /* Byte 3 */
    tmp = (uint8_t)(CID_Tab[0] & 0x000000FF);
    cardinfo->SD_cid.ProdName1 = tmp << 24;

    /* Byte 4 */
    tmp = (uint8_t)((CID_Tab[1] & 0xFF000000) >> 24);
    cardinfo->SD_cid.ProdName1 |= tmp << 16;

    /* Byte 5 */
    tmp = (uint8_t)((CID_Tab[1] & 0x00FF0000) >> 16);
    cardinfo->SD_cid.ProdName1 |= tmp << 8;

    /* Byte 6 */
    tmp = (uint8_t)((CID_Tab[1] & 0x0000FF00) >> 8);
    cardinfo->SD_cid.ProdName1 |= tmp;

    /* Byte 7 */
    tmp = (uint8_t)(CID_Tab[1] & 0x000000FF);
    cardinfo->SD_cid.ProdName2 = tmp;

    /* Byte 8 */
    tmp = (uint8_t)((CID_Tab[2] & 0xFF000000) >> 24);
    cardinfo->SD_cid.ProdRev = tmp;

    /* Byte 9 */
    tmp = (uint8_t)((CID_Tab[2] & 0x00FF0000) >> 16);
    cardinfo->SD_cid.ProdSN = tmp << 24;

    /* Byte 10 */
    tmp = (uint8_t)((CID_Tab[2] & 0x0000FF00) >> 8);
    cardinfo->SD_cid.ProdSN |= tmp << 16;

    /* Byte 11 */
    tmp = (uint8_t)(CID_Tab[2] & 0x000000FF);
    cardinfo->SD_cid.ProdSN |= tmp << 8;

    /* Byte 12 */
    tmp = (uint8_t)((CID_Tab[3] & 0xFF000000) >> 24);
    cardinfo->SD_cid.ProdSN |= tmp;

    /* Byte 13 */
    tmp = (uint8_t)((CID_Tab[3] & 0x00FF0000) >> 16);
    cardinfo->SD_cid.Reserved1 |= (tmp & 0xF0) >> 4;
    cardinfo->SD_cid.ManufactDate = (tmp & 0x0F) << 8;

    /* Byte 14 */
    tmp = (uint8_t)((CID_Tab[3] & 0x0000FF00) >> 8);
    cardinfo->SD_cid.ManufactDate |= tmp;

    /* Byte 15 */
    tmp = (uint8_t)(CID_Tab[3] & 0x000000FF);
    cardinfo->SD_cid.CID_CRC = (tmp & 0xFE) >> 1;
    cardinfo->SD_cid.Reserved2 = 1;

    return(errorstatus);
}

/**
  * @brief  Enables wide bus opeartion for the requeseted card if
  *   supported by card.
  * @param  WideMode: Specifies the SD card wide bus mode.
  *   This parameter can be one of the following values:
  *     @arg SDIO_BusWide_8b: 8-bit data transfer (Only for MMC)
  *     @arg SDIO_BusWide_4b: 4-bit data transfer
  *     @arg SDIO_BusWide_1b: 1-bit data transfer
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_EnableWideBusOperation(uint32_t WideMode)
{
    SD_Error errorstatus = SD_OK;

    /* MMC Card doesn't support this feature */
    if (SDIO_MULTIMEDIA_CARD == CardType)
    {
        errorstatus = SD_UNSUPPORTED_FEATURE;
        return(errorstatus);
    }
    else if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == CardType) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == CardType) || (SDIO_HIGH_CAPACITY_SD_CARD == CardType))
    {
        if (SDIO_BusWide_8b == WideMode)
        {
            errorstatus = SD_UNSUPPORTED_FEATURE;
            return(errorstatus);
        }
        else if (SDIO_BusWide_4b == WideMode)
        {
            errorstatus = SDEnWideBus(ENABLE);

            if (SD_OK == errorstatus)
            {
                /* Configure the SDIO peripheral */
                SDIO_InitStructure.SDIO_ClockDiv = SDIO_TRANSFER_CLK_DIV;
                SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
                SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Disable;
                SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;
                SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_4b;
                SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;
                SDIO_Init(&SDIO_InitStructure);
            }
        }
        else
        {
            errorstatus = SDEnWideBus(DISABLE);

            if (SD_OK == errorstatus)
            {
                /* Configure the SDIO peripheral */
                SDIO_InitStructure.SDIO_ClockDiv = SDIO_TRANSFER_CLK_DIV;
                SDIO_InitStructure.SDIO_ClockEdge = SDIO_ClockEdge_Rising;
                SDIO_InitStructure.SDIO_ClockBypass = SDIO_ClockBypass_Disable;
                SDIO_InitStructure.SDIO_ClockPowerSave = SDIO_ClockPowerSave_Disable;
                SDIO_InitStructure.SDIO_BusWide = SDIO_BusWide_1b;
                SDIO_InitStructure.SDIO_HardwareFlowControl = SDIO_HardwareFlowControl_Disable;
                SDIO_Init(&SDIO_InitStructure);
            }
        }
    }

    return(errorstatus);
}

/**
  * @brief  Sets device mode whether to operate in Polling, Interrupt or
  *   DMA mode.
  * @param  Mode: Specifies the Data Transfer mode.
  *   This parameter can be one of the following values:
  *     @arg SD_DMA_MODE: Data transfer using DMA.
  *     @arg SD_INTERRUPT_MODE: Data transfer using interrupts.
  *     @arg SD_POLLING_MODE: Data transfer using flags.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_SetDeviceMode(uint32_t Mode)
{
    SD_Error errorstatus = SD_OK;

    if ((Mode == SD_DMA_MODE) || (Mode == SD_INTERRUPT_MODE) || (Mode == SD_POLLING_MODE))
    {
        DeviceMode = Mode;
    }
    else
    {
        errorstatus = SD_INVALID_PARAMETER;
    }
    return(errorstatus);

}

/**
  * @brief  Selects od Deselects the corresponding card.
  * @param  addr: Address of the Card to be selected.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_SelectDeselect(uint32_t addr)
{
    SD_Error errorstatus = SD_OK;

    /* Send CMD7 SDIO_SEL_DESEL_CARD */
    SDIO_CmdInitStructure.SDIO_Argument =  addr;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SEL_DESEL_CARD;
    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_SEL_DESEL_CARD);

    return(errorstatus);
}

/**
  * @brief  Allows to read one block from a specified address in a card.
  * @param  addr: Address from where data are to be read.
  * @param  readbuff: pointer to the buffer that will contain the
  *   received data
  * @param  BlockSize: the SD card Data block size.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_ReadBlock(uint32_t addr, uint32_t *readbuff, uint16_t BlockSize)
{
    SD_Error errorstatus = SD_OK;
    uint32_t count = 0, *tempbuff = readbuff;
    uint8_t power = 0;

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

    TransferError = SD_OK;
    TransferEnd = 0;
    TotalNumberOfBytes = 0;

    /* Clear all DPSM configuration */
    SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
    SDIO_DataInitStructure.SDIO_DataLength = 0;
    SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_1b;
    SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
    SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
    SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Disable;
    SDIO_DataConfig(&SDIO_DataInitStructure);
    SDIO_DMACmd(DISABLE);

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

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        BlockSize = 512;
        // addr /= 512;
    }
    if ((BlockSize > 0) && (BlockSize <= 2048) && ((BlockSize & (BlockSize - 1)) == 0))
    {
        power = convert_from_bytes_to_power_of_two(BlockSize);

        /* Set Block Size for Card */
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) BlockSize;
        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 (SD_OK != errorstatus)
        {
            return(errorstatus);
        }
    }
    else
    {
        errorstatus = SD_INVALID_PARAMETER;
        return(errorstatus);
    }

    SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
    SDIO_DataInitStructure.SDIO_DataLength = BlockSize;
    SDIO_DataInitStructure.SDIO_DataBlockSize = (uint32_t) power << 4;
    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);

    TotalNumberOfBytes = BlockSize;
    StopCondition = 0;
    DestBuffer = readbuff;

    /* Send CMD17 READ_SINGLE_BLOCK */
    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)addr;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_READ_SINGLE_BLOCK;
    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_READ_SINGLE_BLOCK);

    if (errorstatus != SD_OK)
    {
        return(errorstatus);
    }
    /* In case of single block transfer, no need of stop transfer at all.*/
    if (DeviceMode == SD_POLLING_MODE)
    {
        /* Polling mode */
        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++)
                {
                    *(tempbuff + count) = SDIO_ReadData();
                }
                tempbuff += 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)
        {
            *tempbuff = SDIO_ReadData();
            tempbuff++;
        }

        /* Clear all the static flags */
        SDIO_ClearFlag(SDIO_STATIC_FLAGS);
    }
    else if (DeviceMode == SD_INTERRUPT_MODE)
    {
        SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_RXFIFOHF | SDIO_IT_STBITERR, ENABLE);
        while ((TransferEnd == 0) && (TransferError == SD_OK))
        {}
        if (TransferError != SD_OK)
        {
            return(TransferError);
        }
    }
    else if (DeviceMode == SD_DMA_MODE)
    {
        rt_tick_t tick;

        SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_STBITERR, ENABLE);
        SDIO_DMACmd(ENABLE);
        tick = rt_tick_get();
        DMA_RxConfiguration(readbuff, BlockSize);
        while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
        {
            if ((TransferError != SD_OK) || (rt_tick_get() - tick > 10))
            {
                errorstatus = SD_ERROR;
                // rt_kprintf("sd error\n");
                break;
            }
        }
    }
    return(errorstatus);
}

/**
  * @brief  Allows to read blocks from a specified address  in a card.
  * @param  addr: Address from where data are to be read.
  * @param  readbuff: pointer to the buffer that will contain the
  *   received data.
  * @param  BlockSize: the SD card Data block size.
  * @param  NumberOfBlocks: number of blocks to be read.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_ReadMultiBlocks(uint32_t addr, uint32_t *readbuff, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
    SD_Error errorstatus = SD_OK;
    uint32_t count = 0, *tempbuff = readbuff;
    uint8_t power = 0;

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

    TransferError = SD_OK;
    TransferEnd = 0;
    TotalNumberOfBytes = 0;

    /* Clear all DPSM configuration */
    SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
    SDIO_DataInitStructure.SDIO_DataLength = 0;
    SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_1b;
    SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
    SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
    SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Disable;
    SDIO_DataConfig(&SDIO_DataInitStructure);
    SDIO_DMACmd(DISABLE);

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

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        BlockSize = 512;
        // addr /= 512;
    }

    if ((BlockSize > 0) && (BlockSize <= 2048) && (0 == (BlockSize & (BlockSize - 1))))
    {
        power = convert_from_bytes_to_power_of_two(BlockSize);

        /* Set Block Size for Card */
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) BlockSize;
        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 (SD_OK != errorstatus)
        {
            return(errorstatus);
        }
    }
    else
    {
        errorstatus = SD_INVALID_PARAMETER;
        return(errorstatus);
    }

    if (NumberOfBlocks > 1)
    {
        /* Common to all modes */
        if (NumberOfBlocks * BlockSize > SD_MAX_DATA_LENGTH)
        {
            errorstatus = SD_INVALID_PARAMETER;
            return(errorstatus);
        }

        TotalNumberOfBytes = NumberOfBlocks * BlockSize;
        StopCondition = 1;
        DestBuffer = readbuff;

        SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
        SDIO_DataInitStructure.SDIO_DataLength = NumberOfBlocks * BlockSize;
        SDIO_DataInitStructure.SDIO_DataBlockSize = (uint32_t) power << 4;
        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 CMD18 READ_MULT_BLOCK with argument data address */
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)addr;
        SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_READ_MULT_BLOCK;
        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_READ_MULT_BLOCK);

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

        if (DeviceMode == SD_POLLING_MODE)
        {
            /* Polling mode */
            while (!(SDIO->STA &(SDIO_FLAG_RXOVERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DATAEND | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_STBITERR)))
            {
                if (SDIO_GetFlagStatus(SDIO_FLAG_RXFIFOHF) != RESET)
                {
                    for (count = 0; count < SD_HALFFIFO; count++)
                    {
                        *(tempbuff + count) = SDIO_ReadData();
                    }
                    tempbuff += SD_HALFFIFO;
                }
            }

            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)
            {
                *tempbuff = SDIO_ReadData();
                tempbuff++;
            }

            if (SDIO_GetFlagStatus(SDIO_FLAG_DATAEND) != RESET)
            {
                /* In Case Of SD-CARD Send Command STOP_TRANSMISSION */
                if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == CardType) || (SDIO_HIGH_CAPACITY_SD_CARD == CardType) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == 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);
                    }
                }
            }
            /* Clear all the static flags */
            SDIO_ClearFlag(SDIO_STATIC_FLAGS);
        }
        else if (DeviceMode == SD_INTERRUPT_MODE)
        {
            SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_RXFIFOHF | SDIO_IT_STBITERR, ENABLE);
            while ((TransferEnd == 0) && (TransferError == SD_OK))
            {}
            if (TransferError != SD_OK)
            {
                return(TransferError);
            }
        }
        else if (DeviceMode == SD_DMA_MODE)
        {
            rt_tick_t tick;

            SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_STBITERR, ENABLE);
            SDIO_DMACmd(ENABLE);
            tick = rt_tick_get();
            DMA_RxConfiguration(readbuff, (NumberOfBlocks * BlockSize));
            while (DMA_GetFlagStatus(DMA2_FLAG_TC4) == RESET)
            {
                if ((TransferError != SD_OK) || (rt_tick_get() - tick > 10))
                {
                    errorstatus = SD_ERROR;
                    // rt_kprintf("sd error\n");
                    return errorstatus;
                }
            }
            while ((TransferEnd == 0) && (TransferError == SD_OK))
            {}
            if (TransferError != SD_OK)
            {
                return(TransferError);
            }
        }
    }
    return(errorstatus);
}

/**
  * @brief  Allows to write one block starting from a specified address
  *   in a card.
  * @param  addr: Address from where data are to be read.
  * @param  writebuff: pointer to the buffer that contain the data to be
  *   transferred.
  * @param  BlockSize: the SD card Data block size.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_WriteBlock(uint32_t addr, uint32_t *writebuff, uint16_t BlockSize)
{
    SD_Error errorstatus = SD_OK;
    uint8_t  power = 0, cardstate = 0;
    uint32_t timeout = 0, bytestransferred = 0;
    uint32_t cardstatus = 0, count = 0, restwords = 0;
    uint32_t *tempbuff = writebuff;

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

    TransferError = SD_OK;
    TransferEnd = 0;
    TotalNumberOfBytes = 0;

    SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
    SDIO_DataInitStructure.SDIO_DataLength = 0;
    SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_1b;
    SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
    SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
    SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Disable;
    SDIO_DataConfig(&SDIO_DataInitStructure);
    SDIO_DMACmd(DISABLE);

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

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        BlockSize = 512;
        // addr /= 512;
    }

    /* Set the block size, both on controller and card */
    if ((BlockSize > 0) && (BlockSize <= 2048) && ((BlockSize & (BlockSize - 1)) == 0))
    {
        power = convert_from_bytes_to_power_of_two(BlockSize);

        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) BlockSize;
        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);
        }
    }
    else
    {
        errorstatus = SD_INVALID_PARAMETER;
        return(errorstatus);
    }

    /* Wait till card is ready for data Added */
    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) (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);
    }

    cardstatus = SDIO_GetResponse(SDIO_RESP1);

    timeout = SD_DATATIMEOUT;

    while (((cardstatus & 0x00000100) == 0) && (timeout > 0))
    {
        timeout--;
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) (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);
        }
        cardstatus = SDIO_GetResponse(SDIO_RESP1);
    }

    if (timeout == 0)
    {
        return(SD_ERROR);
    }

    /* Send CMD24 WRITE_SINGLE_BLOCK */
    SDIO_CmdInitStructure.SDIO_Argument = addr;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_WRITE_SINGLE_BLOCK;
    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_WRITE_SINGLE_BLOCK);

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

    TotalNumberOfBytes = BlockSize;
    StopCondition = 0;
    SrcBuffer = writebuff;

    SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
    SDIO_DataInitStructure.SDIO_DataLength = BlockSize;
    SDIO_DataInitStructure.SDIO_DataBlockSize = (uint32_t) power << 4;
    SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
    SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
    SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
    SDIO_DataConfig(&SDIO_DataInitStructure);

    /* In case of single data block transfer no need of stop command at all */
    if (DeviceMode == SD_POLLING_MODE)
    {
        while (!(SDIO->STA & (SDIO_FLAG_DBCKEND | SDIO_FLAG_TXUNDERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_STBITERR)))
        {
            if (SDIO_GetFlagStatus(SDIO_FLAG_TXFIFOHE) != RESET)
            {
                if ((TotalNumberOfBytes - bytestransferred) < 32)
                {
                    restwords = ((TotalNumberOfBytes - bytestransferred) % 4 == 0) ? ((TotalNumberOfBytes - bytestransferred) / 4) : (( TotalNumberOfBytes -  bytestransferred) / 4 + 1);

                    for (count = 0; count < restwords; count++, tempbuff++, bytestransferred += 4)
                    {
                        SDIO_WriteData(*tempbuff);
                    }
                }
                else
                {
                    for (count = 0; count < 8; count++)
                    {
                        SDIO_WriteData(*(tempbuff + count));
                    }
                    tempbuff += 8;
                    bytestransferred += 32;
                }
            }
        }
        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);
        }
    }
    else if (DeviceMode == SD_INTERRUPT_MODE)
    {
        SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_FLAG_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);
        DMA_TxConfiguration(writebuff, BlockSize);
        SDIO_DMACmd(ENABLE);
        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);
}

/**
  * @brief  Allows to write blocks starting from a specified address in
  *   a card.
  * @param  addr: Address from where data are to be read.
  * @param  writebuff: pointer to the buffer that contain the data to be
  *   transferred.
  * @param  BlockSize: the SD card Data block size.
  * @param  NumberOfBlocks: number of blocks to be written.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_WriteMultiBlocks(uint32_t addr, uint32_t *writebuff, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
    SD_Error errorstatus = SD_OK;
    uint8_t  power = 0, cardstate = 0;
    uint32_t bytestransferred = 0;
    uint32_t count = 0, restwords = 0;
    uint32_t *tempbuff = writebuff;

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

    TransferError = SD_OK;
    TransferEnd = 0;
    TotalNumberOfBytes = 0;

    SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
    SDIO_DataInitStructure.SDIO_DataLength = 0;
    SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_1b;
    SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
    SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
    SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Disable;
    SDIO_DataConfig(&SDIO_DataInitStructure);
    SDIO_DMACmd(DISABLE);

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

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        BlockSize = 512;
        // addr /= 512;
    }

    /* Set the block size, both on controller and card */
    if ((BlockSize > 0) && (BlockSize <= 2048) && ((BlockSize & (BlockSize - 1)) == 0))
    {
        power = convert_from_bytes_to_power_of_two(BlockSize);

        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) BlockSize;
        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);
        }
    }
    else
    {
        errorstatus = SD_INVALID_PARAMETER;
        return(errorstatus);
    }

    /* Wait till card is ready for data Added */
    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) (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);
    }

    if (NumberOfBlocks > 1)
    {
        /* Common to all modes */
        if (NumberOfBlocks * BlockSize > SD_MAX_DATA_LENGTH)
        {
            errorstatus = SD_INVALID_PARAMETER;
            return(errorstatus);
        }

        if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == CardType) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == CardType) || (SDIO_HIGH_CAPACITY_SD_CARD == CardType))
        {
            /* To improve performance */
            SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) (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);
            }
            /* To improve performance */
            SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)NumberOfBlocks;
            SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SET_BLOCK_COUNT;
            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_BLOCK_COUNT);

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

        /* Send CMD25 WRITE_MULT_BLOCK with argument data address */
        SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)addr;
        SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_WRITE_MULT_BLOCK;
        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_WRITE_MULT_BLOCK);

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

        TotalNumberOfBytes = NumberOfBlocks * BlockSize;
        StopCondition = 1;
        SrcBuffer = writebuff;

        SDIO_DataInitStructure.SDIO_DataTimeOut = SD_DATATIMEOUT;
        SDIO_DataInitStructure.SDIO_DataLength = NumberOfBlocks * BlockSize;
        SDIO_DataInitStructure.SDIO_DataBlockSize = (uint32_t) power << 4;
        SDIO_DataInitStructure.SDIO_TransferDir = SDIO_TransferDir_ToCard;
        SDIO_DataInitStructure.SDIO_TransferMode = SDIO_TransferMode_Block;
        SDIO_DataInitStructure.SDIO_DPSM = SDIO_DPSM_Enable;
        SDIO_DataConfig(&SDIO_DataInitStructure);

        if (DeviceMode == SD_POLLING_MODE)
        {
            while (!(SDIO->STA & (SDIO_FLAG_TXUNDERR | SDIO_FLAG_DCRCFAIL | SDIO_FLAG_DATAEND | SDIO_FLAG_DTIMEOUT | SDIO_FLAG_STBITERR)))
            {
                if (SDIO_GetFlagStatus(SDIO_FLAG_TXFIFOHE) != RESET)
                {
                    if (!((TotalNumberOfBytes - bytestransferred) < SD_HALFFIFOBYTES))
                    {
                        for (count = 0; count < SD_HALFFIFO; count++)
                        {
                            SDIO_WriteData(*(tempbuff + count));
                        }
                        tempbuff += SD_HALFFIFO;
                        bytestransferred += SD_HALFFIFOBYTES;
                    }
                    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_STD_CAPACITY_SD_CARD_V1_1 == CardType) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == 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);
}

/**
  * @brief  Gets the cuurent data transfer state.
  * @param  None
  * @retval 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);
    }
}

/**
  * @brief  Aborts an ongoing data transfer.
  * @param  None
  * @retval 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);
}

/**
  * @brief  Allows to erase memory area specified for the given card.
  * @param  startaddr: the start address.
  * @param  endaddr: the end address.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_Erase(uint32_t startaddr, uint32_t endaddr)
{
    SD_Error errorstatus = SD_OK;
    uint32_t delay = 0;
    __IO uint32_t maxdelay = 0;
    uint8_t 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);
    }

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
    {
        startaddr /= 512;
        endaddr /= 512;
    }

    /* According to sd-card spec 1.0 ERASE_GROUP_START (CMD32) and erase_group_end(CMD33) */
    if ((SDIO_STD_CAPACITY_SD_CARD_V1_1 == CardType) || (SDIO_STD_CAPACITY_SD_CARD_V2_0 == 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);
}

/**
  * @brief  Returns the current card's status.
  * @param  pcardstatus: pointer to the buffer that will contain the SD
  *   card status (Card Status register).
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_SendStatus(uint32_t *pcardstatus)
{
    SD_Error errorstatus = SD_OK;

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

    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) 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);
}

/**
  * @brief  Returns the current SD card's status.
  * @param  psdstatus: pointer to the buffer that will contain the SD
  *   card status (SD Status register).
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_SendSDStatus(uint32_t *psdstatus)
{
    SD_Error errorstatus = SD_OK;
    uint32_t 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 = (uint32_t) 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);
}

/**
  * @brief  Allows to process all the interrupts that are high.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_ProcessIRQSrc(void)
{
    uint32_t 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, DISABLE);
        TransferEnd = 1;
        NumberOfBytes = 0;
        return(TransferError);
    }

    if (SDIO_GetITStatus(SDIO_IT_DCRCFAIL) != RESET)
    {
        SDIO_ClearITPendingBit(SDIO_IT_DCRCFAIL);
        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, DISABLE);
        NumberOfBytes = 0;
        TransferError = SD_DATA_CRC_FAIL;
        return(SD_DATA_CRC_FAIL);
    }

    if (SDIO_GetITStatus(SDIO_IT_DTIMEOUT) != RESET)
    {
        SDIO_ClearITPendingBit(SDIO_IT_DTIMEOUT);
        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, DISABLE);
        NumberOfBytes = 0;
        TransferError = SD_DATA_TIMEOUT;
        return(SD_DATA_TIMEOUT);
    }

    if (SDIO_GetITStatus(SDIO_IT_RXOVERR) != RESET)
    {
        SDIO_ClearITPendingBit(SDIO_IT_RXOVERR);
        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, DISABLE);
        NumberOfBytes = 0;
        TransferError = SD_RX_OVERRUN;
        return(SD_RX_OVERRUN);
    }

    if (SDIO_GetITStatus(SDIO_IT_TXUNDERR) != RESET)
    {
        SDIO_ClearITPendingBit(SDIO_IT_TXUNDERR);
        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, DISABLE);
        NumberOfBytes = 0;
        TransferError = SD_TX_UNDERRUN;
        return(SD_TX_UNDERRUN);
    }

    if (SDIO_GetITStatus(SDIO_IT_STBITERR) != RESET)
    {
        SDIO_ClearITPendingBit(SDIO_IT_STBITERR);
        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, DISABLE);
        NumberOfBytes = 0;
        TransferError = SD_START_BIT_ERR;
        return(SD_START_BIT_ERR);
    }

    return(SD_OK);
}

/**
  * @brief  Checks for error conditions for CMD0.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error CmdError(void)
{
    SD_Error errorstatus = SD_OK;
    uint32_t timeout;

    timeout = SDIO_CMD0TIMEOUT; /* 10000 */

    while ((timeout > 0) && (SDIO_GetFlagStatus(SDIO_FLAG_CMDSENT) == RESET))
    {
        timeout--;
    }

    if (timeout == 0)
    {
        errorstatus = SD_CMD_RSP_TIMEOUT;
        return(errorstatus);
    }

    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);

    return(errorstatus);
}

/**
  * @brief  Checks for error conditions for R7.
  *   response.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error CmdResp7Error(void)
{
    SD_Error errorstatus = SD_OK;
    uint32_t status;
    uint32_t timeout = SDIO_CMD0TIMEOUT;

    status = SDIO->STA;

    while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT)) && (timeout > 0))
    {
        timeout--;
        status = SDIO->STA;
    }

    if ((timeout == 0) || (status & SDIO_FLAG_CTIMEOUT))
    {
        /* Card is not V2.0 complient or card does not support the set voltage range */
        errorstatus = SD_CMD_RSP_TIMEOUT;
        SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT);
        return(errorstatus);
    }

    if (status & SDIO_FLAG_CMDREND)
    {
        /* Card is SD V2.0 compliant */
        errorstatus = SD_OK;
        SDIO_ClearFlag(SDIO_FLAG_CMDREND);
        return(errorstatus);
    }
    return(errorstatus);
}

/**
  * @brief  Checks for error conditions for R1.
  *   response
  * @param  cmd: The sent command index.
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error CmdResp1Error(uint8_t cmd)
{
    SD_Error errorstatus = SD_OK;
    uint32_t status;
    uint32_t response_r1;

    status = SDIO->STA;

    while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT)))
    {
        status = SDIO->STA;
    }

    if (status & SDIO_FLAG_CTIMEOUT)
    {
        errorstatus = SD_CMD_RSP_TIMEOUT;
        SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT);
        return(errorstatus);
    }
    else if (status & SDIO_FLAG_CCRCFAIL)
    {
        errorstatus = SD_CMD_CRC_FAIL;
        SDIO_ClearFlag(SDIO_FLAG_CCRCFAIL);
        return(errorstatus);
    }

    /* Check response received is of desired command */
    if (SDIO_GetCommandResponse() != cmd)
    {
        errorstatus = SD_ILLEGAL_CMD;
        return(errorstatus);
    }

    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);

    /* We have received response, retrieve it for analysis  */
    response_r1 = SDIO_GetResponse(SDIO_RESP1);

    if ((response_r1 & SD_OCR_ERRORBITS) == SD_ALLZERO)
    {
        return(errorstatus);
    }

    if (response_r1 & SD_OCR_ADDR_OUT_OF_RANGE)
    {
        return(SD_ADDR_OUT_OF_RANGE);
    }

    if (response_r1 & SD_OCR_ADDR_MISALIGNED)
    {
        return(SD_ADDR_MISALIGNED);
    }

    if (response_r1 & SD_OCR_BLOCK_LEN_ERR)
    {
        return(SD_BLOCK_LEN_ERR);
    }

    if (response_r1 & SD_OCR_ERASE_SEQ_ERR)
    {
        return(SD_ERASE_SEQ_ERR);
    }

    if (response_r1 & SD_OCR_BAD_ERASE_PARAM)
    {
        return(SD_BAD_ERASE_PARAM);
    }

    if (response_r1 & SD_OCR_WRITE_PROT_VIOLATION)
    {
        return(SD_WRITE_PROT_VIOLATION);
    }

    if (response_r1 & SD_OCR_LOCK_UNLOCK_FAILED)
    {
        return(SD_LOCK_UNLOCK_FAILED);
    }

    if (response_r1 & SD_OCR_COM_CRC_FAILED)
    {
        return(SD_COM_CRC_FAILED);
    }

    if (response_r1 & SD_OCR_ILLEGAL_CMD)
    {
        return(SD_ILLEGAL_CMD);
    }

    if (response_r1 & SD_OCR_CARD_ECC_FAILED)
    {
        return(SD_CARD_ECC_FAILED);
    }

    if (response_r1 & SD_OCR_CC_ERROR)
    {
        return(SD_CC_ERROR);
    }

    if (response_r1 & SD_OCR_GENERAL_UNKNOWN_ERROR)
    {
        return(SD_GENERAL_UNKNOWN_ERROR);
    }

    if (response_r1 & SD_OCR_STREAM_READ_UNDERRUN)
    {
        return(SD_STREAM_READ_UNDERRUN);
    }

    if (response_r1 & SD_OCR_STREAM_WRITE_OVERRUN)
    {
        return(SD_STREAM_WRITE_OVERRUN);
    }

    if (response_r1 & SD_OCR_CID_CSD_OVERWRIETE)
    {
        return(SD_CID_CSD_OVERWRITE);
    }

    if (response_r1 & SD_OCR_WP_ERASE_SKIP)
    {
        return(SD_WP_ERASE_SKIP);
    }

    if (response_r1 & SD_OCR_CARD_ECC_DISABLED)
    {
        return(SD_CARD_ECC_DISABLED);
    }

    if (response_r1 & SD_OCR_ERASE_RESET)
    {
        return(SD_ERASE_RESET);
    }

    if (response_r1 & SD_OCR_AKE_SEQ_ERROR)
    {
        return(SD_AKE_SEQ_ERROR);
    }
    return(errorstatus);
}

/**
  * @brief  Checks for error conditions for R3 (OCR).
  *   response.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error CmdResp3Error(void)
{
    SD_Error errorstatus = SD_OK;
    uint32_t status;

    status = SDIO->STA;

    while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT)))
    {
        status = SDIO->STA;
    }

    if (status & SDIO_FLAG_CTIMEOUT)
    {
        errorstatus = SD_CMD_RSP_TIMEOUT;
        SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT);
        return(errorstatus);
    }
    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);
    return(errorstatus);
}

/**
  * @brief  Checks for error conditions for R2 (CID or CSD).
  *   response.
  * @param  None
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error CmdResp2Error(void)
{
    SD_Error errorstatus = SD_OK;
    uint32_t status;

    status = SDIO->STA;

    while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CTIMEOUT | SDIO_FLAG_CMDREND)))
    {
        status = SDIO->STA;
    }

    if (status & SDIO_FLAG_CTIMEOUT)
    {
        errorstatus = SD_CMD_RSP_TIMEOUT;
        SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT);
        return(errorstatus);
    }
    else if (status & SDIO_FLAG_CCRCFAIL)
    {
        errorstatus = SD_CMD_CRC_FAIL;
        SDIO_ClearFlag(SDIO_FLAG_CCRCFAIL);
        return(errorstatus);
    }

    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);

    return(errorstatus);
}

/**
  * @brief  Checks for error conditions for R6 (RCA).
  *   response.
  * @param  cmd: The sent command index.
  * @param  prca: pointer to the variable that will contain the SD
  *   card relative address RCA.
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error CmdResp6Error(uint8_t cmd, uint16_t *prca)
{
    SD_Error errorstatus = SD_OK;
    uint32_t status;
    uint32_t response_r1;

    status = SDIO->STA;

    while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CTIMEOUT | SDIO_FLAG_CMDREND)))
    {
        status = SDIO->STA;
    }

    if (status & SDIO_FLAG_CTIMEOUT)
    {
        errorstatus = SD_CMD_RSP_TIMEOUT;
        SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT);
        return(errorstatus);
    }
    else if (status & SDIO_FLAG_CCRCFAIL)
    {
        errorstatus = SD_CMD_CRC_FAIL;
        SDIO_ClearFlag(SDIO_FLAG_CCRCFAIL);
        return(errorstatus);
    }

    /* Check response received is of desired command */
    if (SDIO_GetCommandResponse() != cmd)
    {
        errorstatus = SD_ILLEGAL_CMD;
        return(errorstatus);
    }

    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);

    /* We have received response, retrieve it.  */
    response_r1 = SDIO_GetResponse(SDIO_RESP1);

    if (SD_ALLZERO == (response_r1 & (SD_R6_GENERAL_UNKNOWN_ERROR | SD_R6_ILLEGAL_CMD | SD_R6_COM_CRC_FAILED)))
    {
        *prca = (uint16_t) (response_r1 >> 16);
        return(errorstatus);
    }

    if (response_r1 & SD_R6_GENERAL_UNKNOWN_ERROR)
    {
        return(SD_GENERAL_UNKNOWN_ERROR);
    }

    if (response_r1 & SD_R6_ILLEGAL_CMD)
    {
        return(SD_ILLEGAL_CMD);
    }

    if (response_r1 & SD_R6_COM_CRC_FAILED)
    {
        return(SD_COM_CRC_FAILED);
    }

    return(errorstatus);
}

/**
  * @brief  Enables or disables the SDIO wide bus mode.
  * @param  NewState: new state of the SDIO wide bus mode.
  *   This parameter can be: ENABLE or DISABLE.
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error SDEnWideBus(FunctionalState NewState)
{
    SD_Error errorstatus = SD_OK;

    uint32_t scr[2] = {0, 0};

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

    /* Get SCR Register */
    errorstatus = FindSCR(RCA, scr);

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

    /* If wide bus operation to be enabled */
    if (NewState == ENABLE)
    {
        /* If requested card supports wide bus operation */
        if ((scr[1] & SD_WIDE_BUS_SUPPORT) != SD_ALLZERO)
        {
            /* Send CMD55 APP_CMD with argument as card's RCA.*/
            SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) 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);
            }

            /* Send ACMD6 APP_CMD with argument as 2 for wide bus mode */
            SDIO_CmdInitStructure.SDIO_Argument = 0x2;
            SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_APP_SD_SET_BUSWIDTH;
            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_SD_SET_BUSWIDTH);

            if (errorstatus != SD_OK)
            {
                return(errorstatus);
            }
            return(errorstatus);
        }
        else
        {
            errorstatus = SD_REQUEST_NOT_APPLICABLE;
            return(errorstatus);
        }
    }   /* If wide bus operation to be disabled */
    else
    {
        /* If requested card supports 1 bit mode operation */
        if ((scr[1] & SD_SINGLE_BUS_SUPPORT) != SD_ALLZERO)
        {
            /* Send CMD55 APP_CMD with argument as card's RCA.*/
            SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) 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);
            }

            /* Send ACMD6 APP_CMD with argument as 2 for wide bus mode */
            SDIO_CmdInitStructure.SDIO_Argument = 0x00;
            SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_APP_SD_SET_BUSWIDTH;
            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_SD_SET_BUSWIDTH);

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

            return(errorstatus);
        }
        else
        {
            errorstatus = SD_REQUEST_NOT_APPLICABLE;
            return(errorstatus);
        }
    }
}

/**
  * @brief  Checks if the SD card is in programming state.
  * @param  pstatus: pointer to the variable that will contain the SD
  *   card state.
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error IsCardProgramming(uint8_t *pstatus)
{
    SD_Error errorstatus = SD_OK;
    __IO uint32_t respR1 = 0, status = 0;

    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) 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);

    status = SDIO->STA;
    while (!(status & (SDIO_FLAG_CCRCFAIL | SDIO_FLAG_CMDREND | SDIO_FLAG_CTIMEOUT)))
    {
        status = SDIO->STA;
    }

    if (status & SDIO_FLAG_CTIMEOUT)
    {
        errorstatus = SD_CMD_RSP_TIMEOUT;
        SDIO_ClearFlag(SDIO_FLAG_CTIMEOUT);
        return(errorstatus);
    }
    else if (status & SDIO_FLAG_CCRCFAIL)
    {
        errorstatus = SD_CMD_CRC_FAIL;
        SDIO_ClearFlag(SDIO_FLAG_CCRCFAIL);
        return(errorstatus);
    }

    status = (uint32_t)SDIO_GetCommandResponse();

    /* Check response received is of desired command */
    if (status != SDIO_SEND_STATUS)
    {
        errorstatus = SD_ILLEGAL_CMD;
        return(errorstatus);
    }

    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);


    /* We have received response, retrieve it for analysis  */
    respR1 = SDIO_GetResponse(SDIO_RESP1);

    /* Find out card status */
    *pstatus = (uint8_t) ((respR1 >> 9) & 0x0000000F);

    if ((respR1 & SD_OCR_ERRORBITS) == SD_ALLZERO)
    {
        return(errorstatus);
    }

    if (respR1 & SD_OCR_ADDR_OUT_OF_RANGE)
    {
        return(SD_ADDR_OUT_OF_RANGE);
    }

    if (respR1 & SD_OCR_ADDR_MISALIGNED)
    {
        return(SD_ADDR_MISALIGNED);
    }

    if (respR1 & SD_OCR_BLOCK_LEN_ERR)
    {
        return(SD_BLOCK_LEN_ERR);
    }

    if (respR1 & SD_OCR_ERASE_SEQ_ERR)
    {
        return(SD_ERASE_SEQ_ERR);
    }

    if (respR1 & SD_OCR_BAD_ERASE_PARAM)
    {
        return(SD_BAD_ERASE_PARAM);
    }

    if (respR1 & SD_OCR_WRITE_PROT_VIOLATION)
    {
        return(SD_WRITE_PROT_VIOLATION);
    }

    if (respR1 & SD_OCR_LOCK_UNLOCK_FAILED)
    {
        return(SD_LOCK_UNLOCK_FAILED);
    }

    if (respR1 & SD_OCR_COM_CRC_FAILED)
    {
        return(SD_COM_CRC_FAILED);
    }

    if (respR1 & SD_OCR_ILLEGAL_CMD)
    {
        return(SD_ILLEGAL_CMD);
    }

    if (respR1 & SD_OCR_CARD_ECC_FAILED)
    {
        return(SD_CARD_ECC_FAILED);
    }

    if (respR1 & SD_OCR_CC_ERROR)
    {
        return(SD_CC_ERROR);
    }

    if (respR1 & SD_OCR_GENERAL_UNKNOWN_ERROR)
    {
        return(SD_GENERAL_UNKNOWN_ERROR);
    }

    if (respR1 & SD_OCR_STREAM_READ_UNDERRUN)
    {
        return(SD_STREAM_READ_UNDERRUN);
    }

    if (respR1 & SD_OCR_STREAM_WRITE_OVERRUN)
    {
        return(SD_STREAM_WRITE_OVERRUN);
    }

    if (respR1 & SD_OCR_CID_CSD_OVERWRIETE)
    {
        return(SD_CID_CSD_OVERWRITE);
    }

    if (respR1 & SD_OCR_WP_ERASE_SKIP)
    {
        return(SD_WP_ERASE_SKIP);
    }

    if (respR1 & SD_OCR_CARD_ECC_DISABLED)
    {
        return(SD_CARD_ECC_DISABLED);
    }

    if (respR1 & SD_OCR_ERASE_RESET)
    {
        return(SD_ERASE_RESET);
    }

    if (respR1 & SD_OCR_AKE_SEQ_ERROR)
    {
        return(SD_AKE_SEQ_ERROR);
    }

    return(errorstatus);
}

/**
  * @brief  Find the SD card SCR register value.
  * @param  rca: selected card address.
  * @param  pscr: pointer to the buffer that will contain the SCR value.
  * @retval SD_Error: SD Card Error code.
  */
static SD_Error FindSCR(uint16_t rca, uint32_t *pscr)
{
    uint32_t index = 0;
    SD_Error errorstatus = SD_OK;
    uint32_t tempscr[2] = {0, 0};

    /* Set Block Size To 8 Bytes */
    /* Send CMD55 APP_CMD with argument as card's RCA */
    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)8;
    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);
    }

    /* Send CMD55 APP_CMD with argument as card's RCA */
    SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) 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 = 8;
    SDIO_DataInitStructure.SDIO_DataBlockSize = SDIO_DataBlockSize_8b;
    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);

    /* make a delay */
    {
        volatile uint32_t delay;
        for(delay = 0; delay < 20; delay++);
    }

    /* Send ACMD51 SD_APP_SEND_SCR with argument as 0 */
    SDIO_CmdInitStructure.SDIO_Argument = 0x0;
    SDIO_CmdInitStructure.SDIO_CmdIndex = SDIO_SD_APP_SEND_SCR;
    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_SEND_SCR);

    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_RXDAVL) != RESET)
        {
            *(tempscr + index) = SDIO_ReadData();
            index++;
        }
    }

    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);
    }

    /* Clear all the static flags */
    SDIO_ClearFlag(SDIO_STATIC_FLAGS);

    *(pscr + 1) = ((tempscr[0] & SD_0TO7BITS) << 24) | ((tempscr[0] & SD_8TO15BITS) << 8) | ((tempscr[0] & SD_16TO23BITS) >> 8) | ((tempscr[0] & SD_24TO31BITS) >> 24);

    *(pscr) = ((tempscr[1] & SD_0TO7BITS) << 24) | ((tempscr[1] & SD_8TO15BITS) << 8) | ((tempscr[1] & SD_16TO23BITS) >> 8) | ((tempscr[1] & SD_24TO31BITS) >> 24);

    return(errorstatus);
}

/**
  * @brief  Converts the number of bytes in power of two and returns the
  *   power.
  * @param  NumberOfBytes: number of bytes.
  * @retval None
  */
static uint8_t convert_from_bytes_to_power_of_two(uint16_t NumberOfBytes)
{
    uint8_t count = 0;

    while (NumberOfBytes != 1)
    {
        NumberOfBytes >>= 1;
        count++;
    }
    return(count);
}

/**
  * @brief  Configures the SDIO Corresponding GPIO Ports
  * @param  None
  * @retval None
  */
static void GPIO_Configuration(void)
{
    GPIO_InitTypeDef  GPIO_InitStructure;

    /* GPIOC and GPIOD Periph clock enable */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);

    /* Configure PC.08, PC.09, PC.10, PC.11, PC.12 pin: D0, D1, D2, D3, CLK pin */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8 | GPIO_Pin_9 | GPIO_Pin_10 | GPIO_Pin_11 | GPIO_Pin_12;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOC, &GPIO_InitStructure);

    /* Configure PD.02 CMD line */
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_Init(GPIOD, &GPIO_InitStructure);
}

/**
  * @brief  Configures the DMA2 Channel4 for SDIO Tx request.
  * @param  BufferSRC: pointer to the source buffer
  * @param  BufferSize: buffer size
  * @retval None
  */
static void DMA_TxConfiguration(uint32_t *BufferSRC, uint32_t BufferSize)
{
    DMA_InitTypeDef DMA_InitStructure;

    DMA_ClearFlag(DMA2_FLAG_TC4 | DMA2_FLAG_TE4 | DMA2_FLAG_HT4 | DMA2_FLAG_GL4);

    /* DMA2 Channel4 disable */
    DMA_Cmd(DMA2_Channel4, DISABLE);

    /* DMA2 Channel4 Config */
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SDIO_FIFO_Address;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)BufferSRC;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
    DMA_InitStructure.DMA_BufferSize = BufferSize / 4;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA2_Channel4, &DMA_InitStructure);

    /* DMA2 Channel4 enable */
    DMA_Cmd(DMA2_Channel4, ENABLE);
}

/**
  * @brief  Configures the DMA2 Channel4 for SDIO Rx request.
  * @param  BufferDST: pointer to the destination buffer
  * @param  BufferSize: buffer size
  * @retval None
  */
static void DMA_RxConfiguration(uint32_t *BufferDST, uint32_t BufferSize)
{
    DMA_InitTypeDef DMA_InitStructure;

    DMA_ClearFlag(DMA2_FLAG_TC4 | DMA2_FLAG_TE4 | DMA2_FLAG_HT4 | DMA2_FLAG_GL4);

    /* DMA2 Channel4 disable */
    DMA_Cmd(DMA2_Channel4, DISABLE);

    /* DMA2 Channel4 Config */
    DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)SDIO_FIFO_Address;
    DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)BufferDST;
    DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
    DMA_InitStructure.DMA_BufferSize = BufferSize / 4;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_High;
    DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
    DMA_Init(DMA2_Channel4, &DMA_InitStructure);

    /* DMA2 Channel4 enable */
    DMA_Cmd(DMA2_Channel4, ENABLE);
}

/**
  * @}
  */

/**
  * @}
  */

/******************* (C) COPYRIGHT 2009 STMicroelectronics *****END OF FILE****/

/*
 * RT-Thread SD Card Driver
 * 20100715 Bernard support SDHC card great than 4G.
 */
#include <rtthread.h>
#include <dfs_fs.h>

/* set sector size to 512 */
#define SECTOR_SIZE		512

static struct rt_device sdcard_device;
static SD_CardInfo SDCardInfo;
static struct dfs_partition part;
static struct rt_semaphore sd_lock;
static rt_uint8_t _sdcard_buffer[SECTOR_SIZE];

/* RT-Thread Device Driver Interface */
static rt_err_t rt_sdcard_init(rt_device_t dev)
{
    NVIC_InitTypeDef NVIC_InitStructure;

    NVIC_InitStructure.NVIC_IRQChannel = SDIO_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    if (rt_sem_init(&sd_lock, "sdlock", 1, RT_IPC_FLAG_FIFO) != RT_EOK)
    {
        rt_kprintf("init sd lock semaphore failed\n");
    }

    return RT_EOK;
}

static rt_err_t rt_sdcard_open(rt_device_t dev, rt_uint16_t oflag)
{
    return RT_EOK;
}

static rt_err_t rt_sdcard_close(rt_device_t dev)
{
    return RT_EOK;
}

static rt_size_t rt_sdcard_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
{
    SD_Error status;
    rt_uint32_t retry;
    rt_uint32_t factor;

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD) factor = 1;
    else factor = SECTOR_SIZE;

    rt_sem_take(&sd_lock, RT_WAITING_FOREVER);

    retry = 3;
    while(retry)
    {
        /* read all sectors */
        if (((rt_uint32_t)buffer % 4 != 0) ||
                ((rt_uint32_t)buffer > 0x20080000))
        {
            rt_uint32_t index;

            /* which is not alignment with 4 or chip SRAM */
            for (index = 0; index < size; index ++)
            {
                status = SD_ReadBlock((part.offset + index + pos) * factor,
                                      (uint32_t*)_sdcard_buffer, SECTOR_SIZE);

                if (status != SD_OK) break;

                /* copy to the buffer */
                rt_memcpy(((rt_uint8_t*)buffer + index * SECTOR_SIZE), _sdcard_buffer, SECTOR_SIZE);
            }
        }
        else
        {
            if (size == 1)
            {
                status = SD_ReadBlock((part.offset + pos) * factor,
                                      (uint32_t*)buffer, SECTOR_SIZE);
            }
            else
            {
                status = SD_ReadMultiBlocks((part.offset + pos) * factor,
                                            (uint32_t*)buffer, SECTOR_SIZE, size);
            }
        }

        if (status == SD_OK) break;

        retry --;
    }
    rt_sem_release(&sd_lock);

    if (status == SD_OK) return size;

    rt_kprintf("read failed: %d, buffer 0x%08x\n", status, buffer);
    return 0;
}

static rt_size_t rt_sdcard_write (rt_device_t dev, rt_off_t pos, const void* buffer, rt_size_t size)
{
    SD_Error status;
    rt_uint32_t factor;

    if (CardType == SDIO_HIGH_CAPACITY_SD_CARD) factor = 1;
    else factor = SECTOR_SIZE;

    rt_sem_take(&sd_lock, RT_WAITING_FOREVER);

    /* read all sectors */
    if (((rt_uint32_t)buffer % 4 != 0) ||
            ((rt_uint32_t)buffer > 0x20080000))
    {
        rt_uint32_t index;

        /* which is not alignment with 4 or not chip SRAM */
        for (index = 0; index < size; index ++)
        {
            /* copy to the buffer */
            rt_memcpy(_sdcard_buffer, ((rt_uint8_t*)buffer + index * SECTOR_SIZE), SECTOR_SIZE);

            status = SD_WriteBlock((part.offset + index + pos) * factor,
                                   (uint32_t*)_sdcard_buffer, SECTOR_SIZE);

            if (status != SD_OK) break;
        }
    }
    else
    {
        if (size == 1)
        {
            status = SD_WriteBlock((part.offset + pos) * factor,
                                   (uint32_t*)buffer, SECTOR_SIZE);
        }
        else
        {
            status = SD_WriteMultiBlocks((part.offset + pos) * factor,
                                         (uint32_t*)buffer, SECTOR_SIZE, size);
        }
    }

    rt_sem_release(&sd_lock);

    if (status == SD_OK) return size;

    rt_kprintf("write failed: %d, buffer 0x%08x\n", status, buffer);
    return 0;
}

static rt_err_t rt_sdcard_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
    RT_ASSERT(dev != RT_NULL);

    if (cmd == RT_DEVICE_CTRL_BLK_GETGEOME)
    {
        struct rt_device_blk_geometry *geometry;

        geometry = (struct rt_device_blk_geometry *)args;
        if (geometry == RT_NULL) return -RT_ERROR;

        geometry->bytes_per_sector = 512;
        geometry->block_size = SDCardInfo.CardBlockSize;
        if (CardType == SDIO_HIGH_CAPACITY_SD_CARD)
            geometry->sector_count = (SDCardInfo.SD_csd.DeviceSize + 1)  * 1024;
        else
            geometry->sector_count = SDCardInfo.CardCapacity/SDCardInfo.CardBlockSize;
    }

    return RT_EOK;
}

int rt_hw_sdcard_init(void)
{
    /* SDIO POWER */
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC,ENABLE);
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init(GPIOC,&GPIO_InitStructure);
    GPIO_ResetBits(GPIOC,GPIO_Pin_6); /* SD card power up */
    // delay same time for SD card power up

    if (SD_Init() == SD_OK)
    {
        SD_Error status;
        rt_uint8_t *sector;

        status = SD_GetCardInfo(&SDCardInfo);
        if (status != SD_OK) goto __return;

        status = SD_SelectDeselect((u32) (SDCardInfo.RCA << 16));
        if (status != SD_OK) goto __return;

        SD_EnableWideBusOperation(SDIO_BusWide_4b);
        SD_SetDeviceMode(SD_DMA_MODE);

        /* get the first sector to read partition table */
        sector = (rt_uint8_t*) rt_malloc (512);
        if (sector == RT_NULL)
        {
            rt_kprintf("allocate partition sector buffer failed\n");
            return 0;
        }
        status = SD_ReadBlock(0, (uint32_t*)sector, 512);
        if (status == SD_OK)
        {
            /* get the first partition */
            if (dfs_filesystem_get_partition(&part, sector, 0) != 0)
            {
                /* there is no partition */
                part.offset = 0;
                part.size   = 0;
            }
        }
        else
        {
            /* there is no partition table */
            part.offset = 0;
            part.size   = 0;
        }

        /* release sector buffer */
        rt_free(sector);

        /* register sdcard device */
        sdcard_device.type  = RT_Device_Class_Block;
        sdcard_device.init 	= rt_sdcard_init;
        sdcard_device.open 	= rt_sdcard_open;
        sdcard_device.close = rt_sdcard_close;
        sdcard_device.read 	= rt_sdcard_read;
        sdcard_device.write = rt_sdcard_write;
        sdcard_device.control = rt_sdcard_control;

        /* no private */
        sdcard_device.user_data = &SDCardInfo;

        rt_device_register(&sdcard_device, "sd0",
                           RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_REMOVABLE | RT_DEVICE_FLAG_STANDALONE);

        return 0;
    }

__return:
    rt_kprintf("sdcard init failed\n");
    GPIO_SetBits(GPIOC,GPIO_Pin_6); /* SD card power down */

    return 0;
}
INIT_DEVICE_EXPORT(rt_hw_sdcard_init);

void SDIO_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    /* Process All SDIO Interrupt Sources */
    SD_ProcessIRQSrc();

    /* leave interrupt */
    rt_interrupt_leave();
}