示例#1
0
文件: usb.c 项目: jidongxiao/twinkvm
static void
usb_hub_port_setup(void *data)
{
    struct usbdevice_s *usbdev = data;
    struct usbhub_s *hub = usbdev->hub;
    u32 port = usbdev->port;

    for (;;) {
        // Detect if device present (and possibly start reset)
        int ret = hub->op->detect(hub, port);
        if (ret > 0)
            // Device connected.
            break;
        if (ret < 0 || timer_check(hub->detectend))
            // No device found.
            goto done;
        msleep(5);
    }

    // XXX - wait USB_TIME_ATTDB time?

    // Reset port and determine device speed
    mutex_lock(&hub->cntl->resetlock);
    int ret = hub->op->reset(hub, port);
    if (ret < 0)
        // Reset failed
        goto resetfail;
    usbdev->speed = ret;

    // Set address of port
    ret = usb_set_address(usbdev);
    if (ret) {
        hub->op->disconnect(hub, port);
        goto resetfail;
    }
    mutex_unlock(&hub->cntl->resetlock);

    // Configure the device
    int count = configure_usb_device(usbdev);
    usb_free_pipe(usbdev, usbdev->defpipe);
    if (!count)
        hub->op->disconnect(hub, port);
    hub->devcount += count;
done:
    hub->threads--;
    free(usbdev);
    return;

resetfail:
    mutex_unlock(&hub->cntl->resetlock);
    goto done;
}
示例#2
0
/*
 * WARNING - If a driver calls usb_reset_device, you should simulate a
 * disconnect() and probe() for other interfaces you doesn't claim. This
 * is left up to the driver writer right now. This insures other drivers
 * have a chance to re-setup their interface.
 *
 * Take a look at proc_resetdevice in devio.c for some sample code to
 * do this.
 */
int usb_reset_device(struct usb_device *dev)
{
	struct usb_device *parent = dev->parent;
	struct usb_device_descriptor descriptor;
	int i, ret, port = -1;

    DBG_HOST_HUB("### >>> Enter hub.c file --> usb_reset_device function \n");
	if (!parent) {
		err("attempting to reset root hub!");
		return -EINVAL;
	}

	for (i = 0; i < parent->maxchild; i++)
		if (parent->children[i] == dev) {
			port = i;
			break;
		}

	if (port < 0)
		return -ENOENT;

	down(&usb_address0_sem);

	/* Send a reset to the device */
	if (usb_hub_port_reset(parent, port, dev, HUB_SHORT_RESET_TIME)) {
		usb_hub_port_disable(parent, port);
		up(&usb_address0_sem);
		return(-ENODEV);
	}

	/* Reprogram the Address */
	ret = usb_set_address(dev);
	if (ret < 0) {
		err("USB device not accepting new address (error=%d)", ret);
		usb_hub_port_disable(parent, port);
		up(&usb_address0_sem);
		return ret;
	}

	/* Let the SET_ADDRESS settle */
	wait_ms(10);

	up(&usb_address0_sem);

	/*
	 * Now we fetch the configuration descriptors for the device and
	 * see if anything has changed. If it has, we dump the current
	 * parsed descriptors and reparse from scratch. Then we leave
	 * the device alone for the caller to finish setting up.
	 *
	 * If nothing changed, we reprogram the configuration and then
	 * the alternate settings.
	 */
	ret = usb_get_descriptor(dev, USB_DT_DEVICE, 0, &descriptor,
			sizeof(descriptor));
	if (ret < 0)
		return ret;

	le16_to_cpus(&descriptor.bcdUSB);
	le16_to_cpus(&descriptor.idVendor);
	le16_to_cpus(&descriptor.idProduct);
	le16_to_cpus(&descriptor.bcdDevice);

	if (memcmp(&dev->descriptor, &descriptor, sizeof(descriptor))) {
		usb_destroy_configuration(dev);

		ret = usb_get_device_descriptor(dev);
		if (ret < sizeof(dev->descriptor)) {
			if (ret < 0)
				err("unable to get device descriptor (error=%d)", ret);
			else
				err("USB device descriptor short read (expected %Zi, got %i)", sizeof(dev->descriptor), ret);
        
			clear_bit(dev->devnum, &dev->bus->devmap.devicemap);
			dev->devnum = -1;
			return -EIO;
		}

		ret = usb_get_configuration(dev);
		if (ret < 0) {
			err("unable to get configuration (error=%d)", ret);
			usb_destroy_configuration(dev);
			clear_bit(dev->devnum, &dev->bus->devmap.devicemap);
			dev->devnum = -1;
			return 1;
		}

		dev->actconfig = dev->config;
		usb_set_maxpacket(dev);

		return 1;
	}

	ret = usb_set_configuration(dev, dev->actconfig->bConfigurationValue);
	if (ret < 0) {
		err("failed to set active configuration (error=%d)", ret);
		return ret;
	}

	for (i = 0; i < dev->actconfig->bNumInterfaces; i++) {
		struct usb_interface *intf = &dev->actconfig->interface[i];
		struct usb_interface_descriptor *as = &intf->altsetting[intf->act_altsetting];

		ret = usb_set_interface(dev, as->bInterfaceNumber, as->bAlternateSetting);
		if (ret < 0) {
			err("failed to set active alternate setting for interface %d (error=%d)", i, ret);
			return ret;
		}
	}

	return 0;
}
示例#3
0
static void usbhub_scan_ports(usbdev_t *dev,void *arg)
{
    uint16_t current;
    uint16_t changed;
    usbhub_softc_t *softc;
    int idx;
    int res;
    int len;
    uint8_t *buf;
    usbdev_t *newdev;
    usb_driver_t *newdrv;
    int addr;
    usb_port_status_t *portstatus;
    usb_config_descr_t cfgdescr;
    unsigned int powerondelay;

    if (!IS_HUB(dev)) return;		/* should not happen.  */

    portstatus = usb_dma_alloc(sizeof(usb_port_status_t));
    if (portstatus == NULL) return;

    /*
     * We know this is a hub.  Get the softc back.
     */

    softc = (usbhub_softc_t *) dev->ud_private;

    powerondelay = ((unsigned int) softc->uhub_descr.bPowerOnToPowerGood)*2 + 20;

    /*
     * Turn on the power to the ports whose power is not yet on.
     */

    for (idx = 0; idx < softc->uhub_nports; idx++) {

	usbhub_get_port_status(dev,idx+1,portstatus);

	current = GETUSBFIELD(portstatus,wPortStatus);
	changed = GETUSBFIELD(portstatus,wPortChange);
	if (usb_noisy > 1) {
	    printf("BeforePowerup: port %d status %04X changed %04X\n",idx+1,current,changed);
	    }

	if (!(current & USB_PORT_STATUS_POWER)) {
	    if (usb_noisy > 1) console_log("USB: Powering up bus %d port %d",
				      dev->ud_bus->ub_num,idx+1);
	    usbhub_set_port_feature(dev,idx+1,USB_PORT_FEATURE_POWER);
	    usb_delay_ms(dev->ud_bus,powerondelay);
	    }
	}

    /*
     * Begin exploration at this level.
     */

    for (idx = 0; idx < softc->uhub_nports; idx++) {

	usbhub_get_port_status(dev,idx+1,portstatus);

	current = GETUSBFIELD(portstatus,wPortStatus);
	changed = GETUSBFIELD(portstatus,wPortChange);

	if (usb_noisy > 0) {
	    printf("USB: Explore: Bus %d Hub %d port %d status %04X changed %04X\n",
		   dev->ud_bus->ub_num,
		   dev->ud_address,idx+1,current,changed);
	    usb_dbg_dumpportstatus(idx+1,portstatus,1);
	    }


//	if (changed & USB_PORT_STATUS_RESET) {
//	    usbhub_clear_port_feature(dev,idx+1,USB_PORT_FEATURE_C_PORT_RESET);
//	    }

	if (changed & USB_PORT_STATUS_ENABLED) {
	    usbhub_clear_port_feature(dev,idx+1,USB_PORT_FEATURE_C_PORT_ENABLE);
	    }

	if (changed & USB_PORT_STATUS_CONNECT) {
	    /*
	     * A device was either connected or disconnected.
	     * Clear the status change first.
	     */

	    usbhub_clear_port_feature(dev,idx+1,USB_PORT_FEATURE_C_PORT_CONNECTION);

	    if (current & USB_PORT_STATUS_CONNECT) {

		/*
		 * The device has been CONNECTED.
		 */

		console_log("USB: New device connected to bus %d hub %d port %d",
			    dev->ud_bus->ub_num,
			    dev->ud_address,idx+1);

		/*
		 * Reset the device.  Reuse our old port status structure
		 * so we get the latest status.  Some devices do not report
		 * lowspeed until they are reset.
		 */

		usbhub_reset_device(dev,idx+1,portstatus);
		current = GETUSBFIELD(portstatus,wPortStatus);
		changed = GETUSBFIELD(portstatus,wPortChange);

		/*
		 * Create a device for this port.
		 */

		newdev = usb_create_device(dev->ud_bus,(current & USB_PORT_STATUS_LOWSPD) ? 1 : 0);

		/*
		 * Get the device descriptor. 
		 */

		res = usb_get_device_descriptor(newdev,&newdev->ud_devdescr,TRUE);

		if (usb_noisy > 1) usb_dbg_dumpdescriptors(newdev,(uint8_t *) &(newdev->ud_devdescr),8);

		/*
		 * Set up the max packet size for the control endpoint,
		 * then get the rest of the descriptor.
		 */
    
		usb_set_ep0mps(newdev,newdev->ud_devdescr.bMaxPacketSize0);
		res = usb_get_device_descriptor(newdev,&newdev->ud_devdescr,FALSE);

		/*
		 * Obtain a new address and set the address of the
		 * root hub to this address.
		 */

		addr = usb_new_address(newdev->ud_bus);
		res = usb_set_address(newdev,addr);

		/*
		 * Get the configuration descriptor and all the
		 * associated interface and endpoint descriptors.
		 */

		res = usb_get_config_descriptor(newdev,&cfgdescr,0,
						sizeof(usb_config_descr_t));
		if (res != sizeof(usb_config_descr_t)) {
		    printf("[a] usb_get_config_descriptor returns %d\n",res);
		    }

		len = GETUSBFIELD(&cfgdescr,wTotalLength);
		buf = usb_dma_alloc(len);

		res = usb_get_config_descriptor(newdev,(usb_config_descr_t *)buf,0,len);
		if (res != len) {
		    printf("[b] usb_get_config_descriptor returns %d\n",res);
		    }

		newdev->ud_cfgdescr = (usb_config_descr_t *) buf;

		if (usb_noisy > 1) usb_dbg_dumpdescriptors(newdev,buf,len);

		/*
		 * Point the hub at the devices it owns
		 */

		softc->uhub_devices[idx] = newdev;

		/*
		 * Find the driver for this.  It had better be the hub
		 * driver.
		 */

		newdrv = usb_find_driver(newdev);

		/*
		 * Call the attach method.
		 */

		if (newdrv) {
		    newdev->ud_drv = newdrv;	/* remember driver dispatch in device */
		    (*(newdrv->udrv_attach))(newdev,newdrv);
		    }
		}

	    else {

		/*
		 * The device has been DISCONNECTED.
		 */

		console_log("USB: Device disconnected from bus %d hub %d port %d",
			    dev->ud_bus->ub_num,
			    dev->ud_address,idx+1);

		/*
		 * Recover pointer to device below hub and clear
		 * this pointer.
		 */

		newdev = softc->uhub_devices[idx];	/* Get device pointer */

		usbhub_markdetached(newdev);		/* mark device and all subordinate 
							   devices as "removing" */

		softc->uhub_devices[idx] = NULL;	/* remove device from hub */

		/*
		 * Deassign the USB device's address and then 
		 * call detach method to free resources.  Devices that
		 * do not have drivers will not have any methods.
		 */

		if (newdev) {
		    if (newdev->ud_drv) {
			/* close open pipes, cancel reqs */
			usb_destroy_all_pipes(newdev);
			/* 
			 * Try to process the done queue.  This will complete any
			 * requests that made it out of the pipes while we were
			 * doing the stuff above.
			 */
			usb_poll(newdev->ud_bus);
			/* Call detach method, clean up device softc */
			(*(newdev->ud_drv->udrv_detach))(newdev);
			}
		    else {
			if (usb_noisy > 0) {
			    console_log("USB: Detached device on bus %d hub %d port %d "
				   "has no methods",
				   dev->ud_bus->ub_num,
				   dev->ud_address,idx+1);
			    }
			}

		    if (newdev->ud_cfgdescr) usb_dma_free(newdev->ud_cfgdescr);

		    usb_destroy_device(newdev);	
		    }

		}
	    }

	}

    usb_dma_free(portstatus);

    /*
     * Queue up a request for the interrupt pipe.  This will catch further
     * changes at this port.
     */

    usbhub_queue_intreq(dev,softc);

}
示例#4
0
//! 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 bRequest;

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

  switch (bRequest)
  {
  case GET_DESCRIPTOR:
    if (bmRequestType == 0x80) usb_get_descriptor();
    else goto unsupported_request;
    break;

  case GET_CONFIGURATION:
    if (bmRequestType == 0x80) usb_get_configuration();
    else goto unsupported_request;
    break;

  case SET_ADDRESS:
    if (bmRequestType == 0x00) usb_set_address();
    else goto unsupported_request;
    break;

  case SET_CONFIGURATION:
    if (bmRequestType == 0x00) usb_set_configuration();
    else goto unsupported_request;
    break;

  case CLEAR_FEATURE:
    if (bmRequestType <= 0x02) usb_clear_feature();
    else goto unsupported_request;
    break;

  case SET_FEATURE:
    if (bmRequestType <= 0x02) usb_set_feature();
    else goto unsupported_request;
    break;

  case GET_STATUS:
    if (0x7F < bmRequestType && bmRequestType <= 0x82) usb_get_status();
    else goto unsupported_request;
    break;

  case GET_INTERFACE:
    if (bmRequestType == 0x81)
    {
      if(!usb_get_interface())
      {
        Usb_enable_stall_handshake(EP_CONTROL);
        Usb_ack_setup_received_free();
      }
    }
    else goto unsupported_request;
    break;

  case SET_INTERFACE:
    if (bmRequestType == 0x01) usb_set_interface();
    else 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, bRequest))
    {
      Usb_enable_stall_handshake(EP_CONTROL);
      Usb_ack_setup_received_free();
    }
    break;
  }
}
示例#5
0
static void usb_setup_set_address(int adr)
{
    usb_set_address(adr);
    usb_state = adr ? STATE_ADDRESS : STATE_DEFAULT;
    usb_status_ack(DIR_TX);
}
示例#6
0
void main() {
	// mod, added to patch config bits
	patch_config();

	output_high(LEDR);
	output_low(LEDG);
   
	usb_init();
   
	setup_timer_0(RTCC_INTERNAL|RTCC_DIV_4);
	set_timer0(0x8ad0);

	enable_interrupts(GLOBAL);
	enable_interrupts(INT_TIMER0);

	while(1) {
	
	#if defined (BOARD_AVRUSB12_32)
		  //Mod here we check pin status to see if we must reset device
	  if(!input(PIN_B7)) {
					delay_ms(25);	//debounce
					if(!input(PIN_B7)) {	//its a press
						output_bit(LEDG,1);					
						delay_ms(500);	//for long press detection, 
						if(!input(PIN_B7)) {	//its still a press after 1 sec
							PINRST_BTL();			//reset device
						}						
						output_bit(LEDG,0);			
					}					
		}
	#endif
		
		usb_task();
		usb_isr();

		if(DelayCount) continue;

		if(Connect) {
			if(UADDR != HubAddress) {
				usb_set_address(HubAddress);
			}

			DevicePort = Connect;
			port_status[Connect - 1] = PORT_FULL;
			port_change[Connect - 1] = C_PORT_CONN;

			TxBuf[0] = 1 << Connect;
			if(Force0DTS)
				usb_put_packet(1, TxBuf, 1, 0);
			else
				usb_put_packet(1, TxBuf, 1, USB_DTS_TOGGLE);
			Connect = 0;
			Force0DTS = 0;
		}

		if(Reset) {
			TxBuf[0] = 1 << Reset;
			usb_put_packet(1, TxBuf, 1, USB_DTS_TOGGLE);
			Reset = 0;
		}

		if(Disconnect) {
			if(UADDR != HubAddress)
				usb_set_address(HubAddress);
			DevicePort = Disconnect;
			port_status[Disconnect - 1] = PORT_EMPTY;
			port_change[Disconnect - 1] = C_PORT_CONN;
			TxBuf[0] = 1 << Disconnect;
			usb_put_packet(1, TxBuf, 1, USB_DTS_TOGGLE);
			Disconnecting = Disconnect;
			Disconnect = 0;
		}

		if(WaitJig) {
			if(WaitJig == 1) {
				if(usb_kbhit(2)) {
					unsigned char c;
					Chirp();
					c = usb_get_packet(2, TxBuf, 8);
					nJigs++;
					EP_BDxST_I(1) = 0x40;   //Clear IN endpoint
					if(nJigs == 8) {
						nJigs = 0;
						WaitJig = 2;
						Delay10ms(50);
					}
				}
			}
			else {
				int n = 0;
				for(n = 0; n < 8; ++n) {
					TxBuf[n] = jig_response[8 * nJigs + n];
				}
				if(usb_put_packet(1, TxBuf, 8, nJigs == 0 ? 0 : USB_DTS_TOGGLE)) {
					Delay10ms(1);
					nJigs++;
					Chirp();
					if(nJigs == 8) {
						nJigs = 0;
						WaitJig = 0;
						Delay10ms(15);
						Disconnect = 3;
					}
				}
			}
		}

		if(Address != -1) {
			delay_ms(1);
			usb_set_address(Address);
			Address = -1;
		}
	}
}
示例#7
0
//! usb_process_request.
//!
//! @brief 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.
//!
//! @param none
//!
//! @return none
//! @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;

   bmRequestType = Usb_read_byte();
   bmRequest     = Usb_read_byte();

   switch (bmRequest)
   {
    case GET_DESCRIPTOR:
         if (0x80 == bmRequestType) { usb_get_descriptor(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case GET_CONFIGURATION:
         if (0x80 == bmRequestType) { usb_get_configuration(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case SET_ADDRESS:
         if (0x00 == bmRequestType) { usb_set_address(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case SET_CONFIGURATION:
         if (0x00 == bmRequestType) { usb_set_configuration(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case CLEAR_FEATURE:
         if (0x02 >= bmRequestType) { usb_clear_feature(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case SET_FEATURE:
         if (0x02 >= bmRequestType) { usb_set_feature(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case GET_STATUS:
         if ((0x7F < bmRequestType) & (0x82 >= bmRequestType))
                                    { usb_get_status(); }
         else                       { usb_user_read_request(bmRequestType, bmRequest); }
         break;

    case GET_INTERFACE:
          if (bmRequestType == 0x81) { usb_get_interface(); }
          else { usb_user_read_request(bmRequestType, bmRequest); }
          break;


    case SET_INTERFACE:
      if (bmRequestType == 0x01) {usb_set_interface();}
      break;

    case SET_DESCRIPTOR:
    case SYNCH_FRAME:
    default: //!< un-supported request => call to user read request
         if(usb_user_read_request(bmRequestType, bmRequest) == FALSE)
         {
            Usb_enable_stall_handshake();
            Usb_ack_receive_setup();
            return;
         }
         break;
  }
}
//! usb_process_request.
//!
//! @brief 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.
//!
//! @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;

   bmRequestType = Usb_read_byte();
   bmRequest     = Usb_read_byte();

   switch (bmRequest)
   {
    case GET_DESCRIPTOR:
         if (0x80 == bmRequestType) { usb_get_descriptor(); }
         else goto user_read;
         break;

    case GET_CONFIGURATION:
         if (0x80 == bmRequestType) { usb_get_configuration(); }
         else goto user_read;
         break;

    case SET_ADDRESS:
         if (0x00 == bmRequestType) { usb_set_address(); }
         else goto user_read;
         break;

    case SET_CONFIGURATION:
         if (0x00 == bmRequestType) { usb_set_configuration(); }
         else goto user_read;
         break;

    case CLEAR_FEATURE:
         if (0x02 >= bmRequestType) { usb_clear_feature(); }
         else goto user_read;
         break;

    case SET_FEATURE:
         if (0x02 >= bmRequestType) { usb_set_feature(); }
         else goto user_read;
         break;

    case GET_STATUS:
         if ((0x7F < bmRequestType) & (0x82 >= bmRequestType))
                                    { usb_get_status(); }
         else goto user_read;
         break;

    case GET_INTERFACE:
          if (bmRequestType == 0x81) { usb_get_interface(); }
		  else goto user_read;
          break;


    case SET_INTERFACE:
      if (bmRequestType == 0x01) {usb_set_interface();}
      break;

    case SET_DESCRIPTOR:
    case SYNCH_FRAME:
    default: //!< un-supported request => call to user read request
	user_read:
         usb_user_read_request(bmRequestType, bmRequest);
         break;
  }
	
	Usb_select_endpoint(EP_CONTROL);

	// If the receive setup flag hasn't been cleared
	// by this point then we can assume that we didn't
	// support this request and should stall.
	if(Is_usb_receive_setup())
		Usb_enable_stall_handshake();
	
	// Clear some flags.
	Usb_ack_receive_setup();
	Usb_ack_receive_out();
	Usb_ack_in_ready();
}
/*
 * Read the SETUP request sent to the default control endpoint
 * and call the appropriate function. When exiting this
 * function, the device is ready to manage the next request.
 *
 * Supported requests:
 * GET_DESCRIPTOR
 * GET_CONFIGURATION
 * SET_ADDRESS
 * SET_CONFIGURATION
 * CLEAR_FEATURE
 * SET_FEATURE
 * GET_STATUS
 */
void
OSUsbDeviceImpl::standardProcessRequest(void)
{
  unsigned char bmRequest;

  bmRequestType = OSUsbDeviceImpl::readByte();
  bmRequest = OSUsbDeviceImpl::readByte();

#if defined(DEBUG) && defined(OS_DEBUG_OSUSBDEVICE_REQUEST)
  OSDeviceDebug::putString("type/req=");
  OSDeviceDebug::putHex(bmRequestType);
  OSDeviceDebug::putString("/");
  OSDeviceDebug::putHex(bmRequest);
  OSDeviceDebug::putString(" ");
  //OSDeviceDebug::putNewLine();
#endif

  switch (bmRequest)
    {
  case GET_DESCRIPTOR:
    if (0x80 == bmRequestType)
      {
        OSUsbDeviceImpl::usb_get_descriptor();
        return;
      }
    break;

  case GET_CONFIGURATION:
    if (0x80 == bmRequestType)
      {
        usb_get_configuration();
        return;
      }
    break;

  case SET_ADDRESS:
    if (0x00 == bmRequestType)
      {
        usb_set_address();
        return;
      }
    break;

  case SET_CONFIGURATION:
    if (0x00 == bmRequestType)
      {
        usb_set_configuration();
        return;
      }
    break;

  case CLEAR_FEATURE:
    if (0x02 >= bmRequestType)
      {
        usb_clear_feature();
        return;
      }
    break;

  case SET_FEATURE:
    if (0x02 >= bmRequestType)
      {
        usb_set_feature();
        return;
      }
    break;

  case GET_STATUS:
    if ((0x7F < bmRequestType) & (0x82 >= bmRequestType))
      {
        usb_get_status();
        return;
      }
    break;

  case GET_INTERFACE:
    if (bmRequestType == 0x81)
      {
        usb_get_interface();
        return;
      }
    break;

  case SET_INTERFACE:
    if (bmRequestType == 0x01)
      {
        usb_set_interface();
        return;
      }
    break;

  case SET_DESCRIPTOR:
  case SYNCH_FRAME:
  default:
    break;
    }

  // for un-supported requests call the specific read request
  if (OSUsbDeviceImpl::specificProcessReadRequest(bmRequestType, bmRequest))
    return;

  // if nothing worked, reply with stall
  OSUsbDeviceImpl::Usb_enable_stall_handshake();
  OSUsbDeviceImpl::Usb_ack_receive_setup();
}
//! @brief 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.
//!
void usb_process_request(void)
{
   U8 bmRequestType;
   U8 bmRequest;

   Usb_ack_control_out();
   bmRequestType = Usb_read_byte();
   bmRequest     = Usb_read_byte();

   switch (bmRequest)
   {
      case SETUP_GET_DESCRIPTOR:
      if (USB_SETUP_GET_STAND_DEVICE == bmRequestType)
      {     
         if( usb_get_descriptor() )
            return;
      }
      break;

      case SETUP_GET_CONFIGURATION:
      if (USB_SETUP_GET_STAND_DEVICE == bmRequestType)
      {
         usb_get_configuration();
         return;
      }
      break;

      case SETUP_SET_ADDRESS:
      if (USB_SETUP_SET_STAND_DEVICE == bmRequestType)
      {
         usb_set_address();
         return;
      }
      break;

      case SETUP_SET_CONFIGURATION:
      if (USB_SETUP_SET_STAND_DEVICE == bmRequestType)
      { 
         if( usb_set_configuration() )
            return;
      }
      break;

      case SETUP_CLEAR_FEATURE:
      if (usb_clear_feature(bmRequestType))
         return;
      break;

      case SETUP_SET_FEATURE:
      if (usb_set_feature(bmRequestType))
         return;
      break;

      case SETUP_GET_STATUS:
      if (usb_get_status(bmRequestType))
         return;
      break;

      case SETUP_GET_INTERFACE:
      if (USB_SETUP_GET_STAND_INTERFACE == bmRequestType)
      {
         if( usb_get_interface() )
            return;
      }
      break;

      case SETUP_SET_INTERFACE:
      if (bmRequestType == USB_SETUP_SET_STAND_INTERFACE)
      {
         if( usb_set_interface() )
            return;
      }
      break;

      default:
      break;
   }

   // un-supported like standard request => call to user read request
   if( !usb_user_read_request(bmRequestType, bmRequest) )
   {
      // Request unknow in the specific request list from interface
      // keep that order (set StallRq/clear RxSetup) or a
      // OUT request following the SETUP may be acknowledged
      Usb_enable_stall_handshake();
      Usb_ack_receive_setup();
      endpoint_status[(EP_CONTROL & MSK_EP_DIR)] = 0x01;
   }
}