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diff --git a/keyboard/phantom/matrix.c b/keyboard/phantom/matrix.c
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+/* Copyright 2012 Jun Wako <wakojun@gmail.com>
+ *
+ * This is heavily based on phantom/board.{c|h}.
+ * https://github.com/BathroomEpiphanies/AVR-Keyboard
+ *
+ * Copyright (c) 2012 Fredrik Atmer, Bathroom Epiphanies Inc
+ * http://bathroomepiphanies.com
+ *
+ * As for liscensing consult with the original files or its author.
+ */
+#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 0
+#endif
+static uint8_t debouncing = DEBOUNCE;
+
+// bit array of key state(1:on, 0:off)
+static matrix_row_t *matrix;
+static matrix_row_t *matrix_debounced;
+static matrix_row_t _matrix0[MATRIX_ROWS];
+static matrix_row_t _matrix1[MATRIX_ROWS];
+
+
+#define _DDRA (uint8_t *const)&DDRA
+#define _DDRB (uint8_t *const)&DDRB
+#define _DDRC (uint8_t *const)&DDRC
+#define _DDRD (uint8_t *const)&DDRD
+#define _DDRE (uint8_t *const)&DDRE
+#define _DDRF (uint8_t *const)&DDRF
+
+#define _PINA (uint8_t *const)&PINA
+#define _PINB (uint8_t *const)&PINB
+#define _PINC (uint8_t *const)&PINC
+#define _PIND (uint8_t *const)&PIND
+#define _PINE (uint8_t *const)&PINE
+#define _PINF (uint8_t *const)&PINF
+
+#define _PORTA (uint8_t *const)&PORTA
+#define _PORTB (uint8_t *const)&PORTB
+#define _PORTC (uint8_t *const)&PORTC
+#define _PORTD (uint8_t *const)&PORTD
+#define _PORTE (uint8_t *const)&PORTE
+#define _PORTF (uint8_t *const)&PORTF
+
+#define _BIT0 0x01
+#define _BIT1 0x02
+#define _BIT2 0x04
+#define _BIT3 0x08
+#define _BIT4 0x10
+#define _BIT5 0x20
+#define _BIT6 0x40
+#define _BIT7 0x80
+
+/* Specifies the ports and pin numbers for the rows */
+static
+uint8_t *const row_ddr[MATRIX_ROWS] = {_DDRB, _DDRB, _DDRB, _DDRB, _DDRB, _DDRB};
+
+static
+uint8_t *const row_port[MATRIX_ROWS] = {_PORTB, _PORTB, _PORTB, _PORTB, _PORTB, _PORTB};
+
+static
+uint8_t *const row_pin[MATRIX_ROWS] = {_PINB, _PINB, _PINB, _PINB, _PINB, _PINB};
+
+static
+const uint8_t row_bit[MATRIX_ROWS] = { _BIT0, _BIT1, _BIT2, _BIT3, _BIT4, _BIT5};
+
+/* Specifies the ports and pin numbers for the columns */
+static
+uint8_t *const col_ddr[MATRIX_COLS] = { _DDRD, _DDRC, _DDRC, _DDRD, _DDRD, _DDRE,
+ _DDRF, _DDRF, _DDRF, _DDRF, _DDRF, _DDRF,
+ _DDRD, _DDRD, _DDRD, _DDRD, _DDRD};
+
+static
+uint8_t *const col_port[MATRIX_COLS] = {_PORTD, _PORTC, _PORTC, _PORTD, _PORTD, _PORTE,
+ _PORTF, _PORTF, _PORTF, _PORTF, _PORTF, _PORTF,
+ _PORTD, _PORTD, _PORTD, _PORTD, _PORTD};
+
+static
+const uint8_t col_bit[MATRIX_COLS] = { _BIT5, _BIT7, _BIT6, _BIT4, _BIT0, _BIT6,
+ _BIT0, _BIT1, _BIT4, _BIT5, _BIT6, _BIT7,
+ _BIT7, _BIT6, _BIT1, _BIT2, _BIT3};
+
+static
+inline void pull_column(int col) {
+ *col_port[col] &= ~col_bit[col];
+}
+
+static
+inline void release_column(int col) {
+ *col_port[col] |= col_bit[col];
+}
+
+/* PORTB is set as input with pull-up resistors
+ PORTC,D,E,F are set to high output */
+
+static
+void setup_io_pins(void) {
+ uint8_t row, col;
+ for(row = 0; row < MATRIX_ROWS; row++) {
+ *row_ddr[row] &= ~row_bit[row];
+ *row_port[row] |= row_bit[row];
+ }
+ for(col = 0; col < MATRIX_COLS; col++) {
+ *col_ddr[col] |= col_bit[col];
+ *col_port[col] |= col_bit[col];
+ }
+}
+
+/* LEDs are on output compare pins OC1B OC1C
+ This activates fast PWM mode on them.
+ Prescaler 256 and 8-bit counter results in
+ 16000000/256/256 = 244 Hz blink frequency.
+ LED_A: Caps Lock
+ LED_B: Scroll Lock */
+/* Output on PWM pins are turned off when the timer
+ reaches the value in the output compare register,
+ and are turned on when it reaches TOP (=256). */
+static
+void setup_leds(void) {
+ TCCR1A |= // Timer control register 1A
+ (1<<WGM10) | // Fast PWM 8-bit
+ (1<<COM1B1)| // Clear OC1B on match, set at TOP
+ (1<<COM1C1); // Clear OC1C on match, set at TOP
+ TCCR1B |= // Timer control register 1B
+ (1<<WGM12) | // Fast PWM 8-bit
+ (1<<CS12); // Prescaler 256
+ OCR1B = 250; // Output compare register 1B
+ OCR1C = 250; // Output compare register 1C
+ // LEDs: LED_A -> PORTB6, LED_B -> PORTB7
+ DDRB &= 0x3F;
+ PORTB &= 0x3F;
+}
+
+
+inline
+uint8_t matrix_rows(void)
+{
+ return MATRIX_ROWS;
+}
+
+inline
+uint8_t matrix_cols(void)
+{
+ return MATRIX_COLS;
+}
+
+void matrix_init(void)
+{
+ // To use PORTF disable JTAG with writing JTD bit twice within four cycles.
+ MCUCR |= (1<<JTD);
+ MCUCR |= (1<<JTD);
+
+ // initialize row and col
+ setup_io_pins();
+ setup_leds();
+
+ // initialize matrix state: all keys off
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix0[i] = 0x00;
+ for (uint8_t i=0; i < MATRIX_ROWS; i++) _matrix1[i] = 0x00;
+ matrix = _matrix0;
+ matrix_debounced = _matrix1;
+}
+
+uint8_t matrix_scan(void)
+{
+ if (!debouncing) {
+ matrix_row_t *tmp = matrix_debounced;
+ matrix_debounced = matrix;
+ matrix = tmp;
+ }
+
+ for (uint8_t col = 0; col < MATRIX_COLS; col++) { // 0-16
+ pull_column(col); // output hi on theline
+ _delay_us(3); // without this wait it won't read stable value.
+ for (uint8_t row = 0; row < MATRIX_ROWS; row++) { // 0-5
+ bool prev_bit = matrix[row] & ((matrix_row_t)1<<col);
+ bool curr_bit = !(*row_pin[row] & row_bit[row]);
+ if (prev_bit != curr_bit) {
+ matrix[row] ^= ((matrix_row_t)1<<col);
+ if (debouncing) {
+ debug("bounce!: "); debug_hex(debouncing); print("\n");
+ }
+ debouncing = DEBOUNCE;
+ }
+ }
+ release_column(col);
+ }
+
+ if (debouncing) {
+ debouncing--;
+ }
+
+ return 1;
+}
+
+bool matrix_is_modified(void)
+{
+ // NOTE: no longer used
+ return true;
+}
+
+inline
+bool matrix_has_ghost(void)
+{
+ return false;
+}
+
+inline
+bool matrix_is_on(uint8_t row, uint8_t col)
+{
+ return (matrix_debounced[row] & ((matrix_row_t)1<<col));
+}
+
+inline
+matrix_row_t matrix_get_row(uint8_t row)
+{
+ return matrix_debounced[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++) {
+ for (uint8_t j = 0; j < MATRIX_COLS; j++) {
+ if (matrix_is_on(i, j))
+ count++;
+ }
+ }
+ return count;
+}