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diff --git a/keyboard/gh60/matrix.c b/keyboard/gh60/matrix.c
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+/*
+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/>.
+*/
+
+/*
+ * scan matrix
+ */
+#include <stdint.h>
+#include <stdbool.h>
+#include <avr/io.h>
+#include <util/delay.h>
+#include "print.h"
+#include "debug.h"
+#include "util.h"
+#include "matrix.h"
+
+
+#ifndef DEBOUNCE
+# define DEBOUNCE 5
+#endif
+static uint8_t debouncing = DEBOUNCE;
+
+/* matrix state(1:on, 0:off) */
+static matrix_row_t matrix[MATRIX_ROWS];
+static matrix_row_t matrix_debouncing[MATRIX_ROWS];
+
+static matrix_row_t read_cols(void);
+static void init_cols(void);
+static void unselect_rows(void);
+static void select_row(uint8_t row);
+
+
+inline
+uint8_t matrix_rows(void)
+{
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+ return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+ // initialize row and col
+ unselect_rows();
+ init_cols();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) {
+ matrix[i] = 0;
+ matrix_debouncing[i] = 0;
+ }
+}
+
+uint8_t matrix_scan(void)
+{
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ select_row(i);
+ _delay_us(30); // without this wait read unstable value.
+ matrix_row_t cols = read_cols();
+ if (matrix_debouncing[i] != cols) {
+ matrix_debouncing[i] = cols;
+ if (debouncing) {
+ debug("bounce!: "); debug_hex(debouncing); debug("\n");
+ }
+ debouncing = DEBOUNCE;
+ }
+ unselect_rows();
+ }
+
+ if (debouncing) {
+ if (--debouncing) {
+ _delay_ms(1);
+ } else {
+ for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
+ matrix[i] = matrix_debouncing[i];
+ }
+ }
+ }
+
+ return 1;
+}
+
+bool matrix_is_modified(void)
+{
+ if (debouncing) return false;
+ return true;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+ return (matrix[row] & ((matrix_row_t)1<<col));
+}
+
+inline
+matrix_row_t matrix_get_row(uint8_t row)
+{
+ return matrix[row];
+}
+
+void matrix_print(void)
+{
+ print("\nr/c 0123456789ABCDEF\n");
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
+ phex(row); print(": ");
+ pbin_reverse16(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 += bitpop16(matrix[i]);
+ }
+ return count;
+}
+
+/* Column pin configuration
+ * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
+ * pin: F0 F1 E6 C7 C6 B6 D4 B1 B0 B5 B4 D7 D6 B3 (Rev.A)
+ * pin: B7 (Rev.B)
+ */
+static void init_cols(void)
+{
+ // Input with pull-up(DDR:0, PORT:1)
+ DDRF &= ~(1<<0 | 1<<1);
+ PORTF |= (1<<0 | 1<<1);
+ DDRE &= ~(1<<6);
+ PORTE |= (1<<6);
+ DDRD &= ~(1<<7 | 1<<6 | 1<<4);
+ PORTD |= (1<<7 | 1<<6 | 1<<4);
+ DDRC &= ~(1<<7 | 1<<6);
+ PORTC |= (1<<7 | 1<<6);
+ DDRB &= ~(1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
+ PORTB |= (1<<7 | 1<<6 | 1<< 5 | 1<<4 | 1<<3 | 1<<1 | 1<<0);
+}
+
+static matrix_row_t read_cols(void)
+{
+ return (PINF&(1<<0) ? 0 : (1<<0)) |
+ (PINF&(1<<1) ? 0 : (1<<1)) |
+ (PINE&(1<<6) ? 0 : (1<<2)) |
+ (PINC&(1<<7) ? 0 : (1<<3)) |
+ (PINC&(1<<6) ? 0 : (1<<4)) |
+ (PINB&(1<<6) ? 0 : (1<<5)) |
+ (PIND&(1<<4) ? 0 : (1<<6)) |
+ (PINB&(1<<1) ? 0 : (1<<7)) |
+ ((PINB&(1<<0) && PINB&(1<<7)) ? 0 : (1<<8)) | // Rev.A and B
+ (PINB&(1<<5) ? 0 : (1<<9)) |
+ (PINB&(1<<4) ? 0 : (1<<10)) |
+ (PIND&(1<<7) ? 0 : (1<<11)) |
+ (PIND&(1<<6) ? 0 : (1<<12)) |
+ (PINB&(1<<3) ? 0 : (1<<13));
+}
+
+/* Row pin configuration
+ * row: 0 1 2 3 4
+ * pin: D0 D1 D2 D3 D5
+ */
+static void unselect_rows(void)
+{
+ // Hi-Z(DDR:0, PORT:0) to unselect
+ DDRD &= ~0b00101111;
+ PORTD &= ~0b00101111;
+}
+
+static void select_row(uint8_t row)
+{
+ // Output low(DDR:1, PORT:0) to select
+ switch (row) {
+ case 0:
+ DDRD |= (1<<0);
+ PORTD &= ~(1<<0);
+ break;
+ case 1:
+ DDRD |= (1<<1);
+ PORTD &= ~(1<<1);
+ break;
+ case 2:
+ DDRD |= (1<<2);
+ PORTD &= ~(1<<2);
+ break;
+ case 3:
+ DDRD |= (1<<3);
+ PORTD &= ~(1<<3);
+ break;
+ case 4:
+ DDRD |= (1<<5);
+ PORTD &= ~(1<<5);
+ break;
+ }
+}