diff --git a/LUFA.pnproj b/LUFA.pnproj
index c608e8dfc5..de32cdbd3f 100644
--- a/LUFA.pnproj
+++ b/LUFA.pnproj
@@ -1 +1 @@
-
\ No newline at end of file
+
\ 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..390e6d59b5
--- /dev/null
+++ b/Projects/XPLAINBridge/Lib/SoftUART.c
@@ -0,0 +1,143 @@
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 David Prentice (david.prentice [at] farming [dot] uk)
+ Copyright 2009 Peter Danneger
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, 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 disclaim 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.
+*/
+
+#include "SoftUART.h"
+
+volatile uint8_t srx_done, stx_count;
+volatile uint8_t srx_data, srx_mask, srx_tmp, stx_data;
+
+unsigned char SoftUART_IsReady(void)
+{
+ return !(stx_count);
+}
+
+unsigned char SoftUART_TxByte(unsigned char c)
+{
+ while (stx_count);
+
+ stx_data = ~c;
+ stx_count = 10;
+
+ return c;
+}
+
+unsigned char SoftUART_IsReceived(void)
+{
+ return srx_done;
+}
+
+unsigned char SoftUART_RxByte(void)
+{
+ while (!(srx_done));
+
+ srx_done = 0;
+
+ return srx_data;
+}
+
+void SoftUART_Init(void)
+{
+ OCR2B = TCNT2 + 1; // force first compare
+ TCCR2A = (1 << COM2B1) | (1 << COM2B0); // T1 mode 0
+ TCCR2B = (1 << FOC2B) | (1 << CS21); // CLK/8, T1 mode 0
+ TIMSK2 = (1 << OCIE2B); // enable tx and wait for start
+ EICRA = (1 << ISC01); // -ve edge
+ EIMSK = (1 << INT0); // enable INT0 interrupt
+
+ stx_count = 0; // nothing to send
+ srx_done = 0; // nothing received
+ STXPORT |= 1 << STX; // TX output
+ STXDDR |= 1 << STX; // TX output
+ SRXPORT |= (1 << SRX); // pullup on INT0
+}
+
+/* ISR to detect the start of a bit being sent from the transmitter. */
+ISR(INT0_vect)
+{
+ OCR2A = TCNT2 + (BIT_TIME / 8 * 3 / 2); // scan 1.5 bits after start
+
+ srx_tmp = 0; // clear bit storage
+ srx_mask = 1; // bit mask
+
+ TIFR2 = (1 << OCF2A); // clear pending interrupt
+
+ if (!(SRXPIN & (1 << SRX))) // still low
+ {
+ TIMSK2 = (1 << OCIE2A) | (1 << OCIE2B); // wait for first bit
+ EIMSK &= ~(1 << INT0);
+ }
+}
+
+/* ISR to manage the reception of bits to the transmitter. */
+ISR(TIMER2_COMPA_vect)
+{
+ if (srx_mask)
+ {
+ if (SRXPIN & (1 << SRX))
+ srx_tmp |= srx_mask;
+
+ srx_mask <<= 1;
+
+ OCR2A += BIT_TIME / 8; // next bit slice
+ }
+ else
+ {
+ srx_done = 1; // mark rx data valid
+ srx_data = srx_tmp; // store rx data
+ TIMSK2 = (1 << OCIE2B); // enable tx and wait for start
+ EIMSK |= (1 << INT0); // enable START irq
+ EIFR = (1 << INTF0); // clear any pending
+ }
+}
+
+/* ISR to manage the transmission of bits to the receiver. */
+ISR(TIMER2_COMPB_vect)
+{
+ OCR2B += BIT_TIME / 8; // next bit slice
+
+ if (stx_count)
+ {
+ if (--stx_count != 9) // no start bit
+ {
+ if (!(stx_data & 1)) // test inverted data
+ TCCR2A = (1 << COM2B1) | (1 << COM2B0);
+ else
+ TCCR2A = (1 << COM2B1);
+
+ stx_data >>= 1; // shift zero in from left
+ }
+ else
+ {
+ TCCR2A = (1 << COM2B1); // START bit
+ }
+ }
+}
diff --git a/Projects/XPLAINBridge/Lib/SoftUART.h b/Projects/XPLAINBridge/Lib/SoftUART.h
new file mode 100644
index 0000000000..844c8960ec
--- /dev/null
+++ b/Projects/XPLAINBridge/Lib/SoftUART.h
@@ -0,0 +1,60 @@
+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 David Prentice (david.prentice [at] farming [dot] uk)
+ Copyright 2009 Peter Danneger
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, 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 disclaim 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.
+*/
+
+#ifndef _SOFT_UART_
+#define _SOFT_UART_
+
+ /* Includes: */
+ #include
+ #include
+ #include "SoftUART.h"
+
+ /* Macros: */
+ #define BAUD 9600
+ #define BIT_TIME (uint16_t)((F_CPU + (BAUD / 2)) / BAUD)
+
+ #define SRX PD0
+ #define SRXPIN PIND
+ #define SRXPORT PORTD
+
+ #define STX PD1
+ #define STXPORT PORTD
+ #define STXDDR DDRD
+
+ /* Function Prototypes: */
+ unsigned char SoftUART_IsReady(void);
+ unsigned char SoftUART_TxByte(unsigned char c);
+ unsigned char SoftUART_IsReceived(void);
+ unsigned char SoftUART_RxByte(void);
+ void SoftUART_Init(void);
+
+#endif
\ No newline at end of file
diff --git a/Projects/XPLAINBridge/makefile b/Projects/XPLAINBridge/makefile
index b6b6cc1024..fc7244ff4a 100644
--- a/Projects/XPLAINBridge/makefile
+++ b/Projects/XPLAINBridge/makefile
@@ -127,6 +127,7 @@ LUFA_OPTS += -D USE_STATIC_OPTIONS="(USB_DEVICE_OPT_FULLSPEED | USB_OPT_REG_ENAB
SRC = $(TARGET).c \
Descriptors.c \
Lib/RingBuff.c \
+ Lib/SoftUART.c \
$(LUFA_PATH)/LUFA/Drivers/USB/LowLevel/DevChapter9.c \
$(LUFA_PATH)/LUFA/Drivers/USB/LowLevel/Endpoint.c \
$(LUFA_PATH)/LUFA/Drivers/USB/LowLevel/Host.c \
@@ -152,7 +153,7 @@ CPPSRC =
# Even though the DOS/Win* filesystem matches both .s and .S the same,
# it will preserve the spelling of the filenames, and gcc itself does
# care about how the name is spelled on its command-line.
-ASRC = Lib/SoftUART.S
+ASRC =
# Optimization level, can be [0, 1, 2, 3, s].