Fix the LUFA lib to use a submodule instead of just files (#6245)

* Remove LUFA files

* Update descriptions for newer version of LUFA

* Create PR6245.md

* Fix CDC(Serial) type errors

* Fix missed merge conflict for AUDIO_DTYPE_CSInterface

1 files changed, 0 insertions, 673 deletions

diff --git a/lib/lufa/Bootloaders/CDC/BootloaderCDC.c b/lib/lufa/Bootloaders/CDC/BootloaderCDC.c
deleted file mode 100644
index aa17bc15b..000000000
--- a/lib/lufa/Bootloaders/CDC/BootloaderCDC.c
+++ /dev/null
@@ -1,673 +0,0 @@
-/*
-             LUFA Library
-     Copyright (C) Dean Camera, 2017.
-
-  dean [at] fourwalledcubicle [dot] com
-           www.lufa-lib.org
-*/
-
-/*
-  Copyright 2017  Dean Camera (dean [at] fourwalledcubicle [dot] com)
-
-  Permission to use, copy, modify, distribute, and sell this
-  software and its documentation for any purpose is hereby granted
-  without fee, provided that the above copyright notice appear in
-  all copies and that both that the copyright notice and this
-  permission notice and warranty disclaimer appear in supporting
-  documentation, and that the name of the author not be used in
-  advertising or publicity pertaining to distribution of the
-  software without specific, written prior permission.
-
-  The author disclaims all warranties with regard to this
-  software, including all implied warranties of merchantability
-  and fitness.  In no event shall the author be liable for any
-  special, indirect or consequential damages or any damages
-  whatsoever resulting from loss of use, data or profits, whether
-  in an action of contract, negligence or other tortious action,
-  arising out of or in connection with the use or performance of
-  this software.
-*/
-
-/** \file
- *
- *  Main source file for the CDC class bootloader. This file contains the complete bootloader logic.
- */
-
-#define  INCLUDE_FROM_BOOTLOADERCDC_C
-#include "BootloaderCDC.h"
-
-/** Contains the current baud rate and other settings of the first virtual serial port. This must be retained as some
- *  operating systems will not open the port unless the settings can be set successfully.
- */
-static CDC_LineEncoding_t LineEncoding = { .BaudRateBPS = 0,
-                                           .CharFormat  = CDC_LINEENCODING_OneStopBit,
-                                           .ParityType  = CDC_PARITY_None,
-                                           .DataBits    = 8                            };
-
-/** Current address counter. This stores the current address of the FLASH or EEPROM as set by the host,
- *  and is used when reading or writing to the AVRs memory (either FLASH or EEPROM depending on the issued
- *  command.)
- */
-static uint32_t CurrAddress;
-
-/** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
- *  via a watchdog reset. When cleared the bootloader will exit, starting the watchdog and entering an infinite
- *  loop until the AVR restarts and the application runs.
- */
-static bool RunBootloader = true;
-
-/** Magic lock for forced application start. If the HWBE fuse is programmed and BOOTRST is unprogrammed, the bootloader
- *  will start if the /HWB line of the AVR is held low and the system is reset. However, if the /HWB line is still held
- *  low when the application attempts to start via a watchdog reset, the bootloader will re-start. If set to the value
- *  \ref MAGIC_BOOT_KEY the special init function \ref Application_Jump_Check() will force the application to start.
- */
-uint16_t MagicBootKey ATTR_NO_INIT;
-
-
-/** Special startup routine to check if the bootloader was started via a watchdog reset, and if the magic application
- *  start key has been loaded into \ref MagicBootKey. If the bootloader started via the watchdog and the key is valid,
- *  this will force the user application to start via a software jump.
- */
-void Application_Jump_Check(void)
-{
-	bool JumpToApplication = false;
-
-	#if (BOARD == BOARD_LEONARDO)
-		/* Enable pull-up on the IO13 pin so we can use it to select the mode */
-		PORTC |= (1 << 7);
-		Delay_MS(10);
-
-		/* If IO13 is not jumpered to ground, start the user application instead */
-		JumpToApplication = ((PINC & (1 << 7)) != 0);
-
-		/* Disable pull-up after the check has completed */
-		PORTC &= ~(1 << 7);
-	#elif ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
-		/* Disable JTAG debugging */
-		JTAG_DISABLE();
-
-		/* Enable pull-up on the JTAG TCK pin so we can use it to select the mode */
-		PORTF |= (1 << 4);
-		Delay_MS(10);
-
-		/* If the TCK pin is not jumpered to ground, start the user application instead */
-		JumpToApplication = ((PINF & (1 << 4)) != 0);
-
-		/* Re-enable JTAG debugging */
-		JTAG_ENABLE();
-	#else
-		/* Check if the device's BOOTRST fuse is set */
-		if (boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS) & FUSE_BOOTRST)
-		{
-			/* If the reset source was not an external reset or the key is correct, clear it and jump to the application */
-			if (!(MCUSR & (1 << EXTRF)) || (MagicBootKey == MAGIC_BOOT_KEY))
-			  JumpToApplication = true;
-
-			/* Clear reset source */
-			MCUSR &= ~(1 << EXTRF);
-		}
-		else
-		{
-			/* If the reset source was the bootloader and the key is correct, clear it and jump to the application;
-			 * this can happen in the HWBE fuse is set, and the HBE pin is low during the watchdog reset */
-			if ((MCUSR & (1 << WDRF)) && (MagicBootKey == MAGIC_BOOT_KEY))
-				JumpToApplication = true;
-
-			/* Clear reset source */
-			MCUSR &= ~(1 << WDRF);
-		}
-	#endif
-
-	/* Don't run the user application if the reset vector is blank (no app loaded) */
-	bool ApplicationValid = (pgm_read_word_near(0) != 0xFFFF);
-
-	/* If a request has been made to jump to the user application, honor it */
-	if (JumpToApplication && ApplicationValid)
-	{
-		/* Turn off the watchdog */
-		MCUSR &= ~(1 << WDRF);
-		wdt_disable();
-
-		/* Clear the boot key and jump to the user application */
-		MagicBootKey = 0;
-
-		// cppcheck-suppress constStatement
-		((void (*)(void))0x0000)();
-	}
-}
-
-/** Main program entry point. This routine configures the hardware required by the bootloader, then continuously
- *  runs the bootloader processing routine until instructed to soft-exit, or hard-reset via the watchdog to start
- *  the loaded application code.
- */
-int main(void)
-{
-	/* Setup hardware required for the bootloader */
-	SetupHardware();
-
-	/* Turn on first LED on the board to indicate that the bootloader has started */
-	LEDs_SetAllLEDs(LEDS_LED1);
-
-	/* Enable global interrupts so that the USB stack can function */
-	GlobalInterruptEnable();
-
-	while (RunBootloader)
-	{
-		CDC_Task();
-		USB_USBTask();
-	}
-
-	/* Wait a short time to end all USB transactions and then disconnect */
-	_delay_us(1000);
-
-	/* Disconnect from the host - USB interface will be reset later along with the AVR */
-	USB_Detach();
-
-	/* Unlock the forced application start mode of the bootloader if it is restarted */
-	MagicBootKey = MAGIC_BOOT_KEY;
-
-	/* Enable the watchdog and force a timeout to reset the AVR */
-	wdt_enable(WDTO_250MS);
-
-	for (;;);
-}
-
-/** Configures all hardware required for the bootloader. */
-static void SetupHardware(void)
-{
-	/* Disable watchdog if enabled by bootloader/fuses */
-	MCUSR &= ~(1 << WDRF);
-	wdt_disable();
-
-	/* Disable clock division */
-	clock_prescale_set(clock_div_1);
-
-	/* Relocate the interrupt vector table to the bootloader section */
-	MCUCR = (1 << IVCE);
-	MCUCR = (1 << IVSEL);
-
-	/* Initialize the USB and other board hardware drivers */
-	USB_Init();
-	LEDs_Init();
-
-	/* Bootloader active LED toggle timer initialization */
-	TIMSK1 = (1 << TOIE1);
-	TCCR1B = ((1 << CS11) | (1 << CS10));
-}
-
-/** ISR to periodically toggle the LEDs on the board to indicate that the bootloader is active. */
-ISR(TIMER1_OVF_vect, ISR_BLOCK)
-{
-	LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2);
-}
-
-/** Event handler for the USB_ConfigurationChanged event. This configures the device's endpoints ready
- *  to relay data to and from the attached USB host.
- */
-void EVENT_USB_Device_ConfigurationChanged(void)
-{
-	/* Setup CDC Notification, Rx and Tx Endpoints */
-	Endpoint_ConfigureEndpoint(CDC_NOTIFICATION_EPADDR, EP_TYPE_INTERRUPT,
-	                           CDC_NOTIFICATION_EPSIZE, 1);
-
-	Endpoint_ConfigureEndpoint(CDC_TX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
-
-	Endpoint_ConfigureEndpoint(CDC_RX_EPADDR, EP_TYPE_BULK, CDC_TXRX_EPSIZE, 1);
-}
-
-/** Event handler for the USB_ControlRequest event. This is used to catch and process control requests sent to
- *  the device from the USB host before passing along unhandled control requests to the library for processing
- *  internally.
- */
-void EVENT_USB_Device_ControlRequest(void)
-{
-	/* Ignore any requests that aren't directed to the CDC interface */
-	if ((USB_ControlRequest.bmRequestType & (CONTROL_REQTYPE_TYPE | CONTROL_REQTYPE_RECIPIENT)) !=
-	    (REQTYPE_CLASS | REQREC_INTERFACE))
-	{
-		return;
-	}
-
-	/* Activity - toggle indicator LEDs */
-	LEDs_ToggleLEDs(LEDS_LED1 | LEDS_LED2);
-
-	/* Process CDC specific control requests */
-	switch (USB_ControlRequest.bRequest)
-	{
-		case CDC_REQ_GetLineEncoding:
-			if (USB_ControlRequest.bmRequestType == (REQDIR_DEVICETOHOST | REQTYPE_CLASS | REQREC_INTERFACE))
-			{
-				Endpoint_ClearSETUP();
-
-				/* Write the line coding data to the control endpoint */
-				Endpoint_Write_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t));
-				Endpoint_ClearOUT();
-			}
-
-			break;
-		case CDC_REQ_SetLineEncoding:
-			if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
-			{
-				Endpoint_ClearSETUP();
-
-				/* Read the line coding data in from the host into the global struct */
-				Endpoint_Read_Control_Stream_LE(&LineEncoding, sizeof(CDC_LineEncoding_t));
-				Endpoint_ClearIN();
-			}
-
-			break;
-        case CDC_REQ_SetControlLineState:
-	        if (USB_ControlRequest.bmRequestType == (REQDIR_HOSTTODEVICE | REQTYPE_CLASS | REQREC_INTERFACE))
-	        {
-	            Endpoint_ClearSETUP();
-	            Endpoint_ClearStatusStage();
-	        }
-
-	        break;
-	}
-}
-
-#if !defined(NO_BLOCK_SUPPORT)
-/** Reads or writes a block of EEPROM or FLASH memory to or from the appropriate CDC data endpoint, depending
- *  on the AVR109 protocol command issued.
- *
- *  \param[in] Command  Single character AVR109 protocol command indicating what memory operation to perform
- */
-static void ReadWriteMemoryBlock(const uint8_t Command)
-{
-	uint16_t BlockSize;
-	char     MemoryType;
-
-	uint8_t  HighByte = 0;
-	uint8_t  LowByte  = 0;
-
-	BlockSize  = (FetchNextCommandByte() << 8);
-	BlockSize |=  FetchNextCommandByte();
-
-	MemoryType =  FetchNextCommandByte();
-
-	if ((MemoryType != MEMORY_TYPE_FLASH) && (MemoryType != MEMORY_TYPE_EEPROM))
-	{
-		/* Send error byte back to the host */
-		WriteNextResponseByte('?');
-
-		return;
-	}
-
-	/* Check if command is to read a memory block */
-	if (Command == AVR109_COMMAND_BlockRead)
-	{
-		/* Re-enable RWW section */
-		boot_rww_enable();
-
-		while (BlockSize--)
-		{
-			if (MemoryType == MEMORY_TYPE_FLASH)
-			{
-				/* Read the next FLASH byte from the current FLASH page */
-				#if (FLASHEND > 0xFFFF)
-				WriteNextResponseByte(pgm_read_byte_far(CurrAddress | HighByte));
-				#else
-				WriteNextResponseByte(pgm_read_byte(CurrAddress | HighByte));
-				#endif
-
-				/* If both bytes in current word have been read, increment the address counter */
-				if (HighByte)
-				  CurrAddress += 2;
-
-				HighByte = !HighByte;
-			}
-			else
-			{
-				/* Read the next EEPROM byte into the endpoint */
-				WriteNextResponseByte(eeprom_read_byte((uint8_t*)(intptr_t)(CurrAddress >> 1)));
-
-				/* Increment the address counter after use */
-				CurrAddress += 2;
-			}
-		}
-	}
-	else
-	{
-		uint32_t PageStartAddress = CurrAddress;
-
-		if (MemoryType == MEMORY_TYPE_FLASH)
-		{
-			boot_page_erase(PageStartAddress);
-			boot_spm_busy_wait();
-		}
-
-		while (BlockSize--)
-		{
-			if (MemoryType == MEMORY_TYPE_FLASH)
-			{
-				/* If both bytes in current word have been written, increment the address counter */
-				if (HighByte)
-				{
-					/* Write the next FLASH word to the current FLASH page */
-					boot_page_fill(CurrAddress, ((FetchNextCommandByte() << 8) | LowByte));
-
-					/* Increment the address counter after use */
-					CurrAddress += 2;
-				}
-				else
-				{
-					LowByte = FetchNextCommandByte();
-				}
-
-				HighByte = !HighByte;
-			}
-			else
-			{
-				/* Write the next EEPROM byte from the endpoint */
-				eeprom_update_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte());
-
-				/* Increment the address counter after use */
-				CurrAddress += 2;
-			}
-		}
-
-		/* If in FLASH programming mode, commit the page after writing */
-		if (MemoryType == MEMORY_TYPE_FLASH)
-		{
-			/* Commit the flash page to memory */
-			boot_page_write(PageStartAddress);
-
-			/* Wait until write operation has completed */
-			boot_spm_busy_wait();
-		}
-
-		/* Send response byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-}
-#endif
-
-/** Retrieves the next byte from the host in the CDC data OUT endpoint, and clears the endpoint bank if needed
- *  to allow reception of the next data packet from the host.
- *
- *  \return Next received byte from the host in the CDC data OUT endpoint
- */
-static uint8_t FetchNextCommandByte(void)
-{
-	/* Select the OUT endpoint so that the next data byte can be read */
-	Endpoint_SelectEndpoint(CDC_RX_EPADDR);
-
-	/* If OUT endpoint empty, clear it and wait for the next packet from the host */
-	while (!(Endpoint_IsReadWriteAllowed()))
-	{
-		Endpoint_ClearOUT();
-
-		while (!(Endpoint_IsOUTReceived()))
-		{
-			if (USB_DeviceState == DEVICE_STATE_Unattached)
-			  return 0;
-		}
-	}
-
-	/* Fetch the next byte from the OUT endpoint */
-	return Endpoint_Read_8();
-}
-
-/** Writes the next response byte to the CDC data IN endpoint, and sends the endpoint back if needed to free up the
- *  bank when full ready for the next byte in the packet to the host.
- *
- *  \param[in] Response  Next response byte to send to the host
- */
-static void WriteNextResponseByte(const uint8_t Response)
-{
-	/* Select the IN endpoint so that the next data byte can be written */
-	Endpoint_SelectEndpoint(CDC_TX_EPADDR);
-
-	/* If IN endpoint full, clear it and wait until ready for the next packet to the host */
-	if (!(Endpoint_IsReadWriteAllowed()))
-	{
-		Endpoint_ClearIN();
-
-		while (!(Endpoint_IsINReady()))
-		{
-			if (USB_DeviceState == DEVICE_STATE_Unattached)
-			  return;
-		}
-	}
-
-	/* Write the next byte to the IN endpoint */
-	Endpoint_Write_8(Response);
-}
-
-/** Task to read in AVR109 commands from the CDC data OUT endpoint, process them, perform the required actions
- *  and send the appropriate response back to the host.
- */
-static void CDC_Task(void)
-{
-	/* Select the OUT endpoint */
-	Endpoint_SelectEndpoint(CDC_RX_EPADDR);
-
-	/* Check if endpoint has a command in it sent from the host */
-	if (!(Endpoint_IsOUTReceived()))
-	  return;
-
-	/* Read in the bootloader command (first byte sent from host) */
-	uint8_t Command = FetchNextCommandByte();
-
-	if (Command == AVR109_COMMAND_ExitBootloader)
-	{
-		RunBootloader = false;
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if ((Command == AVR109_COMMAND_SetLED) || (Command == AVR109_COMMAND_ClearLED) ||
-	         (Command == AVR109_COMMAND_SelectDeviceType))
-	{
-		FetchNextCommandByte();
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if ((Command == AVR109_COMMAND_EnterProgrammingMode) || (Command == AVR109_COMMAND_LeaveProgrammingMode))
-	{
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if (Command == AVR109_COMMAND_ReadPartCode)
-	{
-		/* Return ATMEGA128 part code - this is only to allow AVRProg to use the bootloader */
-		WriteNextResponseByte(0x44);
-		WriteNextResponseByte(0x00);
-	}
-	else if (Command == AVR109_COMMAND_ReadAutoAddressIncrement)
-	{
-		/* Indicate auto-address increment is supported */
-		WriteNextResponseByte('Y');
-	}
-	else if (Command == AVR109_COMMAND_SetCurrentAddress)
-	{
-		/* Set the current address to that given by the host (translate 16-bit word address to byte address) */
-		CurrAddress   = (FetchNextCommandByte() << 9);
-		CurrAddress  |= (FetchNextCommandByte() << 1);
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if (Command == AVR109_COMMAND_ReadBootloaderInterface)
-	{
-		/* Indicate serial programmer back to the host */
-		WriteNextResponseByte('S');
-	}
-	else if (Command == AVR109_COMMAND_ReadBootloaderIdentifier)
-	{
-		/* Write the 7-byte software identifier to the endpoint */
-		for (uint8_t CurrByte = 0; CurrByte < 7; CurrByte++)
-		  WriteNextResponseByte(SOFTWARE_IDENTIFIER[CurrByte]);
-	}
-	else if (Command == AVR109_COMMAND_ReadBootloaderSWVersion)
-	{
-		WriteNextResponseByte('0' + BOOTLOADER_VERSION_MAJOR);
-		WriteNextResponseByte('0' + BOOTLOADER_VERSION_MINOR);
-	}
-	else if (Command == AVR109_COMMAND_ReadSignature)
-	{
-		WriteNextResponseByte(AVR_SIGNATURE_3);
-		WriteNextResponseByte(AVR_SIGNATURE_2);
-		WriteNextResponseByte(AVR_SIGNATURE_1);
-	}
-	else if (Command == AVR109_COMMAND_EraseFLASH)
-	{
-		/* Clear the application section of flash */
-		for (uint32_t CurrFlashAddress = 0; CurrFlashAddress < (uint32_t)BOOT_START_ADDR; CurrFlashAddress += SPM_PAGESIZE)
-		{
-			boot_page_erase(CurrFlashAddress);
-			boot_spm_busy_wait();
-			boot_page_write(CurrFlashAddress);
-			boot_spm_busy_wait();
-		}
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	#if !defined(NO_LOCK_BYTE_WRITE_SUPPORT)
-	else if (Command == AVR109_COMMAND_WriteLockbits)
-	{
-		/* Set the lock bits to those given by the host */
-		boot_lock_bits_set(FetchNextCommandByte());
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	#endif
-	else if (Command == AVR109_COMMAND_ReadLockbits)
-	{
-		WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOCK_BITS));
-	}
-	else if (Command == AVR109_COMMAND_ReadLowFuses)
-	{
-		WriteNextResponseByte(boot_lock_fuse_bits_get(GET_LOW_FUSE_BITS));
-	}
-	else if (Command == AVR109_COMMAND_ReadHighFuses)
-	{
-		WriteNextResponseByte(boot_lock_fuse_bits_get(GET_HIGH_FUSE_BITS));
-	}
-	else if (Command == AVR109_COMMAND_ReadExtendedFuses)
-	{
-		WriteNextResponseByte(boot_lock_fuse_bits_get(GET_EXTENDED_FUSE_BITS));
-	}
-	#if !defined(NO_BLOCK_SUPPORT)
-	else if (Command == AVR109_COMMAND_GetBlockWriteSupport)
-	{
-		WriteNextResponseByte('Y');
-
-		/* Send block size to the host */
-		WriteNextResponseByte(SPM_PAGESIZE >> 8);
-		WriteNextResponseByte(SPM_PAGESIZE & 0xFF);
-	}
-	else if ((Command == AVR109_COMMAND_BlockWrite) || (Command == AVR109_COMMAND_BlockRead))
-	{
-		/* Delegate the block write/read to a separate function for clarity */
-		ReadWriteMemoryBlock(Command);
-	}
-	#endif
-	#if !defined(NO_FLASH_BYTE_SUPPORT)
-	else if (Command == AVR109_COMMAND_FillFlashPageWordHigh)
-	{
-		/* Write the high byte to the current flash page */
-		boot_page_fill(CurrAddress, FetchNextCommandByte());
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if (Command == AVR109_COMMAND_FillFlashPageWordLow)
-	{
-		/* Write the low byte to the current flash page */
-		boot_page_fill(CurrAddress | 0x01, FetchNextCommandByte());
-
-		/* Increment the address */
-		CurrAddress += 2;
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if (Command == AVR109_COMMAND_WriteFlashPage)
-	{
-		/* Commit the flash page to memory */
-		boot_page_write(CurrAddress);
-
-		/* Wait until write operation has completed */
-		boot_spm_busy_wait();
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if (Command == AVR109_COMMAND_ReadFLASHWord)
-	{
-		#if (FLASHEND > 0xFFFF)
-		uint16_t ProgramWord = pgm_read_word_far(CurrAddress);
-		#else
-		uint16_t ProgramWord = pgm_read_word(CurrAddress);
-		#endif
-
-		WriteNextResponseByte(ProgramWord >> 8);
-		WriteNextResponseByte(ProgramWord & 0xFF);
-	}
-	#endif
-	#if !defined(NO_EEPROM_BYTE_SUPPORT)
-	else if (Command == AVR109_COMMAND_WriteEEPROM)
-	{
-		/* Read the byte from the endpoint and write it to the EEPROM */
-		eeprom_update_byte((uint8_t*)((intptr_t)(CurrAddress >> 1)), FetchNextCommandByte());
-
-		/* Increment the address after use */
-		CurrAddress += 2;
-
-		/* Send confirmation byte back to the host */
-		WriteNextResponseByte('\r');
-	}
-	else if (Command == AVR109_COMMAND_ReadEEPROM)
-	{
-		/* Read the EEPROM byte and write it to the endpoint */
-		WriteNextResponseByte(eeprom_read_byte((uint8_t*)((intptr_t)(CurrAddress >> 1))));
-
-		/* Increment the address after use */
-		CurrAddress += 2;
-	}
-	#endif
-	else if (Command != AVR109_COMMAND_Sync)
-	{
-		/* Unknown (non-sync) command, return fail code */
-		WriteNextResponseByte('?');
-	}
-
-	/* Select the IN endpoint */
-	Endpoint_SelectEndpoint(CDC_TX_EPADDR);
-
-	/* Remember if the endpoint is completely full before clearing it */
-	bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
-
-	/* Send the endpoint data to the host */
-	Endpoint_ClearIN();
-
-	/* If a full endpoint's worth of data was sent, we need to send an empty packet afterwards to signal end of transfer */
-	if (IsEndpointFull)
-	{
-		while (!(Endpoint_IsINReady()))
-		{
-			if (USB_DeviceState == DEVICE_STATE_Unattached)
-			  return;
-		}
-
-		Endpoint_ClearIN();
-	}
-
-	/* Wait until the data has been sent to the host */
-	while (!(Endpoint_IsINReady()))
-	{
-		if (USB_DeviceState == DEVICE_STATE_Unattached)
-		  return;
-	}
-
-	/* Select the OUT endpoint */
-	Endpoint_SelectEndpoint(CDC_RX_EPADDR);
-
-	/* Acknowledge the command from the host */
-	Endpoint_ClearOUT();
-}