基于OHCI的USB主机 ―― UFI命令监视代码

在调用完上面的 UFI 命令后， ufiCmdRunning.state 就被设置为 UFI_STATE_BEGIN 态，在主循环中调用本函数，用来判断 UFI 命令是否执行完毕，以及是否执行成功。

/**  * UFI 命令监视函数，判断命令是否执行完毕，底层有错误则进行容错处理  */ short funUfiRunning( void ) {     switch (ufiCmdRunning. state )     {        // 开始运行命令        case UFI_STATE_BEGIN:            usbTimer = 0;            ufiCmdRunning. count = 0;            ufiCmdRunning. state = UFI_STATE_RUNNING;            break ;          // 命令运行中        case UFI_STATE_RUNNING:            // 检查命令是否执行完毕            if (usbIsCmdOver() == USB_CMD_OVER)            {               //USB 协议层命令执行失败               if (usbGetCmdResult() != 0)               {                   // 底层命令执行失败后，对端口复位后重新执行，重新执行超过 150 次则认为失败                   ufiCmdRunning. count ++;                     if (ufiCmdRunning. count > 150)                   {                      ufiCmdRunning. error = UFI_ERR_MUCH_ERR;                      ufiCmdRunning. state = UFI_STATE_OVER;                   }                   else                   {                      // 复位 BulkOut 端口                      usbClearBulkOut();                      ufiCmdRunning. state = UFI_STATE_RESET_OUT;                   }                   break ;               }                 //UFI 命令执行成功               if ((ufiCmdRunning. csw . bCSW_Status ) == 0x00 && (ufiCmdRunning. csw . dCSW_Signature == 0x53425355))               {                   ufiCmdRunning. error = 0;               }               //UFI 命令执行失败               else               {                   ufiCmdRunning. error = UFI_ERR_CSW;               }               ufiCmdRunning. state = UFI_STATE_OVER;            }            // 底层命令超时，返回失败            else if (usbTimer >= 200)            {               ufiCmdRunning. error = UFI_ERR_TIMEOUT;               ufiCmdRunning. state = UFI_STATE_OVER;            }            break ;          //BulkOut 端口复位结束        case UFI_STATE_RESET_OUT:            if (usbIsCmdOver() == USB_CMD_OVER)            {               // 复位 BulkIn 端口               usbClearBulkIn();               ufiCmdRunning. state = UFI_STATE_RESET_IN;            }            break ;          //BulkIn 端口复位结束        case UFI_STATE_RESET_IN:            if (usbIsCmdOver() == USB_CMD_OVER)            {               // 读取端口错误原因               ufiRequestSense(bulkDataBuf);               ufiCmdRunning. state = UFI_STATE_REQUEST_SENSE;            }            break ;          // 端口错误原因读取完毕        case UFI_STATE_REQUEST_SENSE:            if (usbIsCmdOver() == USB_CMD_OVER)            {               // 重新执行底层 Bulk 命令               ufiCmdRunning. funUfiCmd (( unsigned char *)&ufiCmdRunning. cbw , ufiCmdRunning. pBuf , ( unsigned char *)&ufiCmdRunning. csw );                 usbTimer = 0;               ufiCmdRunning. state = UFI_STATE_RUNNING;            }            break ;     }     return ufiCmdRunning. state ; }