Squashed 'lib/lufa/' content from commit 385d40300

git-subtree-dir: lib/lufa
git-subtree-split: 385d4030035dbaf41591309dbde47653bd03841b

13 files changed, 3793 insertions, 0 deletions

diff --git a/Projects/XPLAINBridge/Config/AppConfig.h b/Projects/XPLAINBridge/Config/AppConfig.h
new file mode 100644
index 0000000000..ce9caaf616
--- /dev/null
+++ b/Projects/XPLAINBridge/Config/AppConfig.h
@@ -0,0 +1,64 @@
+/*
+             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
+ *  \brief Application Configuration Header File
+ *
+ *  This is a header file which is be used to configure some of
+ *  the application's compile time options, as an alternative to
+ *  specifying the compile time constants supplied through a
+ *  makefile or build system.
+ *
+ *  For information on what each token does, refer to the
+ *  \ref Sec_Options section of the application documentation.
+ */
+
+#ifndef _APP_CONFIG_H_
+#define _APP_CONFIG_H_
+
+	#define AUX_LINE_PORT              PORTB
+	#define AUX_LINE_PIN               PINB
+	#define AUX_LINE_DDR               DDRB
+	#define AUX_LINE_MASK              (1 << 4)
+
+//	#define ENABLE_ISP_PROTOCOL
+	#define ENABLE_XPROG_PROTOCOL
+
+	#define VTARGET_ADC_CHANNEL        2
+	#define VTARGET_REF_VOLTS          3.3
+	#define VTARGET_SCALE_FACTOR       2
+//	#define VTARGET_USE_INTERNAL_REF
+//	#define NO_VTARGET_DETECT
+//	#define XCK_RESCUE_CLOCK_ENABLE
+//	#define INVERTED_ISP_MISO
+
+//	#define FIRMWARE_VERSION_MINOR     0x11
+
+#endif
diff --git a/Projects/XPLAINBridge/Config/LUFAConfig.h b/Projects/XPLAINBridge/Config/LUFAConfig.h
new file mode 100644
index 0000000000..2767f33e32
--- /dev/null
+++ b/Projects/XPLAINBridge/Config/LUFAConfig.h
@@ -0,0 +1,93 @@
+/*
+             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
+ *  \brief LUFA Library Configuration Header File
+ *
+ *  This header file is used to configure LUFA's compile time options,
+ *  as an alternative to the compile time constants supplied through
+ *  a makefile.
+ *
+ *  For information on what each token does, refer to the LUFA
+ *  manual section "Summary of Compile Tokens".
+ */
+
+#ifndef _LUFA_CONFIG_H_
+#define _LUFA_CONFIG_H_
+
+	#if (ARCH == ARCH_AVR8)
+
+		/* Non-USB Related Configuration Tokens: */
+//		#define DISABLE_TERMINAL_CODES
+
+		/* USB Class Driver Related Tokens: */
+//		#define HID_HOST_BOOT_PROTOCOL_ONLY
+//		#define HID_STATETABLE_STACK_DEPTH       {Insert Value Here}
+//		#define HID_USAGE_STACK_DEPTH            {Insert Value Here}
+//		#define HID_MAX_COLLECTIONS              {Insert Value Here}
+//		#define HID_MAX_REPORTITEMS              {Insert Value Here}
+//		#define HID_MAX_REPORT_IDS               {Insert Value Here}
+//		#define NO_CLASS_DRIVER_AUTOFLUSH
+
+		/* General USB Driver Related Tokens: */
+		#define ORDERED_EP_CONFIG
+		#define USE_STATIC_OPTIONS               (USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENABLED | USB_OPT_AUTO_PLL)
+		#define USB_DEVICE_ONLY
+//		#define USB_HOST_ONLY
+//		#define USB_STREAM_TIMEOUT_MS            {Insert Value Here}
+//		#define NO_LIMITED_CONTROLLER_CONNECT
+		#define NO_SOF_EVENTS
+
+		/* USB Device Mode Driver Related Tokens: */
+//		#define USE_RAM_DESCRIPTORS
+		#define USE_FLASH_DESCRIPTORS
+//		#define USE_EEPROM_DESCRIPTORS
+//		#define NO_INTERNAL_SERIAL
+		#define FIXED_CONTROL_ENDPOINT_SIZE      16
+		#define DEVICE_STATE_AS_GPIOR            0
+		#define FIXED_NUM_CONFIGURATIONS         1
+//		#define CONTROL_ONLY_DEVICE
+//		#define INTERRUPT_CONTROL_ENDPOINT
+		#define NO_DEVICE_REMOTE_WAKEUP
+		#define NO_DEVICE_SELF_POWER
+
+		/* USB Host Mode Driver Related Tokens: */
+//		#define HOST_STATE_AS_GPIOR              {Insert Value Here}
+//		#define USB_HOST_TIMEOUT_MS              {Insert Value Here}
+//		#define HOST_DEVICE_SETTLE_DELAY_MS	     {Insert Value Here}
+//		#define NO_AUTO_VBUS_MANAGEMENT
+//		#define INVERTED_VBUS_ENABLE_LINE
+
+	#else
+
+		#error Unsupported architecture for this LUFA configuration file.
+
+	#endif
+#endif
diff --git a/Projects/XPLAINBridge/LUFA XPLAIN Bridge.inf b/Projects/XPLAINBridge/LUFA XPLAIN Bridge.inf
new file mode 100644
index 0000000000..45840e8bf0
--- /dev/null
+++ b/Projects/XPLAINBridge/LUFA XPLAIN Bridge.inf
@@ -0,0 +1,66 @@
+;************************************************************
+; Windows USB CDC ACM Setup File
+; Copyright (c) 2000 Microsoft Corporation
+;************************************************************
+
+[DefaultInstall]
+CopyINF="LUFA XPLAIN Bridge.inf"
+
+[Version]
+Signature="$Windows NT$"
+Class=Ports
+ClassGuid={4D36E978-E325-11CE-BFC1-08002BE10318}
+Provider=%MFGNAME%
+DriverVer=7/1/2012,10.0.0.0
+
+[Manufacturer]
+%MFGNAME%=DeviceList, NTx86, NTamd64, NTia64
+
+[SourceDisksNames]
+
+[SourceDisksFiles]
+
+[DestinationDirs]
+DefaultDestDir=12
+
+[DriverInstall]
+Include=mdmcpq.inf
+CopyFiles=FakeModemCopyFileSection
+AddReg=DriverInstall.AddReg
+
+[DriverInstall.Services]
+Include=mdmcpq.inf
+AddService=usbser, 0x00000002, LowerFilter_Service_Inst
+
+[DriverInstall.AddReg]
+HKR,,EnumPropPages32,,"msports.dll,SerialPortPropPageProvider"
+
+;------------------------------------------------------------------------------
+;  Vendor and Product ID Definitions
+;------------------------------------------------------------------------------
+; When developing your USB device, the VID and PID used in the PC side
+; application program and the firmware on the microcontroller must match.
+; Modify the below line to use your VID and PID.  Use the format as shown below.
+; Note: One INF file can be used for multiple devices with different VID and PIDs.
+; For each supported device, append ",USB\VID_xxxx&PID_yyyy" to the end of the line.
+;------------------------------------------------------------------------------
+[DeviceList]
+%DESCRIPTION%=DriverInstall, USB\VID_03EB&PID_204B
+
+[DeviceList.NTx86]
+%DESCRIPTION%=DriverInstall, USB\VID_03EB&PID_204B
+
+[DeviceList.NTamd64]
+%DESCRIPTION%=DriverInstall, USB\VID_03EB&PID_204B
+
+[DeviceList.NTia64]
+%DESCRIPTION%=DriverInstall, USB\VID_03EB&PID_204B
+
+;------------------------------------------------------------------------------
+;  String Definitions
+;------------------------------------------------------------------------------
+;Modify these strings to customize your device
+;------------------------------------------------------------------------------
+[Strings]
+MFGNAME="http://www.lufa-lib.org"
+DESCRIPTION="LUFA XPLAIN Bridge"
\ No newline at end of file
diff --git a/Projects/XPLAINBridge/Lib/SoftUART.c b/Projects/XPLAINBridge/Lib/SoftUART.c
new file mode 100644
index 0000000000..5c0e3c8cd9
--- /dev/null
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -0,0 +1,156 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2010  David Prentice (david.prentice [at] farming [dot] uk)
+  Copyright 2010  Peter Danneger
+  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
+ *
+ *  Software UART for both data transmission and reception. This
+ *  code continuously monitors the ring buffers set up by the main
+ *  project source file and reads/writes data as it becomes available.
+ */
+
+#include "SoftUART.h"
+
+/** Total number of bits remaining to be sent in the current frame */
+static uint8_t TX_BitsRemaining;
+
+/** Temporary data variable to hold the byte being transmitted as it is shifted out */
+static uint8_t TX_Data;
+
+/** Total number of bits remaining to be received in the current frame */
+static uint8_t RX_BitsRemaining;
+
+/** Temporary data variable to hold the byte being received as it is shifted in */
+static uint8_t RX_Data;
+
+
+/** Initializes the software UART, ready for data transmission and reception into the global ring buffers. */
+void SoftUART_Init(void)
+{
+	/* Set TX pin to output high, enable RX pull-up */
+	STXPORT |= (1 << STX);
+	STXDDR  |= (1 << STX);
+	SRXPORT |= (1 << SRX);
+
+	/* Enable INT0 for the detection of incoming start bits that signal the start of a byte */
+	EICRA  = (1 << ISC01);
+	EIMSK  = (1 << INT0);
+
+	/* Set the transmission and reception timer compare values for the default baud rate */
+	SoftUART_SetBaud(9600);
+
+	/* Setup reception timer compare ISR */
+	TIMSK1 = (1 << OCIE1A);
+
+	/* Setup transmission timer compare ISR and start the timer */
+	TIMSK3 = (1 << OCIE3A);
+	TCCR3B = ((1 << CS30) | (1 << WGM32));
+}
+
+/** ISR to detect the start of a bit being sent to the software UART. */
+ISR(INT0_vect, ISR_BLOCK)
+{
+	/* Reset the number of reception bits remaining counter */
+	RX_BitsRemaining = 8;
+
+	/* Reset the bit reception timer to -(1/2) of the total bit time, so that the first data bit is
+	 * sampled mid way through the total bit time, making reception more robust.
+	 */
+	TCNT1 = -(OCR1A >> 1);
+
+	/* Check to see that the pin is still low (prevents glitches from starting a frame reception) */
+	if (!(SRXPIN & (1 << SRX)))
+	{
+		/* Disable start bit detection ISR while the next byte is received */
+		EIMSK = 0;
+
+		/* Start the reception timer */
+		TCCR1B = ((1 << CS10) | (1 << WGM12));
+	}
+}
+
+/** ISR to manage the reception of bits to the software UART. */
+ISR(TIMER1_COMPA_vect, ISR_BLOCK)
+{
+	/* Cache the current RX pin value for later checking */
+	uint8_t SRX_Cached = (SRXPIN & (1 << SRX));
+
+	/* Check if reception has finished */
+	if (RX_BitsRemaining)
+	{
+		/* Shift the current received bit mask to the next bit position */
+		RX_Data >>= 1;
+		RX_BitsRemaining--;
+
+		/* Store next bit into the received data variable */
+		if (SRX_Cached)
+		  RX_Data |= (1 << 7);
+	}
+	else
+	{
+		/* Disable the reception timer as all data has now been received, re-enable start bit detection ISR */
+		TCCR1B = 0;
+		EIFR   = (1 << INTF0);
+		EIMSK  = (1 << INT0);
+
+		/* Reception complete, store the received byte if stop bit valid */
+		if (SRX_Cached)
+		  RingBuffer_Insert(&UARTtoUSB_Buffer, RX_Data);
+	}
+}
+
+/** ISR to manage the transmission of bits via the software UART. */
+ISR(TIMER3_COMPA_vect, ISR_BLOCK)
+{
+	/* Check if transmission has finished */
+	if (TX_BitsRemaining)
+	{
+		/* Set the TX line to the value of the next bit in the byte to send */
+		if (TX_Data & (1 << 0))
+		  STXPORT &= ~(1 << STX);
+		else
+		  STXPORT |=  (1 << STX);
+
+		/* Shift the transmission byte to move the next bit into position and decrement the bits remaining counter */
+		TX_Data >>= 1;
+		TX_BitsRemaining--;
+	}
+	else if (!(RX_BitsRemaining) && !(RingBuffer_IsEmpty(&USBtoUART_Buffer)))
+	{
+		/* Start bit - TX line low */
+		STXPORT &= ~(1 << STX);
+
+		/* Transmission complete, get the next byte to send (if available) */
+		TX_Data          = ~RingBuffer_Remove(&USBtoUART_Buffer);
+		TX_BitsRemaining = 9;
+	}
+}
+
diff --git a/Projects/XPLAINBridge/Lib/SoftUART.h b/Projects/XPLAINBridge/Lib/SoftUART.h
new file mode 100644
index 0000000000..b273967814
--- /dev/null
+++ b/Projects/XPLAINBridge/Lib/SoftUART.h
@@ -0,0 +1,71 @@
+/*
+             LUFA Library
+     Copyright (C) Dean Camera, 2017.
+
+  dean [at] fourwalledcubicle [dot] com
+           www.lufa-lib.org
+*/
+
+/*
+  Copyright 2010  David Prentice (david.prentice [at] farming [dot] uk)
+  Copyright 2010  Peter Danneger
+  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 SoftUART.c.
+ */
+
+#ifndef _SOFT_UART_
+#define _SOFT_UART_
+
+	/* Includes: */
+		#include <avr/io.h>
+		#include <avr/interrupt.h>
+		#include <stdbool.h>
+
+		#include "../XPLAINBridge.h"
+		#include "Config/AppConfig.h"
+
+	/* Macros: */
+		#define SRX        PD0
+		#define SRXPIN     PIND
+		#define SRXPORT    PORTD
+
+		#define STX        PD1
+		#define STXPORT    PORTD
+		#define STXDDR     DDRD
+
+	/* Inline Functions: */
+		static inline void SoftUART_SetBaud(const uint32_t Baud)
+		{
+			uint16_t BitTime = ((F_CPU / Baud) - 1);
+
+			OCR1A = BitTime;
+			OCR3A = BitTime;
+		}
+
+	/* Function Prototypes: */
+		void SoftUART_Init(void);
+
+#endif
+
diff --git a/Projects/XPLAINBridge/USARTDescriptors.c b/Projects/XPLAINBridge/USARTDescriptors.c
new file mode 100644
index 0000000000..54f0d96fe6
--- /dev/null
+++ b/Projects/XPLAINBridge/USARTDescriptors.c
@@ -0,0 +1,242 @@
+/*
+             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
+ *
+ *  USB Device Descriptors, for library use when in USB device mode. Descriptors are special
+ *  computer-readable structures which the host requests upon device enumeration, to determine
+ *  the device's capabilities and functions.
+ */
+
+#include "USARTDescriptors.h"
+
+
+/** Device descriptor structure. This descriptor, located in FLASH memory, describes the overall
+ *  device characteristics, including the supported USB version, control endpoint size and the
+ *  number of device configurations. The descriptor is read out by the USB host when the enumeration
+ *  process begins.
+ */
+const USB_Descriptor_Device_t PROGMEM USART_DeviceDescriptor =
+{
+	.Header                 = {.Size = sizeof(USB_Descriptor_Device_t), .Type = DTYPE_Device},
+
+	.USBSpecification       = VERSION_BCD(1,1,0),
+	.Class                  = CDC_CSCP_CDCClass,
+	.SubClass               = CDC_CSCP_NoSpecificSubclass,
+	.Protocol               = CDC_CSCP_NoSpecificProtocol,
+
+	.Endpoint0Size          = FIXED_CONTROL_ENDPOINT_SIZE,
+
+	.VendorID               = 0x03EB,
+	.ProductID              = 0x204B,
+	.ReleaseNumber          = VERSION_BCD(0,0,1),
+
+	.ManufacturerStrIndex   = USART_STRING_ID_Manufacturer,
+	.ProductStrIndex        = USART_STRING_ID_Product,
+	.SerialNumStrIndex      = USE_INTERNAL_SERIAL,
+
+	.NumberOfConfigurations = FIXED_NUM_CONFIGURATIONS
+};
+
+/** Configuration descriptor structure. This descriptor, located in FLASH memory, describes the usage
+ *  of the device in one of its supported configurations, including information about any device interfaces
+ *  and endpoints. The descriptor is read out by the USB host during the enumeration process when selecting
+ *  a configuration so that the host may correctly communicate with the USB device.
+ */
+const USART_USB_Descriptor_Configuration_t PROGMEM USART_ConfigurationDescriptor =
+{
+	.Config =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Configuration_Header_t), .Type = DTYPE_Configuration},
+
+			.TotalConfigurationSize = sizeof(USART_USB_Descriptor_Configuration_t),
+			.TotalInterfaces        = 2,
+
+			.ConfigurationNumber    = 1,
+			.ConfigurationStrIndex  = NO_DESCRIPTOR,
+
+			.ConfigAttributes       = USB_CONFIG_ATTR_RESERVED,
+
+			.MaxPowerConsumption    = USB_CONFIG_POWER_MA(100)
+		},
+
+	.CDC_CCI_Interface =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
+
+			.InterfaceNumber        = INTERFACE_ID_CDC_CCI,
+			.AlternateSetting       = 0,
+
+			.TotalEndpoints         = 1,
+
+			.Class                  = CDC_CSCP_CDCClass,
+			.SubClass               = CDC_CSCP_ACMSubclass,
+			.Protocol               = CDC_CSCP_ATCommandProtocol,
+
+			.InterfaceStrIndex      = NO_DESCRIPTOR
+		},
+
+	.CDC_Functional_Header =
+		{
+			.Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalHeader_t), .Type = DTYPE_CSInterface},
+			.Subtype                = CDC_DSUBTYPE_CSInterface_Header,
+
+			.CDCSpecification       = VERSION_BCD(1,1,0),
+		},
+
+	.CDC_Functional_ACM =
+		{
+			.Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalACM_t), .Type = DTYPE_CSInterface},
+			.Subtype                = CDC_DSUBTYPE_CSInterface_ACM,
+
+			.Capabilities           = 0x06,
+		},
+
+	.CDC_Functional_Union =
+		{
+			.Header                 = {.Size = sizeof(USB_CDC_Descriptor_FunctionalUnion_t), .Type = DTYPE_CSInterface},
+			.Subtype                = CDC_DSUBTYPE_CSInterface_Union,
+
+			.MasterInterfaceNumber  = INTERFACE_ID_CDC_CCI,
+			.SlaveInterfaceNumber   = INTERFACE_ID_CDC_DCI,
+		},
+
+	.CDC_NotificationEndpoint =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
+
+			.EndpointAddress        = CDC_NOTIFICATION_EPADDR,
+			.Attributes             = (EP_TYPE_INTERRUPT | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
+			.EndpointSize           = CDC_NOTIFICATION_EPSIZE,
+			.PollingIntervalMS      = 0xFF
+		},
+
+	.CDC_DCI_Interface =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Interface_t), .Type = DTYPE_Interface},
+
+			.InterfaceNumber        = INTERFACE_ID_CDC_DCI,
+			.AlternateSetting       = 0,
+
+			.TotalEndpoints         = 2,
+
+			.Class                  = CDC_CSCP_CDCDataClass,
+			.SubClass               = CDC_CSCP_NoDataSubclass,
+			.Protocol               = CDC_CSCP_NoDataProtocol,
+
+			.InterfaceStrIndex      = NO_DESCRIPTOR
+		},
+
+	.CDC_DataOutEndpoint =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
+
+			.EndpointAddress        = CDC_RX_EPADDR,
+			.Attributes             = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
+			.EndpointSize           = CDC_TXRX_EPSIZE,
+			.PollingIntervalMS      = 0x05
+		},
+
+	.CDC_DataInEndpoint =
+		{
+			.Header                 = {.Size = sizeof(USB_Descriptor_Endpoint_t), .Type = DTYPE_Endpoint},
+
+			.EndpointAddress        = CDC_TX_EPADDR,
+			.Attributes             = (EP_TYPE_BULK | ENDPOINT_ATTR_NO_SYNC | ENDPOINT_USAGE_DATA),
+			.EndpointSize           = CDC_TXRX_EPSIZE,
+			.PollingIntervalMS      = 0x05
+		}
+};
+
+/** Language descriptor structure. This descriptor, located in FLASH memory, is returned when the host requests
+ *  the string descriptor with index 0 (the first index). It is actually an array of 16-bit integers, which indicate
+ *  via the language ID table available at USB.org what languages the device supports for its string descriptors.
+ */
+const USB_Descriptor_String_t PROGMEM USART_LanguageString = USB_STRING_DESCRIPTOR_ARRAY(LANGUAGE_ID_ENG);
+
+/** Manufacturer descriptor string. This is a Unicode string containing the manufacturer's details in human readable
+ *  form, and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
+ *  Descriptor.
+ */
+const USB_Descriptor_String_t PROGMEM USART_ManufacturerString = USB_STRING_DESCRIPTOR(L"Dean Camera");
+
+/** Product descriptor string. This is a Unicode string containing the product's details in human readable form,
+ *  and is read out upon request by the host when the appropriate string ID is requested, listed in the Device
+ *  Descriptor.
+ */
+const USB_Descriptor_String_t PROGMEM USART_ProductString = USB_STRING_DESCRIPTOR(L"LUFA XPLAIN Bridge");
+
+/** Descriptor retrieval function for the USART Bridge descriptors. This function is in turn called by the GetDescriptor
+ *  callback function in the main source file, to retrieve the device's descriptors when in USART bridge mode.
+ */
+uint16_t USART_GetDescriptor(const uint16_t wValue,
+                             const uint16_t wIndex,
+                             const void** const DescriptorAddress)
+{
+	const uint8_t  DescriptorType   = (wValue >> 8);
+	const uint8_t  DescriptorNumber = (wValue & 0xFF);
+
+	const void* Address = NULL;
+	uint16_t    Size    = NO_DESCRIPTOR;
+
+	switch (DescriptorType)
+	{
+		case DTYPE_Device:
+			Address = &USART_DeviceDescriptor;
+			Size    = sizeof(USB_Descriptor_Device_t);
+			break;
+		case DTYPE_Configuration:
+			Address = &USART_ConfigurationDescriptor;
+			Size    = sizeof(USART_USB_Descriptor_Configuration_t);
+			break;
+		case DTYPE_String:
+			switch (DescriptorNumber)
+			{
+				case USART_STRING_ID_Language:
+					Address = &USART_LanguageString;
+					Size    = pgm_read_byte(&USART_LanguageString.Header.Size);
+					break;
+				case USART_STRING_ID_Manufacturer:
+					Address = &USART_ManufacturerString;
+					Size    = pgm_read_byte(&USART_ManufacturerString.Header.Size);
+					break;
+				case USART_STRING_ID_Product:
+					Address = &USART_ProductString;
+					Size    = pgm_read_byte(&USART_ProductString.Header.Size);
+					break;
+			}
+
+			break;
+	}
+
+	*DescriptorAddress = Address;
+	return Size;
+}
+
diff --git a/Projects/XPLAINBridge/USARTDescriptors.h b/Projects/XPLAINBridge/USARTDescriptors.h
new file mode 100644
index 0000000000..4f165a1e16
--- /dev/null
+++ b/Projects/XPLAINBridge/USARTDescriptors.h
@@ -0,0 +1,111 @@
+/*
+             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 USARTDescriptors.c.
+ */
+
+#ifndef _USART_DESCRIPTORS_H_
+#define _USART_DESCRIPTORS_H_
+
+	/* Includes: */
+		#include <avr/pgmspace.h>
+
+		#include <LUFA/Drivers/USB/USB.h>
+
+		#include "Config/AppConfig.h"
+
+	/* Macros: */
+		/** Endpoint address of the CDC device-to-host notification IN endpoint. */
+		#define CDC_NOTIFICATION_EPADDR        (ENDPOINT_DIR_IN  | 2)
+
+		/** Endpoint address of the CDC device-to-host data IN endpoint. */
+		#define CDC_TX_EPADDR                  (ENDPOINT_DIR_IN  | 3)
+
+		/** Endpoint address of the CDC host-to-device data OUT endpoint. */
+		#define CDC_RX_EPADDR                  (ENDPOINT_DIR_OUT | 4)
+
+		/** Size in bytes of the CDC device-to-host notification IN endpoint. */
+		#define CDC_NOTIFICATION_EPSIZE        8
+
+		/** Size in bytes of the CDC data IN and OUT endpoints. */
+		#define CDC_TXRX_EPSIZE                16
+
+	/* Type Defines: */
+		/** Type define for the device configuration descriptor structure. This must be defined in the
+		 *  application code, as the configuration descriptor contains several sub-descriptors which
+		 *  vary between devices, and which describe the device's usage to the host.
+		 */
+		typedef struct
+		{
+			USB_Descriptor_Configuration_Header_t    Config;
+
+			// CDC Control Interface
+			USB_Descriptor_Interface_t               CDC_CCI_Interface;
+			USB_CDC_Descriptor_FunctionalHeader_t    CDC_Functional_Header;
+			USB_CDC_Descriptor_FunctionalACM_t       CDC_Functional_ACM;
+			USB_CDC_Descriptor_FunctionalUnion_t     CDC_Functional_Union;
+			USB_Descriptor_Endpoint_t                CDC_NotificationEndpoint;
+
+			// CDC Data Interface
+			USB_Descriptor_Interface_t               CDC_DCI_Interface;
+			USB_Descriptor_Endpoint_t                CDC_DataOutEndpoint;
+			USB_Descriptor_Endpoint_t                CDC_DataInEndpoint;
+		} USART_USB_Descriptor_Configuration_t;
+
+		/** Enum for the device interface descriptor IDs within the device. Each interface descriptor
+		 *  should have a unique ID index associated with it, which can be used to refer to the
+		 *  interface from other descriptors.
+		 */
+		enum USART_InterfaceDescriptors_t
+		{
+			INTERFACE_ID_CDC_CCI = 0, /**< CDC CCI interface descriptor ID */
+			INTERFACE_ID_CDC_DCI = 1, /**< CDC DCI interface descriptor ID */
+		};
+
+		/** Enum for the device string descriptor IDs within the device. Each string descriptor should
+		 *  have a unique ID index associated with it, which can be used to refer to the string from
+		 *  other descriptors.
+		 */
+		enum USART_StringDescriptors_t
+		{
+			USART_STRING_ID_Language     = 0, /**< Supported Languages string descriptor ID (must be zero) */
+			USART_STRING_ID_Manufacturer = 1, /**< Manufacturer string ID */
+			USART_STRING_ID_Product      = 2, /**< Product string ID */
+		};
+
+	/* Function Prototypes: */
+		uint16_t USART_GetDescriptor(const uint16_t wValue,
+		                             const uint16_t wIndex,
+		                             const void** const DescriptorAddress);
+
+#endif
+
diff --git a/Projects/XPLAINBridge/XPLAINBridge.c b/Projects/XPLAINBridge/XPLAINBridge.c
new file mode 100644
index 0000000000..d901af819c
--- /dev/null
+++ b/Projects/XPLAINBridge/XPLAINBridge.c
@@ -0,0 +1,292 @@
+/*
+             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 XPLAINBridge project. This file contains the main tasks of
+ *  the project and is responsible for the initial application hardware configuration.
+ */
+
+#include "XPLAINBridge.h"
+
+/** Current firmware mode, making the device behave as either a programmer or a USART bridge */
+bool CurrentFirmwareMode = MODE_USART_BRIDGE;
+
+/** LUFA CDC Class driver interface configuration and state information. This structure is
+ *  passed to all CDC Class driver functions, so that multiple instances of the same class
+ *  within a device can be differentiated from one another.
+ */
+USB_ClassInfo_CDC_Device_t VirtualSerial_CDC_Interface =
+	{
+		.Config =
+			{
+				.ControlInterfaceNumber         = INTERFACE_ID_CDC_CCI,
+				.DataINEndpoint                 =
+					{
+						.Address                = CDC_TX_EPADDR,
+						.Size                   = CDC_TXRX_EPSIZE,
+						.Banks                  = 1,
+					},
+				.DataOUTEndpoint                =
+					{
+						.Address                = CDC_RX_EPADDR,
+						.Size                   = CDC_TXRX_EPSIZE,
+						.Banks                  = 1,
+					},
+				.NotificationEndpoint           =
+					{
+						.Address                = CDC_NOTIFICATION_EPADDR,
+						.Size                   = CDC_NOTIFICATION_EPSIZE,
+						.Banks                  = 1,
+					},
+			},
+	};
+
+/** Circular buffer to hold data from the host before it is sent to the device via the serial port. */
+RingBuffer_t   USBtoUART_Buffer;
+
+/** Underlying data buffer for \ref USBtoUART_Buffer, where the stored bytes are located. */
+static uint8_t USBtoUART_Buffer_Data[128];
+
+/** Circular buffer to hold data from the serial port before it is sent to the host