70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
/*
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Copyright 2017 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 "debug.h"
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#include "timer.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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/* matrix state(1:on, 0:off) */
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static matrix_row_t row_debounced = 0;
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static matrix_row_t row_debouncing = 0;
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static bool debouncing = false;
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static uint16_t debouncing_time = 0;
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void matrix_init(void)
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{
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debug_enable = true;
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debug_matrix = true;
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debug_mouse = true;
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// PB0: Input with pull-up(DDR:0, PORT:1)
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DDRB &= ~(1<<0);
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PORTB |= (1<<0);
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}
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uint8_t matrix_scan(void)
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{
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matrix_row_t r = (PINB&(1<<0) ? 0 : 1);
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if (row_debouncing != r) {
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row_debouncing = r;
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debouncing = true;
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debouncing_time = timer_read();
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}
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if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
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row_debounced = row_debouncing;
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debouncing = false;
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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 row_debounced;
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}
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