基于OHCI的USB主机 ―― UFI读状态代码

/**  * 读取错误原因  * @param *buf 存放读取出来数据的缓冲区  * @return 0 - 成功  */ short ufiRequestSense( BYTE *buf) {     REQUEST_SENSE *request;     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 = 0x12;     cbw-> bCBW_Flag =0x80;     cbw-> bCBW_LUN =0;     cbw-> bCBW_CDBLen = 0x0C; //sizeof(CDB_RBC);       // 设置 UFI 命令参数     request = &(cbw-> cdbRBC . ufiRequestSense );     request-> OperationCode = 0x03;     request-> AllocationLen = 0x12;       // 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; }