STM32控制 MP3程序自带UI界面 -

标题: STM32控制 MP3程序自带UI界面 [打印本页]

作者: user2402166 时间: 2019-7-17 15:50
标题: STM32控制 MP3程序自带UI界面
int main(void)
{
CPU_INT08U  os_err;
      os_err = os_err; /* prevent warning... */

      CPU_IntDis();                   /* Disable all ints until we are ready to accept them.  */

OSInit();                      /* Initialize "uC/OS-II, The Real-Time Kernel".       */

      os_err = OSTaskCreateExt((void (*)(void *)) App_TaskStart,  /* Create the start task.                            */
                           (void       * ) 0,
                           (OS_STK       * )&App_TaskStartStk[APP_TASK_START_STK_SIZE - 1],
                           (INT8U          ) APP_TASK_START_PRIO,
                           (INT16U       ) APP_TASK_START_PRIO,
                           (OS_STK       * )&App_TaskStartStk[0],
                           (INT32U       ) APP_TASK_START_STK_SIZE,
                           (void       * )0,
                           (INT16U       )(OS_TASK_OPT_STK_CLR | OS_TASK_OPT_STK_CHK));

#if OS_TASK_NAME_EN > 0
OSTaskNameSet(APP_TASK_START_PRIO, (CPU_INT08U *)"Start Task", &os_err);
#endif

      OSStart();             /* Start multitasking (i.e. give control to uC/OS-II).  */

      return (0);
}

#include "vs1003.h"

/* Private variables ---------------------------------------------------------*/

/* VS1003设置参数 */
/* 0 , henh.1 , hfreq.2 , lenh.3 , lfreq 5 ,主音量 */
uint8_t vs1003ram[5] = { 0 , 0 , 0 , 0 , 250 };

/*******************************************************************************
* Function Name  : VS1003_SPI_Init
* Description : VS1003 SPI Init
* Input       : None
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
static void VS1003_SPI_Init(void)
{
  SPI_InitTypeDef  SPI_InitStructure;

  RCC_APB2PeriphClockCmd( RCC_APB2Periph_SPI1, ENABLE);
  /* SPI1 configuration */
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

  /* Enable SPI1  */
  SPI_Cmd(SPI1, ENABLE);
}

/*******************************************************************************
* Function Name  : VS1003_SPI_SetSpeed
* Description : None
* Input       : - SpeedSet: SPI_SPEED_HIGH 1  SPI_SPEED_LOW 0
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
static void VS1003_SPI_SetSpeed( uint8_t SpeedSet)
{
  SPI_InitTypeDef SPI_InitStructure ;

  SPI_InitStructure.SPI_Direction=SPI_Direction_2Lines_FullDuplex ;
  SPI_InitStructure.SPI_Mode=SPI_Mode_Master ;
  SPI_InitStructure.SPI_DataSize=SPI_DataSize_8b ;
  SPI_InitStructure.SPI_CPOL=SPI_CPOL_High ;
  SPI_InitStructure.SPI_CPHA=SPI_CPHA_2Edge ;
  SPI_InitStructure.SPI_NSS=SPI_NSS_Soft ;

  if( SpeedSet == SPI_SPEED_LOW )
  {
   SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_128;
  }
  else
  {
   SPI_InitStructure.SPI_BaudRatePrescaler=SPI_BaudRatePrescaler_8;
  }
  SPI_InitStructure.SPI_FirstBit=SPI_FirstBit_MSB ;
  SPI_InitStructure.SPI_CRCPolynomial=7 ;
  SPI_Init(SPI1,&SPI_InitStructure);
}

/*******************************************************************************
* Function Name  : VS1003_SPI_ReadWriteByte
* Description : None
* Input       : - TxData: Write Byte
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
static uint8_t VS1003_SPI_ReadWriteByte( uint8_t TxData )
{
  /* Loop while DR register in not emplty */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

  /* Send byte through the SPI1 peripheral */
  SPI_I2S_SendData(SPI1, TxData);

  /* Wait to receive a byte */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

  /* Return the byte read from the SPI bus */
  return SPI_I2S_ReceiveData(SPI1);
}

/*******************************************************************************
* Function Name  : VS1003_Init
* Description : VS1003端口初始化
* Input       : None
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
void VS1003_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOC , ENABLE);
  /* Configure SPI1 pins: SCK, MISO and MOSI ---------------------------------*/
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5  | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOA, &GPIO_InitStructure);
  /* XCS */
  GPIO_InitStructure.GPIO_Pin =  GPIO_Pin_5 | GPIO_Pin_6;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
  /* DREQ */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(GPIOC, &GPIO_InitStructure);

  MP3_DCS(1);
  MP3_CCS(1);

  VS1003_SPI_Init();
}

/*******************************************************************************
* Function Name  : delay_ms
* Description : delay time
* Input       : - ms: time
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
static void delay_ms(uint32_t ms)
{
uint32_t len;
for (;ms > 0; ms --)
      for (len = 0; len < 100; len++ );
}

/*******************************************************************************
* Function Name  : VS1003_WriteReg
* Description : VS1003写寄存器
* Input       : - reg: 命令地址
*                                  - value: 命令数据
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
static void VS1003_WriteReg( uint8_t reg,uint16_t value )
{
while(  MP3_DREQ == 0 );          /* 等待空闲 */

VS1003_SPI_SetSpeed( SPI_SPEED_LOW );
MP3_DCS(1);
MP3_CCS(0);
VS1003_SPI_ReadWriteByte(VS_WRITE_COMMAND); /* 发送VS1003的写命令 */
VS1003_SPI_ReadWriteByte(reg);
VS1003_SPI_ReadWriteByte(value>>8);
VS1003_SPI_ReadWriteByte(value);
MP3_CCS(1);
VS1003_SPI_SetSpeed( SPI_SPEED_HIGH );
}

/*******************************************************************************
* Function Name  : VS1003_ReadReg
* Description : VS1003读寄存器
* Input       : - reg: 命令地址
* Output       : None
* Return       : - value: 数据
* Attention                : None
*******************************************************************************/
uint16_t VS1003_ReadReg( uint8_t reg)
{
uint16_t value;

while(  MP3_DREQ == 0 );          /* 等待空闲 */
VS1003_SPI_SetSpeed( SPI_SPEED_LOW );
MP3_DCS(1);
MP3_CCS(0);
VS1003_SPI_ReadWriteByte(VS_READ_COMMAND);/* 发送VS1003的读命令 */
VS1003_SPI_ReadWriteByte( reg );
value = VS1003_SPI_ReadWriteByte(0xff);
value = value << 8;
value |= VS1003_SPI_ReadWriteByte(0xff);
MP3_CCS(1);
VS1003_SPI_SetSpeed( SPI_SPEED_HIGH );
return value;
}

/*******************************************************************************
* Function Name  : VS1003_GetBitrate
* Description : 得到mp3&wma的波特率
* Input       : None
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
uint16_t VS1003_GetBitrate(void)
{
      uint16_t head0;
      uint16_t head1;
const uint16_t bitrate[2][16]={ {0,8,16,24,32,40,48,56,64,80,96,112,128,144,160,0},
                                 {0,32,40,48,56,64,80,96,112,128,160,192,224,256,320,0}};

head0 = VS1003_ReadReg(SPI_HDAT0);
head1 = VS1003_ReadReg(SPI_HDAT1);

switch( head1 )
{
      case 0x7665:       /* WAV格式 */
                  return 0;
      case 0X4D54:       /* MIDI格式 */
                  return 1;
      case 0X574D:    /* WMA格式 */
         head1 = head0 * 2 / 25;
         if( ( head1 % 10 ) > 5 )
                     {
                           return head1 / 10 + 1;
                     }
         else
                     {
                           return head1 / 10;
                     }
      default:       /* MP3格式 */
         head1 >>= 3;
         head1 = head1 & 0x03;
         if( head1 == 3 )
                     {
                        head1 = 1;
                     }
         else
                     {
                        head1 = 0;
                     }
         return bitrate[head1][head0>>12];
}
}

/*******************************************************************************
* Function Name  : VS1003_ResetDecodeTime
* Description : None
* Input       : None
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
void VS1003_ResetDecodeTime(void)
{
VS1003_WriteReg(SPI_DECODE_TIME,0x0000);
VS1003_WriteReg(SPI_DECODE_TIME,0x0000); /* 操作两次 */
}

/*******************************************************************************
* Function Name  : VS1003_GetDecodeTime
* Description : None
* Input       : None
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
uint16_t VS1003_GetDecodeTime(void)
{
return VS1003_ReadReg(SPI_DECODE_TIME);
}

/*******************************************************************************
* Function Name  : VS1003_SoftReset
* Description : VS1003软复位
* Input       : None
* Output       : None
* Return       : None
* Attention                : None
*******************************************************************************/
void VS1003_SoftReset(void)
{
uint8_t retry;

while(  MP3_DREQ == 0 );             /* 等待软件复位结束 */
VS1003_SPI_ReadWriteByte(0xff);       /* 启动传输 */
retry = 0;
while( VS1003_ReadReg(0) != 0x0804 ) /* 软件复位,新模式 */
{
         VS1003_WriteReg(SPI_MODE,0x0804);  /* 软件复位,新模式 */
         delay_ms(2);                      /* 等待至少1.35ms */
         if( retry++ > 100 )
         {
            break;
         }
}

while(  MP3_DREQ ==0 ); /* 等待软件复位结束 */

retry = 0;

while( VS1003_ReadReg(SPI_CLOCKF) != 0X9800 ) /* 设置vs1003的时钟,3倍频 ,1.5xADD */
{
         VS1003_WriteReg(SPI_CLOCKF,0X9800);    /* 设置vs1003的时钟,3倍频 ,1.5xADD */
         if( retry++ > 100 )
         {
            break;
         }
}
retry = 0;

while( VS1003_ReadReg(SPI_AUDATA) != 0XBB81 ) /* 设置vs1003的时钟,3倍频 ,1.5xADD */
{
         VS1003_WriteReg(SPI_AUDATA,0XBB81);
         if( retry++ > 100 )
         {
            break;
         }
}

VS1003_WriteReg(11,0x2020);       /* 音量 */
VS1003_ResetDecodeTime();    /* 复位解码时间 */
/* 向vs1003发送4个字节无效数据，用以启动SPI发送 */
MP3_DCS(0);  /* 选中数据传输 */
VS1003_SPI_ReadWriteByte(0XFF);
VS1003_SPI_ReadWriteByte(0XFF);
VS1003_SPI_ReadWriteByte(0XFF);
VS1003_SPI_ReadWriteByte(0XFF);
MP3_DCS(1);  /* 取消数据传输 */
delay_ms(20);
}

void VS1003_Reset(void)
{
delay_ms(20);
VS1003_SPI_ReadWriteByte(0XFF);
MP3_DCS(1);             /* 取消数据传输 */
MP3_CCS(1);             /* 取消数据传输 */

while(  MP3_DREQ ==0 );  /* 等待DREQ为高 */
delay_ms(20);
}

/void VS1003_SineTest(void)
{
VS1003_WriteReg(0x0b,0X2020);       /* 设置音量 */
VS1003_WriteReg(SPI_MODE,0x0820); /* 进入vs1003的测试模式 */
while(  MP3_DREQ == 0 );  /* 等待DREQ为高 */

/* 向vs1003发送正弦测试命令：0x53 0xef 0x6e n 0x00 0x00 0x00 0x00 */
MP3_DCS(0);/* 选中数据传输 */
VS1003_SPI_ReadWriteByte(0x53);
VS1003_SPI_ReadWriteByte(0xef);
VS1003_SPI_ReadWriteByte(0x6e);
VS1003_SPI_ReadWriteByte(0x24);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
delay_ms(100);
MP3_DCS(1);
/* 退出正弦测试 */
MP3_DCS(0);/* 选中数据传输 */
VS1003_SPI_ReadWriteByte(0x45);
VS1003_SPI_ReadWriteByte(0x78);
VS1003_SPI_ReadWriteByte(0x69);
VS1003_SPI_ReadWriteByte(0x74);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
delay_ms(100);
MP3_DCS(1);

/* 再次进入正弦测试并设置n值为0x44，即将正弦波的频率设置为另外的值 */
MP3_DCS(0);/* 选中数据传输 */
VS1003_SPI_ReadWriteByte(0x53);
VS1003_SPI_ReadWriteByte(0xef);
VS1003_SPI_ReadWriteByte(0x6e);
VS1003_SPI_ReadWriteByte(0x44);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
delay_ms(100);
MP3_DCS(1);
/* 退出正弦测试 */
MP3_DCS(0);/* 选中数据传输 */
VS1003_SPI_ReadWriteByte(0x45);
VS1003_SPI_ReadWriteByte(0x78);
VS1003_SPI_ReadWriteByte(0x69);
VS1003_SPI_ReadWriteByte(0x74);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
delay_ms(100);
MP3_DCS(1);
}

void VS1003_RamTest(void)
{
volatile uint16_t value;

VS1003_Reset();
VS1003_WriteReg(SPI_MODE,0x0820); /* 进入vs1003的测试模式 */
while(  MP3_DREQ == 0 );       /* 等待DREQ为高 */
MP3_DCS(0);                                           /* xDCS = 1，选择vs1003的数据接口 */
VS1003_SPI_ReadWriteByte(0x4d);
VS1003_SPI_ReadWriteByte(0xea);
VS1003_SPI_ReadWriteByte(0x6d);
VS1003_SPI_ReadWriteByte(0x54);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
VS1003_SPI_ReadWriteByte(0x00);
delay_ms(50);
MP3_DCS(1);
value = VS1003_ReadReg(SPI_HDAT0); /* 如果得到的值为0x807F，则表明完好 */
}

* Description : 设定vs1003播放的音量和高低音void VS1003_SetVol(void)
{
uint8_t i;
uint16_t bass=0;  /* 暂存音调寄存器值 */
uint16_t volt=0;  /* 暂存音量值 */
uint8_t  vset=0;  /* 暂存音量值 */

vset = 255 - vs1003ram[4]; /* 取反得到最大值 */
volt =vset;
volt <<= 8;
volt += vset;/* 得到音量设置后大小 */
/* 0,henh.1,hfreq.2,lenh.3,lfreq */
for( i = 0; i < 4; i++ )
{
   bass <<= 4;
   bass += vs1003ram;
}
VS1003_WriteReg(SPI_BASS,bass);/* BASS */
VS1003_WriteReg(SPI_VOL,volt); /* 设音量 */
}

* Description : VS1003写数据

void VS1003_WriteData( uint8_t * buf)
{
uint8_t  count = 32;

MP3_DCS(0);
while( count-- )
{
      VS1003_SPI_ReadWriteByte( *buf++ );
}
MP3_DCS(1);
MP3_CCS(1);
}

/* Description : VS1003录音初始化
* Input       : None
* Output       : None
* Return       : None
* Attention                : VS1003录音初始化成功之后可以听到耳机有回放
*  /             此时不能用喇叭容易产生自激

void VS1003_Record_Init(void)
{
  uint8_t retry;

  /* 配置时钟 */
  while( VS1003_ReadReg(SPI_CLOCKF) != 0x9800 )
  {
      VS1003_WriteReg(SPI_CLOCKF,0x9800);
      delay_ms(2);                      /* 等待至少1.35ms */
      if( retry++ > 100 )
      {
            break;
      }
  }

  while( VS1003_ReadReg(SPI_BASS) != 0x0000 )
  {
      VS1003_WriteReg(SPI_CLOCKF,0x0000);
      delay_ms(2);                      /* 等待至少1.35ms */
      if( retry++ > 100 )
      {
            break;
      }
  }

  /* Set sample rate divider=12 */
  while( VS1003_ReadReg(SPI_AICTRL0) != 0x0012 )
  {
      VS1003_WriteReg(SPI_AICTRL0,0x0012);
      delay_ms(2);                      /* 等待至少1.35ms */
      if( retry++ > 100 )
      {
            break;
      }
  }

  /* AutoGain OFF, reclevel 0x1000 */
  while( VS1003_ReadReg(SPI_AICTRL1) != 0x1000 )
  {
      VS1003_WriteReg(SPI_AICTRL1,0x1000);
      delay_ms(2);                      /* 等待至少1.35ms */
      if( retry++ > 100 )
      {
            break;
      }
  }

  /* RECORD,NEWMODE,RESET */
  while( VS1003_ReadReg(SPI_MODE) != 0x1804 )
  {
      VS1003_WriteReg(SPI_MODE,0x1804);
      delay_ms(2);                      /* 等待至少1.35ms */
      if( retry++ > 100 )
      {
            break;
      }
  }

  while( VS1003_ReadReg(SPI_CLOCKF) != 0x9800 )
  {
      VS1003_WriteReg(SPI_CLOCKF,0x9800);
      delay_ms(2);                      /* 等待至少1.35ms */
      if( retry++ > 100 )
      {
            break;
      }
  }
}

#include "sdio_sd.h"

/**
  * @brief  SDIO Static flags, TimeOut, FIFO Address
  */
#define NULL 0
#define SDIO_STATIC_FLAGS             ((uint32_t)0x000005FF)
#define SDIO_CMD0TIMEOUT             ((uint32_t)0x00010000)

/**
  * @brief  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)

/**
  * @brief  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_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_DATATIMEOUT                ((uint32_t)0x000FFFFF)
#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)

/**
  * @brief  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)

/**
  * @brief  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)

/**
  * @}
  */

/** @defgroup STM32_EVAL_SDIO_SD_Private_Macros
  * @{
  */
/**
  * @}
  */

/** @defgroup STM32_EVAL_SDIO_SD_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;
__IO SD_Error TransferError = SD_OK;
__IO uint32_t TransferEnd = 0;
__IO uint32_t NumberOfBytes = 0;
SD_CardInfo SDCardInfo;
SDIO_InitTypeDef SDIO_InitStructure;
SDIO_CmdInitTypeDef SDIO_CmdInitStructure;
SDIO_DataInitTypeDef SDIO_DataInitStructure;
/**
  * @}
  */

/** @defgroup STM32_EVAL_SDIO_SD_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);

/**
  * @}
  */

/** @defgroup STM32_EVAL_SDIO_SD_Private_Functions
  * @{
  */

/**
  * @brief  DeInitializes the SDIO interface.
  * @param  None
  * @retval None
  */
void SD_DeInit(void)
{

}

/**
  * @brief  Initializes the SD Card and put it into StandBy State (Ready for
  *       data transfer).
  * @param  None
  * @retval None
  */
void SD_LowLevel_Init(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;

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

  /*!< Configure SD_CD pin: SD Card detect pin */
  GPIO_InitStructure.GPIO_Pin = SD_DETECT_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
  GPIO_Init(SD_DETECT_GPIO_PORT, &GPIO_InitStructure);

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

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

uint32_t SD_DMAEndOfTransferStatus(void)
{
  return (uint32_t)DMA_GetFlagStatus(DMA2_FLAG_TC4);
}

/**
  * @brief  Configures the DMA2 Channel4 for SDIO Rx request.
  * @param  BufferDST: pointer to the destination buffer
  * @param  BufferSize: buffer size
  * @retval None
  */
void SD_LowLevel_DMA_RxConfig(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);
}

/**
  * @brief  Configures the DMA2 Channel4 for SDIO Tx request.
  * @param  BufferSRC: pointer to the source buffer
  * @param  BufferSize: buffer size
  * @retval None
  */
void SD_LowLevel_DMA_TxConfig(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  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;

  /* SDIO Peripheral Low Level Init */
  SD_LowLevel_Init();

  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 */
  /*!< SDIOCLK = HCLK, SDIO_CK = HCLK/(2 + SDIO_TRANSFER_CLK_DIV) */
  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);

  if (errorstatus == SD_OK)
  {
/*----------------- Read CSD/CID MSD registers ------------------*/
errorstatus = SD_GetCardInfo(&SDCardInfo);
  }

  if (errorstatus == SD_OK)
  {
/*----------------- Select Card --------------------------------*/
errorstatus = SD_SelectDeselect((uint32_t) (SDCardInfo.RCA << 16));
  }

  if (errorstatus == SD_OK)
  {
errorstatus = SD_EnableWideBusOperation(SDIO_BusWide_4b);
  }

  /* Set Device Transfer Mode to DMA */
  if (errorstatus == SD_OK)
  {
errorstatus = SD_SetDeviceMode(SD_DMA_MODE);
  }

  return(errorstatus);
}

/**
  * @brief  Gets the cuurent sd card data transfer status.
  * @param  None
  * @retval SDTransferState: Data Transfer state.
  * This value can be:
  *       - SD_TRANSFER_OK: No data transfer is acting
  *       - SD_TRANSFER_BUSY: Data transfer is acting
  */
SDTransferState SD_GetStatus(void)
{
  SDCardState cardstate =  SD_CARD_TRANSFER;

  cardstate = SD_GetState();

  if (cardstate == SD_CARD_TRANSFER)
  {
return(SD_TRANSFER_OK);
  }
  else if(cardstate == SD_CARD_ERROR)
  {
return (SD_TRANSFER_ERROR);
  }
  else
  {
return(SD_TRANSFER_BUSY);
  }
}

/**
  * @brief  Returns the current card's state.
  * @param  None
  * @retval SDCardState: SD Card Error or SD Card Current State.
  */
SDCardState SD_GetState(void)
{
  uint32_t resp1 = 0;

  if(SD_Detect()== SD_PRESENT)
  {
if (SD_SendStatus(&resp1) != SD_OK)
{
   return SD_CARD_ERROR;
}
else
{
   return (SDCardState)((resp1 >> 9) & 0x0F);
}
  }
  else
  {
return SD_CARD_ERROR;
  }
}

/**
* @brief  Detect if SD card is correctly plugged in the memory slot.
* @param  None
* @retval Return if SD is detected or not
*/
uint8_t SD_Detect(void)
{
  __IO uint8_t status = SD_PRESENT;

  /*!< Check GPIO to detect SD */
  if (GPIO_ReadInputDataBit(SD_DETECT_GPIO_PORT, SD_DETECT_PIN) != Bit_RESET)
  {
status = SD_NOT_PRESENT;
  }
  return status;
}

/**
  * @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, validvoltage = 0;
  uint32_t SDType = SD_STD_CAPACITY;

  /*!< Power ON Sequence -----------------------------------------------------*/
  /*!< Configure the SDIO peripheral */
  /*!< SDIOCLK = HCLK, SDIO_CK = HCLK/(2 + SDIO_INIT_CLK_DIV) */
  /*!< SDIO_CK for initialization should not exceed 400 KHz */
  SDIO_InitStructure.SDIO_ClockDiv = SDIO_INIT_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);

  /*!< 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 = SD_CMD_GO_IDLE_STATE;
  SDIO_CmdInitStructure.SDIO_Response = SDIO_Response_No;
  SDIO_CmdInitStructure.SDIO_Wait = SDIO_Wait_No;
  SDIO_CmdInitStructure.SDIO_CPSM = SDIO_CPSM_Enable;
  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 = SD_CMD_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(SD_CMD_APP_CMD);
  }
  /*!< CMD55 */
  SDIO_CmdInitStructure.SDIO_Argument = 0x00;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_APP_CMD);

   if (errorstatus != SD_OK)
   {
      return(errorstatus);
   }
   SDIO_CmdInitStructure.SDIO_Argument = SD_VOLTAGE_WINDOW_SD | SDType;
   SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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 = (((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 */

  return(errorstatus);
}

/**
  * @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 = SD_CMD_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 = SD_CMD_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(SD_CMD_SET_REL_ADDR, &rca);

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 = SD_CMD_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 = SD_CMD_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(SD_CMD_SEL_DESEL_CARD);

  return(errorstatus);
}

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

  /*!< Send CMD17 READ_SINGLE_BLOCK */
  SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)ReadAddr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_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)
  {
SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_STBITERR, ENABLE);
SDIO_DMACmd(ENABLE);
SD_LowLevel_DMA_RxConfig((uint32_t *)readbuff, BlockSize);
while ((SD_DMAEndOfTransferStatus() == RESET) && (TransferEnd == 0) && (TransferError == SD_OK))
{}
if (TransferError != SD_OK)
{
   return(TransferError);
}
  }
  return(errorstatus);
}

/**
  * @brief  Allows to read blocks from a specified address  in a card.
  * @param  readbuff: pointer to the buffer that will contain the received data.
  * @param  ReadAddr: Address from where data are to be read.
  * @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(uint8_t *readbuff, uint32_t ReadAddr, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
  SD_Error errorstatus = SD_OK;
  uint32_t count = 0, *tempbuff = (uint32_t *)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;
ReadAddr /= 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 = SD_CMD_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(SD_CMD_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 = (uint32_t *)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)ReadAddr;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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)
{
   SDIO_ITConfig(SDIO_IT_DCRCFAIL | SDIO_IT_DTIMEOUT | SDIO_IT_DATAEND | SDIO_IT_RXOVERR | SDIO_IT_STBITERR, ENABLE);
   SDIO_DMACmd(ENABLE);
   SD_LowLevel_DMA_RxConfig((uint32_t *)readbuff, (NumberOfBlocks * BlockSize));
   while ((SD_DMAEndOfTransferStatus() == RESET) && (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  writebuff: pointer to the buffer that contain the data to be transferred.
  * @param  WriteAddr: Address from where data are to be read.
  * @param  BlockSize: the SD card Data block size.
  * @retval SD_Error: SD Card Error code.
  */
SD_Error SD_WriteBlock(uint8_t *writebuff, uint32_t WriteAddr, 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 = (uint32_t *)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;
WriteAddr /= 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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = WriteAddr;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_WRITE_SINGLE_BLOCK);

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

  TotalNumberOfBytes = BlockSize;
  StopCondition = 0;
  SrcBuffer = (uint32_t *)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);
SD_LowLevel_DMA_TxConfig((uint32_t *)writebuff, BlockSize);
SDIO_DMACmd(ENABLE);
while ((SD_DMAEndOfTransferStatus() == RESET) && (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  WriteAddr: 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(uint8_t *writebuff, uint32_t WriteAddr, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
  SD_Error errorstatus = SD_OK;
  uint8_t  power = 0, cardstate = 0;
  uint32_t bytestransferred = 0;
  uint32_t restwords = 0;
  uint32_t *tempbuff = (uint32_t *)writebuff;
  __IO uint32_t count = 0;

  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;
WriteAddr /= 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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_APP_CMD);

   if (errorstatus != SD_OK)
   {
      return(errorstatus);
   }
   /*!< To improve performance */
   SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)NumberOfBlocks;
   SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_SET_BLOCK_COUNT);

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

/*!< Send CMD25 WRITE_MULT_BLOCK with argument data address */
SDIO_CmdInitStructure.SDIO_Argument = (uint32_t)WriteAddr;
SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_WRITE_MULT_BLOCK);

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

TotalNumberOfBytes = NumberOfBlocks * BlockSize;
StopCondition = 1;
SrcBuffer = (uint32_t *)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 = SD_CMD_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(SD_CMD_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);
   SD_LowLevel_DMA_TxConfig((uint32_t *)writebuff, (NumberOfBlocks * BlockSize));
   while ((SD_DMAEndOfTransferStatus() == RESET) && (TransferEnd == 0) && (TransferError == SD_OK))
   {}
   if (TransferError != SD_OK)
   {
      return(TransferError);
   }
}
  }
  /*!< Clear all the static flags */
  SDIO_ClearFlag(SDIO_STATIC_FLAGS);

  /*!< Add some delay before checking the Card Status */
  for(count = 0; count < 0xFFFF; count++)
  {
  }
  /*!< 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_TRANSFER_OK: No data transfer is acting
  *       - SD_TRANSFER_BUSY: Data transfer is acting
  */
SDTransferState SD_GetTransferState(void)
{
  if (SDIO->STA & (SDIO_FLAG_TXACT | SDIO_FLAG_RXACT))
  {
return(SD_TRANSFER_BUSY);
  }
  else
  {
return(SD_TRANSFER_OK);
  }
}

/**
  * @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 = SD_CMD_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(SD_CMD_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 = 120000 / ((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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_SD_ERASE_GRP_END);
if (errorstatus != SD_OK)
{
   return(errorstatus);
}
  }

  /*!< Send CMD38 ERASE */
  SDIO_CmdInitStructure.SDIO_Argument = 0;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_SET_BLOCKLEN);

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

  /*!< CMD55 */
  SDIO_CmdInitStructure.SDIO_Argument = (uint32_t) RCA << 16;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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 != SD_CMD_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 = SD_CMD_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(SD_CMD_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 = SD_CMD_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(SD_CMD_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);

  /*!< Send ACMD51 SD_APP_SEND_SCR with argument as 0 */
  SDIO_CmdInitStructure.SDIO_Argument = 0x0;
  SDIO_CmdInitStructure.SDIO_CmdIndex = SD_CMD_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(SD_CMD_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);
}

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