基于OHCI的USB主机 —— UFI读容量代码

简介:
/**

  读磁盘容量命令

 * @param *buf  数据缓冲区指针

 * @return 0 -  成功

 */

short  ufiReadCapacity( BYTE  *buf)

{

     READ_CAPACITY  *readCapacity;

     BYTE  i;

     CBW  *cbw;

 

     // 设置 Bulk-Only 协议参数

    cbw = &ufiCmdRunning. cbw ;

    cbw-> dCBW_Signature  = CBW_SIGNATURE;

    cbw-> dCBW_Tag  = 0x60a624de;

    cbw-> dCBW_DataXferLen  = 0x08;

    cbw-> bCBW_Flag =0x80;

    cbw-> bCBW_LUN =0;

    cbw-> bCBW_CDBLen  = 0x0A; //sizeof(CDB_RBC);

 

     // 设置 UFI 命令参数

    readCapacity = &(cbw-> cdbRBC . ufiReadCapacity );

    readCapacity-> OperationCode  = 0x25;

     for (i = 0; i <  sizeof (readCapacity-> Reserved ); i++)

       readCapacity-> Reserved [i] = 0;

 

     // 设置状态扫描函数所需要的参数

    ufiCmdRunning. funUfiCmd  = bulkRead;

    ufiCmdRunning. pBuf  = buf;

    ufiCmdRunning. state  = UFI_STATE_BEGIN;

 

     // 通过 Bulk 端口发送读命令

    bulkRead(( unsigned   char  *)&ufiCmdRunning. cbw , buf, ( unsigned   char *)&ufiCmdRunning. csw );

     return  0;

}





本文转自 tywali 51CTO博客,原文链接:http://blog.51cto.com/lancelot/317091,如需转载请自行联系原作者
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