[参考译文] TMS320F28388D：使用 C28x CPU1 USB 在主机(MSC)和 DEC (CDC)之间切换

    if (USB_ID_iBit != oldID){
        oldID = USB_ID_iBit;
        if (USB_ID_iBit){
            bUsbHostMode = false;
            //
            // Device Mode
            // Kill the host mode
            //
            USBHCDTerm(0);
            USBHMSCDriveClose(g_psMSCInstance);
            //DeviceMode
                //
            // Initialize the transmit and receive buffers.
            //
            USBBufferInit(&g_sTxBuffer);
            USBBufferInit(&g_sRxBuffer);
            //
            // Pass our device information to the USB library and place the device
            // on the bus.
            //
            USBDCDCInit(0, &g_sCDCDevice);
        
            //create que for receive data
            make_queue_char(&usbcdc_receive_queue,buf_usbcdc_receive_queue,QUEUE_LENGTH_USBCDC_RECV);
            make_queue_char(&usbcdc_receive_2nd_queue,buf_usbcdc_receive_2nd_queue,QUEUE_LENGTH_USBCDC_RECV_2ND);
            make_queue_char(&usbcdc_send_queue,buf_usbcdc_send_queue,QUEUE_LENGTH_USBCDC_SEND);
        }
        else{
            bUsbHostMode = true;
            //
            // Host Mode
            // Kill the Device mode
            //
            USBDCDCTerm((void *)&g_sCDCDevice);
            //HostMode
        	USBStackModeSet(0, eUSBModeForceHost, ModeCallback);
        	UsbHostStackInit();
        	USBHCDInit(0,g_pHCDPool, HCD_MEMORY_SIZE);
            f_mount(0, &g_sFatFs);
        }
    }