C++ LEDs_SetAllLEDs函数代码示例

/** Task to set the configuration of the attached device after it has been enumerated, and to read and process
 *  HID reports from the device and display the results onto the board LEDs.
 */
void Mouse_HID_Task(void)
{
	uint8_t ErrorCode;

	/* Switch to determine what user-application handled host state the host state machine is in */
	switch (USB_HostState)
	{
		case HOST_STATE_Addressed:
			puts_P(PSTR("Getting Config Data.\r\n"));

			/* Get and process the configuration descriptor data */
			if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
			{
				if (ErrorCode == ControlError)
				  puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
				else
				  puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));

				printf_P(PSTR(" -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

				/* Indicate error status */
				LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

				/* Wait until USB device disconnected */
				USB_HostState = HOST_STATE_WaitForDeviceRemoval;
				break;
			}

			/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
			if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
			{
				printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
				                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

				/* Indicate error status */
				LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

				/* Wait until USB device disconnected */
				USB_HostState = HOST_STATE_WaitForDeviceRemoval;
				break;
			}

			/* HID class request to set the mouse protocol to the Boot Protocol */
			USB_ControlRequest = (USB_Request_Header_t)
				{
					.bmRequestType = (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE),
					.bRequest      = HID_REQ_SetProtocol,
					.wValue        = 0,
					.wIndex        = 0,
					.wLength       = 0,
				};

			/* Select the control pipe for the request transfer */
			Pipe_SelectPipe(PIPE_CONTROLPIPE);

			/* Send the request, display error and wait for device detach if request fails */
			if ((ErrorCode = USB_Host_SendControlRequest(NULL)) != HOST_SENDCONTROL_Successful)
			{
				printf_P(PSTR(ESC_FG_RED "Control Error (Set Protocol).\r\n"
				                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

				/* Indicate error status */
				LEDs_SetAllLEDs(LEDMASK_USB_ERROR);

				/* Wait until USB device disconnected */
				USB_HostState = HOST_STATE_WaitForDeviceRemoval;
				break;
			}

			puts_P(PSTR("Mouse Enumerated.\r\n"));

			USB_HostState = HOST_STATE_Configured;
			break;
		case HOST_STATE_Configured:
			/* If a report has been received, read and process it */
			ReadNextReport();

			break;
	}
}

/** Event handler for the USB_Connect event. This indicates that the device is enumerating via the status LEDs and
 *  starts the library USB task to begin the enumeration and USB management process.
 */
void EVENT_USB_Device_Connect(void)
{
	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
}

/** Event handler for the library USB Configuration Changed event. */
void EVENT_USB_Device_ConfigurationChanged(void)
{
    LEDs_SetAllLEDs(LEDMASK_USB_READY);
    if (!MIDI_Device_ConfigureEndpoints(&Keyboard_MIDI_Interface))
	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
}

/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 *  stops the library USB task management process.
 */
void EVENT_USB_Host_DeviceUnattached(void)
{
	puts_P(PSTR("\r\nDevice Unattached.\r\n"));
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}

/** Event handler for the USB_Disconnect event. This indicates that the device is no longer connected to a host via
 *  the status LEDs and stops the USB management task.
 */
void EVENT_USB_Device_Disconnect(void)
{
	/* Indicate USB not ready */
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}

/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 *  enumerated by the host and is now ready to be used by the application.
 */
void EVENT_USB_Host_DeviceEnumerationComplete(void)
{
	LEDs_SetAllLEDs(LEDMASK_USB_READY);
}

/** Event handler for the USB_DeviceUnattached event. This indicates that a device has been removed from the host, and
 *  stops the library USB task management process.
 */
void EVENT_USB_Host_DeviceUnattached(void)
{
	puts_P(PSTR(ESC_FG_GREEN "\r\nDevice Unattached.\r\n" ESC_FG_WHITE));
	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
}

/** Main program entry point. This routine configures the hardware required by the application, then
 *  enters a loop to run the application tasks in sequence.
 */
int main(void)
{
	SetupHardware();

	puts_P(PSTR(ESC_FG_CYAN "CDC Host Demo running.\r\n" ESC_FG_WHITE));

	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
	sei();

	for (;;)
	{
		switch (USB_HostState)
		{
			case HOST_STATE_Addressed:
				LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);

				uint16_t ConfigDescriptorSize;
				uint8_t  ConfigDescriptorData[512];

				if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
				                                       sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
				{
					puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				if (CDC_Host_ConfigurePipes(&VirtualSerial_CDC_Interface,
				                            ConfigDescriptorSize, ConfigDescriptorData) != CDC_ENUMERROR_NoError)
				{
					puts_P(PSTR("Attached Device Not a Valid CDC Class Device.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
				{
					puts_P(PSTR("Error Setting Device Configuration.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				puts_P(PSTR("CDC Device Enumerated.\r\n"));
				LEDs_SetAllLEDs(LEDMASK_USB_READY);
				USB_HostState = HOST_STATE_Configured;
				break;
			case HOST_STATE_Configured:
				if (CDC_Host_BytesReceived(&VirtualSerial_CDC_Interface))
				{
					/* Echo received bytes from the attached device through the USART */
					int16_t ReceivedByte = CDC_Host_ReceiveByte(&VirtualSerial_CDC_Interface);
					if (!(ReceivedByte < 0))
					  putchar(ReceivedByte);
				}

				break;
		}

		CDC_Host_USBTask(&VirtualSerial_CDC_Interface);
		USB_USBTask();
	}
}

/** Main program entry point. This routine configures the hardware required by the application, then
 *  enters a loop to run the application tasks in sequence.
 */
int main(void)
{
	SetupHardware();

	puts_P(PSTR(ESC_FG_CYAN "Still Image Host Demo running.\r\n" ESC_FG_WHITE));

	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
	sei();

	for (;;)
	{
		switch (USB_HostState)
		{
			case HOST_STATE_Addressed:
				LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
			
				uint16_t ConfigDescriptorSize;
				uint8_t  ConfigDescriptorData[512];

				if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
				                                       sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
				{
					puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				if (SImage_Host_ConfigurePipes(&DigitalCamera_SI_Interface,
				                               ConfigDescriptorSize, ConfigDescriptorData) != SI_ENUMERROR_NoError)
				{
					puts_P(PSTR("Attached Device Not a Valid Still Image Class Device.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}
				
				if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
				{
					puts_P(PSTR("Error Setting Device Configuration.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}
				
				puts_P(PSTR("Still Image Device Enumerated.\r\n"));
				LEDs_SetAllLEDs(LEDMASK_USB_READY);
				USB_HostState = HOST_STATE_Configured;
				break;
			case HOST_STATE_Configured:
				puts_P(PSTR("Opening Session...\r\n"));
				
				if (SImage_Host_OpenSession(&DigitalCamera_SI_Interface) != PIPE_RWSTREAM_NoError)
				{
					puts_P(PSTR("Could not open PIMA session.\r\n"));
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				puts_P(PSTR("Turning off Device...\r\n"));

				SImage_Host_SendCommand(&DigitalCamera_SI_Interface, 0x1013, 0, NULL);
				if (SImage_Host_ReceiveResponse(&DigitalCamera_SI_Interface))
				{
					puts_P(PSTR("Could not turn off device.\r\n"));
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;					
				}

				puts_P(PSTR("Device Off.\r\n"));

				puts_P(PSTR("Closing Session...\r\n"));

				if (SImage_Host_CloseSession(&DigitalCamera_SI_Interface) != PIPE_RWSTREAM_NoError)
				{
					puts_P(PSTR("Could not close PIMA session.\r\n"));
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}
				
				LEDs_SetAllLEDs(LEDMASK_USB_READY);
				USB_HostState = HOST_STATE_WaitForDeviceRemoval;
				break;
		}
	
		SImage_Host_USBTask(&DigitalCamera_SI_Interface);
		USB_USBTask();
	}
}

/** Task to manage the Mass Storage interface, reading in Command Block Wrappers from the host, processing the SCSI commands they
 *  contain, and returning Command Status Wrappers back to the host to indicate the success or failure of the last issued command.
 */
void MassStorage_Task(void)
{
	/* Device must be connected and configured for the task to run */
	if (USB_DeviceState != DEVICE_STATE_Configured)
	  return;
	  
	/* Select the Data Out Endpoint */
	Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
	
	/* Check to see if a command from the host has been issued */
	if (Endpoint_IsReadWriteAllowed())
	{
		/* Indicate busy */
		LEDs_SetAllLEDs(LEDMASK_USB_BUSY);

		/* Process sent command block from the host */
		if (ReadInCommandBlock())
		{
			/* Check direction of command, select Data IN endpoint if data is from the device */
			if (CommandBlock.Flags & COMMAND_DIRECTION_DATA_IN)
			  Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);

			/* Decode the received SCSI command, set returned status code */
			CommandStatus.Status = SCSI_DecodeSCSICommand() ? Command_Pass : Command_Fail;		

			/* Load in the CBW tag into the CSW to link them together */
			CommandStatus.Tag = CommandBlock.Tag;

			/* Load in the data residue counter into the CSW */
			CommandStatus.DataTransferResidue = CommandBlock.DataTransferLength;
			
			/* Stall the selected data pipe if command failed (if data is still to be transferred) */
			if ((CommandStatus.Status == Command_Fail) && (CommandStatus.DataTransferResidue))
			  Endpoint_StallTransaction();

			/* Return command status block to the host */
			ReturnCommandStatus();

			/* Indicate ready */
			LEDs_SetAllLEDs(LEDMASK_USB_READY);
		}
		else
		{
			/* Indicate error reading in the command block from the host */
			LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
		}
	}

	/* Check if a Mass Storage Reset occurred */
	if (IsMassStoreReset)
	{
		/* Reset the data endpoint banks */
		Endpoint_ResetFIFO(MASS_STORAGE_OUT_EPNUM);
		Endpoint_ResetFIFO(MASS_STORAGE_IN_EPNUM);
		
		Endpoint_SelectEndpoint(MASS_STORAGE_OUT_EPNUM);
		Endpoint_ClearStall();
		Endpoint_ResetDataToggle();
		Endpoint_SelectEndpoint(MASS_STORAGE_IN_EPNUM);
		Endpoint_ClearStall();
		Endpoint_ResetDataToggle();

		/* Clear the abort transfer flag */
		IsMassStoreReset = false;
	}
}

/** Main program entry point. This routine configures the hardware required by the application, then
 *  enters a loop to run the application tasks in sequence.
 */
int main(void)
{
	SetupHardware();

	puts_P(PSTR(ESC_FG_CYAN "Mouse Host Demo running.\r\n" ESC_FG_WHITE));
	sei();

	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);

	for (;;)
	{
		switch (USB_HostState)
		{
			case HOST_STATE_Addressed:
				LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);

				uint16_t ConfigDescriptorSize;
				uint8_t  ConfigDescriptorData[512];

				if (USB_Host_GetDeviceConfigDescriptor(1, &ConfigDescriptorSize, ConfigDescriptorData,
				                                       sizeof(ConfigDescriptorData)) != HOST_GETCONFIG_Successful)
				{
					puts_P(PSTR("Error Retrieving Configuration Descriptor.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				if (HID_Host_ConfigurePipes(&Mouse_HID_Interface,
				                            ConfigDescriptorSize, ConfigDescriptorData) != HID_ENUMERROR_NoError)
				{
					puts_P(PSTR("Attached Device Not a Valid Mouse.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				if (USB_Host_SetDeviceConfiguration(1) != HOST_SENDCONTROL_Successful)
				{
					puts_P(PSTR("Error Setting Device Configuration.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				if (HID_Host_SetReportProtocol(&Mouse_HID_Interface) != 0)
				{
					puts_P(PSTR("Error Setting Report Protocol Mode or Not a Valid Mouse.\r\n"));
					LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
					USB_HostState = HOST_STATE_WaitForDeviceRemoval;
					break;
				}

				puts_P(PSTR("Mouse Enumerated.\r\n"));
				LEDs_SetAllLEDs(LEDMASK_USB_READY);
				USB_HostState = HOST_STATE_Configured;
				break;
			case HOST_STATE_Configured:
				if (HID_Host_IsReportReceived(&Mouse_HID_Interface))
				{
					uint8_t MouseReport[Mouse_HID_Interface.State.LargestReportSize];
					HID_Host_ReceiveReport(&Mouse_HID_Interface, &MouseReport);

					uint8_t LEDMask = LEDS_NO_LEDS;

					for (uint8_t ReportNumber = 0; ReportNumber < HIDReportInfo.TotalReportItems; ReportNumber++)
					{
						HID_ReportItem_t* ReportItem = &HIDReportInfo.ReportItems[ReportNumber];

						/* Update the report item value if it is contained within the current report */
						if (!(USB_GetHIDReportItemInfo(MouseReport, ReportItem)))
						  continue;

						/* Determine what report item is being tested, process updated value as needed */
						if ((ReportItem->Attributes.Usage.Page        == USAGE_PAGE_BUTTON) &&
							(ReportItem->ItemType                     == HID_REPORT_ITEM_In))
						{
							if (ReportItem->Value)
							  LEDMask = LEDS_ALL_LEDS;
						}
						else if ((ReportItem->Attributes.Usage.Page   == USAGE_PAGE_GENERIC_DCTRL) &&
								 (ReportItem->Attributes.Usage.Usage  == USAGE_SCROLL_WHEEL)       &&
								 (ReportItem->ItemType                == HID_REPORT_ITEM_In))
						{
							int16_t WheelDelta = HID_ALIGN_DATA(ReportItem, int16_t);

							if (WheelDelta)
							  LEDMask = (LEDS_LED1 | LEDS_LED2 | ((WheelDelta > 0) ? LEDS_LED3 : LEDS_LED4));
						}
						else if ((ReportItem->Attributes.Usage.Page   == USAGE_PAGE_GENERIC_DCTRL) &&
								 ((ReportItem->Attributes.Usage.Usage == USAGE_X)                  ||
								  (ReportItem->Attributes.Usage.Usage == USAGE_Y))                 &&
								 (ReportItem->ItemType                == HID_REPORT_ITEM_In))
						{
							int16_t DeltaMovement = HID_ALIGN_DATA(ReportItem, int16_t);

							if (DeltaMovement)
//.........这里部分代码省略.........

/** Task to handle the generation of MIDI note change events in response to presses of the board joystick, and send them
 *  to the host.
 */
void MIDI_Task(void)
{
    static uint8_t PrevJoystickStatus;

    /* Device must be connected and configured for the task to run */
    if (USB_DeviceState != DEVICE_STATE_Configured)
        return;

    Endpoint_SelectEndpoint(MIDI_STREAM_IN_EPADDR);

    if (Endpoint_IsINReady())
    {
        uint8_t MIDICommand = 0;
        uint8_t MIDIPitch;

        uint8_t JoystickStatus  = Joystick_GetStatus();
        uint8_t JoystickChanges = (JoystickStatus ^ PrevJoystickStatus);

        /* Get board button status - if pressed use channel 10 (percussion), otherwise use channel 1 */
        uint8_t Channel = ((Buttons_GetStatus() & BUTTONS_BUTTON1) ? MIDI_CHANNEL(10) : MIDI_CHANNEL(1));

        if (JoystickChanges & JOY_LEFT)
        {
            MIDICommand = ((JoystickStatus & JOY_LEFT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
            MIDIPitch   = 0x3C;
        }

        if (JoystickChanges & JOY_UP)
        {
            MIDICommand = ((JoystickStatus & JOY_UP)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
            MIDIPitch   = 0x3D;
        }

        if (JoystickChanges & JOY_RIGHT)
        {
            MIDICommand = ((JoystickStatus & JOY_RIGHT)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
            MIDIPitch   = 0x3E;
        }

        if (JoystickChanges & JOY_DOWN)
        {
            MIDICommand = ((JoystickStatus & JOY_DOWN)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
            MIDIPitch   = 0x3F;
        }

        if (JoystickChanges & JOY_PRESS)
        {
            MIDICommand = ((JoystickStatus & JOY_PRESS)? MIDI_COMMAND_NOTE_ON : MIDI_COMMAND_NOTE_OFF);
            MIDIPitch   = 0x3B;
        }

        /* Check if a MIDI command is to be sent */
        if (MIDICommand)
        {
            MIDI_EventPacket_t MIDIEvent = (MIDI_EventPacket_t)
            {
                .Event       = MIDI_EVENT(0, MIDICommand),

                 .Data1       = MIDICommand | Channel,
                  .Data2       = MIDIPitch,
                   .Data3       = MIDI_STANDARD_VELOCITY,
            };

            /* Write the MIDI event packet to the endpoint */
            Endpoint_Write_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);

            /* Send the data in the endpoint to the host */
            Endpoint_ClearIN();
        }

        /* Save previous joystick value for next joystick change detection */
        PrevJoystickStatus = JoystickStatus;
    }

    /* Select the MIDI OUT stream */
    Endpoint_SelectEndpoint(MIDI_STREAM_OUT_EPADDR);

    /* Check if a MIDI command has been received */
    if (Endpoint_IsOUTReceived())
    {
        MIDI_EventPacket_t MIDIEvent;

        /* Read the MIDI event packet from the endpoint */
        Endpoint_Read_Stream_LE(&MIDIEvent, sizeof(MIDIEvent), NULL);

        /* Check to see if the sent command is a note on message with a non-zero velocity */
        if ((MIDIEvent.Event == MIDI_EVENT(0, MIDI_COMMAND_NOTE_ON)) && (MIDIEvent.Data3 > 0))
        {
            /* Change LEDs depending on the pitch of the sent note */
            LEDs_SetAllLEDs(MIDIEvent.Data2 > 64 ? LEDS_LED1 : LEDS_LED2);
        }
        else
        {
            /* Turn off all LEDs in response to non Note On messages */
            LEDs_SetAllLEDs(LEDS_NO_LEDS);
        }

//.........这里部分代码省略.........

/** Event handler for the USB_DeviceEnumerationFailed event. This indicates that a problem occurred while
 *  enumerating an attached USB device.
 */
void EVENT_USB_Host_DeviceEnumerationFailed(const uint8_t ErrorCode,
                                            const uint8_t SubErrorCode)
{
	LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
}

/** Main program entry point. This routine contains the overall program flow, including initial
 *  setup of all components and the main program loop.
 */
int main(void)
{
    MIDI_EventPacket_t midiEvent;
    struct {
	uint8_t command;
	uint8_t channel;
	uint8_t data2;
	uint8_t data3;
    } midiMsg;
    int ind;

    int led1_ticks = 0;
    int led2_ticks = 0;

    SetupHardware();

    RingBuffer_InitBuffer(&USBtoUSART_Buffer);
    RingBuffer_InitBuffer(&USARTtoUSB_Buffer);

    LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
    sei();

    for (;;) {
	RingBuff_Count_t BufferCount = RingBuffer_GetCount(&USARTtoUSB_Buffer);

	/* See if we have a message yet */
	if (BufferCount >= 4) {
	    /* Read in the message from the serial buffer */
	    for (ind=0; ind<4; ind++) {
		((uint8_t *)&midiMsg)[ind] = RingBuffer_Remove(&USARTtoUSB_Buffer);
	    }

	    /* Build a midi event to send via USB */
	    midiEvent.CableNumber = 0;
	    midiEvent.Command = midiMsg.command >> 4;
	    midiEvent.Data1 = (midiMsg.command & 0xF0) | ((midiMsg.channel-1) & 0x0F);
	    midiEvent.Data2 = midiMsg.data2;
	    midiEvent.Data3 = midiMsg.data3;

	    MIDI_Device_SendEventPacket(&Keyboard_MIDI_Interface, &midiEvent);
	    MIDI_Device_Flush(&Keyboard_MIDI_Interface);

	    /* Turn on the TX led and starts its timer */
	    LEDs_TurnOnLEDs(LEDS_LED1);
	    led1_ticks = LED_ON_TICKS;
	}
	
	/* Turn off the Tx LED when the tick count reaches zero */
	if (led1_ticks) {
	    led1_ticks--;
	    if (led1_ticks == 0) {
		LEDs_TurnOffLEDs(LEDS_LED1);
	    }
	}

	if (MIDI_Device_ReceiveEventPacket(&Keyboard_MIDI_Interface, &midiEvent)) {
	    RingBuff_Count_t count = RingBuffer_GetCount(&USBtoUSART_Buffer);
	    /* Room to send a message? */
	    if ((BUFFER_SIZE - count) >= sizeof(midiMsg)) {
		midiMsg.command = midiEvent.Command << 4;
		midiMsg.channel = (midiEvent.Data1 & 0x0F) + 1;
		midiMsg.data2 = midiEvent.Data2;
		midiMsg.data3 = midiEvent.Data3;

		for (ind=0; ind<sizeof(midiMsg); ind++) {
		    RingBuffer_Insert(&USBtoUSART_Buffer, ((uint8_t *)&midiMsg)[ind]);
		}

		/* Turn on the RX led and start its timer */
		LEDs_TurnOnLEDs(LEDS_LED2);
		led2_ticks = LED_ON_TICKS;
	    } else {
		/* Turn on the RX led and leave it on to indicate the
		 * buffer is full and the sketch is not reading it 
		 * fast enough.
		 */
		LEDs_TurnOnLEDs(LEDS_LED2);
	    }

	    /* if there's no room in the serial buffer the message gets dropped */
	}

	/* Turn off the RX LED when the tick count reaches zero */
	if (led2_ticks) {
	    led2_ticks--;
	    if (led2_ticks == 0) {
		LEDs_TurnOffLEDs(LEDS_LED2);
	    }
	}

	/* any data to send to main processor? */
	if (!(RingBuffer_IsEmpty(&USBtoUSART_Buffer))) {
	    Serial_TxByte(RingBuffer_Remove(&USBtoUSART_Buffer));
	}

	MIDI_Device_USBTask(&Keyboard_MIDI_Interface);
	USB_USBTask();
//.........这里部分代码省略.........

/** Event handler for the USB_DeviceEnumerationComplete event. This indicates that a device has been successfully
 *  enumerated by the host and is now ready to be used by the application.
 */
void EVENT_USB_Host_DeviceEnumerationComplete(void)
{
	puts_P(PSTR("Getting Config Data.\r\n"));

	uint8_t ErrorCode;

	/* Get and process the configuration descriptor data */
	if ((ErrorCode = ProcessConfigurationDescriptor()) != SuccessfulConfigRead)
	{
		if (ErrorCode == ControlError)
		  puts_P(PSTR(ESC_FG_RED "Control Error (Get Configuration).\r\n"));
		else
		  puts_P(PSTR(ESC_FG_RED "Invalid Device.\r\n"));

		printf_P(PSTR(" -- Error Code: %d\r\n"), ErrorCode);

		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
		return;
	}

	/* Set the device configuration to the first configuration (rarely do devices use multiple configurations) */
	if ((ErrorCode = USB_Host_SetDeviceConfiguration(1)) != HOST_SENDCONTROL_Successful)
	{
		printf_P(PSTR(ESC_FG_RED "Control Error (Set Configuration).\r\n"
		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
		return;
	}

	/* Some printers use alternate settings to determine the communication protocol used - if so, send a SetInterface
	 * request to switch to the interface alternate setting with the Bidirectional protocol */
	if (PrinterAltSetting)
	{
		if ((ErrorCode = USB_Host_SetInterfaceAltSetting(PrinterInterfaceNumber, PrinterAltSetting)) != HOST_SENDCONTROL_Successful)
		{
			printf_P(PSTR(ESC_FG_RED "Control Error (Set Interface).\r\n"
			                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

			LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
			USB_Host_SetDeviceConfiguration(0);
			return;
		}
	}

	puts_P(PSTR("Retrieving Device ID...\r\n"));

	char DeviceIDString[300];
	if ((ErrorCode = Printer_GetDeviceID(DeviceIDString, sizeof(DeviceIDString))) != HOST_SENDCONTROL_Successful)
	{
		printf_P(PSTR(ESC_FG_RED "Control Error (Get Device ID).\r\n"
		                         " -- Error Code: %d\r\n" ESC_FG_WHITE), ErrorCode);

		LEDs_SetAllLEDs(LEDMASK_USB_ERROR);
		USB_Host_SetDeviceConfiguration(0);
		return;
	}

	printf_P(PSTR("Printer Device ID: %s\r\n"), DeviceIDString);

	puts_P(PSTR("Printer Enumerated.\r\n"));
	LEDs_SetAllLEDs(LEDMASK_USB_READY);
}