基于OHCI的USB主机 ―― UFI读容量代码

/**  * 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; }