12 files changed, 4019 insertions, 0 deletions
diff --git a/Bootloaders/Printer/BootloaderAPI.c b/Bootloaders/Printer/BootloaderAPI.c
new file mode 100644
index 0000000000..2be1568082
--- /dev/null
+++ b/Bootloaders/Printer/BootloaderAPI.c
@@ -0,0 +1,75 @@
+/*
+             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
+ *
+ *  Bootloader user application API functions.
+ */
+
+#include "BootloaderAPI.h"
+
+void BootloaderAPI_ErasePage(const uint32_t Address)
+{
+	boot_page_erase_safe(Address);
+	boot_spm_busy_wait();
+	boot_rww_enable();
+}
+
+void BootloaderAPI_WritePage(const uint32_t Address)
+{
+	boot_page_write_safe(Address);
+	boot_spm_busy_wait();
+	boot_rww_enable();
+}
+
+void BootloaderAPI_FillWord(const uint32_t Address, const uint16_t Word)
+{
+	boot_page_fill_safe(Address, Word);
+}
+
+uint8_t BootloaderAPI_ReadSignature(const uint16_t Address)
+{
+	return boot_signature_byte_get(Address);
+}
+
+uint8_t BootloaderAPI_ReadFuse(const uint16_t Address)
+{
+	return boot_lock_fuse_bits_get(Address);
+}
+
+uint8_t BootloaderAPI_ReadLock(void)
+{
+	return boot_lock_fuse_bits_get(GET_LOCK_BITS);
+}
+
+void BootloaderAPI_WriteLock(const uint8_t LockBits)
+{
+	boot_lock_bits_set_safe(LockBits);
+}
diff --git a/Bootloaders/Printer/BootloaderAPI.h b/Bootloaders/Printer/BootloaderAPI.h
new file mode 100644
index 0000000000..c2d9b4a188
--- /dev/null
+++ b/Bootloaders/Printer/BootloaderAPI.h
@@ -0,0 +1,56 @@
+/*
+             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
+ *
+ *  Header file for BootloaderAPI.c.
+ */
+
+#ifndef _BOOTLOADER_API_H_
+#define _BOOTLOADER_API_H_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/boot.h>
+		#include <stdbool.h>
+
+		#include <LUFA/Common/Common.h>
+
+	/* Function Prototypes: */
+		void    BootloaderAPI_ErasePage(const uint32_t Address);
+		void    BootloaderAPI_WritePage(const uint32_t Address);
+		void    BootloaderAPI_FillWord(const uint32_t Address, const uint16_t Word);
+		uint8_t BootloaderAPI_ReadSignature(const uint16_t Address);
+		uint8_t BootloaderAPI_ReadFuse(const uint16_t Address);
+		uint8_t BootloaderAPI_ReadLock(void);
+		void    BootloaderAPI_WriteLock(const uint8_t LockBits);
+
+#endif
+
diff --git a/Bootloaders/Printer/BootloaderAPITable.S b/Bootloaders/Printer/BootloaderAPITable.S
new file mode 100644
index 0000000000..76f37bf499
--- /dev/null
+++ b/Bootloaders/Printer/BootloaderAPITable.S
@@ -0,0 +1,91 @@
+/*
+             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.
+*/
+
+; Trampolines to actual API implementations if the target address is outside the
+; range of a rjmp instruction (can happen with large bootloader sections)
+.section .apitable_trampolines, "ax"
+.global BootloaderAPI_Trampolines
+BootloaderAPI_Trampolines:
+
+	BootloaderAPI_ErasePage_Trampoline:
+		jmp BootloaderAPI_ErasePage
+	BootloaderAPI_WritePage_Trampoline:
+		jmp BootloaderAPI_WritePage
+	BootloaderAPI_FillWord_Trampoline:
+		jmp BootloaderAPI_FillWord
+	BootloaderAPI_ReadSignature_Trampoline:
+		jmp BootloaderAPI_ReadSignature
+	BootloaderAPI_ReadFuse_Trampoline:
+		jmp BootloaderAPI_ReadFuse
+	BootloaderAPI_ReadLock_Trampoline:
+		jmp BootloaderAPI_ReadLock
+	BootloaderAPI_WriteLock_Trampoline:
+		jmp BootloaderAPI_WriteLock
+	BootloaderAPI_UNUSED1:
+		ret
+	BootloaderAPI_UNUSED2:
+		ret
+	BootloaderAPI_UNUSED3:
+		ret
+	BootloaderAPI_UNUSED4:
+		ret
+	BootloaderAPI_UNUSED5:
+		ret
+
+
+
+; API function jump table
+.section .apitable_jumptable, "ax"
+.global BootloaderAPI_JumpTable
+BootloaderAPI_JumpTable:
+
+	rjmp BootloaderAPI_ErasePage_Trampoline
+	rjmp BootloaderAPI_WritePage_Trampoline
+	rjmp BootloaderAPI_FillWord_Trampoline
+	rjmp BootloaderAPI_ReadSignature_Trampoline
+	rjmp BootloaderAPI_ReadFuse_Trampoline
+	rjmp BootloaderAPI_ReadLock_Trampoline
+	rjmp BootloaderAPI_WriteLock_Trampoline
+	rjmp BootloaderAPI_UNUSED1 ; UNUSED ENTRY 1
+	rjmp BootloaderAPI_UNUSED2 ; UNUSED ENTRY 2
+	rjmp BootloaderAPI_UNUSED3 ; UNUSED ENTRY 3
+	rjmp BootloaderAPI_UNUSED4 ; UNUSED ENTRY 4
+	rjmp BootloaderAPI_UNUSED5 ; UNUSED ENTRY 5
+
+
+
+; Bootloader table signatures and information
+.section .apitable_signatures, "ax"
+.global BootloaderAPI_Signatures
+BootloaderAPI_Signatures:
+
+	.long BOOT_START_ADDR ; Start address of the bootloader
+	.word 0xDF20 ; Signature for the Printer class bootloader
+	.word 0xDCFB ; Signature for a LUFA class bootloader
diff --git a/Bootloaders/Printer/BootloaderPrinter.c b/Bootloaders/Printer/BootloaderPrinter.c
new file mode 100644
index 0000000000..9021f998f7
--- /dev/null
+++ b/Bootloaders/Printer/BootloaderPrinter.c
@@ -0,0 +1,487 @@
+/*
+             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 Printer class bootloader. This file contains the complete bootloader logic.
+ */
+
+#include "BootloaderPrinter.h"
+
+/** LUFA Printer Class driver interface configuration and state information. This structure is
+ *  passed to all Printer Class driver functions, so that multiple instances of the same class
+ *  within a device can be differentiated from one another.
+ */
+USB_ClassInfo_PRNT_Device_t TextOnly_Printer_Interface =
+	{
+		.Config =
+			{
+				.InterfaceNumber          = INTERFACE_ID_Printer,
+				.DataINEndpoint           =
+					{
+						.Address          = PRINTER_IN_EPADDR,
+						.Size             = PRINTER_IO_EPSIZE,
+						.Banks            = 1,
+					},
+				.DataOUTEndpoint =
+					{
+						.Address          = PRINTER_OUT_EPADDR,
+						.Size             = PRINTER_IO_EPSIZE,
+						.Banks            = 1,
+					},
+				.IEEE1284String =
+					"MFG:Generic;"
+					"MDL:Generic_/_Text_Only;"
+					"CMD:1284.4;"
+					"CLS:PRINTER",
+			},
+	};
+
+/** Intel HEX parser state machine state information, to track the contents of
+ *  a HEX file streamed in as a sequence of arbitrary bytes.
+ */
+struct
+{
+	/** Current HEX parser state machine state. */
+	uint8_t  ParserState;
+	/** Previously decoded numerical byte of data. */
+	uint8_t  PrevData;
+	/** Currently decoded numerical byte of data. */
+	uint8_t  Data;
+	/** Indicates if both bytes that correspond to a single decoded numerical
+	 *  byte of data (HEX encodes values in ASCII HEX, two characters per byte)
+	 *  have been read.
+	 */
+	bool     ReadMSB;
+	/** Intel HEX record type of the current Intel HEX record. */
+	uint8_t  RecordType;
+	/** Numerical bytes of data remaining to be read in the current record. */
+	uint8_t  DataRem;
+	/** Checksum of the current record received so far. */
+	uint8_t  Checksum;
+	/** Starting address of the last addressed FLASH page. */
+	uint32_t PageStartAddress;
+	/** Current 32-bit byte extended base address in FLASH being targeted. */
+	uint32_t CurrBaseAddress;
+	/** Current 32-bit byte address in FLASH being targeted. */
+	uint32_t CurrAddress;
+} HEXParser;
+
+/** Indicates if there is data waiting to be written to a physical page of
+ *  memory in FLASH.
+ */
+static bool PageDirty = false;
+
+/** Flag to indicate if the bootloader should be running, or should exit and allow the application code to run
+ *  via a soft reset. When cleared, the bootloader will abort, the USB interface will shut down and the application
+ *  started via a forced watchdog reset.
+ */
+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)();
+	}
+}
+
+/**
+ * Converts a given input byte of data from an ASCII encoded HEX value to an integer value.
+ *
+ * \note Input HEX bytes are expected to be in uppercase only.
+ *
+ * \param[in] Byte  ASCII byte of data to convert
+ *
+ * \return Integer converted value of the input ASCII encoded HEX byte of data, or -1 if the
+ *         input is not valid ASCII encoded HEX.
+ */
+static int8_t HexToDecimal(const char Byte)
+{
+	if ((Byte >= 'A') && (Byte <= 'F'))
+	  return (10 + (Byte - 'A'));
+	else if ((Byte >= '0') && (Byte <= '9'))
+	  return (Byte - '0');
+
+	return -1;
+}
+
+/**
+ * Flushes a partially written page of data to physical FLASH, if a page
+ * boundary has been crossed.
+ *
+ * \note If a page flush occurs the global HEX parser state is updated.
+ */
+static void FlushPageIfRequired(void)
+{
+	/* Abort if no data has been buffered for writing to the current page */
+	if (!PageDirty)
+	  return;
+
+	/* Flush the FLASH page to physical memory if we are crossing a page boundary */
+	uint32_t NewPageStartAddress = (HEXParser.CurrAddress & ~(SPM_PAGESIZE - 1));
+	if (HEXParser.PageStartAddress != NewPageStartAddress)
+	{
+		boot_page_write(HEXParser.PageStartAddress);
+		boot_spm_busy_wait();
+
+		HEXParser.PageStartAddress = NewPageStartAddress;
+
+		PageDirty = false;
+	}
+}
+
+/**
+ * Parses an input Intel HEX formatted stream one character at a time, loading
+ * the data contents into the device's internal FLASH memory.
+ *
+ * \param[in] ReadCharacter  Next input ASCII byte of data to parse
+ */
+static void ParseIntelHEXByte(const char ReadCharacter)
+{
+	/* Reset the line parser while waiting for a new line to start */
+	if ((HEXParser.ParserState == HEX_PARSE_STATE_WAIT_LINE) || (ReadCharacter == ':'))
+	{
+		HEXParser.Checksum     = 0;
+		HEXParser.CurrAddress  = HEXParser.CurrBaseAddress;
+		HEXParser.ReadMSB      = false;
+
+		/* ASCII ':' indicates the start of a new HEX record */
+		if (ReadCharacter == ':')
+		  HEXParser.ParserState = HEX_PARSE_STATE_BYTE_COUNT;
+
+		return;
+	}
+
+	/* Only allow ASCII HEX encoded digits, ignore all other characters */
+	int8_t ReadCharacterDec = HexToDecimal(ReadCharacter);
+	if (ReadCharacterDec < 0)
+	  return;
+
+	/* Read and convert the next nibble of data from the current character */
+	HEXParser.Data    = (HEXParser.Data << 4) | ReadCharacterDec;
+	HEXParser.ReadMSB = !HEXParser.ReadMSB;
+
+	/* Only process further when a full byte (two nibbles) have been read */
+	if (HEXParser.ReadMSB)
+	  return;
+
+	/* Intel HEX checksum is for all fields except starting character and the
+	 * checksum itself
+	 */
+	if (HEXParser.ParserState != HEX_PARSE_STATE_CHECKSUM)
+	  HEXParser.Checksum += HEXParser.Data;
+
+	switch (HEXParser.ParserState)
+	{
+		case HEX_PARSE_STATE_BYTE_COUNT:
+			HEXParser.DataRem      = HEXParser.Data;
+			HEXParser.ParserState  = HEX_PARSE_STATE_ADDRESS_HIGH;
+			break;
+
+		case HEX_PARSE_STATE_ADDRESS_HIGH:
+			HEXParser.CurrAddress += ((uint16_t)HEXParser.Data << 8);
+			HEXParser.ParserState  = HEX_PARSE_STATE_ADDRESS_LOW;
+			break;
+
+		case HEX_PARSE_STATE_ADDRESS_LOW:
+			HEXParser.CurrAddress += HEXParser.Data;
+			HEXParser.ParserState  = HEX_PARSE_STATE_RECORD_TYPE;
+			break;
+
+		case HEX_PARSE_STATE_RECORD_TYPE:
+			HEXParser.RecordType   = HEXParser.Data;
+			HEXParser.ParserState  = (HEXParser.DataRem ? HEX_PARSE_STATE_READ_DATA : HEX_PARSE_STATE_CHECKSUM);
+			break;
+
+		case HEX_PARSE_STATE_READ_DATA:
+			/* Track the number of read data bytes in the record */
+			HEXParser.DataRem--;
+
+			/* Protect the bootloader against being written to */
+			if (HEXParser.CurrAddress >= BOOT_START_ADDR)
+			{
+				HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE;
+				PageDirty = false;
+				return;
+			}
+
+			/* Wait for a machine word (two bytes) of data to be read */
+			if (HEXParser.DataRem & 0x01)
+			{
+				HEXParser.PrevData = HEXParser.Data;
+				break;
+			}
+
+			/* Convert the last two received data bytes into a 16-bit word */
+			uint16_t NewDataWord = ((uint16_t)HEXParser.Data << 8) | HEXParser.PrevData;
+
+			switch (HEXParser.RecordType)
+			{
+				case HEX_RECORD_TYPE_Data:
+					/* If we are writing to a new page, we need to erase it first */
+					if (!(PageDirty))
+					{
+						boot_page_erase(HEXParser.PageStartAddress);
+						boot_spm_busy_wait();
+
+						PageDirty = true;
+					}
+
+					/* Fill the FLASH memory buffer with the new word of data */
+					boot_page_fill(HEXParser.CurrAddress, NewDataWord);
+					HEXParser.CurrAddress += 2;
+
+					/* Flush the FLASH page to physical memory if we are crossing a page boundary */
+					FlushPageIfRequired();
+					break;
+
+				case HEX_RECORD_TYPE_ExtendedSegmentAddress:
+					/* Extended address data - store the upper 12-bits of the new address */
+					HEXParser.CurrBaseAddress = ((uint32_t)NewDataWord << 4);
+					break;
+
+				case HEX_RECORD_TYPE_ExtendedLinearAddress:
+					/* Extended address data - store the upper 16-bits of the new address */
+					HEXParser.CurrBaseAddress = ((uint32_t)NewDataWord << 16);
+					break;
+			}
+
+			if (!HEXParser.DataRem)
+			  HEXParser.ParserState = HEX_PARSE_STATE_CHECKSUM;
+			break;
+
+		case HEX_PARSE_STATE_CHECKSUM:
+			/* Verify checksum of the completed record */
+			if (HEXParser.Data != ((~HEXParser.Checksum + 1) & 0xFF))
+			  break;
+
+			/* Flush the FLASH page to physical memory if we are crossing a page boundary */
+			FlushPageIfRequired();
+
+			/* If end of the HEX file reached, the bootloader should exit at next opportunity */
+			if (HEXParser.RecordType == HEX_RECORD_TYPE_EndOfFile)
+			  RunBootloader = false;
+
+			break;
+
+		default:
+			HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE;
+			break;
+	}
+}
+
+/** 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();
+
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+	GlobalInterruptEnable();
+
+	while (RunBootloader)
+	{
+		uint8_t BytesReceived = PRNT_Device_BytesReceived(&TextOnly_Printer_Interface);
+
+		if (BytesReceived)
+		{
+			LEDs_SetAllLEDs(LEDMASK_USB_BUSY);
+
+			while (BytesReceived--)
+			{
+				int16_t ReceivedByte = PRNT_Device_ReceiveByte(&TextOnly_Printer_Interface);
+
+				/* Feed the next byte of data to the HEX parser */
+				ParseIntelHEXByte(ReceivedByte);
+			}
+
+			LEDs_SetAllLEDs(LEDMASK_USB_READY);
+		}
+
+		PRNT_Device_USBTask(&TextOnly_Printer_Interface);
+		USB_USBTask();
+	}
+
+	/* 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 the board hardware and chip peripherals for the demo's functionality. */
+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);
+
+	/* Hardware Initialization */
+	LEDs_Init();
+	USB_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_Connect event. This indicates that the device is enumerating via the status LEDs. */
+void EVENT_USB_Device_Connect(void)
+{
+	/* Indicate USB enumerating */
+	LEDs_SetAllLEDs(LEDMASK_USB_ENUMERATING);
+}
+
+/** 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 Printer management task.
+ */
+void EVENT_USB_Device_Disconnect(void)
+{
+	/* Indicate USB not ready */
+	LEDs_SetAllLEDs(LEDMASK_USB_NOTREADY);
+}
+
+/** Event handler for the USB_ConfigurationChanged event. This is fired when the host set the current configuration
+ *  of the USB device after enumeration - the device endpoints are configured and the Mass Storage management task started.
+ */
+void EVENT_USB_Device_ConfigurationChanged(void)
+{
+	bool ConfigSuccess = true;
+
+	/* Setup Printer Data Endpoints */
+	ConfigSuccess &= PRNT_Device_ConfigureEndpoints(&TextOnly_Printer_Interface);
+
+	/* Reset the HEX parser upon successful connection to a host */
+	HEXParser.ParserState = HEX_PARSE_STATE_WAIT_LINE;
+
+	/* Indicate endpoint configuration success or failure */
+	LEDs_SetAllLEDs(ConfigSuccess ? LEDMASK_USB_READY : LEDMASK_USB_ERROR);
+}
+
+/** 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)
+{
+	PRNT_Device_ProcessControlRequest(&TextOnly_Printer_Interface);
+}
diff --git a/Bootloaders/Printer/BootloaderPrinter.h b/Bootloaders/Printer/BootloaderPrinter.h
new file mode 100644
index 0000000000..8bc1a68799
--- /dev/null
+++ b/Bootloaders/Printer/BootloaderPrinter.h
@@ -0,0 +1,108 @@
+/*
+             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
+ *
+ *  Header file for BootloaderPrinter.c.
+ */
+
+#ifndef _BOOTLOADER_PRINTER_H_
+#define _BOOTLOADER_PRINTER_H_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/wdt.h>
+		#include <avr/power.h>
+		#include <avr/interrupt.h>
+
+		#include "Descriptors.h"
+
+		#include <LUFA/Drivers/Board/LEDs.h>
+		#include <LUFA/Drivers/USB/USB.h>
+		#include <LUFA/Platform/Platform.h>
+
+	/* Preprocessor Checks: */
+		#if !defined(__OPTIMIZE_SIZE__)
+			#error This bootloader requires that it be optimized for size, not speed, to fit into the target device. Change optimization settings and try again.
+		#endif
+
+	/* Macros: */
+		/** LED mask for the library LED driver, to indicate that the USB interface is not ready. */
+		#define LEDMASK_USB_NOTREADY       LEDS_LED1
+
+		/** LED mask for the library LED driver, to indicate that the USB interface is enumerating. */
+		#define LEDMASK_USB_ENUMERATING   (LEDS_LED2 | LEDS_LED3)
+
+		/** LED mask for the library LED driver, to indicate that the USB interface is ready. */
+		#define LEDMASK_USB_READY         (LEDS_LED2 | LEDS_LED4)
+
+		/** LED mask for the library LED driver, to indicate that an error has occurred in the USB interface. */
+		#define LEDMASK_USB_ERROR         (LEDS_LED1 | LEDS_LED3)
+
+		/** LED mask for the library LED driver, to indicate that the USB interface is busy. */
+		#define LEDMASK_USB_BUSY           LEDS_LED2
+
+		/** Magic bootloader key to unlock forced application start mode. */
+		#define MAGIC_BOOT_KEY             0xDC42
+
+	/* Enums: */
+		/** Intel HEX parser state machine states. */
+		enum HEX_Parser_States_t
+		{
+			HEX_PARSE_STATE_WAIT_LINE,    /**< Parser is waiting for a HEX Start of Line character. */
+			HEX_PARSE_STATE_BYTE_COUNT,   /**< Parser is waiting for a record byte count. */
+			HEX_PARSE_STATE_ADDRESS_HIGH, /**< Parser is waiting for the MSB of a record address. */
+			HEX_PARSE_STATE_ADDRESS_LOW,  /**< Parser is waiting for the LSB of a record address. */
+			HEX_PARSE_STATE_RECORD_TYPE,  /**< Parser is waiting for the record type. */
+			HEX_PARSE_STATE_READ_DATA,    /**< Parser is waiting for more data in the current record. */
+			HEX_PARSE_STATE_CHECKSUM,     /**< Parser is waiting for the checksum of the current record. */
+		};
+
+		/** Intel HEX record types, used to indicate the type of record contained in a line of a HEX file. */
+		enum HEX_Record_Types_t
+		{
+			HEX_RECORD_TYPE_Data                   = 0, /**< Record contains loadable data. */
+			HEX_RECORD_TYPE_EndOfFile              = 1, /**< End of file record. */
+			HEX_RECORD_TYPE_ExtendedSegmentAddress = 2, /**< Extended segment start record. */
+			HEX_RECORD_TYPE_StartSegmentAddress    = 3, /**< Normal segment start record. */
+			HEX_RECORD_TYPE_ExtendedLinearAddress  = 4, /**< Extended linear address start record. */
+			HEX_RECORD_TYPE_StartLinearAddress     = 5, /**< Linear address start record. */
+		};
+
+	/* Function Prototypes: */
+		static void SetupHardware(void);
+
+		void EVENT_USB_Device_Connect(void);
+		void EVENT_USB_Device_Disconnect(void);
+		void EVENT_USB_Device_ConfigurationChanged(void);
+		void EVENT_USB_Device_ControlRequest(void);
+
+#endif
+
diff --git a/Bootloaders/Printer/BootloaderPrinter.txt b/Bootloaders/Printer/BootloaderPrinter.txt
new file mode 100644
index 0000000000..d9aa79686f
--- /dev/null
+++ b/Bootloaders/Printer/BootloaderPrinter.txt
@@ -0,0 +1,202 @@
+/** \file
+ *
+ *  This file contains special DoxyGen information for the generation of the main page and other special
+ *  documentation pages. It is not a project source file.
+ */
+
+/** \mainpage Printer Class USB AVR Bootloader
+ *
+ *  \section Sec_Compat Demo Compatibility:
+ *
+ *  The following list indicates what microcontrollers are compatible with this demo.
+ *
+ *  \li Series 7 USB AVRs (AT90USBxxx7)
+ *  \li Series 6 USB AVRs (AT90USBxxx6)
+ *  \li Series 4 USB AVRs (ATMEGAxxU4)
+ *  \li Series 2 USB AVRs (AT90USBxx2, ATMEGAxxU2)
+ *
+ *  \section Sec_Info USB Information:
+ *
+ *  The following table gives a rundown of the USB utilization of this demo.
+ *
+ *  <table>
+ *   <tr>
+ *    <td><b>USB Mode:</b></td>
+ *    <td>Device</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>USB Class:</b></td>
+ *    <td>Printer Class</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>USB Subclass:</b></td>
+ *    <td>Printer Subclass</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Relevant Standards:</b></td>
+ *    <td>USBIF Printer Class Standard</td>
+ *   </tr>
+ *   <tr>
+ *    <td><b>Supported USB Speeds:</b></td>
+ *    <td>Full Speed Mode</td>
+ *   </tr>
+ *  </table>
+ *
+ *  \section Sec_Description Project Description:
+ *
+ *  This bootloader enumerates to the host as a Generic Text Only Printer device, capable of reading and parsing
+ *  "printed" plain-text Intel HEX files to load firmware onto the AVR.
+ *
+ *  Out of the box this bootloader builds for the AT90USB1287 with an 8KB bootloader section size, and will fit
+ *  into 4KB of bootloader space. If you wish to alter this size and/or change the AVR model, you will need to
+ *  edit the MCU, FLASH_SIZE_KB and BOOT_SECTION_SIZE_KB values in the accompanying makefile.
+ *
+ *  When the bootloader is running, the board's LED(s) will flash at regular intervals to distinguish the
+ *  bootloader from the normal user application.
+ *
+ *  \section Sec_Running Running the Bootloader
+ *
+ *  On the USB AVR8 devices, setting the \c HWBE device fuse will cause the bootloader to run if the \c HWB pin of
+ *  the AVR is grounded when the device is reset.
+ *
+ *  The are two behaviours of this bootloader, depending on the device's fuses:
+ *
+ *  <b>If the device's BOOTRST fuse is set</b>, the bootloader will run any time the system is reset from
+ *  the external reset pin, unless no valid user application has been loaded. To initiate the bootloader, the
+ *  device's external reset pin should be grounded momentarily.
+ *
+ *  <b>If the device's BOOTRST fuse is not set</b>, the bootloader will run only if initiated via a software
+ *  jump, or if the \c HWB pin was low during the last device reset (if the \c HWBE fuse is set).
+ *
+ *  For board specific exceptions to the above, see below.
+ *
+ *  \subsection SSec_XPLAIN Atmel Xplain Board
+ *  Ground the USB AVR JTAG's \c TCK pin to ground when powering on the board to start the bootloader. This assumes the
+ *  \c HWBE fuse is cleared and the \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
+ *
+ *  \subsection SSec_Leonardo Arduino Leonardo Board
+ *  Ground \c IO13 when powering the board to start the bootloader. This assumes the \c HWBE fuse is cleared and the
+ *  \c BOOTRST fuse is set as the HWBE pin is not user accessible on this board.
+ *
+ *  \section Sec_Installation Driver Installation
+ *
+ *  This bootloader uses the Generic Text-Only printer drivers inbuilt into all modern operating systems, thus no
+ *  additional drivers need to be supplied for correct operation.
+ *
+ *  \section Sec_HostApp Host Controller Application
+ *
+ *  This bootloader is compatible with Notepad under Windows, and the command line \c lpr utility under Linux.
+ *
+ *  \subsection SSec_Notepad Notepad (Windows)
+ *
+ *  While most text applications under Windows will be compatible with the bootloader, the inbuilt Notepad utility
+ *  is recommended as it will introduce minimal formatting changes to the output stream. To program with Notepad,
+ *  open the target HEX file and print it to the Generic Text Only printer device the bootloader creates.
+ *
+ *  \subsection SSec_LPR LPR (Linux)
+ *
+ *  While the CUPS framework under Linux will enumerate the bootloader as a Generic Text-Only printer, many
+ *  applications will refuse to print to the device due to the lack of rich formatting options available. As a result,
+ *  under Linux HEX files must be printed via the low level \c lpr utility instead.
+ *
+ *