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tmk_keyboard/keyboard/luddite/matrix.c

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2018-04-12 00:49:34 +00:00
/*
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"
#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);
#define LED_ON() do { DDRB |= (1<<0); PORTB |= (1<<0); } while (0)
#define LED_OFF() do { DDRB &= ~(1<<0); PORTB &= ~(1<<0); } while (0)
#define LED_TGL() do { DDRB |= (1<<0); PINB |= (1<<0); } while (0)
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();
rgblight_init();
// 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;
}
//debug
debug_matrix = true;
LED_ON();
_delay_ms(500);
LED_OFF();
}
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;
}
inline
matrix_row_t matrix_get_row(uint8_t row)
{
return matrix[row];
}
/* Column pin configuration
* col: 0 1 2 3 4 5 6 7
* pin: F4 F5 F6 F7 B1 B3 B2 B6
*/
static void init_cols(void)
{
// Input with pull-up(DDR:0, PORT:1)
DDRB &= ~0b01001110;
PORTB |= 0b01001110;
DDRF &= ~0b11110000;
PORTF |= 0b11110000;
}
/* Returns status of switches(1:on, 0:off) */
static matrix_row_t read_cols(void)
{
return (PINF&(1<<4) ? 0 : (1<<0)) |
(PINF&(1<<5) ? 0 : (1<<1)) |
(PINF&(1<<6) ? 0 : (1<<2)) |
(PINF&(1<<7) ? 0 : (1<<3)) |
(PINB&(1<<1) ? 0 : (1<<4)) |
(PINB&(1<<3) ? 0 : (1<<5)) |
(PINB&(1<<2) ? 0 : (1<<6)) |
(PINB&(1<<6) ? 0 : (1<<7)) ;
}
/* Row pin configuration
* row: 0 1 2 3 4 5 6 7
* pin: D3 D2 D1 D0 D4 C6 D7 E6
*/
static void unselect_rows(void)
{
// Hi-Z(DDR:0, PORT:0) to unselect
DDRC &= ~0b01000000;
PORTC &= ~0b01000000;
DDRD &= ~0b10011111;
PORTD &= ~0b10011111;
DDRE &= ~0b01000000;
PORTE &= ~0b01000000;
}
static void select_row(uint8_t row)
{
// Output low(DDR:1, PORT:0) to select
switch (row) {
case 0:
DDRD |= (1<<3);
PORTD &= ~(1<<3);
break;
case 1:
DDRD |= (1<<2);
PORTD &= ~(1<<2);
break;
case 2:
DDRD |= (1<<1);
PORTD &= ~(1<<1);
break;
case 3:
DDRD |= (1<<0);
PORTD &= ~(1<<0);
break;
case 4:
DDRD |= (1<<4);
PORTD &= ~(1<<4);
break;
case 5:
DDRC |= (1<<6);
PORTC &= ~(1<<6);
break;
case 6:
DDRD |= (1<<7);
PORTD &= ~(1<<7);
break;
case 7:
DDRE |= (1<<6);
PORTE &= ~(1<<6);
break;
}
}