Beispiel #1
0
/**
  * @brief  Write a buffer (many blocks) in the SD card.
  * @note   The amount of data to write should be a multiple of SD card BLOCK
  *         size (512 Byte).
  * @param  pBuffer : pointer to the buffer containing the data to be written on the SD.
  * @param  WriteAddr : address to write on.
  * @param  NumByteToWrite : number of data to write.
  * @retval SD Response:
  *   - SD_RESPONSE_FAILURE: Sequence failed.
  *   - SD_RESPONSE_NO_ERROR: Sequence succeed.
  */
uint8_t SD_WriteBuffer(uint8_t *pBuffer, uint32_t WriteAddr, uint32_t NumByteToWrite)
{
  uint32_t i = 0, NbrOfBlock = 0, Offset = 0;
  uint8_t rvalue = SD_RESPONSE_FAILURE;

  /* Calculate number of blocks to write */
  NbrOfBlock = NumByteToWrite / SD_BLOCK_SIZE;
  /* SD chip select low */
  SD_CS_LOW();

  /* Data transfer */
  while (NbrOfBlock--)
  {
    /* Send CMD24 (SD_WRITE_BLOCK) to write blocks */
    SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, WriteAddr + Offset, 0xFF);

    /* Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
    if (SD_GetResponse(SD_RESPONSE_NO_ERROR))
    {
      return SD_RESPONSE_FAILURE;
    }
    /* Send dummy byte */
    SD_WriteByte(SD_DUMMY_BYTE);
    /* Send the data token to signify the start of the data */
    SD_WriteByte(SD_START_DATA_SINGLE_BLOCK_WRITE);
    /* Write the block data to SD : write count data by block */
    for (i = 0; i < SD_BLOCK_SIZE; i++)
    {
      /* Send the pointed byte */
      SD_WriteByte(*pBuffer);
      /* Point to the next location where the byte read will be saved */
      pBuffer++;
    }
    /* Set next write address */
    Offset += 512;
    /* Put CRC bytes (not really needed by us, but required by SD) */
    SD_ReadByte();
    SD_ReadByte();
    /* Read data response */
    if (SD_GetDataResponse() == SD_DATA_OK)
    {
      /* Set response value to success */
      rvalue = SD_RESPONSE_NO_ERROR;
    }
    else
    {
      /* Set response value to failure */
      rvalue = SD_RESPONSE_FAILURE;
    }
  }

  /* SD chip select high */
  SD_CS_HIGH();
  /* Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);
  /* Returns the response */
  return rvalue;
}
Beispiel #2
0
/**
  * @brief  Writes a block on the SD
  * @param  pBuffer: pointer to the buffer containing the data to be written on
  *                  the SD.
  * @param  WriteAddr: address to write on.
  * @param  BlockSize: the SD card Data block size.
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_WriteBlock(uint8_t* pBuffer, uint32_t WriteAddr, uint16_t BlockSize)
{
  uint32_t i = 0;
  uint8_t rvalue = SD_RESPONSE_FAILURE;

  /*!< SD chip select low */
  SD_CS_LOW();

  /*!< Send CMD24 (SD_CMD_WRITE_SINGLE_BLOCK) to write multiple block */
  SD_SendCmd(SD_CMD_WRITE_SINGLE_BLOCK, WriteAddr, 0xFF);

  /*!< Check if the SD acknowledged the write block command: R1 response (0x00: no errors) */
  if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
  {
    /*!< Send a dummy byte */
    SD_WriteByte(SD_DUMMY_BYTE);

    /*!< Send the data token to signify the start of the data */
    SD_WriteByte(0xFE);

    /*!< Write the block data to SD : write count data by block */
    for (i = 0; i < BlockSize; i++)
    {
      /*!< Send the pointed byte */
      SD_WriteByte(*pBuffer);
      /*!< Point to the next location where the byte read will be saved */
      pBuffer++;
    }

    /* Send DUMMY bytes when the number of data to be written are lower
       than the SD card BLOCK size (512 Byte) */
    for (; i != SD_BLOCK_SIZE; i++)
    {
      /* Send the pointed byte */
      SD_WriteByte(SD_DUMMY_BYTE);
    }

    /*!< Put CRC bytes (not really needed by us, but required by SD) */
    SD_ReadByte();
    SD_ReadByte();

    /*!< Read data response */
    if (SD_GetDataResponse() == SD_DATA_OK)
    {
      rvalue = SD_RESPONSE_NO_ERROR;
    }
  }
  /*!< SD chip select high */
  SD_CS_HIGH();
  /*!< Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);

  /*!< Returns the response */
  return rvalue;

}
Beispiel #3
0
// Send a command to the SD Card
//  uiCmdIndex : Command index. 0 to 63
//  uiArgument : Command argument
void SD_SendCommand(UINT8 uiCmdIndex, UINT32 uiArgument)
{
    // Send command
    UINT8 uiCmdByte = 64 + (uiCmdIndex & 63);
    SD_WriteByte(uiCmdByte);
    
    // Send argument
    int i;
    for (i = 0; i < 4; i++)
    {
        SD_WriteByte((uiArgument >> 24) & 0xff);
        uiArgument = uiArgument << 8;
    }
    
    SD_WriteByte(0x95); // Hard coded CRC
} 
/**
  * @brief  Reads multiple block of data from the SD.
  * @param  pBuffer: pointer to the buffer that receives the data read from the 
  *                  SD.
  * @param  ReadAddr: SD's internal address to read from.
  * @param  BlockSize: the SD card Data block size.
  * @param  NumberOfBlocks: number of blocks to be read.
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_ReadMultiBlocks(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t BlockSize, uint32_t NumberOfBlocks)
{
  uint32_t i = 0, Offset = 0;
  SD_Error rvalue = SD_RESPONSE_FAILURE;
  
  /*!< SD chip select low */
  SD_CS_LOW();
  /*!< Data transfer */
  while (NumberOfBlocks--)
  {
    if(flag_SDHC == 1)
    {
        /*!< Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
        SD_SendCmd (SD_CMD_READ_SINGLE_BLOCK,(ReadAddr + Offset)/512, 0xFF);
    }
    else
    {
        /*!< Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
        SD_SendCmd (SD_CMD_READ_SINGLE_BLOCK, ReadAddr + Offset, 0xFF);
    }
    /*!< Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
    if (SD_GetResponse(SD_RESPONSE_NO_ERROR))
    {
      return  SD_RESPONSE_FAILURE;
    }
    /*!< Now look for the data token to signify the start of the data */
    if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
    {
      /*!< Read the SD block data : read NumByteToRead data */
      for (i = 0; i < BlockSize; i++)
      {
        /*!< Read the pointed data */
        *pBuffer = SD_ReadByte();
        /*!< Point to the next location where the byte read will be saved */
        pBuffer++;
      }
      /*!< Set next read address*/
      Offset += 512;
      /*!< get CRC bytes (not really needed by us, but required by SD) */
      SD_ReadByte();
      SD_ReadByte();
      /*!< Set response value to success */
      rvalue = SD_RESPONSE_NO_ERROR;
    }
    else
    {
      /*!< Set response value to failure */
      rvalue = SD_RESPONSE_FAILURE;
    }
  }
  /*!< SD chip select high */
  SD_CS_HIGH();
  /*!< Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);
  /*!< Returns the reponse */
  return rvalue;
}
/**
  * @brief  Put SD in Idle state.
  * @param  None
  * @retval The SD Response: 
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_GoIdleState(void)
{
  /*!< SD chip select low */
  SD_CS_LOW();
  
  /*!< Send CMD0 (SD_CMD_GO_IDLE_STATE) to put SD in SPI mode */
  SD_SendCmd(SD_CMD_GO_IDLE_STATE, 0, 0x95);
  
  /*!< Wait for In Idle State Response (R1 Format) equal to 0x01 */
  if (SD_GetResponse(SD_IN_IDLE_STATE))
  {
    /*!< No Idle State Response: return response failue */
    return SD_RESPONSE_FAILURE;
  }
  /*----------Activates the card initialization process-----------*/
  do
  {
    /*!< SD chip select high */
    SD_CS_HIGH();
    
    /*!< Send Dummy byte 0xFF */
    SD_WriteByte(SD_DUMMY_BYTE);
    
    /*!< SD chip select low */
    SD_CS_LOW();
    
    /*!< Send CMD1 (Activates the card process) until response equal to 0x0 */
    SD_SendCmd(SD_CMD_SEND_OP_COND, 0, 0xFF);
    /*!< Wait for no error Response (R1 Format) equal to 0x00 */
  }
  while (SD_GetResponse(SD_RESPONSE_NO_ERROR));
  
  /*!< SD chip select high */
  SD_CS_HIGH();
  
  /*!< Send dummy byte 0xFF */
  SD_WriteByte(SD_DUMMY_BYTE);
  
  return SD_RESPONSE_NO_ERROR;
}
Beispiel #6
0
/**
  * @brief  Reads a block of data from the SD.
  * @param  pBuffer: pointer to the buffer that receives the data read from the
  *                  SD.
  * @param  ReadAddr: SD's internal address to read from.
  * @param  BlockSize: the SD card Data block size.
  * @retval The SD Response:
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
uint8_t SD_ReadBlock(uint8_t* pBuffer, uint32_t ReadAddr, uint16_t BlockSize)
{
  uint32_t i = 0;
  uint8_t rvalue = SD_RESPONSE_FAILURE;

  /*!< SD chip select low */
  SD_CS_LOW();

  /*!< Send CMD17 (SD_CMD_READ_SINGLE_BLOCK) to read one block */
  SD_SendCmd(SD_CMD_READ_SINGLE_BLOCK, ReadAddr, 0xFF);

  /*!< Check if the SD acknowledged the read block command: R1 response (0x00: no errors) */
  if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
  {
    /*!< Now look for the data token to signify the start of the data */
    if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
    {
      /*!< Read the SD block data : read NumByteToRead data */
      for (i = 0; i < BlockSize; i++)
      {
        /*!< Save the received data */
        *pBuffer = SD_ReadByte();

        /*!< Point to the next location where the byte read will be saved */
        pBuffer++;
      }
      /*!< Get CRC bytes (not really needed by us, but required by SD) */
      SD_ReadByte();
      SD_ReadByte();
      /*!< Set response value to success */
      rvalue = SD_RESPONSE_NO_ERROR;
    }
  }
  /*!< SD chip select high */
  SD_CS_HIGH();

  /*!< Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);

  /*!< Returns the response */
  return rvalue;

}
/**
  * @brief  Returns the SD status.
  * @param  None
  * @retval The SD status.
  */
uint16_t SD_GetStatus(void)
{
  uint16_t Status = 0;

  /*!< SD chip select low */
  SD_CS_LOW();

  /*!< Send CMD13 (SD_SEND_STATUS) to get SD status */
  SD_SendCmd(SD_CMD_SEND_STATUS, 0, 0xFF);

  Status = SD_ReadByte();
  Status |= (uint16_t)(SD_ReadByte() << 8);

  /*!< SD chip select high */
  SD_CS_HIGH();

  /*!< Send dummy byte 0xFF */
  SD_WriteByte(SD_DUMMY_BYTE);

  return Status;
}
/**
  * @brief  Initializes the SD/SD communication.
  * @param  None
  * @retval The SD Response: 
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_Init(void)
{
  uint32_t i = 0;

  /*!< Initialize SD_SPI */
  SD_LowLevel_Init(); 

  /*!< SD chip select high */
  SD_CS_HIGH();

  /*!< Send dummy byte 0xFF, 10 times with CS high */
  /*!< Rise CS and MOSI for 80 clocks cycles */
  for (i = 0; i <= 9; i++)
  {
    /*!< Send dummy byte 0xFF */
    SD_WriteByte(SD_DUMMY_BYTE);
  }
  /*------------Put SD in SPI mode--------------*/
  /*!< SD initialized and set to SPI mode properly */
  return (SD_GoIdleState());
}
/**
  * @brief  Initializes the SD/SD communication.
  * @param  None
  * @retval The SD Response: 
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_Init(void)
{
  uint32_t TimeOut, i = 0;
  SD_Error Status = SD_RESPONSE_NO_ERROR;

  /*!< Initialize SD_SPI 初始化SPI相应管脚与处理器的SPI接口 */
  //printf("(SD Init in SPI mode)");
  SD_LowLevel_Init(); 
  SD_SPI_SetSpeedLow();
  //rt_kprintf("sd_init 0\n");
  /*------------Put SD in SPI mode--------------*/
  /*!< SD initialized and set to SPI mode properly */
  TimeOut = 0;
  do
  {
    /*!< SD chip select high */
    SD_CS_HIGH();
  
    /*!< Send dummy byte 0xFF, 10 times with CS high */
    /*!< Rise CS and MOSI for 80 clocks cycles */
    for (i = 0; i <= 9; i++)
    {
      /*!< Send dummy byte 0xFF */
      SD_WriteByte(SD_DUMMY_BYTE);
    }    
    
	Status = SD_GoIdleState();
	//rt_kprintf("sd_init 1 %d\n",(uint32_t)Status);
    if(TimeOut > 6)
    {
      break;
    }
    TimeOut++;
  }while(Status);

  SD_SPI_SetSpeedHi();
  
  return (Status);
}
/**
  * @brief  Send 5 bytes command to the SD card.
  * @param  Cmd: The user expected command to send to SD card.
  * @param  Arg: The command argument.
  * @param  Crc: The CRC.
  * @retval None
  */
void SD_SendCmd(uint8_t Cmd, uint32_t Arg, uint8_t Crc)
{
  uint32_t i = 0x00;
  
  uint8_t Frame[6];
  
  Frame[0] = (Cmd | 0x40); /*!< Construct byte 1 */
  
  Frame[1] = (uint8_t)(Arg >> 24); /*!< Construct byte 2 */
  
  Frame[2] = (uint8_t)(Arg >> 16); /*!< Construct byte 3 */
  
  Frame[3] = (uint8_t)(Arg >> 8); /*!< Construct byte 4 */
  
  Frame[4] = (uint8_t)(Arg); /*!< Construct byte 5 */
  
  Frame[5] = (Crc); /*!< Construct CRC: byte 6 */
  
  for (i = 0; i < 6; i++)
  {
    SD_WriteByte(Frame[i]); /*!< Send the Cmd bytes */
  }
}
/**
  * @brief  Read the CID card register.
  *         Reading the contents of the CID register in SPI mode is a simple 
  *         read-block transaction.
  * @param  SD_cid: pointer on an CID register structure
  * @retval The SD Response: 
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_GetCIDRegister(SD_CID* SD_cid)
{
  uint32_t i = 0;
  SD_Error rvalue = SD_RESPONSE_FAILURE;
  uint8_t CID_Tab[16];
  
  /*!< SD chip select low */
  SD_CS_LOW();
  
  /*!< Send CMD10 (CID register) */
  SD_SendCmd(SD_CMD_SEND_CID, 0, 0xFF);
  
  /*!< Wait for response in the R1 format (0x00 is no errors) */
  if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
  {
    if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
    {
      /*!< Store CID register value on CID_Tab */
      for (i = 0; i < 16; i++)
      {
        CID_Tab[i] = SD_ReadByte();
      }
    }
    /*!< Get CRC bytes (not really needed by us, but required by SD) */
    SD_WriteByte(SD_DUMMY_BYTE);
    SD_WriteByte(SD_DUMMY_BYTE);
    /*!< Set response value to success */
    rvalue = SD_RESPONSE_NO_ERROR;
  }
  /*!< SD chip select high */
  SD_CS_HIGH();
  /*!< Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);

  /*!< Byte 0 */
  SD_cid->ManufacturerID = CID_Tab[0];

  /*!< Byte 1 */
  SD_cid->OEM_AppliID = CID_Tab[1] << 8;

  /*!< Byte 2 */
  SD_cid->OEM_AppliID |= CID_Tab[2];

  /*!< Byte 3 */
  SD_cid->ProdName1 = CID_Tab[3] << 24;

  /*!< Byte 4 */
  SD_cid->ProdName1 |= CID_Tab[4] << 16;

  /*!< Byte 5 */
  SD_cid->ProdName1 |= CID_Tab[5] << 8;

  /*!< Byte 6 */
  SD_cid->ProdName1 |= CID_Tab[6];

  /*!< Byte 7 */
  SD_cid->ProdName2 = CID_Tab[7];

  /*!< Byte 8 */
  SD_cid->ProdRev = CID_Tab[8];

  /*!< Byte 9 */
  SD_cid->ProdSN = CID_Tab[9] << 24;

  /*!< Byte 10 */
  SD_cid->ProdSN |= CID_Tab[10] << 16;

  /*!< Byte 11 */
  SD_cid->ProdSN |= CID_Tab[11] << 8;

  /*!< Byte 12 */
  SD_cid->ProdSN |= CID_Tab[12];

  /*!< Byte 13 */
  SD_cid->Reserved1 |= (CID_Tab[13] & 0xF0) >> 4;
  SD_cid->ManufactDate = (CID_Tab[13] & 0x0F) << 8;

  /*!< Byte 14 */
  SD_cid->ManufactDate |= CID_Tab[14];

  /*!< Byte 15 */
  SD_cid->CID_CRC = (CID_Tab[15] & 0xFE) >> 1;
  SD_cid->Reserved2 = 1;

  /*!< Return the reponse */
  return rvalue;
}
/**
  * @brief  Read the CSD card register.
  *         Reading the contents of the CSD register in SPI mode is a simple 
  *         read-block transaction.
  * @param  SD_csd: pointer on an SCD register structure
  * @retval The SD Response: 
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_GetCSDRegister(SD_CSD* SD_csd)
{
  uint32_t i = 0;
  SD_Error rvalue = SD_RESPONSE_FAILURE;
  uint8_t CSD_Tab[16];

  /*!< SD chip select low */
  SD_CS_LOW();
  /*!< Send CMD9 (CSD register) or CMD10(CSD register) */
  SD_SendCmd(SD_CMD_SEND_CSD, 0, 0xFF);
  /*!< Wait for response in the R1 format (0x00 is no errors) */
  if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
  {
    if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
    {
      for (i = 0; i < 16; i++)
      {
        /*!< Store CSD register value on CSD_Tab */
        CSD_Tab[i] = SD_ReadByte();
      }
    }
    /*!< Get CRC bytes (not really needed by us, but required by SD) */
    SD_WriteByte(SD_DUMMY_BYTE);
    SD_WriteByte(SD_DUMMY_BYTE);
    /*!< Set response value to success */
    rvalue = SD_RESPONSE_NO_ERROR;
  }
  /*!< SD chip select high */
  SD_CS_HIGH();
  /*!< Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);

  /*!< Byte 0 */
  SD_csd->CSDStruct = (CSD_Tab[0] & 0xC0) >> 6;
  SD_csd->SysSpecVersion = (CSD_Tab[0] & 0x3C) >> 2;
  SD_csd->Reserved1 = CSD_Tab[0] & 0x03;

  /*!< Byte 1 */
  SD_csd->TAAC = CSD_Tab[1];

  /*!< Byte 2 */
  SD_csd->NSAC = CSD_Tab[2];

  /*!< Byte 3 */
  SD_csd->MaxBusClkFrec = CSD_Tab[3];

  /*!< Byte 4 */
  SD_csd->CardComdClasses = CSD_Tab[4] << 4;

  /*!< Byte 5 */
  SD_csd->CardComdClasses |= (CSD_Tab[5] & 0xF0) >> 4;
  SD_csd->RdBlockLen = CSD_Tab[5] & 0x0F;

  /*!< Byte 6 */
  SD_csd->PartBlockRead = (CSD_Tab[6] & 0x80) >> 7;
  SD_csd->WrBlockMisalign = (CSD_Tab[6] & 0x40) >> 6;
  SD_csd->RdBlockMisalign = (CSD_Tab[6] & 0x20) >> 5;
  SD_csd->DSRImpl = (CSD_Tab[6] & 0x10) >> 4;
  SD_csd->Reserved2 = 0; /*!< Reserved */

  SD_csd->DeviceSize = (CSD_Tab[6] & 0x03) << 10;

  /*!< Byte 7 */
  SD_csd->DeviceSize |= (CSD_Tab[7]) << 2;

  /*!< Byte 8 */
  SD_csd->DeviceSize |= (CSD_Tab[8] & 0xC0) >> 6;

  SD_csd->MaxRdCurrentVDDMin = (CSD_Tab[8] & 0x38) >> 3;
  SD_csd->MaxRdCurrentVDDMax = (CSD_Tab[8] & 0x07);

  /*!< Byte 9 */
  SD_csd->MaxWrCurrentVDDMin = (CSD_Tab[9] & 0xE0) >> 5;
  SD_csd->MaxWrCurrentVDDMax = (CSD_Tab[9] & 0x1C) >> 2;
  SD_csd->DeviceSizeMul = (CSD_Tab[9] & 0x03) << 1;
  /*!< Byte 10 */
  SD_csd->DeviceSizeMul |= (CSD_Tab[10] & 0x80) >> 7;
    
  SD_csd->EraseGrSize = (CSD_Tab[10] & 0x40) >> 6;
  SD_csd->EraseGrMul = (CSD_Tab[10] & 0x3F) << 1;

  /*!< Byte 11 */
  SD_csd->EraseGrMul |= (CSD_Tab[11] & 0x80) >> 7;
  SD_csd->WrProtectGrSize = (CSD_Tab[11] & 0x7F);

  /*!< Byte 12 */
  SD_csd->WrProtectGrEnable = (CSD_Tab[12] & 0x80) >> 7;
  SD_csd->ManDeflECC = (CSD_Tab[12] & 0x60) >> 5;
  SD_csd->WrSpeedFact = (CSD_Tab[12] & 0x1C) >> 2;
  SD_csd->MaxWrBlockLen = (CSD_Tab[12] & 0x03) << 2;

  /*!< Byte 13 */
  SD_csd->MaxWrBlockLen |= (CSD_Tab[13] & 0xC0) >> 6;
  SD_csd->WriteBlockPaPartial = (CSD_Tab[13] & 0x20) >> 5;
  SD_csd->Reserved3 = 0;
  SD_csd->ContentProtectAppli = (CSD_Tab[13] & 0x01);

  /*!< Byte 14 */
  SD_csd->FileFormatGrouop = (CSD_Tab[14] & 0x80) >> 7;
  SD_csd->CopyFlag = (CSD_Tab[14] & 0x40) >> 6;
  SD_csd->PermWrProtect = (CSD_Tab[14] & 0x20) >> 5;
  SD_csd->TempWrProtect = (CSD_Tab[14] & 0x10) >> 4;
  SD_csd->FileFormat = (CSD_Tab[14] & 0x0C) >> 2;
  SD_csd->ECC = (CSD_Tab[14] & 0x03);

  /*!< Byte 15 */
  SD_csd->CSD_CRC = (CSD_Tab[15] & 0xFE) >> 1;
  SD_csd->Reserved4 = 1;

  /*!< Return the reponse */
  return rvalue;
}
/**
  * @brief  Read the CSD card register.
  *         Reading the contents of the CSD register in SPI mode is a simple 
  *         read-block transaction.
  * @param  SD_csd: pointer on an SCD register structure
  * @retval The SD Response: 
  *         - SD_RESPONSE_FAILURE: Sequence failed
  *         - SD_RESPONSE_NO_ERROR: Sequence succeed
  */
SD_Error SD_GetCSDRegister(SD_CSD* SD_csd)
{
  uint32_t i = 0;
  SD_Error rvalue = SD_RESPONSE_FAILURE;
  uint8_t CSD_Tab[16];
  uint32_t CardCapacity;
  static uint32_t times = 0;

  /*!< SD chip select low */
  SD_CS_LOW();
  /*!< Send CMD9 (CSD register) or CMD10(CSD register) */
  SD_SendCmd(SD_CMD_SEND_CSD, 0, 0xFF);
  /*!< Wait for response in the R1 format (0x00 is no errors) */
  if (!SD_GetResponse(SD_RESPONSE_NO_ERROR))
  {
    if (!SD_GetResponse(SD_START_DATA_SINGLE_BLOCK_READ))
    {
      for (i = 0; i < 16; i++)
      {
        /*!< Store CSD register value on CSD_Tab */
        CSD_Tab[i] = SD_ReadByte();
        //if(0 == times)
        //{
        //  printf("\n\r CSD_Tab[%d] 0x%X", i, CSD_Tab[i]);
        //}
      }
    }
    /*!< Get CRC bytes (not really needed by us, but required by SD) */
    SD_WriteByte(SD_DUMMY_BYTE);
    SD_WriteByte(SD_DUMMY_BYTE);
    /*!< Set response value to success */
    rvalue = SD_RESPONSE_NO_ERROR;
  }
  else
  {
     return rvalue;
  }
  /*!< SD chip select high */
  SD_CS_HIGH();
  /*!< Send dummy byte: 8 Clock pulses of delay */
  SD_WriteByte(SD_DUMMY_BYTE);

  /*!< Byte 0 */
  SD_csd->CSDStruct = (CSD_Tab[0] & 0xC0) >> 6;
  SD_csd->SysSpecVersion = (CSD_Tab[0] & 0x3C) >> 2;
  SD_csd->Reserved1 = CSD_Tab[0] & 0x03;

  if(0 == times)
  {
    if(SD_csd->CSDStruct == 1)
    {
      //printf("\n\r SDHC CSD Version 2.0 Acess AS SD High Capacity.");
      flag_SDHC = 1;
    }
	else
	{
      //printf("\n\r SDSC CSD Version 1.0 Acess AS SD Standard Capacity.");	
      flag_SDHC = 0;
	}
  }

  /*!< Byte 1 */
  SD_csd->TAAC = CSD_Tab[1];

  /*!< Byte 2 */
  SD_csd->NSAC = CSD_Tab[2];

  /*!< Byte 3 */
  SD_csd->MaxBusClkFrec = CSD_Tab[3];

  /*!< Byte 4 */
  SD_csd->CardComdClasses = CSD_Tab[4] << 4;

  /*!< Byte 5 */
  SD_csd->CardComdClasses |= (CSD_Tab[5] & 0xF0) >> 4;
  SD_csd->RdBlockLen = CSD_Tab[5] & 0x0F;

  /*!< Byte 6 */
  SD_csd->PartBlockRead = (CSD_Tab[6] & 0x80) >> 7;
  SD_csd->WrBlockMisalign = (CSD_Tab[6] & 0x40) >> 6;
  SD_csd->RdBlockMisalign = (CSD_Tab[6] & 0x20) >> 5;
  SD_csd->DSRImpl = (CSD_Tab[6] & 0x10) >> 4;
  SD_csd->Reserved2 = 0; /*!< Reserved */

  if(flag_SDHC == 0)
  {
    SD_csd->DeviceSize = (CSD_Tab[6] & 0x03) << 10;
  
    /*!< Byte 7 */
    SD_csd->DeviceSize |= (CSD_Tab[7]) << 2;
  
    /*!< Byte 8 */
    SD_csd->DeviceSize |= (CSD_Tab[8] & 0xC0) >> 6;
  }