diff --git a/converter/ps2_usb/Makefile b/converter/ps2_usb/Makefile
index 1dd23c1..f20039c 100644
--- a/converter/ps2_usb/Makefile
+++ b/converter/ps2_usb/Makefile
@@ -91,6 +91,19 @@ PS2_USE_USART = yes # uses hardware USART engine for PS/2 signal receive(recomen
#PS2_USE_INT = yes # uses external interrupt for falling edge of PS/2 clock pin
#PS2_USE_BUSYWAIT = yes # uses primitive reference code
+# Serial Mouse Options
+# You can choose a mouse protocol and the implementation of
+# the underlying serial connection.
+#
+#SERIAL_MOUSE_MICROSOFT_ENABLE = yes # Enable support for Microsoft-compatible mice
+#SERIAL_MOUSE_MOUSESYSTEMS_ENABLE = yes # Enable support for Mousesystems-compatible mice
+#SERIAL_MOUSE_USE_UART = yes # use hardware UART for serial connection
+#SERIAL_MOUSE_USE_SOFT = yes # use software serial implementation
+
+# Optional serial mouse driver features
+# Support scrolling while holding the middle mouse button
+# (currently only supported for Mousesystems mice):
+#OPT_DEFS += -DSERIAL_MOUSE_CENTER_SCROLL
# Optimize size but this may cause error "relocation truncated to fit"
#EXTRALDFLAGS = -Wl,--relax
diff --git a/converter/ps2_usb/config.h b/converter/ps2_usb/config.h
index c9bab1b..5b64400 100644
--- a/converter/ps2_usb/config.h
+++ b/converter/ps2_usb/config.h
@@ -69,7 +69,7 @@ along with this program. If not, see .
#define PS2_DATA_PORT PORTD
#define PS2_DATA_PIN PIND
#define PS2_DATA_DDR DDRD
-#define PS2_DATA_BIT 2
+#define PS2_DATA_BIT 0
#define PS2_INT_INIT() do { \
EICRA |= ((1<.
#endif
#endif
+#ifdef SERIAL_MOUSE_MICROSOFT
+ /*
+ * Serial(USART) configuration (for Microsoft serial mice)
+ * asynchronous, positive logic, 1200baud, bit order: LSB first
+ * 1-start bit, 7-data bit, no parity, 1-stop bit
+ */
+ #define SERIAL_UART_BAUD 1200
+ #define SERIAL_UART_DATA UDR1
+ #define SERIAL_UART_UBRR ((F_CPU/(16UL*SERIAL_UART_BAUD))-1)
+ #define SERIAL_UART_RXD_VECT USART1_RX_vect
+ #define SERIAL_UART_TXD_READY (UCSR1A&(1<>8); /* baud rate */ \
+ UCSR1B |= (1<>8); /* baud rate */ \
+ UCSR1B |= (1<
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see .
+*/
+
+#ifndef SERIAL_MOUSE_H
+#define SERIAL_MOUSE_H
+
+#include
+
+#include "serial.h"
+
+static inline uint8_t serial_mouse_init(void)
+{
+ serial_init();
+ return 0;
+}
+
+void serial_mouse_task(void);
+
+#endif
diff --git a/protocol/serial_mouse_microsoft.c b/protocol/serial_mouse_microsoft.c
new file mode 100644
index 0000000..ab74b7c
--- /dev/null
+++ b/protocol/serial_mouse_microsoft.c
@@ -0,0 +1,124 @@
+/*
+Copyright 2014 Robin Haberkorn
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see .
+*/
+
+#include
+#include
+#include
+
+#include "serial.h"
+#include "serial_mouse.h"
+#include "report.h"
+#include "host.h"
+#include "timer.h"
+#include "print.h"
+#include "debug.h"
+
+#ifdef MAX
+#undef MAX
+#endif
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+
+static void print_usb_data(const report_mouse_t *report);
+
+void serial_mouse_task(void)
+{
+ /* 3 byte ring buffer */
+ static uint8_t buffer[3];
+ static int buffer_cur = 0;
+
+ static report_mouse_t report = {};
+
+ int16_t rcv;
+
+ rcv = serial_recv2();
+ if (rcv < 0)
+ /* no new data */
+ return;
+
+ if (debug_mouse)
+ xprintf("serial_mouse: byte: %04X\n", rcv);
+
+ /*
+ * If bit 6 is one, this signals the beginning
+ * of a 3 byte sequence/packet.
+ */
+ if (rcv & (1 << 6))
+ buffer_cur = 0;
+
+ buffer[buffer_cur] = (uint8_t)rcv;
+
+ if (buffer_cur == 0 && buffer[buffer_cur] == 0x20) {
+ /*
+ * Logitech extension: This must be a follow-up on
+ * the last 3-byte packet signaling a middle button click
+ */
+ report.buttons |= MOUSE_BTN3;
+ report.x = report.y = 0;
+
+ print_usb_data(&report);
+ host_mouse_send(&report);
+ return;
+ }
+
+ buffer_cur++;
+
+ if (buffer_cur < 3)
+ return;
+ buffer_cur = 0;
+
+ /*
+ * parse 3 byte packet.
+ * NOTE: We only get a complete packet
+ * if the mouse moved or the button states
+ * change.
+ */
+ report.buttons = 0;
+ if (buffer[0] & (1 << 5))
+ report.buttons |= MOUSE_BTN1;
+ if (buffer[0] & (1 << 4))
+ report.buttons |= MOUSE_BTN2;
+
+ report.x = (buffer[0] << 6) | buffer[1];
+ report.y = ((buffer[0] << 4) & 0xC0) | buffer[2];
+
+ /* USB HID uses values from -127 to 127 only */
+ report.x = MAX(report.x, -127);
+ report.y = MAX(report.y, -127);
+
+#if 0
+ if (!report.buttons && !report.x && !report.y) {
+ /*
+ * Microsoft extension: Middle mouse button pressed
+ * FIXME: I don't know how exactly this extension works.
+ */
+ report.buttons |= MOUSE_BTN3;
+ }
+#endif
+
+ print_usb_data(&report);
+ host_mouse_send(&report);
+}
+
+static void print_usb_data(const report_mouse_t *report)
+{
+ if (!debug_mouse)
+ return;
+
+ xprintf("serial_mouse usb: [%02X|%d %d %d %d]\n",
+ report->buttons, report->x, report->y,
+ report->v, report->h);
+}
diff --git a/protocol/serial_mouse_mousesystems.c b/protocol/serial_mouse_mousesystems.c
new file mode 100644
index 0000000..cfe8996
--- /dev/null
+++ b/protocol/serial_mouse_mousesystems.c
@@ -0,0 +1,131 @@
+/*
+Copyright 2014 Robin Haberkorn
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see .
+*/
+
+#include
+#include
+#include
+
+#include "serial.h"
+#include "serial_mouse.h"
+#include "report.h"
+#include "host.h"
+#include "timer.h"
+#include "print.h"
+#include "debug.h"
+
+#ifdef MAX
+#undef MAX
+#endif
+#define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+
+//#define SERIAL_MOUSE_CENTER_SCROLL
+
+static void print_usb_data(const report_mouse_t *report);
+
+void serial_mouse_task(void)
+{
+ /* 5 byte ring buffer */
+ static uint8_t buffer[5];
+ static int buffer_cur = 0;
+
+ int16_t rcv;
+
+ report_mouse_t report = {0, 0, 0, 0, 0};
+
+ rcv = serial_recv2();
+ if (rcv < 0)
+ /* no new data */
+ return;
+
+ if (debug_mouse)
+ xprintf("serial_mouse: byte: %04X\n", rcv);
+
+ /*
+ * Synchronization: mouse(4) says that all
+ * bytes but the first one in the packet have
+ * bit 7 == 0, but this is untrue.
+ * Therefore we discard all bytes up to the
+ * first one with the characteristic bit pattern.
+ */
+ if (buffer_cur == 0 && (rcv >> 3) != 0x10)
+ return;
+
+ buffer[buffer_cur++] = (uint8_t)rcv;
+
+ if (buffer_cur < 5)
+ return;
+ buffer_cur = 0;
+
+#ifdef SERIAL_MOUSE_CENTER_SCROLL
+ if ((buffer[0] & 0x7) == 0x5 && (buffer[1] || buffer[2])) {
+ /* USB HID uses only values from -127 to 127 */
+ report.h = MAX((int8_t)buffer[1], -127);
+ report.v = MAX((int8_t)buffer[2], -127);
+
+ print_usb_data(&report);
+ host_mouse_send(&report);
+
+ if (buffer[3] || buffer[4]) {
+ report.h = MAX((int8_t)buffer[3], -127);
+ report.v = MAX((int8_t)buffer[4], -127);
+
+ print_usb_data(&report);
+ host_mouse_send(&report);
+ }
+
+ return;
+ }
+#endif
+
+ /*
+ * parse 5 byte packet.
+ * NOTE: We only get a complete packet
+ * if the mouse moved or the button states
+ * change.
+ */
+ if (!(buffer[0] & (1 << 2)))
+ report.buttons |= MOUSE_BTN1;
+ if (!(buffer[0] & (1 << 1)))
+ report.buttons |= MOUSE_BTN3;
+ if (!(buffer[0] & (1 << 0)))
+ report.buttons |= MOUSE_BTN2;
+
+ /* USB HID uses only values from -127 to 127 */
+ report.x = MAX((int8_t)buffer[1], -127);
+ report.y = MAX(-(int8_t)buffer[2], -127);
+
+ print_usb_data(&report);
+ host_mouse_send(&report);
+
+ if (buffer[3] || buffer[4]) {
+ report.x = MAX((int8_t)buffer[3], -127);
+ report.y = MAX(-(int8_t)buffer[4], -127);
+
+ print_usb_data(&report);
+ host_mouse_send(&report);
+ }
+}
+
+static void print_usb_data(const report_mouse_t *report)
+{
+ if (!debug_mouse)
+ return;
+
+ xprintf("serial_mouse usb: [%02X|%d %d %d %d]\n",
+ report->buttons, report->x, report->y,
+ report->v, report->h);
+}