/*
Copyright 2012 Jun Wako <[email protected]>

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"
#include "rgblight.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)
{
	// To use PORTF disable JTAG with writing JTD bit twice within four cycles.
	MCUCR |= (1<<JTD);
	MCUCR |= (1<<JTD);

	backlight_init_ports();

	// 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;
	}
	rgblight_init();
}

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
* pin: D4, C6, D7, E6
*/

static void  init_cols(void)
{
	// Input with pull-up(DDR:0, PORT:1)
	DDRC  &= ~(1<<6);
	PORTC |=  (1<<6);
	DDRD  &= ~(1<<4 | 1<<7 );
	PORTD |=  (1<<4 | 1<<7 );
	DDRE  &= ~(1<<6);
	PORTE |=  (1<<6);
}

static matrix_row_t read_cols(void)
{

	//LED on Top of switch
	return (PIND&(1<<4) ? 0 : (1<<0)) |
	(PINC&(1<<6) ? 0 : (1<<1)) |
	(PIND&(1<<7) ? 0 : (1<<2)) |
	(PINE&(1<<6) ? 0 : (1<<3));
}

/* Row pin configuration
* row: 0   1   2 
* pin: B4, B5, B6
*/

static void unselect_rows(void)
{
	// Hi-Z(DDR:0, PORT:0) to unselect
	DDRB  &= ~0b01110000;
	PORTB &= ~0b01110000;
}

static void select_row(uint8_t row)
{
	// Output low(DDR:1, PORT:0) to select
	//LED on Top of switch
	switch (row) {
	case 0:
		DDRB  |= (1<<4);
		PORTB &= ~(1<<4);
		break;
	case 1:
		DDRB  |= (1<<5);
		PORTB &= ~(1<<5);
		break;
	case 2:
		DDRB  |= (1<<6);
		PORTB &= ~(1<<6);
		break;
	}
	
	bl_set();
}