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107 lines
2.6 KiB
C
107 lines
2.6 KiB
C
/*
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Copyright 2017 Luiz Ribeiro <luizribeiro@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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#include <avr/io.h>
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#include <util/delay.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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static matrix_row_t matrix[MATRIX_ROWS];
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static matrix_row_t matrix_debouncing[MATRIX_ROWS];
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void matrix_init(void) {
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// all outputs for rows high
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DDRB = 0xFF;
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PORTB = 0xFF;
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// all inputs for columns
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DDRA = 0x00;
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DDRC &= ~(0x111111<<2);
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DDRD &= ~(1<<PIND7);
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// all columns are pulled-up
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PORTA = 0xFF;
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PORTC |= (0b111111<<2);
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PORTD |= (1<<PIND7);
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// initialize matrix state: all keys off
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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matrix[row] = 0x00;
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matrix_debouncing[row] = 0x00;
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}
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}
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void matrix_set_row_status(uint8_t row) {
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DDRB = (1 << row);
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PORTB = ~(1 << row);
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}
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uint8_t bit_reverse(uint8_t x) {
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x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa);
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x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc);
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x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0);
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return x;
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}
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uint8_t matrix_scan(void) {
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for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
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matrix_set_row_status(row);
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_delay_us(5);
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matrix_row_t cols = (
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// cols 0..7, PORTA 0 -> 7
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(~PINA) & 0xFF
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) | (
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// cols 8..13, PORTC 7 -> 0
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bit_reverse((~PINC) & 0xFF) << 8
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) | (
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// col 14, PORTD 7
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((~PIND) & (1 << PIND7)) << 7
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);
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if (matrix_debouncing[row] != cols) {
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matrix_debouncing[row] = cols;
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debouncing = DEBOUNCE;
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}
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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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matrix_scan_user();
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return 1;
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}
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inline matrix_row_t matrix_get_row(uint8_t row) {
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return matrix[row];
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}
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void matrix_print(void) {
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}
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