173 wiersze
4.0 KiB
C
173 wiersze
4.0 KiB
C
/*
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Copyright 2012 Jun Wako <wakojun@gmail.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* scan matrix
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*/
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#include <stdint.h>
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#include <stdbool.h>
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#include <avr/io.h>
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#include <util/delay.h>
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#include "print.h"
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#include "debug.h"
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#include "util.h"
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#include "matrix.h"
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#ifndef DEBOUNCE
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# define DEBOUNCE 5
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#endif
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static uint8_t debouncing = DEBOUNCE;
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/* matrix state(1:on, 0:off) */
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static matrix_row_t matrix[MATRIX_ROWS];
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static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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static matrix_row_t read_cols(void);
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static void init_cols(void);
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static void unselect_rows(void);
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static void select_row(uint8_t row);
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#define LED_ON() do { DDRC |= (1<<5); PORTC |= (1<<5); } while (0)
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#define LED_OFF() do { DDRC &= ~(1<<5); PORTC &= ~(1<<5); } while (0)
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#define LED_TGL() do { DDRC |= (1<<5); PINC |= (1<<5); } while (0)
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void matrix_init(void)
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{
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// initialize row and col
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unselect_rows();
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init_cols();
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// initialize matrix state: all keys off
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for (uint8_t i=0; i < MATRIX_ROWS; i++) {
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matrix[i] = 0;
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matrix_debouncing[i] = 0;
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}
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//debug
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debug_matrix = true;
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LED_ON();
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_delay_ms(500);
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LED_OFF();
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}
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uint8_t matrix_scan(void)
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{
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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select_row(i);
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_delay_us(30); // without this wait read unstable value.
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matrix_row_t cols = read_cols();
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if (matrix_debouncing[i] != cols) {
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matrix_debouncing[i] = cols;
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if (debouncing) {
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debug("bounce!: "); debug_hex(debouncing); debug("\n");
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}
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debouncing = DEBOUNCE;
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}
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unselect_rows();
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}
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if (debouncing) {
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if (--debouncing) {
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_delay_ms(1);
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} else {
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for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
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matrix[i] = matrix_debouncing[i];
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}
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}
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}
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return 1;
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}
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inline
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matrix_row_t matrix_get_row(uint8_t row)
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{
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return matrix[row];
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}
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/* Column pin configuration
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* col: 0 1 2 3 4 5 6 7
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* pin: B0 B1 B2 B3 B4 B5 B6 B7
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*/
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static void init_cols(void)
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{
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// Input with pull-up(DDR:0, PORT:1)
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DDRB &= ~0b11111111;
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PORTB |= 0b11111111;
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}
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/* Returns status of switches(1:on, 0:off) */
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static matrix_row_t read_cols(void)
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{
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// Invert because PIN indicates 'switch on' with low(0) and 'off' with high(1)
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return ~PINB;
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}
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/* Row pin configuration
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* row: 0 1 2 3 4 5 6 7
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* pin: D0 D1 D2 D3 D4 D5 D6 C2
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*/
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static void unselect_rows(void)
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{
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// Hi-Z(DDR:0, PORT:0) to unselect
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DDRD &= ~0b01111111;
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PORTD &= ~0b01111111;
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DDRC &= ~0b00000100;
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PORTC &= ~0b00000100;
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}
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static void select_row(uint8_t row)
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{
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// Output low(DDR:1, PORT:0) to select
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switch (row) {
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case 0:
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DDRD |= (1<<0);
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PORTD &= ~(1<<0);
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break;
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case 1:
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DDRD |= (1<<1);
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PORTD &= ~(1<<1);
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break;
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case 2:
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DDRD |= (1<<2);
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PORTD &= ~(1<<2);
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break;
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case 3:
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DDRD |= (1<<3);
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PORTD &= ~(1<<3);
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break;
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case 4:
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DDRD |= (1<<4);
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PORTD &= ~(1<<4);
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break;
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case 5:
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DDRD |= (1<<5);
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PORTD &= ~(1<<5);
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break;
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case 6:
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DDRD |= (1<<6);
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PORTD &= ~(1<<6);
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break;
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case 7:
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DDRC |= (1<<2);
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PORTC &= ~(1<<2);
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break;
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}
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}
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