下面是USB库的SCSI的其中一个功能函数: 
 
void SCSI_ReadCapacity10_Cmd(u8 lun)
{
  if (MAL_GetStatus(lun))
  {
    Set_Scsi_Sense_Data(CBW.bLUN, NOT_READY, MEDIUM_NOT_PRESENT);
    Set_CSW (CSW_CMD_FAILED, SEND_CSW_ENABLE); -------------------------(1)
    Bot_Abort(DIR_IN); --------------------------------------------------------------(2)
    return;
  }
  ReadCapacity10_Data[0] = (u8)(Mass_Block_Count[lun] - 1 >> 24);
  ReadCapacity10_Data[1] = (u8)(Mass_Block_Count[lun] - 1 >> 16);
  ReadCapacity10_Data[2] = (u8)(Mass_Block_Count[lun] - 1 >>  8);
  ReadCapacity10_Data[3] = (u8)(Mass_Block_Count[lun] - 1);
  ReadCapacity10_Data[4] = (u8)(Mass_Block_Size[lun] >>  24);
  ReadCapacity10_Data[5] = (u8)(Mass_Block_Size[lun] >>  16);
  ReadCapacity10_Data[6] = (u8)(Mass_Block_Size[lun] >>  8);
  ReadCapacity10_Data[7] = (u8)(Mass_Block_Size[lun]);
  Transfer_Data_Request(ReadCapacity10_Data, READ_CAPACITY10_DATA_LEN);
}
 
上面红色部分,(1)句发送CSW, (2)句就立刻中止In端口, 这里到底是想发送还是不发送???????
如果是想发送, 那这里就是BUG;
如果是不想发送, 为什么不直接用Set_CSW (CSW_CMD_FAILED, SEND_CSW_DISABLE); 呢????