//! This function reads the SETUP request sent to the default control endpoint
//! and calls the appropriate function. When exiting of the usb_read_request
//! function, the device is ready to manage the next request.
//!
//! If the received request is not supported or a non-standard USB request, the function
//! will call the custom decoding function in usb_specific_request module.
//!
//! @note List of supported requests:
//! GET_DESCRIPTOR
//! GET_CONFIGURATION
//! SET_ADDRESS
//! SET_CONFIGURATION
//! CLEAR_FEATURE
//! SET_FEATURE
//! GET_STATUS
//!
void usb_process_request(void)
{
  U8 bmRequest;

  Usb_reset_endpoint_fifo_access(EP_CONTROL);
  bmRequestType = Usb_read_endpoint_data(EP_CONTROL, 8);
  bmRequest     = Usb_read_endpoint_data(EP_CONTROL, 8);

  switch (bmRequest)
  {
  case GET_DESCRIPTOR:
    if (bmRequestType == 0x80) usb_get_descriptor();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case GET_CONFIGURATION:
    if (bmRequestType == 0x80)
    	usb_get_configuration();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case SET_ADDRESS:
    if (bmRequestType == 0x00) usb_set_address();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case SET_CONFIGURATION:
    if (bmRequestType == 0x00)
    	usb_set_configuration();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case CLEAR_FEATURE:
    /*if (bmRequestType <= 0x02)*/ usb_clear_feature();
    //else {	asm volatile ("breakpoint"); goto unsupported_request; }
    break;

  case SET_FEATURE:
    if (bmRequestType <= 0x02) usb_set_feature();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case GET_STATUS:
    if (0x7F < bmRequestType && bmRequestType <= 0x82)
    	usb_get_status();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case GET_INTERFACE:
    if (bmRequestType == 0x81)
    	usb_get_interface();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case SET_INTERFACE:
    if (bmRequestType == 0x01)
    	usb_set_interface();
    else { asm volatile ("breakpoint");	goto unsupported_request; }
    break;

  case SET_DESCRIPTOR:
  case SYNCH_FRAME:
  default:  //!< unsupported request => call to user read request
unsupported_request:
    if (!usb_user_read_request(bmRequestType, bmRequest))
    {
      Usb_enable_stall_handshake(EP_CONTROL);
      Usb_ack_setup_received_free();
    }
    break;
  }
}