msd.c

《基于MDK的STM32处理器应用开发》例程,本例程包使用STM32 FirmLibrary V1.0

  MSD_csd->WriteBlockPaPartial = (CSD_Tab[13] & 0x20) >> 5;
  MSD_csd->Reserved3 = 0;
  MSD_csd->ContentProtectAppli = (CSD_Tab[13] & 0x01);
  /* Byte 14 */
  MSD_csd->FileFormatGrouop = (CSD_Tab[14] & 0x80) >> 7;
  MSD_csd->CopyFlag = (CSD_Tab[14] & 0x40) >> 6;
  MSD_csd->PermWrProtect = (CSD_Tab[14] & 0x20) >> 5;
  MSD_csd->TempWrProtect = (CSD_Tab[14] & 0x10) >> 4;
  MSD_csd->FileFormat = (CSD_Tab[14] & 0x0C) >> 2;
  MSD_csd->ECC = (CSD_Tab[14] & 0x03);
  /* Byte 15 */
  MSD_csd->CRC = (CSD_Tab[15] & 0xFE) >> 1;
  MSD_csd->Reserved4 = 1;

  /* Return the reponse */
  return rvalue;
}

/*******************************************************************************
* Function Name  : MSD_GetCIDRegister
* Description    : Read the CID card register.
*                  Reading the contents of the CID register in SPI mode
*                  is a simple read-block transaction.
* Input          : - MSD_cid: pointer on an CID register structure
* Output         : None
* Return         : The MSD Response: - MSD_RESPONSE_FAILURE: Sequence failed
*                                    - MSD_RESPONSE_NO_ERROR: Sequence succeed 
*******************************************************************************/
u8 MSD_GetCIDRegister(sMSD_CID* MSD_cid)
{
  u32 i = 0;
  u8 rvalue = MSD_RESPONSE_FAILURE;
  u8 CID_Tab[16];

  /* MSD chip select low */
  MSD_CS_LOW();
  /* Send CMD10 (CID register) */
  MSD_SendCmd(MSD_SEND_CID, 0, 0xFF);

  /* Wait for response in the R1 format (0x00 is no errors) */
  if (!MSD_GetResponse(MSD_RESPONSE_NO_ERROR))
  {
    if (!MSD_GetResponse(MSD_START_DATA_SINGLE_BLOCK_READ))
    {
      /* Store CID register value on CID_Tab */
      for (i = 0; i < 16; i++)
      {
        CID_Tab[i] = MSD_ReadByte();
      }
    }
    /* Get CRC bytes (not really needed by us, but required by MSD) */
    MSD_WriteByte(DUMMY);
    MSD_WriteByte(DUMMY);
    /* Set response value to success */
    rvalue = MSD_RESPONSE_NO_ERROR;
  }

  /* MSD chip select high */
  MSD_CS_HIGH();
  /* Send dummy byte: 8 Clock pulses of delay */
  MSD_WriteByte(DUMMY);

  /* Byte 0 */
  MSD_cid->ManufacturerID = CID_Tab[0];
  /* Byte 1 */
  MSD_cid->OEM_AppliID = CID_Tab[1] << 8;
  /* Byte 2 */
  MSD_cid->OEM_AppliID |= CID_Tab[2];
  /* Byte 3 */
  MSD_cid->ProdName1 = CID_Tab[3] << 24;
  /* Byte 4 */
  MSD_cid->ProdName1 |= CID_Tab[4] << 16;
  /* Byte 5 */
  MSD_cid->ProdName1 |= CID_Tab[5] << 8;
  /* Byte 6 */
  MSD_cid->ProdName1 |= CID_Tab[6];
  /* Byte 7 */
  MSD_cid->ProdName2 = CID_Tab[7];
  /* Byte 8 */
  MSD_cid->ProdRev = CID_Tab[8];
  /* Byte 9 */
  MSD_cid->ProdSN = CID_Tab[9] << 24;
  /* Byte 10 */
  MSD_cid->ProdSN |= CID_Tab[10] << 16;
  /* Byte 11 */
  MSD_cid->ProdSN |= CID_Tab[11] << 8;
  /* Byte 12 */
  MSD_cid->ProdSN |= CID_Tab[12];
  /* Byte 13 */
  MSD_cid->Reserved1 |= (CID_Tab[13] & 0xF0) >> 4;
  /* Byte 14 */
  MSD_cid->ManufactDate = (CID_Tab[13] & 0x0F) << 8;
  /* Byte 15 */
  MSD_cid->ManufactDate |= CID_Tab[14];
  /* Byte 16 */
  MSD_cid->CRC = (CID_Tab[15] & 0xFE) >> 1;
  MSD_cid->Reserved2 = 1;

  /* Return the reponse */
  return rvalue;
}

/*******************************************************************************
* Function Name  : MSD_SendCmd
* Description    : Send 5 bytes command to the MSD card.
* Input          : - Cmd: the user expected command to send to MSD card
*                  - Arg: the command argument
*                  - Crc: the CRC
* Output         : None
* Return         : None
*******************************************************************************/
void MSD_SendCmd(u8 Cmd, u32 Arg, u8 Crc)
{
  u32 i = 0x00;
  u8 Frame[6];

  /* Construct byte1 */
  Frame[0] = (Cmd | 0x40);
  /* Construct byte2 */
  Frame[1] = (u8)(Arg >> 24);
  /* Construct byte3 */
  Frame[2] = (u8)(Arg >> 16);
  /* Construct byte4 */
  Frame[3] = (u8)(Arg >> 8);
  /* Construct byte5 */
  Frame[4] = (u8)(Arg);
  /* Construct CRC: byte6 */
  Frame[5] = (Crc);

  /* Send the Cmd bytes */
  for (i = 0; i < 6; i++)
  {
    MSD_WriteByte(Frame[i]);
  }
}

/*******************************************************************************
* Function Name  : MSD_GetDataResponse
* Description    : Get MSD card data response.
* Input          : None
* Output         : None
* Return         : The MSD status: Read data response xxx0<status>1
*                   - status 010: Data accecpted
*                   - status 101: Data rejected due to a crc error
*                   - status 110: Data rejected due to a Write error.
*                   - status 111: Data rejected due to other error.
*******************************************************************************/
u8 MSD_GetDataResponse(void)
{
  u32 i = 0;
  u8 response, rvalue;

  while (i <= 64)
  {
    /* Read resonse */
    response = MSD_ReadByte();
    /* Mask unused bits */
    response &= 0x1F;

    switch (response)
    {
      case MSD_DATA_OK:
      {
        rvalue = MSD_DATA_OK;
        break;
      }

      case MSD_DATA_CRC_ERROR:
        return MSD_DATA_CRC_ERROR;

      case MSD_DATA_WRITE_ERROR:
        return MSD_DATA_WRITE_ERROR;

      default:
      {
        rvalue = MSD_DATA_OTHER_ERROR;
        break;
      }
    }
    /* Exit loop in case of data ok */
    if (rvalue == MSD_DATA_OK)
      break;
    /* Increment loop counter */
    i++;
  }
  /* Wait null data */
  while (MSD_ReadByte() == 0);
  /* Return response */
  return response;
}

/*******************************************************************************
* Function Name  : MSD_GetResponse
* Description    : Returns the MSD response.
* Input          : None
* Output         : None
* Return         : The MSD Response: - MSD_RESPONSE_FAILURE: Sequence failed
*                                    - MSD_RESPONSE_NO_ERROR: Sequence succeed 
*******************************************************************************/
u8 MSD_GetResponse(u8 Response)
{
  u32 Count = 0xFFF;

  /* Check if response is got or a timeout is happen */
  while ((MSD_ReadByte() != Response) && Count)
  {
    Count--;
  }

  if (Count == 0)
  {
    /* After time out */
    return MSD_RESPONSE_FAILURE;
  }
  else
  {
    /* Right response got */
    return MSD_RESPONSE_NO_ERROR;
  }
}

/*******************************************************************************
* Function Name  : MSD_GetStatus
* Description    : Returns the MSD status.
* Input          : None
* Output         : None
* Return         : The MSD status.
*******************************************************************************/
u16 MSD_GetStatus(void)
{
  u16 Status = 0;

  /* MSD chip select low */
  MSD_CS_LOW();
  /* Send CMD13 (MSD_SEND_STATUS) to get MSD status */
  MSD_SendCmd(MSD_SEND_STATUS, 0, 0xFF);

  Status = MSD_ReadByte();
  Status |= (u16)(MSD_ReadByte() << 8);

  /* MSD chip select high */
  MSD_CS_HIGH();
  /* Send dummy byte 0xFF */
  MSD_WriteByte(DUMMY);

  return Status;
}

/*******************************************************************************
* Function Name  : MSD_GoIdleState
* Description    : Put MSD in Idle state.
* Input          : None
* Output         : None
* Return         : The MSD Response: - MSD_RESPONSE_FAILURE: Sequence failed
*                                    - MSD_RESPONSE_NO_ERROR: Sequence succeed 
*******************************************************************************/
u8 MSD_GoIdleState(void)
{
  /* MSD chip select low */
  MSD_CS_LOW();
  /* Send CMD0 (GO_IDLE_STATE) to put MSD in SPI mode */
  MSD_SendCmd(MSD_GO_IDLE_STATE, 0, 0x95);

  /* Wait for In Idle State Response (R1 Format) equal to 0x01 */
  if (MSD_GetResponse(MSD_IN_IDLE_STATE))
  {
    /* No Idle State Response: return response failue */
    return MSD_RESPONSE_FAILURE;
  }
  /*----------Activates the card initialization process-----------*/
  do
  {
    /* MSD chip select high */
    MSD_CS_HIGH();
    /* Send Dummy byte 0xFF */
    MSD_WriteByte(DUMMY);

    /* MSD chip select low */
    MSD_CS_LOW();

    /* Send CMD1 (Activates the card process) until response equal to 0x0 */
    MSD_SendCmd(MSD_SEND_OP_COND, 0, 0xFF);
    /* Wait for no error Response (R1 Format) equal to 0x00 */
  }
  while (MSD_GetResponse(MSD_RESPONSE_NO_ERROR));

  /* MSD chip select high */
  MSD_CS_HIGH();
  /* Send dummy byte 0xFF */
  MSD_WriteByte(DUMMY);

  return MSD_RESPONSE_NO_ERROR;
}

/*******************************************************************************
* Function Name  : MSD_WriteByte
* Description    : Write a byte on the MSD.
* Input          : Data: byte to send.
* Output         : None
* Return         : None.
*******************************************************************************/
void MSD_WriteByte(u8 Data)
{
  /* Wait until the transmit buffer is empty */
  while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
  /* Send the byte */
  SPI_SendData(SPI1, Data);
}

/*******************************************************************************
* Function Name  : MSD_ReadByte
* Description    : Read a byte from the MSD.
* Input          : None.
* Output         : None
* Return         : The received byte.
*******************************************************************************/
u8 MSD_ReadByte(void)
{
  u8 Data = 0;

  /* Wait until the transmit buffer is empty */
  while (SPI_GetFlagStatus(SPI1, SPI_FLAG_TXE) == RESET);
  /* Send the byte */
  SPI_SendData(SPI1, DUMMY);

  /* Wait until a data is received */
  while (SPI_GetFlagStatus(SPI1, SPI_FLAG_RXNE) == RESET);
  /* Get the received data */
  Data = SPI_ReceiveData(SPI1);

  /* Return the shifted data */
  return Data;
}

/*******************************************************************************
* Function Name  : SPI_Config
* Description    : Initializes the SPI1 and CS pins.
* Input          : None
* Output         : None
* Return         : None
*******************************************************************************/
void SPI_Config(void)
{
  GPIO_InitTypeDef  GPIO_InitStructure;
  SPI_InitTypeDef   SPI_InitStructure;

  /* GPIOA and GPIOC Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOE, ENABLE);
  /* SPI1 Periph clock enable */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  /* Configure SPI1 pins: SCK, MISO and MOSI */
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
  GPIO_Init(GPIOE, &GPIO_InitStructure);

  /* SPI1 Config */
  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_32;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

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

/*******************************************************************************
* Function Name  : Get_Medium_Characteristics.
* Description    : Get the microSD card size.
* Input          : None.
* Output         : None.
* Return         : None.
*******************************************************************************/
void Get_Medium_Characteristics(void)
{
  u32 temp1 = 0;
  u32 temp2 = 0;

  MSD_GetCSDRegister(&MSD_csd);

  temp1 = MSD_csd.DeviceSize + 1;
  temp2 = 1 << (MSD_csd.DeviceSizeMul + 2);

  Mass_Block_Count = temp1 * temp2;

  Mass_Block_Size =  1 << MSD_csd.RdBlockLen;

  Mass_Memory_Size = (Mass_Block_Count * Mass_Block_Size);

}

/******************* (C) COPYRIGHT 2007 STMicroelectronics *****END OF FILE****/