Added SHARP X68000 keyboard support.

8 files changed, 709 insertions, 0 deletions

diff --git a/x68k_usb/Makefile b/x68k_usb/Makefile
new file mode 100644
index 0000000000..c4b9b221b0
--- /dev/null
+++ b/x68k_usb/Makefile
@@ -0,0 +1,85 @@
+#
+# Makefile for PJRC Teensy
+#
+
+
+# Target file name (without extension).
+TARGET = x68k_usb_pjrc
+
+# Directory common source filess exist
+COMMON_DIR = ..
+
+# Directory keyboard dependent files exist
+TARGET_DIR = .
+
+# keyboard dependent files
+SRC =	main.c \
+	keymap.c \
+	matrix.c \
+	led.c \
+	x68k.c
+
+CONFIG_H = config_pjrc.h
+
+
+# MCU name, you MUST set this to match the board you are using
+# type "make clean" after changing this, so all files will be rebuilt
+#MCU = at90usb162       # Teensy 1.0
+MCU = atmega32u4       # Teensy 2.0
+#MCU = at90usb646       # Teensy++ 1.0
+#MCU = at90usb1286      # Teensy++ 2.0
+
+
+# Processor frequency.
+#   Normally the first thing your program should do is set the clock prescaler,
+#   so your program will run at the correct speed.  You should also set this
+#   variable to same clock speed.  The _delay_ms() macro uses this, and many
+#   examples use this variable to calculate timings.  Do not add a "UL" here.
+F_CPU = 16000000
+
+
+# Build Options
+#   *Comment out* to disable the options.
+#
+MOUSEKEY_ENABLE = yes	# Mouse keys
+EXTRAKEY_ENABLE = yes	# Audio control and System control
+NKRO_ENABLE = yes	# USB Nkey Rollover
+
+
+
+#---------------- Programming Options --------------------------
+AVRDUDE = avrdude
+# Type: avrdude -c ? to get a full listing.
+AVRDUDE_PROGRAMMER = avr109
+AVRDUDE_PORT = /dev/ttyACM0
+AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
+#AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep
+
+# Uncomment the following if you want avrdude's erase cycle counter.
+# Note that this counter needs to be initialized first using -Yn,
+# see avrdude manual.
+#AVRDUDE_ERASE_COUNTER = -y
+
+# Uncomment the following if you do /not/ wish a verification to be
+# performed after programming the device.
+#AVRDUDE_NO_VERIFY = -V
+
+# Increase verbosity level.  Please use this when submitting bug
+# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude> 
+# to submit bug reports.
+#AVRDUDE_VERBOSE = -v -v
+
+AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
+#AVRDUDE_FLAGS = -p $(MCU) -c $(AVRDUDE_PROGRAMMER)
+AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)
+AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)
+AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)
+
+#PROGRAM_CMD = $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+#PROGRAM_CMD = teensy_loader_cli -mmcu=$(MCU) -w -v $(TARGET).hex
+PROGRAM_CMD = dfu-programmer atmega32u4 flash $(TARGET).hex
+
+
+
+include $(COMMON_DIR)/pjrc.mk
+include $(COMMON_DIR)/common.mk
diff --git a/x68k_usb/README b/x68k_usb/README
new file mode 100644
index 0000000000..0b61b2c4b3
--- /dev/null
+++ b/x68k_usb/README
@@ -0,0 +1,129 @@
+X68000 to USB keyboard protocol converter
+=========================================
+SHARP X68000 is a hobby computer released in Japan.(1987-93)
+http://en.wikipedia.org/wiki/Sharp_X68000
+
+X68000 keyboard has ALPS linear switches.
+- DSETK0016CE01   green linear
+- DSETK0023CE03   yellow linear
+
+
+Hardware
+--------
+Target MCU is ATMega32u4 but other USB capable AVR will also work.
+You can use PJRC Teensy as dev board.
+    http://www.pjrc.com/teensy/
+
+Wiring:
+    Mini-DIN            Teensy
+    -----------------------------------------------------
+    pin1   +5V          VCC
+    pin2   MOUSE        -
+    pin3   RXD          PD2(RXD)
+    pin4   TXD          PD3(TXD) NOTE: Not supported yet.
+    pin5   READY        -
+    pin6   REMOTE       -
+    pin7   GND          GND
+
+
+Firmware
+--------
+Build:
+    $ cd x68k_usb
+    $ make
+
+And load the binary to MCU with your favorite programmer.
+If you use Teensy you can load with PJRC Teensy Loader tool.
+    http://www.pjrc.com/teensy/loader.html
+
+
+*   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *   *
+
+
+X68000 Keyboard Protocol
+========================
+http://kyoutan.jpn.org/uts/pc/pic/x68key/
+
+
+Connector
+---------
+Mini DIN 7pin(female connector on computer side)
+       7 6 5
+       o o o
+    4 o  =  o 3
+        o o
+        2 1
+
+    Mini-DIN
+    -------------
+    pin1   +5V
+    pin2   MOUSE
+    pin3   RXD
+    pin4   TXD
+    pin5   READY
+    pin6   REMOTE
+    pin7   GND
+
+
+Signaling
+---------
+- TXD,RXD
+    Asynchronous, 2400baud, 1-startbit(L), 8-databit, 1-stopbit(H)
+
+- READY
+    ready/not ready(1/0)
+
+
+Data from keyboard
+------------------
+bit 7       make/break flag(0/1)
+bit 6-0     following scan code
+
+
+Data from computer
+------------------
+- LED contorol ON/OFF(0/1)
+    bit 7   1(fixed)
+    bit 6   全角
+    bit 5   ひらがな
+    bit 4   INS
+    bit 3   CAPS
+    bit 2   コード入力
+    bit 1   ローマ字
+    bit 0   かな
+
+- Repeat delay
+    bit 7   0(fixed)
+    bit 6   1(fixed)
+    bit 5   1(fixed)
+    bit 4   0(fixed)
+    bit 3-0 delay
+    REPEAT_DELAY = 200+delay*100 ms
+    default: 500ms
+ 
+-  Repeat time
+    bit 7   0(fixed)
+    bit 6   1(fixed)
+    bit 5   1(fixed)
+    bit 4   1(fixed)
+    bit 3-0 time
+    REPEAT_TIME = 30+time^2*5 ms
+    default: 110ms
+
+
+Scan Codes
+----------
+,---. ,---.    ,-------------------,    ,-------------------.  ,-----------. ,---------------.
+| 61| | 62|    | 63| 64| 65| 66| 67|    | 68| 69| 6A| 6B| 6C|  | 5A| 5B| 5C| | 5D| 52| 53| 54|
+`---' `---'    `-------------------'    `-------------------'  `-----------' `---------------'
+,-----------------------------------------------------------.  ,-----------. ,---------------.
+| 01| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 0E| 0F|  | 36| 5E| 37| | 3F| 40| 41| 42|
+|-----------------------------------------------------------|  |------------ |---------------|
+|  10 | 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B| 1C|     |  | 38| 39| 3A| | 43| 44| 45| 46|
+|------------------------------------------------------. 1D |  `---=====---' |---------------|
+|  71  | 1E| 1F| 20| 21| 2l| 23| 24| 25| 26| 27| 28| 29|    |   ___| 3C|___  | 47| 48| 49| 4A|
+|-----------------------------------------------------------|  | 3B|---| 3D| |-----------|---|
+|  70    | 2A| 2B| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 34|   70 |  `---| 3E|---' | 4B| 4C| 4D|   |
+`-----------------------------------------------------------|  .---=====---. |-----------| 4E|
+       | 5F| 55 | 56 |     35     | 57 | 58 | 59 | 60|         |  72 |  73 | | 4F| 50| 51|   |
+       `---------------------------------------------'         `-----------' `---------------'
diff --git a/x68k_usb/config_pjrc.h b/x68k_usb/config_pjrc.h
new file mode 100644
index 0000000000..20758bf249
--- /dev/null
+++ b/x68k_usb/config_pjrc.h
@@ -0,0 +1,66 @@
+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+
+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 <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef CONFIG_H
+#define CONFIG_H
+
+/* controller configuration */
+#include "controller_teensy.h"
+
+#define VENDOR_ID       0xFEED
+#define PRODUCT_ID      0x6800
+#define MANUFACTURER    t.m.k.
+#define PRODUCT         SHARP X68000 keyboard converter
+#define DESCRIPTION     converts SHARP X68000 keyboard protocol into USB
+
+
+/* matrix size */
+#define MATRIX_ROWS 16
+#define MATRIX_COLS 8
+
+
+/* key combination for command */
+#define IS_COMMAND() ( \
+    keyboard_report->mods == (MOD_BIT(KB_LALT) | MOD_BIT(KB_RALT)) || \
+    keyboard_report->mods == (MOD_BIT(KB_LCTRL) | MOD_BIT(KB_RSHIFT)) \
+)
+
+
+/* mouse keys */
+#ifdef MOUSEKEY_ENABLE
+#   define MOUSEKEY_DELAY_TIME 255
+#endif
+
+
+/* USART configuration
+ *     asynchronous, 2400baud, 8-data bit, non parity, 1-stop bit, no flow control
+ */
+#ifdef __AVR_ATmega32U4__
+#   define KBD_RX_VECT        USART1_RX_vect
+#   define KBD_RX_DATA        UDR1
+#   define KBD_RX_BAUD        2400
+#   define KBD_RX_UBBR        ((F_CPU/(16UL*KBD_RX_BAUD))-1)
+#   define KBD_RX_INIT()      do { \
+        UBRR1L = (uint8_t) KBD_RX_UBBR; \
+        UBRR1H = (uint8_t) (KBD_RX_UBBR>>8); \
+        UCSR1B |= (1<<RXCIE1) | (1<<RXEN1); \
+    } while(0)
+#else
+#   error "USART configuration is needed."
+#endif
+
+#endif
diff --git a/x68k_usb/keymap.c b/x68k_usb/keymap.c
new file mode 100644
index 0000000000..94c2aeee11
--- /dev/null
+++ b/x68k_usb/keymap.c
@@ -0,0 +1,140 @@
+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+
+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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/pgmspace.h>
+#include "usb_keycodes.h"
+#include "util.h"
+#include "keymap.h"
+
+
+
+
+// Following macros help you to define a keymap with the form of actual keyboard layout.
+
+/* X68000 Keyboard Scan codes
+    ,---. ,---.    ,-------------------,    ,-------------------.  ,-----------. ,---------------.
+    | 61| | 62|    | 63| 64| 65| 66| 67|    | 68| 69| 6A| 6B| 6C|  | 5A| 5B| 5C| | 5D| 52| 53| 54|
+    `---' `---'    `-------------------'    `-------------------'  `-----------' `---------------'
+    ,-----------------------------------------------------------.  ,-----------. ,---------------.
+    | 01| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 0E| 0F|  | 36| 5E| 37| | 3F| 40| 41| 42|
+    |-----------------------------------------------------------|  |------------ |---------------|
+    |  10 | 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B| 1C|     |  | 38| 39| 3A| | 43| 44| 45| 46|
+    |------------------------------------------------------. 1D |  `---=====---' |---------------|
+    |  71  | 1E| 1F| 20| 21| 2l| 23| 24| 25| 26| 27| 28| 29|    |   ___| 3C|___  | 47| 48| 49| 4A|
+    |-----------------------------------------------------------|  | 3B|---| 3D| |-----------|---|
+    |  70    | 2A| 2B| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 34|   70 |  `---| 3E|---' | 4B| 4C| 4D|   |
+    `-----------------------------------------------------------|  .---=====---. |-----------| 4E|
+           | 5F| 55 | 56 |     35     | 57 | 58 | 59 | 60|         |  72 |  73 | | 4F| 50| 51|   |
+           `---------------------------------------------'         `-----------' `---------------'
+*/
+#define KEYMAP( \
+    K61,K62,        K63,K64,K65,K66,K67,    K68,K69,K6A,K6B,K6C,  K5A,K5B,K5C,  K5D,K52,K53,K54, \
+    K01,K02,K03,K04,K05,K06,K07,K08,K09,K0A,K0B,K0C,K0D,K0E,K0F,  K36,K5E,K37,  K3F,K40,K41,K42, \
+    K10,K11,K12,K13,K14,K15,K16,K17,K18,K19,K1A,K1B,K1C,    K1D,  K38,K39,K3A,  K43,K44,K45,K46, \
+    K71,K1E,K1F,K20,K21,K22,K23,K24,K25,K26,K27,K28,K29,              K3C,      K47,K48,K49,K4A, \
+    K70,K2A,K2B,K2C,K2D,K2E,K2F,K30,K31,K32,K33,K34,              K3B,K3E,K3D,  K4B,K4C,K4D,K4E, \
+        K5F,K55,K56,    K35,        K57,K58,K59,K60,              K72,    K73,  K4F,K50,K51      \
+) { \
+    { KB_NO,    KB_##K01, KB_##K02, KB_##K03, KB_##K04, KB_##K05, KB_##K06, KB_##K07 }, \
+    { KB_##K08, KB_##K09, KB_##K0A, KB_##K0B, KB_##K0C, KB_##K0D, KB_##K0E, KB_##K0F }, \
+    { KB_##K10, KB_##K11, KB_##K12, KB_##K13, KB_##K14, KB_##K15, KB_##K16, KB_##K17 }, \
+    { KB_##K18, KB_##K19, KB_##K1A, KB_##K1B, KB_##K1C, KB_##K1D, KB_##K1E, KB_##K1F }, \
+    { KB_##K20, KB_##K21, KB_##K22, KB_##K23, KB_##K24, KB_##K25, KB_##K26, KB_##K27 }, \
+    { KB_##K28, KB_##K29, KB_##K2A, KB_##K2B, KB_##K2C, KB_##K2D, KB_##K2E, KB_##K2F }, \
+    { KB_##K30, KB_##K31, KB_##K32, KB_##K33, KB_##K34, KB_##K35, KB_##K36, KB_##K37 }, \
+    { KB_##K38, KB_##K39, KB_##K3A, KB_##K3B, KB_##K3C, KB_##K3D, KB_##K3E, KB_##K3F }, \
+    { KB_##K40, KB_##K41, KB_##K42, KB_##K43, KB_##K44, KB_##K45, KB_##K46, KB_##K47 }, \
+    { KB_##K48, KB_##K49, KB_##K4A, KB_##K4B, KB_##K4C, KB_##K4D, KB_##K4E, KB_##K4F }, \
+    { KB_##K50, KB_##K51, KB_##K52, KB_##K53, KB_##K54, KB_##K55, KB_##K56, KB_##K57 }, \
+    { KB_##K58, KB_##K59, KB_##K5A, KB_##K5B, KB_##K5C, KB_##K5D, KB_##K5E, KB_##K5F }, \
+    { KB_##K60, KB_##K61, KB_##K62, KB_##K63, KB_##K64, KB_##K65, KB_##K66, KB_##K67 }, \
+    { KB_##K68, KB_##K69, KB_##K6A, KB_##K6B, KB_##K6C, KB_NO,    KB_NO,    KB_NO    }, \
+    { KB_##K70, KB_##K71, KB_##K72, KB_##K73, KB_NO,    KB_NO,    KB_NO,    KB_NO,   }, \
+    { KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_NO,    KB_NO    }  \
+}
+
+
+// Assign Fn key(0-7) to a layer to which switch with the Fn key pressed.
+static const uint8_t PROGMEM fn_layer[] = {
+    0,              // Fn0
+    0,              // Fn1
+    0,              // Fn2
+    0,              // Fn3
+    0,              // Fn4
+    0,              // Fn5
+    0,              // Fn6
+    0               // Fn7
+};
+
+// Assign Fn key(0-7) to a keycode sent when release Fn key without use of the layer.
+// See layer.c for details.
+static const uint8_t PROGMEM fn_keycode[] = {
+    KB_NO,          // Fn0
+    KB_NO,          // Fn1
+    KB_NO,          // Fn2
+    KB_NO,          // Fn3
+    KB_NO,          // Fn4
+    KB_NO,          // Fn5
+    KB_NO,          // Fn6
+    KB_NO           // Fn7
+};
+
+
+static const uint8_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = {
+/* X68000 Keyboard Scan codes
+    ,---. ,---.    ,-------------------,    ,-------------------.  ,-----------. ,---------------.
+    | 61| | 62|    | 63| 64| 65| 66| 67|    | 68| 69| 6A| 6B| 6C|  | 5A| 5B| 5C| | 5D| 52| 53| 54|
+    `---' `---'    `-------------------'    `-------------------'  `-----------' `---------------'
+    ,-----------------------------------------------------------.  ,-----------. ,---------------.
+    | 01| 02| 03| 04| 05| 06| 07| 08| 09| 0A| 0B| 0C| 0D| 0E| 0F|  | 36| 5E| 37| | 3F| 40| 41| 42|
+    |-----------------------------------------------------------|  |------------ |---------------|
+    |  10 | 11| 12| 13| 14| 15| 16| 17| 18| 19| 1A| 1B| 1C|     |  | 38| 39| 3A| | 43| 44| 45| 46|
+    |------------------------------------------------------. 1D |  `---=====---' |---------------|
+    |  71  | 1E| 1F| 20| 21| 2l| 23| 24| 25| 26| 27| 28| 29|    |   ___| 3C|___  | 47| 48| 49| 4A|
+    |-----------------------------------------------------------|  | 3B|---| 3D| |-----------|---|
+    |  70    | 2A| 2B| 2C| 2D| 2E| 2F| 30| 31| 32| 33| 34|   70 |  `---| 3E|---' | 4B| 4C| 4D|   |
+    `-----------------------------------------------------------|  .---=====---. |-----------| 4E|
+           | 5F| 55 | 56 |     35     | 57 | 58 | 59 | 60|         |  72 |  73 | | 4F| 50| 51|   |
+           `---------------------------------------------'         `-----------' `---------------'
+*/
+    KEYMAP(
+    NO,  NO,  F1,  F2,  F3,  F4,  F5,       F6,  F7,  F8,  F9,  F10,              PSCR,SLCK,PAUS,     CAPS,NO,  NO,  NO,
+    ESC, 1,   2,   3,   4,   5,   6,   7,   8,   9,   0,   MINS,EQL, BSLS,BSPC,   INS, HOME,PGUP,     NLCK,PSLS,PAST,PMNS,
+    TAB, Q,   W,   E,   R,   T,   Y,   U,   I,   O,   P,   LBRC,RBRC,     ENT,    DEL, END, PGDN,     P7,  P8,  P9,  PPLS,
+    LCTL,A,   S,   D,   F,   G,   H,   J,   K,   L,   SCLN,QUOT,ENT,                   UP,            P4,  P5,  P6,  PEQL,
+    LSFT,Z,   X,   C,   V,   B,   N,   M,   COMM,DOT, SLSH,GRV,                   LEFT,DOWN,RGHT,     P1,  P2,  P3,  PENT,
+         LGUI,LALT,NO,       SPC,      RALT,RGUI,RCTL,APP,                        NO,       NO,       P0,  PCMM,PDOT
+    ),
+};
+
+
+uint8_t keymap_get_keycode(uint8_t layer, uint8_t row, uint8_t col)
+{
+    return pgm_read_byte(&keymaps[(layer)][(row)][(col)]);
+}
+
+uint8_t keymap_fn_layer(uint8_t fn_bits)
+{
+    return pgm_read_byte(&fn_layer[biton(fn_bits)]);
+}
+
+uint8_t keymap_fn_keycode(uint8_t fn_bits)
+{
+    return pgm_read_byte(&fn_keycode[(biton(fn_bits))]);
+}
diff --git a/x68k_usb/led.c b/x68k_usb/led.c
new file mode 100644
index 0000000000..40156cf4ac
--- /dev/null
+++ b/x68k_usb/led.c
@@ -0,0 +1,26 @@
+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+
+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 <http://www.gnu.org/licenses/>.
+*/
+
+#include "stdint.h"
+#include "x68k.h"
+#include "led.h"
+
+
+void led_set(uint8_t usb_led)
+{
+    // not supported now
+}
diff --git a/x68k_usb/matrix.c b/x68k_usb/matrix.c
new file mode 100644
index 0000000000..954e7ef129
--- /dev/null
+++ b/x68k_usb/matrix.c
@@ -0,0 +1,141 @@
+/*
+Copyright 2012 Jun Wako <wakojun@gmail.com>
+
+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 <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "print.h"
+#include "util.h"
+#include "x68k.h"
+#include "matrix.h"
+
+
+/*
+ * Matrix Array usage:
+ *
+ * ROW: 16(4bits)
+ * COL:  8(3bits)
+ *
+ *    8bit wide
+ *   +---------+
+ *  0|00 ... 07|
+ *  1|08 ... 0F|
+ *  :|   ...   |
+ *  :|   ...   |
+ *  E|70 ... 77|
+ *  F|78 ... 7F|
+ *   +---------+
+ *
+ */
+static uint8_t matrix[MATRIX_ROWS];
+#define ROW(code)      ((code>>3)&0xF)
+#define COL(code)      (code&0x07)
+
+static bool is_modified = false;
+
+
+inline
+uint8_t matrix_rows(void)
+{
+    return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+    return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+    x68k_init();
+
+    // initialize matrix state: all keys off
+    for (uint8_t i=0; i < MATRIX_ROWS; i++) matrix[i] = 0x00;
+
+    return;
+}
+
+uint8_t matrix_scan(void)
+{
+    is_modified = false;
+
+    uint8_t code;
+    code = x68k_recv();
+    if (code == 0) {
+        return 0;
+    }
+
+    phex(code); print(" ");
+    if (code&0x80) {
+        // break code
+        if (matrix_is_on(ROW(code), COL(code))) {
+            matrix[ROW(code)] &= ~(1<<COL(code));
+            is_modified = true;
+        }
+    } else {
+        // make code
+        if (!matrix_is_on(ROW(code), COL(code))) {
+            matrix[ROW(code)] |=  (1<<COL(code));
+            is_modified = true;
+        }
+    }
+    return code;
+}
+
+bool matrix_is_modified(void)
+{
+    return is_modified;
+}
+
+inline
+bool matrix_has_ghost(void)
+{
+    return false;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+    return (matrix[row] & (1<<col));
+}
+
+inline
+uint8_t matrix_get_row(uint8_t row)
+{
+    return matrix[row];
+}
+
+void matrix_print(void)
+{
+    print("\nr/c 01234567\n");
+    for (uint8_t row = 0; row < matrix_rows(); row++) {
+        phex(row); print(": ");
+        pbin_reverse(matrix_get_row(row));
+        print("\n");
+    }
+}
+
+uint8_t matrix_key_count(void)
+{
+    uint8_t count = 0;
+    for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+        count += bitpop(matrix[i]);
+    }
+    return count;
+}
diff --git a/x68k_usb/x68k.c b/x68k_usb/x68k.c
new file mode 100644
index 0000000000..d17af51cc2
--- /dev/null
+++ b/x68k_usb/x68k.c
@@ -0,0 +1,75 @@
+/*
+Copyright 2012 Jun WAKO <wakojun@gmail.com>
+
+This software is licensed with a Modified BSD License.
+All of this is supposed to be Free Software, Open Source, DFSG-free,
+GPL-compatible, and OK to use in both free and proprietary applications.
+Additions and corrections to this file are welcome.
+
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in
+  the documentation and/or other materials provided with the
+  distribution.
+
+* Neither the name of the copyright holders nor the names of
+  contributors may be used to endorse or promote products derived
+  from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include <stdbool.h>
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include "x68k.h"
+
+
+void x68k_init(void)
+{
+    KBD_RX_INIT();
+}
+
+// RX ring buffer
+#define RBUF_SIZE   8
+static uint8_t rbuf[RBUF_SIZE];
+static uint8_t rbuf_head = 0;
+static uint8_t rbuf_tail = 0;
+
+uint8_t x68k_recv(void)
+{
+    uint8_t data = 0;
+    if (rbuf_head == rbuf_tail) {
+        return 0;
+    }
+
+    data = rbuf[rbuf_tail];
+    rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
+    return data;
+}
+
+// USART RX complete interrupt
+ISR(KBD_RX_VECT)
+{
+    uint8_t next = (rbuf_head + 1) % RBUF_SIZE;
+    if (next != rbuf_tail) {
+        rbuf[rbuf_head] = KBD_RX_DATA;
+        rbuf_head = next;
+    }
+}
diff --git a/x68k_usb/x68k.h b/x68k_usb/x68k.h
new file mode 100644
index 0000000000..2cfda63a7a
--- /dev/null
+++ b/x68k_usb/x68k.h
@@ -0,0 +1,47 @@
+/*
+Copyright 2012 Jun WAKO <wakojun@gmail.com>
+
+This software is licensed with a Modified BSD License.
+All of this is supposed to be Free Software, Open Source, DFSG-free,
+GPL-compatible, and OK to use in both free and proprietary applications.
+Additions and corrections to this file are welcome.
+
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright
+  notice, this list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright
+  notice, this list of conditions and the following disclaimer in
+  the documentation and/or other materials provided with the
+  distribution.
+
+* Neither the name of the copyright holders nor the names of
+  contributors may be used to endorse or promote products derived
+  from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef X68K_H
+#define X68K_H
+
+/* host role */
+void x68k_init(void);
+uint8_t x68k_recv(void);
+
+/* device role */
+
+#endif