TMS320F28388D: Switch between HOST (MSC) and DEC (CDC) with C28x CPU1 USB

Hi Sasaki,

Sh.Sasaki said:

They are programming with usb_ex8_dual_detect as a reference, but once they recognize the MSC, they can't switch to the CDC without resetting the device.

This example checks the state of GPIO 47 in the while loop to switch between Host and device modes. Can you check the GPIO47 data register for the value being read by the c2000 device?

Best,

Kevin

Hi Kevin-san,

Thank you for your reply.

Yes. They check the GPIO47 data register.

Their USB switching code is below. Is this code incorrect?

    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);
        }
    }

Best regards,
Sasaki

Sasaki,

What is the code  for "USB_ID_iBit" ?   Is it reading the GPIO47 pin?

Best Regards

Siddharth

Hi Siddharth-san,

Thank you for your reply.

USB_ID_iBit is connected to GPIO114.

The customer is using TUSB320LI and this IC outputs USB_ID. Since this USB_ID signal is connected to GPIO114, the program can branch to a USB Host or Device.

By the way, is there example project that can switch between MSC (USB memory) and CDC (serial port) with ControlCARD? If there is, I would like to confirm it there.

Best regards,
Sasaki

Sasaki,

There is no specific example that can switch between MSC and CDC , however usb_ex8_dual_detect example can be used as reference

Best Regards

Siddharth

Hi Siddharth-san,

They have already referred to that example. Please let me know if there are any problems with their code.

Best Reagrds,
Sasaki

Siddharth-san,

Thank you for your support.

OK. I will check with my customer.

Best regards,
Sasaki