[求助] 对SD卡的CSD寄存器的一些疑惑求解

我用串口显示SD卡的CSD寄存器中的值，结果是从串口中读出 SD的容量为“”，这是怎么回事啊，请高手指点

要16进显示

回复 沙发 huo_hu 的帖子

我用16进制显示是0E，那请问SD卡的容量是0E是什么意思呢？

回复 板凳 dianziyn 的帖子

自己看吧

  //!< Byte 0 //
  tmp = (u8)((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 = (u8)((CSD_Tab[0] & 0x00FF0000) >> 16);
  cardinfo->SD_csd.TAAC = tmp;

  //!< Byte 2 //
  tmp = (u8)((CSD_Tab[0] & 0x0000FF00) >> 8);
  cardinfo->SD_csd.NSAC = tmp;

  //!< Byte 3 //
  tmp = (u8)(CSD_Tab[0] & 0x000000FF);
  cardinfo->SD_csd.MaxBusClkFrec = tmp;

  //!< Byte 4 //
  tmp = (u8)((CSD_Tab[1] & 0xFF000000) >> 24);
  cardinfo->SD_csd.CardComdClasses = tmp << 4;

  //!< Byte 5 //
  tmp = (u8)((CSD_Tab[1] & 0x00FF0000) >> 16);
  cardinfo->SD_csd.CardComdClasses |= (tmp & 0xF0) >> 4;
  cardinfo->SD_csd.RdBlockLen = tmp & 0x0F;
  
  //!< Byte 6 //
  tmp = (u8)((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 = (u8)(CSD_Tab[1] & 0x000000FF);
    cardinfo->SD_csd.DeviceSize |= (tmp) << 2;

    //!< Byte 8 //
    tmp = (u8)((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 = (u8)((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 = (u8)((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 = (u8)(CSD_Tab[1] & 0x000000FF);
    cardinfo->SD_csd.DeviceSize = (tmp & 0x3F) << 16;

    //!< Byte 8 //
    tmp = (u8)((CSD_Tab[2] & 0xFF000000) >> 24);

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

    //!< Byte 9 //
    tmp = (u8)((CSD_Tab[2] & 0x00FF0000) >> 16);

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

    //!< Byte 10 //
    tmp = (u8)((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 = (u8)(CSD_Tab[2] & 0x000000FF);
  cardinfo->SD_csd.EraseGrMul |= (tmp & 0x80) >> 7;
  cardinfo->SD_csd.WrProtectGrSize = (tmp & 0x7F);

  //!< Byte 12 //
  tmp = (u8)((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 = (u8)((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 = (u8)((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 = (u8)(CSD_Tab[3] & 0x000000FF);
  cardinfo->SD_csd.CSD_CRC = (tmp & 0xFE) >> 1;
  cardinfo->SD_csd.Reserved4 = 1;


  //!< Byte 0 //
  tmp = (u8)((CID_Tab[0] & 0xFF000000) >> 24);
  cardinfo->SD_cid.ManufacturerID = tmp;

  //!< Byte 1 //
  tmp = (u8)((CID_Tab[0] & 0x00FF0000) >> 16);
  cardinfo->SD_cid.OEM_AppliID = tmp << 8;

  //!< Byte 2 //
  tmp = (u8)((CID_Tab[0] & 0x000000FF00) >> 8);
  cardinfo->SD_cid.OEM_AppliID |= tmp;

  //!< Byte 3 //
  tmp = (u8)(CID_Tab[0] & 0x000000FF);
  cardinfo->SD_cid.ProdName1 = tmp << 24;

  //!< Byte 4 //
  tmp = (u8)((CID_Tab[1] & 0xFF000000) >> 24);
  cardinfo->SD_cid.ProdName1 |= tmp << 16;

  //!< Byte 5 //
  tmp = (u8)((CID_Tab[1] & 0x00FF0000) >> 16);
  cardinfo->SD_cid.ProdName1 |= tmp << 8;

  //!< Byte 6 //
  tmp = (u8)((CID_Tab[1] & 0x0000FF00) >> 8);
  cardinfo->SD_cid.ProdName1 |= tmp;

  //!< Byte 7 //
  tmp = (u8)(CID_Tab[1] & 0x000000FF);
  cardinfo->SD_cid.ProdName2 = tmp;

  //!< Byte 8 //
  tmp = (u8)((CID_Tab[2] & 0xFF000000) >> 24);
  cardinfo->SD_cid.ProdRev = tmp;

  //!< Byte 9 //
  tmp = (u8)((CID_Tab[2] & 0x00FF0000) >> 16);
  cardinfo->SD_cid.ProdSN = tmp << 24;

  //!< Byte 10 //
  tmp = (u8)((CID_Tab[2] & 0x0000FF00) >> 8);
  cardinfo->SD_cid.ProdSN |= tmp << 16;

  //!< Byte 11 //
  tmp = (u8)(CID_Tab[2] & 0x000000FF);
  cardinfo->SD_cid.ProdSN |= tmp << 8;

  //!< Byte 12 //
  tmp = (u8)((CID_Tab[3] & 0xFF000000) >> 24);
  cardinfo->SD_cid.ProdSN |= tmp;

  //!< Byte 13 //
  tmp = (u8)((CID_Tab[3] & 0x00FF0000) >> 16);
  cardinfo->SD_cid.Reserved1 |= (tmp & 0xF0) >> 4;
  cardinfo->SD_cid.ManufactDate = (tmp & 0x0F) << 8;

  //!< Byte 14 //
  tmp = (u8)((CID_Tab[3] & 0x0000FF00) >> 8);
  cardinfo->SD_cid.ManufactDate |= tmp;

  //!< Byte 15 //
  tmp = (u8)(CID_Tab[3] & 0x000000FF);
  cardinfo->SD_cid.CID_CRC = (tmp & 0xFE) >> 1;
  cardinfo->SD_cid.Reserved2 = 1;