Merge pull request #1471 from qmk/lufa_lib

Update LUFA and move it to /lib/lufa

4 files changed, 1129 insertions, 0 deletions

diff --git a/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c
new file mode 100644
index 0000000000..6553504d5e
--- /dev/null
+++ b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.c
@@ -0,0 +1,531 @@
+/*
+             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
+ *
+ *  ISP Protocol handler, to process V2 Protocol wrapped ISP commands used in Atmel programmer devices.
+ */
+
+#include "ISPProtocol.h"
+
+#if defined(ENABLE_ISP_PROTOCOL) || defined(__DOXYGEN__)
+
+/** Handler for the CMD_ENTER_PROGMODE_ISP command, which attempts to enter programming mode on
+ *  the attached device, returning success or failure back to the host.
+ */
+void ISPProtocol_EnterISPMode(void)
+{
+	struct
+	{
+		uint8_t TimeoutMS;
+		uint8_t PinStabDelayMS;
+		uint8_t ExecutionDelayMS;
+		uint8_t SynchLoops;
+		uint8_t ByteDelay;
+		uint8_t PollValue;
+		uint8_t PollIndex;
+		uint8_t EnterProgBytes[4];
+	} Enter_ISP_Params;
+
+	Endpoint_Read_Stream_LE(&Enter_ISP_Params, sizeof(Enter_ISP_Params), NULL);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	uint8_t ResponseStatus = STATUS_CMD_FAILED;
+
+	CurrentAddress = 0;
+
+	/* Perform execution delay, initialize SPI bus */
+	ISPProtocol_DelayMS(Enter_ISP_Params.ExecutionDelayMS);
+	ISPTarget_EnableTargetISP();
+
+	ISPTarget_ChangeTargetResetLine(true);
+	ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
+
+	/* Continuously attempt to synchronize with the target until either the number of attempts specified
+	 * by the host has exceeded, or the the device sends back the expected response values */
+	while (Enter_ISP_Params.SynchLoops-- && TimeoutTicksRemaining)
+	{
+		uint8_t ResponseBytes[4];
+
+		for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
+		{
+			ISPProtocol_DelayMS(Enter_ISP_Params.ByteDelay);
+			ResponseBytes[RByte] = ISPTarget_TransferByte(Enter_ISP_Params.EnterProgBytes[RByte]);
+		}
+
+		/* Check if polling disabled, or if the polled value matches the expected value */
+		if (!(Enter_ISP_Params.PollIndex) || (ResponseBytes[Enter_ISP_Params.PollIndex - 1] == Enter_ISP_Params.PollValue))
+		{
+			ResponseStatus = STATUS_CMD_OK;
+			break;
+		}
+		else
+		{
+			ISPTarget_ChangeTargetResetLine(false);
+			ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
+			ISPTarget_ChangeTargetResetLine(true);
+			ISPProtocol_DelayMS(Enter_ISP_Params.PinStabDelayMS);
+		}
+	}
+
+	Endpoint_Write_8(CMD_ENTER_PROGMODE_ISP);
+	Endpoint_Write_8(ResponseStatus);
+	Endpoint_ClearIN();
+}
+
+/** Handler for the CMD_LEAVE_ISP command, which releases the target from programming mode. */
+void ISPProtocol_LeaveISPMode(void)
+{
+	struct
+	{
+		uint8_t PreDelayMS;
+		uint8_t PostDelayMS;
+	} Leave_ISP_Params;
+
+	Endpoint_Read_Stream_LE(&Leave_ISP_Params, sizeof(Leave_ISP_Params), NULL);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	/* Perform pre-exit delay, release the target /RESET, disable the SPI bus and perform the post-exit delay */
+	ISPProtocol_DelayMS(Leave_ISP_Params.PreDelayMS);
+	ISPTarget_ChangeTargetResetLine(false);
+	ISPTarget_DisableTargetISP();
+	ISPProtocol_DelayMS(Leave_ISP_Params.PostDelayMS);
+
+	Endpoint_Write_8(CMD_LEAVE_PROGMODE_ISP);
+	Endpoint_Write_8(STATUS_CMD_OK);
+	Endpoint_ClearIN();
+}
+
+/** Handler for the CMD_PROGRAM_FLASH_ISP and CMD_PROGRAM_EEPROM_ISP commands, writing out bytes,
+ *  words or pages of data to the attached device.
+ *
+ *  \param[in] V2Command  Issued V2 Protocol command byte from the host
+ */
+void ISPProtocol_ProgramMemory(uint8_t V2Command)
+{
+	struct
+	{
+		uint16_t BytesToWrite;
+		uint8_t  ProgrammingMode;
+		uint8_t  DelayMS;
+		uint8_t  ProgrammingCommands[3];
+		uint8_t  PollValue1;
+		uint8_t  PollValue2;
+		uint8_t  ProgData[256]; // Note, the Jungo driver has a very short ACK timeout period, need to buffer the
+	} Write_Memory_Params;      // whole page and ACK the packet as fast as possible to prevent it from aborting
+
+	Endpoint_Read_Stream_LE(&Write_Memory_Params, (sizeof(Write_Memory_Params) -
+	                                               sizeof(Write_Memory_Params.ProgData)), NULL);
+	Write_Memory_Params.BytesToWrite = SwapEndian_16(Write_Memory_Params.BytesToWrite);
+
+	if (Write_Memory_Params.BytesToWrite > sizeof(Write_Memory_Params.ProgData))
+	{
+		Endpoint_ClearOUT();
+		Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+		Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+		Endpoint_Write_8(V2Command);
+		Endpoint_Write_8(STATUS_CMD_FAILED);
+		Endpoint_ClearIN();
+		return;
+	}
+
+	Endpoint_Read_Stream_LE(&Write_Memory_Params.ProgData, Write_Memory_Params.BytesToWrite, NULL);
+
+	// The driver will terminate transfers that are a round multiple of the endpoint bank in size with a ZLP, need
+	// to catch this and discard it before continuing on with packet processing to prevent communication issues
+	if (((sizeof(uint8_t) + sizeof(Write_Memory_Params) - sizeof(Write_Memory_Params.ProgData)) +
+	    Write_Memory_Params.BytesToWrite) % AVRISP_DATA_EPSIZE == 0)
+	{
+		Endpoint_ClearOUT();
+		Endpoint_WaitUntilReady();
+	}
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	uint8_t  ProgrammingStatus = STATUS_CMD_OK;
+	uint8_t  PollValue         = (V2Command == CMD_PROGRAM_FLASH_ISP) ? Write_Memory_Params.PollValue1 :
+	                                                                    Write_Memory_Params.PollValue2;
+	uint16_t PollAddress       = 0;
+	uint8_t* NextWriteByte     = Write_Memory_Params.ProgData;
+	uint16_t PageStartAddress  = (CurrentAddress & 0xFFFF);
+
+	for (uint16_t CurrentByte = 0; CurrentByte < Write_Memory_Params.BytesToWrite; CurrentByte++)
+	{
+		uint8_t ByteToWrite     = *(NextWriteByte++);
+		uint8_t ProgrammingMode = Write_Memory_Params.ProgrammingMode;
+
+		/* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
+		if (MustLoadExtendedAddress)
+		{
+			ISPTarget_LoadExtendedAddress();
+			MustLoadExtendedAddress = false;
+		}
+
+		ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[0]);
+		ISPTarget_SendByte(CurrentAddress >> 8);
+		ISPTarget_SendByte(CurrentAddress & 0xFF);
+		ISPTarget_SendByte(ByteToWrite);
+
+		/* AVR FLASH addressing requires us to modify the write command based on if we are writing a high
+		 * or low byte at the current word address */
+		if (V2Command == CMD_PROGRAM_FLASH_ISP)
+		  Write_Memory_Params.ProgrammingCommands[0] ^= READ_WRITE_HIGH_BYTE_MASK;
+
+		/* Check to see if we have a valid polling address */
+		if (!(PollAddress) && (ByteToWrite != PollValue))
+		{
+			if ((CurrentByte & 0x01) && (V2Command == CMD_PROGRAM_FLASH_ISP))
+			  Write_Memory_Params.ProgrammingCommands[2] |=  READ_WRITE_HIGH_BYTE_MASK;
+			else
+			  Write_Memory_Params.ProgrammingCommands[2] &= ~READ_WRITE_HIGH_BYTE_MASK;
+
+			PollAddress = (CurrentAddress & 0xFFFF);
+		}
+
+		/* If in word programming mode, commit the byte to the target's memory */
+		if (!(ProgrammingMode & PROG_MODE_PAGED_WRITES_MASK))
+		{
+			/* If the current polling address is invalid, switch to timed delay write completion mode */
+			if (!(PollAddress) && !(ProgrammingMode & PROG_MODE_WORD_READYBUSY_MASK))
+			  ProgrammingMode = (ProgrammingMode & ~PROG_MODE_WORD_VALUE_MASK) | PROG_MODE_WORD_TIMEDELAY_MASK;
+
+			ProgrammingStatus = ISPTarget_WaitForProgComplete(ProgrammingMode, PollAddress, PollValue,
+			                                                  Write_Memory_Params.DelayMS,
+			                                                  Write_Memory_Params.ProgrammingCommands[2]);
+
+			/* Abort the programming loop early if the byte/word programming failed */
+			if (ProgrammingStatus != STATUS_CMD_OK)
+			  break;
+
+			/* Must reset the polling address afterwards, so it is not erroneously used for the next byte */
+			PollAddress = 0;
+		}
+
+		/* EEPROM just increments the address each byte, flash needs to increment on each word and
+		 * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
+		 * address boundary has been crossed during FLASH memory programming */
+		if ((CurrentByte & 0x01) || (V2Command == CMD_PROGRAM_EEPROM_ISP))
+		{
+			CurrentAddress++;
+
+			if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
+			  MustLoadExtendedAddress = true;
+		}
+	}
+
+	/* If the current page must be committed, send the PROGRAM PAGE command to the target */
+	if (Write_Memory_Params.ProgrammingMode & PROG_MODE_COMMIT_PAGE_MASK)
+	{
+		ISPTarget_SendByte(Write_Memory_Params.ProgrammingCommands[1]);
+		ISPTarget_SendByte(PageStartAddress >> 8);
+		ISPTarget_SendByte(PageStartAddress & 0xFF);
+		ISPTarget_SendByte(0x00);
+
+		/* Check if polling is enabled and possible, if not switch to timed delay mode */
+		if ((Write_Memory_Params.ProgrammingMode & PROG_MODE_PAGED_VALUE_MASK) && !(PollAddress))
+		{
+			Write_Memory_Params.ProgrammingMode = (Write_Memory_Params.ProgrammingMode & ~PROG_MODE_PAGED_VALUE_MASK) |
+												   PROG_MODE_PAGED_TIMEDELAY_MASK;
+		}
+
+		ProgrammingStatus = ISPTarget_WaitForProgComplete(Write_Memory_Params.ProgrammingMode, PollAddress, PollValue,
+		                                                  Write_Memory_Params.DelayMS,
+		                                                  Write_Memory_Params.ProgrammingCommands[2]);
+
+		/* Check to see if the FLASH address has crossed the extended address boundary */
+		if ((V2Command == CMD_PROGRAM_FLASH_ISP) && !(CurrentAddress & 0xFFFF))
+		  MustLoadExtendedAddress = true;
+	}
+
+	Endpoint_Write_8(V2Command);
+	Endpoint_Write_8(ProgrammingStatus);
+	Endpoint_ClearIN();
+}
+
+/** Handler for the CMD_READ_FLASH_ISP and CMD_READ_EEPROM_ISP commands, reading in bytes,
+ *  words or pages of data from the attached device.
+ *
+ *  \param[in] V2Command  Issued V2 Protocol command byte from the host
+ */
+void ISPProtocol_ReadMemory(uint8_t V2Command)
+{
+	struct
+	{
+		uint16_t BytesToRead;
+		uint8_t  ReadMemoryCommand;
+	} Read_Memory_Params;
+
+	Endpoint_Read_Stream_LE(&Read_Memory_Params, sizeof(Read_Memory_Params), NULL);
+	Read_Memory_Params.BytesToRead = SwapEndian_16(Read_Memory_Params.BytesToRead);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	Endpoint_Write_8(V2Command);
+	Endpoint_Write_8(STATUS_CMD_OK);
+
+	/* Read each byte from the device and write them to the packet for the host */
+	for (uint16_t CurrentByte = 0; CurrentByte < Read_Memory_Params.BytesToRead; CurrentByte++)
+	{
+		/* Check to see if we need to send a LOAD EXTENDED ADDRESS command to the target */
+		if (MustLoadExtendedAddress)
+		{
+			ISPTarget_LoadExtendedAddress();
+			MustLoadExtendedAddress = false;
+		}
+
+		/* Read the next byte from the desired memory space in the device */
+		ISPTarget_SendByte(Read_Memory_Params.ReadMemoryCommand);
+		ISPTarget_SendByte(CurrentAddress >> 8);
+		ISPTarget_SendByte(CurrentAddress & 0xFF);
+		Endpoint_Write_8(ISPTarget_ReceiveByte());
+
+		/* Check if the endpoint bank is currently full, if so send the packet */
+		if (!(Endpoint_IsReadWriteAllowed()))
+		{
+			Endpoint_ClearIN();
+			Endpoint_WaitUntilReady();
+		}
+
+		/* AVR FLASH addressing requires us to modify the read command based on if we are reading a high
+		 * or low byte at the current word address */
+		if (V2Command == CMD_READ_FLASH_ISP)
+		  Read_Memory_Params.ReadMemoryCommand ^= READ_WRITE_HIGH_BYTE_MASK;
+
+		/* EEPROM just increments the address each byte, flash needs to increment on each word and
+		 * also check to ensure that a LOAD EXTENDED ADDRESS command is issued each time the extended
+		 * address boundary has been crossed */
+		if ((CurrentByte & 0x01) || (V2Command == CMD_READ_EEPROM_ISP))
+		{
+			CurrentAddress++;
+
+			if ((V2Command != CMD_READ_EEPROM_ISP) && !(CurrentAddress & 0xFFFF))
+			  MustLoadExtendedAddress = true;
+		}
+	}
+
+	Endpoint_Write_8(STATUS_CMD_OK);
+
+	bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
+	Endpoint_ClearIN();
+
+	/* Ensure last packet is a short packet to terminate the transfer */
+	if (IsEndpointFull)
+	{
+		Endpoint_WaitUntilReady();
+		Endpoint_ClearIN();
+		Endpoint_WaitUntilReady();
+	}
+}
+
+/** Handler for the CMD_CHI_ERASE_ISP command, clearing the target's FLASH memory. */
+void ISPProtocol_ChipErase(void)
+{
+	struct
+	{
+		uint8_t EraseDelayMS;
+		uint8_t PollMethod;
+		uint8_t EraseCommandBytes[4];
+	} Erase_Chip_Params;
+
+	Endpoint_Read_Stream_LE(&Erase_Chip_Params, sizeof(Erase_Chip_Params), NULL);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	uint8_t ResponseStatus = STATUS_CMD_OK;
+
+	/* Send the chip erase commands as given by the host to the device */
+	for (uint8_t SByte = 0; SByte < sizeof(Erase_Chip_Params.EraseCommandBytes); SByte++)
+	  ISPTarget_SendByte(Erase_Chip_Params.EraseCommandBytes[SByte]);
+
+	/* Use appropriate command completion check as given by the host (delay or busy polling) */
+	if (!(Erase_Chip_Params.PollMethod))
+	  ISPProtocol_DelayMS(Erase_Chip_Params.EraseDelayMS);
+	else
+	  ResponseStatus = ISPTarget_WaitWhileTargetBusy();
+
+	Endpoint_Write_8(CMD_CHIP_ERASE_ISP);
+	Endpoint_Write_8(ResponseStatus);
+	Endpoint_ClearIN();
+}
+
+/** Handler for the CMD_READ_FUSE_ISP, CMD_READ_LOCK_ISP, CMD_READ_SIGNATURE_ISP and CMD_READ_OSCCAL commands,
+ *  reading the requested configuration byte from the device.
+ *
+ *  \param[in] V2Command  Issued V2 Protocol command byte from the host
+ */
+void ISPProtocol_ReadFuseLockSigOSCCAL(uint8_t V2Command)
+{
+	struct
+	{
+		uint8_t RetByte;
+		uint8_t ReadCommandBytes[4];
+	} Read_FuseLockSigOSCCAL_Params;
+
+	Endpoint_Read_Stream_LE(&Read_FuseLockSigOSCCAL_Params, sizeof(Read_FuseLockSigOSCCAL_Params), NULL);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	uint8_t ResponseBytes[4];
+
+	/* Send the Fuse or Lock byte read commands as given by the host to the device, store response */
+	for (uint8_t RByte = 0; RByte < sizeof(ResponseBytes); RByte++)
+	  ResponseBytes[RByte] = ISPTarget_TransferByte(Read_FuseLockSigOSCCAL_Params.ReadCommandBytes[RByte]);
+
+	Endpoint_Write_8(V2Command);
+	Endpoint_Write_8(STATUS_CMD_OK);
+	Endpoint_Write_8(ResponseBytes[Read_FuseLockSigOSCCAL_Params.RetByte - 1]);
+	Endpoint_Write_8(STATUS_CMD_OK);
+	Endpoint_ClearIN();
+}
+
+/** Handler for the CMD_WRITE_FUSE_ISP and CMD_WRITE_LOCK_ISP commands, writing the requested configuration
+ *  byte to the device.
+ *
+ *  \param[in] V2Command  Issued V2 Protocol command byte from the host
+ */
+void ISPProtocol_WriteFuseLock(uint8_t V2Command)
+{
+	struct
+	{
+		uint8_t WriteCommandBytes[4];
+	} Write_FuseLockSig_Params;
+
+	Endpoint_Read_Stream_LE(&Write_FuseLockSig_Params, sizeof(Write_FuseLockSig_Params), NULL);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	/* Send the Fuse or Lock byte program commands as given by the host to the device */
+	for (uint8_t SByte = 0; SByte < sizeof(Write_FuseLockSig_Params.WriteCommandBytes); SByte++)
+	  ISPTarget_SendByte(Write_FuseLockSig_Params.WriteCommandBytes[SByte]);
+
+	Endpoint_Write_8(V2Command);
+	Endpoint_Write_8(STATUS_CMD_OK);
+	Endpoint_Write_8(STATUS_CMD_OK);
+	Endpoint_ClearIN();
+}
+
+/** Handler for the CMD_SPI_MULTI command, writing and reading arbitrary SPI data to and from the attached device. */
+void ISPProtocol_SPIMulti(void)
+{
+	struct
+	{
+		uint8_t TxBytes;
+		uint8_t RxBytes;
+		uint8_t RxStartAddr;
+		uint8_t TxData[255];
+	} SPI_Multi_Params;
+
+	Endpoint_Read_Stream_LE(&SPI_Multi_Params, (sizeof(SPI_Multi_Params) - sizeof(SPI_Multi_Params.TxData)), NULL);
+	Endpoint_Read_Stream_LE(&SPI_Multi_Params.TxData, SPI_Multi_Params.TxBytes, NULL);
+
+	Endpoint_ClearOUT();
+	Endpoint_SelectEndpoint(AVRISP_DATA_IN_EPADDR);
+	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
+
+	Endpoint_Write_8(CMD_SPI_MULTI);
+	Endpoint_Write_8(STATUS_CMD_OK);
+
+	uint8_t CurrTxPos = 0;
+	uint8_t CurrRxPos = 0;
+
+	/* Write out bytes to transmit until the start of the bytes to receive is met */
+	while (CurrTxPos < SPI_Multi_Params.RxStartAddr)
+	{
+		if (CurrTxPos < SPI_Multi_Params.TxBytes)
+		  ISPTarget_SendByte(SPI_Multi_Params.TxData[CurrTxPos]);
+		else
+		  ISPTarget_SendByte(0);
+
+		CurrTxPos++;
+	}
+
+	/* Transmit remaining bytes with padding as needed, read in response bytes */
+	while (CurrRxPos < SPI_Multi_Params.RxBytes)
+	{
+		if (CurrTxPos < SPI_Multi_Params.TxBytes)
+		  Endpoint_Write_8(ISPTarget_TransferByte(SPI_Multi_Params.TxData[CurrTxPos++]));
+		else
+		  Endpoint_Write_8(ISPTarget_ReceiveByte());
+
+		/* Check to see if we have filled the endpoint bank and need to send the packet */
+		if (!(Endpoint_IsReadWriteAllowed()))
+		{
+			Endpoint_ClearIN();
+			Endpoint_WaitUntilReady();
+		}
+
+		CurrRxPos++;
+	}
+
+	Endpoint_Write_8(STATUS_CMD_OK);
+
+	bool IsEndpointFull = !(Endpoint_IsReadWriteAllowed());
+	Endpoint_ClearIN();
+
+	/* Ensure last packet is a short packet to terminate the transfer */
+	if (IsEndpointFull)
+	{
+		Endpoint_WaitUntilReady();
+		Endpoint_ClearIN();
+		Endpoint_WaitUntilReady();
+	}
+}
+
+/** Blocking delay for a given number of milliseconds. This provides a simple wrapper around
+ *  the avr-libc provided delay function, so that the delay function can be called with a
+ *  constant value (to prevent run-time floating point operations being required).
+ *
+ *  \param[in] DelayMS  Number of milliseconds to delay for
+ */
+void ISPProtocol_DelayMS(uint8_t DelayMS)
+{
+	while (DelayMS-- && TimeoutTicksRemaining)
+	  Delay_MS(1);
+}
+
+#endif
+
diff --git a/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.h b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.h
new file mode 100644
index 0000000000..44b339762d
--- /dev/null
+++ b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPProtocol.h
@@ -0,0 +1,81 @@
+/*
+             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 ISPProtocol.c.
+ */
+
+#ifndef _ISP_PROTOCOL_
+#define _ISP_PROTOCOL_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <util/delay.h>
+
+		#include <LUFA/Drivers/USB/USB.h>
+
+		#include "../V2Protocol.h"
+		#include "Config/AppConfig.h"
+
+	/* Preprocessor Checks: */
+		#if ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
+			#undef ENABLE_ISP_PROTOCOL
+
+			#if !defined(ENABLE_XPROG_PROTOCOL)
+				#define ENABLE_XPROG_PROTOCOL
+			#endif
+		#endif
+
+	/* Macros: */
+		/** Mask for the reading or writing of the high byte in a FLASH word when issuing a low-level programming command. */
+		#define READ_WRITE_HIGH_BYTE_MASK       (1 << 3)
+
+		#define PROG_MODE_PAGED_WRITES_MASK     (1 << 0)
+		#define PROG_MODE_WORD_TIMEDELAY_MASK   (1 << 1)
+		#define PROG_MODE_WORD_VALUE_MASK       (1 << 2)
+		#define PROG_MODE_WORD_READYBUSY_MASK   (1 << 3)
+		#define PROG_MODE_PAGED_TIMEDELAY_MASK  (1 << 4)
+		#define PROG_MODE_PAGED_VALUE_MASK      (1 << 5)
+		#define PROG_MODE_PAGED_READYBUSY_MASK  (1 << 6)
+		#define PROG_MODE_COMMIT_PAGE_MASK      (1 << 7)
+
+	/* Function Prototypes: */
+		void ISPProtocol_EnterISPMode(void);
+		void ISPProtocol_LeaveISPMode(void);
+		void ISPProtocol_ProgramMemory(const uint8_t V2Command);
+		void ISPProtocol_ReadMemory(const uint8_t V2Command);
+		void ISPProtocol_ChipErase(void);
+		void ISPProtocol_ReadFuseLockSigOSCCAL(const uint8_t V2Command);
+		void ISPProtocol_WriteFuseLock(const uint8_t V2Command);
+		void ISPProtocol_SPIMulti(void);
+		void ISPProtocol_DelayMS(uint8_t DelayMS);
+#endif
+
diff --git a/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
new file mode 100644
index 0000000000..197b62275d
--- /dev/null
+++ b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.c
@@ -0,0 +1,370 @@
+/*
+             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
+ *
+ *  Target-related functions for the ISP Protocol decoder.
+ */
+
+#include "ISPTarget.h"
+
+#if defined(ENABLE_ISP_PROTOCOL) || defined(__DOXYGEN__)
+
+/** List of hardware SPI prescaler masks for possible AVRStudio ISP programming speeds.
+ *
+ *  \hideinitializer
+ */
+static const uint8_t SPIMaskFromSCKDuration[] PROGMEM =
+{
+#if (F_CPU == 8000000)
+	SPI_SPEED_FCPU_DIV_2,    // AVRStudio =   8MHz SPI, Actual =   4MHz SPI
+	SPI_SPEED_FCPU_DIV_2,    // AVRStudio =   4MHz SPI, Actual =   4MHz SPI
+	SPI_SPEED_FCPU_DIV_4,    // AVRStudio =   2MHz SPI, Actual =   2MHz SPI
+	SPI_SPEED_FCPU_DIV_8,    // AVRStudio =   1MHz SPI, Actual =   1MHz SPI
+	SPI_SPEED_FCPU_DIV_16,   // AVRStudio = 500KHz SPI, Actual = 500KHz SPI
+	SPI_SPEED_FCPU_DIV_32,   // AVRStudio = 250KHz SPI, Actual = 250KHz SPI
+	SPI_SPEED_FCPU_DIV_64,   // AVRStudio = 125KHz SPI, Actual = 125KHz SPI
+#elif (F_CPU == 16000000)
+	SPI_SPEED_FCPU_DIV_2,    // AVRStudio =   8MHz SPI, Actual =   8MHz SPI
+	SPI_SPEED_FCPU_DIV_4,    // AVRStudio =   4MHz SPI, Actual =   4MHz SPI
+	SPI_SPEED_FCPU_DIV_8,    // AVRStudio =   2MHz SPI, Actual =   2MHz SPI
+	SPI_SPEED_FCPU_DIV_16,   // AVRStudio =   1MHz SPI, Actual =   1MHz SPI
+	SPI_SPEED_FCPU_DIV_32,   // AVRStudio = 500KHz SPI, Actual = 500KHz SPI
+	SPI_SPEED_FCPU_DIV_64,   // AVRStudio = 250KHz SPI, Actual = 250KHz SPI
+	SPI_SPEED_FCPU_DIV_128   // AVRStudio = 125KHz SPI, Actual = 125KHz SPI
+#else
+	#error No SPI prescaler masks for chosen F_CPU speed.
+#endif
+};
+
+/** Lookup table to convert the slower ISP speeds into a compare value for the software SPI driver.
+ *
+ *  \hideinitializer
+ */
+static const uint16_t TimerCompareFromSCKDuration[] PROGMEM =
+{
+	TIMER_COMP(96386), TIMER_COMP(89888), TIMER_COMP(84211), TIMER_COMP(79208), TIMER_COMP(74767),
+	TIMER_COMP(70797), TIMER_COMP(67227), TIMER_COMP(64000), TIMER_COMP(61069), TIMER_COMP(58395),
+	TIMER_COMP(55945), TIMER_COMP(51613), TIMER_COMP(49690), TIMER_COMP(47905), TIMER_COMP(46243),
+	TIMER_COMP(43244), TIMER_COMP(41885), TIMER_COMP(39409), TIMER_COMP(38278), TIMER_COMP(36200),
+	TIMER_COMP(34335), TIMER_COMP(32654), TIMER_COMP(31129), TIMER_COMP(29740), TIMER_COMP(28470),
+	TIMER_COMP(27304), TIMER_COMP(25724), TIMER_COMP(24768), TIMER_COMP(23461), TIMER_COMP(22285),
+	TIMER_COMP(21221), TIMER_COMP(20254), TIMER_COMP(19371), TIMER_COMP(18562), TIMER_COMP(17583),
+	TIMER_COMP(16914), TIMER_COMP(16097), TIMER_COMP(15356), TIMER_COMP(14520), TIMER_COMP(13914),
+	TIMER_COMP(13224), TIMER_COMP(12599), TIMER_COMP(12031), TIMER_COMP(11511), TIMER_COMP(10944),
+	TIMER_COMP(10431), TIMER_COMP(9963),  TIMER_COMP(9468),  TIMER_COMP(9081),  TIMER_COMP(8612),
+	TIMER_COMP(8239),  TIMER_COMP(7851),  TIMER_COMP(7498),  TIMER_COMP(7137),  TIMER_COMP(6809),
+	TIMER_COMP(6478),  TIMER_COMP(6178),  TIMER_COMP(5879),  TIMER_COMP(5607),  TIMER_COMP(5359),
+	TIMER_COMP(5093),  TIMER_COMP(4870),  TIMER_COMP(4633),  TIMER_COMP(4418),  TIMER_COMP(4209),
+	TIMER_COMP(4019),  TIMER_COMP(3823),  TIMER_COMP(3645),  TIMER_COMP(3474),  TIMER_COMP(3310),
+	TIMER_COMP(3161),  TIMER_COMP(3011),  TIMER_COMP(2869),  TIMER_COMP(2734),  TIMER_COMP(2611),
+	TIMER_COMP(2484),  TIMER_COMP(2369),  TIMER_COMP(2257),  TIMER_COMP(2152),  TIMER_COMP(2052),
+	TIMER_COMP(1956),  TIMER_COMP(1866),  TIMER_COMP(1779),  TIMER_COMP(1695),  TIMER_COMP(1615),
+	TIMER_COMP(1539),  TIMER_COMP(1468),  TIMER_COMP(1398),  TIMER_COMP(1333),  TIMER_COMP(1271),
+	TIMER_COMP(1212),  TIMER_COMP(1155),  TIMER_COMP(1101),  TIMER_COMP(1049),  TIMER_COMP(1000),
+	TIMER_COMP(953),   TIMER_COMP(909),   TIMER_COMP(866),   TIMER_COMP(826),   TIMER_COMP(787),
+	TIMER_COMP(750),   TIMER_COMP(715),   TIMER_COMP(682),   TIMER_COMP(650),   TIMER_COMP(619),
+	TIMER_COMP(590),   TIMER_COMP(563),   TIMER_COMP(536),   TIMER_COMP(511),   TIMER_COMP(487),
+	TIMER_COMP(465),   TIMER_COMP(443),   TIMER_COMP(422),   TIMER_COMP(402),   TIMER_COMP(384),
+	TIMER_COMP(366),   TIMER_COMP(349),   TIMER_COMP(332),   TIMER_COMP(317),   TIMER_COMP(302),
+	TIMER_COMP(288),   TIMER_COMP(274),   TIMER_COMP(261),   TIMER_COMP(249),   TIMER_COMP(238),
+	TIMER_COMP(226),   TIMER_COMP(216),   TIMER_COMP(206),   TIMER_COMP(196),   TIMER_COMP(187),
+	TIMER_COMP(178),   TIMER_COMP(170),   TIMER_COMP(162),   TIMER_COMP(154),   TIMER_COMP(147),
+	TIMER_COMP(140),   TIMER_COMP(134),   TIMER_COMP(128),   TIMER_COMP(122),   TIMER_COMP(116),
+	TIMER_COMP(111),   TIMER_COMP(105),   TIMER_COMP(100),   TIMER_COMP(95.4),  TIMER_COMP(90.9),
+	TIMER_COMP(86.6),  TIMER_COMP(82.6),  TIMER_COMP(78.7),  TIMER_COMP(75.0),  TIMER_COMP(71.5),
+	TIMER_COMP(68.2),  TIMER_COMP(65.0),  TIMER_COMP(61.9),  TIMER_COMP(59.0),  TIMER_COMP(56.3),
+	TIMER_COMP(53.6),  TIMER_COMP(51.1)
+};
+
+/** Currently selected SPI driver, either hardware (for fast ISP speeds) or software (for slower ISP speeds). */
+bool HardwareSPIMode = true;
+
+/** Software SPI data register for sending and receiving */
+static volatile uint8_t SoftSPI_Data;
+
+/** Number of bits left to transfer in the software SPI driver */
+static volatile uint8_t SoftSPI_BitsRemaining;
+
+
+/** ISR to handle software SPI transmission and reception */
+ISR(TIMER1_COMPA_vect, ISR_BLOCK)
+{
+	/* Check if rising edge (output next bit) or falling edge (read in next bit) */
+	if (!(PINB & (1 << 1)))
+	{
+		if (SoftSPI_Data & (1 << 7))
+		  PORTB |=  (1 << 2);
+		else
+		  PORTB &= ~(1 << 2);
+	}
+	else
+	{
+		SoftSPI_Data <<= 1;
+
+		if (!(--SoftSPI_BitsRemaining))
+		{
+			TCCR1B = 0;
+			TIFR1  = (1 << OCF1A);
+		}
+
+		if (PINB & (1 << 3))
+		  SoftSPI_Data |= (1 << 0);
+	}
+
+	/* Fast toggle of PORTB.1 via the PIN register (see datasheet) */
+	PINB |= (1 << 1);
+}
+
+/** Initializes the appropriate SPI driver (hardware or software, depending on the selected ISP speed) ready for
+ *  communication with the attached target.
+ */
+void ISPTarget_EnableTargetISP(void)
+{
+	uint8_t SCKDuration = V2Params_GetParameterValue(PARAM_SCK_DURATION);
+
+	if (SCKDuration < sizeof(SPIMaskFromSCKDuration))
+	{
+		HardwareSPIMode = true;
+
+		SPI_Init(pgm_read_byte(&SPIMaskFromSCKDuration[SCKDuration]) | SPI_ORDER_MSB_FIRST |
+		                       SPI_SCK_LEAD_RISING | SPI_SAMPLE_LEADING | SPI_MODE_MASTER);
+	}
+	else
+	{
+		HardwareSPIMode = false;
+
+		DDRB  |= ((1 << 1) | (1 << 2));
+		PORTB |= ((1 << 0) | (1 << 3));
+
+		ISPTarget_ConfigureSoftwareSPI(SCKDuration);
+	}
+}
+
+/** Shuts down the current selected SPI driver (hardware or software, depending on the selected ISP speed) so that no
+ *  further communications can occur until the driver is re-initialized.
+ */
+void ISPTarget_DisableTargetISP(void)
+{
+	if (HardwareSPIMode)
+	{
+		SPI_Disable();
+	}
+	else
+	{
+		DDRB  &= ~((1 << 1) | (1 << 2));
+		PORTB &= ~((1 << 0) | (1 << 3));
+
+		/* Must re-enable rescue clock once software ISP has exited, as the timer for the rescue clock is
+		 * re-purposed for software SPI */
+		ISPTarget_ConfigureRescueClock();
+	}
+}
+
+/** Configures the AVR to produce a 4MHz rescue clock out of the OCR1A pin of the AVR, so
+ *  that it can be fed into the XTAL1 pin of an AVR whose fuses have been mis-configured for
+ *  an external clock rather than a crystal. When used, the ISP speed must be 125KHz for this
+ *  functionality to work correctly.
+ */
+void ISPTarget_ConfigureRescueClock(void)
+{
+	#if defined(XCK_RESCUE_CLOCK_ENABLE)
+		/* Configure XCK as an output for the specified AVR model */
+		DDRD  |= (1 << 5);
+
+		/* Start USART to generate a 4MHz clock on the XCK pin */
+		UBRR1  = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
+		UCSR1B = (1 << TXEN1);
+		UCSR1C = (1 << UMSEL10) | (1 << UPM11) | (1 << USBS1) | (1 << UCSZ11) | (1 << UCSZ10) | (1 << UCPOL1);
+	#else
+		/* Configure OCR1A as an output for the specified AVR model */
+		#if defined(USB_SERIES_2_AVR)
+		DDRC |= (1 << 6);
+		#else
+		DDRB |= (1 << 5);
+		#endif
+
+		/* Start Timer 1 to generate a 4MHz clock on the OCR1A pin */
+		TIMSK1 = 0;
+		TCNT1  = 0;
+		OCR1A  = ((F_CPU / 2 / ISP_RESCUE_CLOCK_SPEED) - 1);
+		TCCR1A = (1 << COM1A0);
+		TCCR1B = ((1 << WGM12) | (1 << CS10));
+	#endif
+}
+
+/** Configures the AVR's timer ready to produce software SPI for the slower ISP speeds that
+ *  cannot be obtained when using the AVR's hardware SPI module.
+ *
+ *  \param[in] SCKDuration  Duration of the desired software ISP SCK clock
+ */
+void ISPTarget_ConfigureSoftwareSPI(const uint8_t SCKDuration)
+{
+	/* Configure Timer 1 for software SPI using the specified SCK duration */
+	TIMSK1 = (1 << OCIE1A);
+	TCNT1  = 0;
+	OCR1A  = pgm_read_word(&TimerCompareFromSCKDuration[SCKDuration - sizeof(SPIMaskFromSCKDuration)]);
+	TCCR1A = 0;
+	TCCR1B = 0;
+}
+
+/** Sends and receives a single byte of data to and from the attached target via software SPI.
+ *
+ *  \param[in] Byte  Byte of data to send to the attached target
+ *
+ *  \return Received byte of data from the attached target
+ */
+uint8_t ISPTarget_TransferSoftSPIByte(const uint8_t Byte)
+{
+	SoftSPI_Data          = Byte;
+	SoftSPI_BitsRemaining = 8;
+
+	/* Set initial MOSI pin state according to the byte to be transferred */
+	if (SoftSPI_Data & (1 << 7))
+	  PORTB |=  (1 << 2);
+	else
+	  PORTB &= ~(1 << 2);
+
+	TCNT1  = 0;
+	TCCR1B = ((1 << WGM12) | (1 << CS11));
+	while (SoftSPI_BitsRemaining && TimeoutTicksRemaining);
+	TCCR1B = 0;
+
+	return SoftSPI_Data;
+}
+
+/** Asserts or deasserts the target's reset line, using the correct polarity as set by the host using a SET PARAM command.
+ *  When not asserted, the line is tristated so as not to interfere with normal device operation.
+ *
+ *  \param[in] ResetTarget  Boolean true when the target should be held in reset, \c false otherwise
+ */
+void ISPTarget_ChangeTargetResetLine(const bool ResetTarget)
+{
+	if (ResetTarget)
+	{
+		AUX_LINE_DDR |= AUX_LINE_MASK;
+
+		if (!(V2Params_GetParameterValue(PARAM_RESET_POLARITY)))
+		  AUX_LINE_PORT |=  AUX_LINE_MASK;
+		else
+		  AUX_LINE_PORT &= ~AUX_LINE_MASK;
+	}
+	else
+	{
+		AUX_LINE_DDR  &= ~AUX_LINE_MASK;
+		AUX_LINE_PORT &= ~AUX_LINE_MASK;
+	}
+}
+
+/** Waits until the target has completed the last operation, by continuously polling the device's
+ *  BUSY flag until it is cleared, or until the command timeout period has expired.
+ *
+ *  \return V2 Protocol status \ref STATUS_CMD_OK if the no timeout occurred, \ref STATUS_RDY_BSY_TOUT otherwise
+ */
+uint8_t ISPTarget_WaitWhileTargetBusy(void)
+{
+	do
+	{
+		ISPTarget_SendByte(0xF0);
+		ISPTarget_SendByte(0x00);
+		ISPTarget_SendByte(0x00);
+	}
+	while ((ISPTarget_ReceiveByte() & 0x01) && TimeoutTicksRemaining);
+
+	return (TimeoutTicksRemaining > 0) ? STATUS_CMD_OK : STATUS_RDY_BSY_TOUT;
+}
+
+/** Sends a low-level LOAD EXTENDED ADDRESS command to the target, for addressing of memory beyond the
+ *  64KB boundary. This sends the command with the correct address as indicated by the current address
+ *  pointer variable set by the host when a SET ADDRESS command is issued.
+ */
+void ISPTarget_LoadExtendedAddress(void)
+{
+	ISPTarget_SendByte(LOAD_EXTENDED_ADDRESS_CMD);
+	ISPTarget_SendByte(0x00);
+	ISPTarget_SendByte(CurrentAddress >> 16);
+	ISPTarget_SendByte(0x00);
+}
+
+/** Waits until the last issued target memory programming command has completed, via the check mode given and using
+ *  the given parameters.
+ *
+ *  \param[in] ProgrammingMode  Programming mode used and completion check to use, a mask of \c PROG_MODE_* constants
+ *  \param[in] PollAddress      Memory address to poll for completion if polling check mode used
+ *  \param[in] PollValue        Poll value to check against if polling check mode used
+ *  \param[in] DelayMS          Milliseconds to delay before returning if delay check mode used
+ *  \param[in] ReadMemCommand   Device low-level READ MEMORY command to send if value check mode used
+ *
+ *  \return V2 Protocol status \ref STATUS_CMD_OK if the no timeout occurred, \ref STATUS_RDY_BSY_TOUT or
+ *          \ref STATUS_CMD_TOUT otherwise
+ */
+uint8_t ISPTarget_WaitForProgComplete(const uint8_t ProgrammingMode,
+                                      const uint16_t PollAddress,
+                                      const uint8_t PollValue,
+                                      const uint8_t DelayMS,
+                                      const uint8_t ReadMemCommand)
+{
+	uint8_t ProgrammingStatus = STATUS_CMD_OK;
+
+	/* Determine method of Programming Complete check */
+	switch (ProgrammingMode & ~(PROG_MODE_PAGED_WRITES_MASK | PROG_MODE_COMMIT_PAGE_MASK))
+	{
+		case PROG_MODE_WORD_TIMEDELAY_MASK:
+		case PROG_MODE_PAGED_TIMEDELAY_MASK:
+			ISPProtocol_DelayMS(DelayMS);
+			break;
+		case PROG_MODE_WORD_VALUE_MASK:
+		case PROG_MODE_PAGED_VALUE_MASK:
+			do
+			{
+				ISPTarget_SendByte(ReadMemCommand);
+				ISPTarget_SendByte(PollAddress >> 8);
+				ISPTarget_SendByte(PollAddress & 0xFF);
+			}
+			while ((ISPTarget_TransferByte(0x00) == PollValue) && TimeoutTicksRemaining);
+
+			if (!(TimeoutTicksRemaining))
+			  ProgrammingStatus = STATUS_CMD_TOUT;
+
+			break;
+		case PROG_MODE_WORD_READYBUSY_MASK:
+		case PROG_MODE_PAGED_READYBUSY_MASK:
+			ProgrammingStatus = ISPTarget_WaitWhileTargetBusy();
+			break;
+	}
+
+	/* Program complete - reset timeout */
+	TimeoutTicksRemaining = COMMAND_TIMEOUT_TICKS;
+
+	return ProgrammingStatus;
+}
+
+#endif
+
diff --git a/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.h b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.h
new file mode 100644
index 0000000000..5f32f51940
--- /dev/null
+++ b/lib/lufa/Projects/AVRISP-MKII/Lib/ISP/ISPTarget.h
@@ -0,0 +1,147 @@
+/*
+             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 ISPTarget.c.
+ */
+
+#ifndef _ISP_TARGET_
+#define _ISP_TARGET_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/pgmspace.h>
+		#include <util/delay.h>
+
+		#include <LUFA/Drivers/USB/USB.h>
+		#include <LUFA/Drivers/Peripheral/SPI.h>
+
+		#include "../V2Protocol.h"
+		#include "ISPProtocol.h"
+		#include "Config/AppConfig.h"
+
+	/* Preprocessor Checks: */
+		#if ((BOARD == BOARD_XPLAIN) || (BOARD == BOARD_XPLAIN_REV1))
+			#undef ENABLE_ISP_PROTOCOL
+
+			#if !defined(ENABLE_XPROG_PROTOCOL)
+				#define ENABLE_XPROG_PROTOCOL
+			#endif
+		#endif
+
+	/* Macros: */
+		/** Low level device command to issue an extended FLASH address, for devices with over 128KB of FLASH. */
+		#define LOAD_EXTENDED_ADDRESS_CMD     0x4D
+
+		/** Macro to convert an ISP frequency to a number of timer clock cycles for the software SPI driver. */
+		#define TIMER_COMP(freq)              (((F_CPU / 8) / 2 / freq) - 1)
+
+		/** ISP rescue clock speed in Hz, for clocking targets with incorrectly set fuses. */
+		#define ISP_RESCUE_CLOCK_SPEED        4000000
+
+	/* External Variables: */
+		extern bool HardwareSPIMode;
+
+	/* Function Prototypes: */
+		void    ISPTarget_EnableTargetISP(void);
+		void    ISPTarget_DisableTargetISP(void);
+		void    ISPTarget_ConfigureRescueClock(void);
+		void    ISPTarget_ConfigureSoftwareSPI(const uint8_t SCKDuration);
+		uint8_t ISPTarget_TransferSoftSPIByte(const uint8_t Byte);
+		void    ISPTarget_ChangeTargetResetLine(const bool ResetTarget);
+		uint8_t ISPTarget_WaitWhileTargetBusy(void);
+		void    ISPTarget_LoadExtendedAddress(void);
+		uint8_t ISPTarget_WaitForProgComplete(const uint8_t ProgrammingMode,
+		                                      const uint16_t PollAddress,
+		                                      const uint8_t PollValue,
+		                                      const uint8_t DelayMS,
+		                                      const uint8_t ReadMemCommand);
+
+	/* Inline Functions: */
+		/** Sends a byte of ISP data to the attached target, using the appropriate SPI hardware or
+		 *  software routines depending on the selected ISP speed.
+		 *
+		 *  \param[in] Byte  Byte of data to send to the attached target
+		 */
+		static inline void ISPTarget_SendByte(const uint8_t Byte)
+		{
+			if (HardwareSPIMode)
+			  SPI_SendByte(Byte);
+			else
+			  ISPTarget_TransferSoftSPIByte(Byte);
+		}
+
+		/** Receives a byte of ISP data from the attached target, using the appropriate
+		 *  SPI hardware or software routines depending on the selected ISP speed.
+		 *
+		 *  \return Received byte of data from the attached target
+		 */
+		static inline uint8_t ISPTarget_ReceiveByte(void)
+		{
+			uint8_t ReceivedByte;
+
+			if (HardwareSPIMode)
+			  ReceivedByte = SPI_ReceiveByte();
+			else
+			  ReceivedByte = ISPTarget_TransferSoftSPIByte(0x00);
+
+			#if defined(INVERTED_ISP_MISO)
+			return ~ReceivedByte;
+			#else
+			return  ReceivedByte;
+			#endif
+		}
+
+		/** Sends and receives a byte of ISP data to and from the attached target, using the
+		 *  appropriate SPI hardware or software routines depending on the selected ISP speed.
+		 *
+		 *  \param[in] Byte  Byte of data to send to the attached target
+		 *
+		 *  \return Received byte of data from the attached target
+		 */
+		static inline uint8_t ISPTarget_TransferByte(const uint8_t Byte)
+		{
+			uint8_t ReceivedByte;
+
+			if (HardwareSPIMode)
+			  ReceivedByte = SPI_TransferByte(Byte);
+			else
+			  ReceivedByte = ISPTarget_TransferSoftSPIByte(Byte);
+
+			#if defined(INVERTED_ISP_MISO)
+			return ~ReceivedByte;
+			#else
+			return  ReceivedByte;
+			#endif
+		}
+
+#endif
+