帮忙看一下read函数

unsigned char CF_READ()
{
MassStorageCBW.dCBW_Signature=CBW_SIGNATURE;
MassStorageCBW.dCBW_Tag=0x60a624de;
MassStorageCBW.dCBW_DataXferLen=para[2]*512;
MassStorageCBW.bCBW_Flag=0x80;
MassStorageCBW.bCBW_LUN=0;//要修改
MassStorageCBW.bCBW_CDBLen=sizeof(READ_RBC);//0x0C
/////////////////////////////////////
MassStorageCBW.cdbRBC.READ_RBC.OperationCode=read10;//28H
MassStorageCBW.cdbRBC.READ_RBC.VendorSpecific=0;//需要修改
MassStorageCBW.cdbRBC.READ_RBC.LBA.LBA_W8.LBA_3=para[6];
MassStorageCBW.cdbRBC.READ_RBC.LBA.LBA_W8.LBA_2=para[5];
MassStorageCBW.cdbRBC.READ_RBC.LBA.LBA_W8.LBA_1=para[4];
MassStorageCBW.cdbRBC.READ_RBC.LBA.LBA_W8.LBA_0=para[3];
MassStorageCBW.cdbRBC.READ_RBC.XferLength=para[2];
//////////////////////////////////////
if(!BULK_Transfer_OUT((unsigned char *)&MassStorageCBW,sizeof(MassStorageCBW)))
return FALSE;
DelayMs(5);
//len=36;
if(!BULK_Transfer_IN(BX,(para[2]*512)))//接收数据，BX=Adress of Buffer,接收数据长度，para[2]扇区数
return FALSE;
//DelayMs(1);
if(!BULK_Transfer_IN((unsigned char *)&MassStorageCSW,13))
return FALSE;
/////////////////////////////
return TRUE;
}
/*注释
para[1]=feature
para[2]=Sector Count
para[3]=Sector Number(LBA 7-0)
para[4]=Cylinder Low (LBA 15-8)
para[5]=Cylinder High (LBA 23-16)
para[6]=Head          (LBA 27-24)
*/
这样写有没有问题？
还有我的程序并没有判断CSW字段，实际工作中，是不是要检查一下CSW内容？