CC2531EMK: CC2531 USB Device, vendor specific protocol

Dattatray Hinge

Part Number: CC2531EMK
Other Parts Discussed in Thread: CC2531

I am using CC2531 USB Dongle for product development and USB Sample example source code (swrc088) to develop vendor specific class and protocol, below is my descriptor config

Configuration Descriptor:
wTotalLength:       0x0019
bNumInterfaces:       0x01
bConfigurationValue:  0x01
iConfiguration:       0x00
bmAttributes:         0x80 (Bus Powered )
MaxPower:             0x19 (50 Ma)

Interface Descriptor:
bInterfaceNumber:     0x00
bAlternateSetting:    0x00
bNumEndpoints:        0x01
bInterfaceClass:      0xFF
bInterfaceSubClass:   0xFF
bInterfaceProtocol:   0xFF
iInterface:           0x00

Endpoint Descriptor:
bEndpointAddress:     0x83  IN
Transfer Type:        Bulk
wMaxPacketSize:     0x0040 (64)
bInterval:            0x05

and below is wireshark dump of my packet, as per usb_framework.c I should receive data in usbSetupData.pBuffer (usbfwSetupHandler() ) but when I debug I always see some garbage data.

void usbfwSetupHandler(void)
{
   uint8 controlReg;
   uint8 bytesNow;
   uint8 oldEndpoint;

   // Save the old index setting, then select endpoint 0 and fetch the control register
   oldEndpoint = USBFW_GET_SELECTED_ENDPOINT();
   USBFW_SELECT_ENDPOINT(0);
   controlReg = USBCS0;

   
   // Receive OUT packets
   if (usbfwData.ep0Status == EP_RX) {

      // Read FIFO
      bytesNow = USBCNT0;
      usbfwReadFifo(&USBF0, bytesNow, usbSetupData.pBuffer);
      usbSetupData.bytesLeft -= bytesNow;
      usbSetupData.pBuffer += bytesNow;

      // Arm the endpoint
      USBCS0 = usbSetupData.bytesLeft ? USBCS0_CLR_OUTPKT_RDY : (USBCS0_CLR_OUTPKT_RDY | USBCS0_DATA_END);

      // Make a call to the appropriate request handler when done
      if (usbSetupData.bytesLeft == 0) {
         if (ProcessFunc) ProcessFunc();
         usbfwData.ep0Status = EP_IDLE;
      }

      // Return here since nothing more will happen until the next interrupt
      USBFW_SELECT_ENDPOINT(oldEndpoint);
      return;

   // Let the application handle the reception
   } else if (usbfwData.ep0Status == EP_MANUAL_RX) {
      ProcessFunc();
   }

please advice what I am missing here

over 6 years ago

0 Dattatray Hinge over 6 years ago

Expert 1090 points

I figured out what is the problem usbfwSetupHandler(), FIFO Read has to be interrupt protected, below is the final tested code

   // Receive OUT packets
   if (usbfwData.ep0Status == EP_RX) {
	   
		HAL_ENTER_CRITICAL_SECTION(intState);
		
		// Read FIFO
		bytesNow = USBCNT0;
		usbfwReadFifo(&USBF0, bytesNow, usbSetupData.pBuffer);
		usbSetupData.bytesLeft -= bytesNow;
		usbSetupData.pBuffer += bytesNow;
		
	    HAL_EXIT_CRITICAL_SECTION(intState);
		
      // Arm the endpoint
      USBCS0 = usbSetupData.bytesLeft ? USBCS0_CLR_OUTPKT_RDY : (USBCS0_CLR_OUTPKT_RDY | USBCS0_DATA_END);

      // Make a call to the appropriate request handler when done
      if (usbSetupData.bytesLeft == 0) {
		  if (ProcessFunc) { 
			ProcessFunc();
		  }
         usbfwData.ep0Status = EP_IDLE;
      }

      // Return here since nothing more will happen until the next interrupt
      USBFW_SELECT_ENDPOINT(oldEndpoint);
      return;

   // Let the application handle the reception
   }

0 Ryan Brown1 over 6 years ago in reply to Dattatray Hinge

TI__Guru**** 219527 points

Hi Dattatray,

Thank you for following up and providing your solution!

Regards,
Ryan

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CC2531EMK: CC2531 USB Device, vendor specific protocol