146 lines
4.1 KiB
C
146 lines
4.1 KiB
C
/*
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Copyright 2018 Jack Humbert <jack.humb@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 <string.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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__attribute__ ((weak))
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void matrix_init_kb(void) {
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matrix_init_user();
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}
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__attribute__ ((weak))
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void matrix_scan_kb(void) {
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matrix_scan_user();
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}
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__attribute__ ((weak))
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void matrix_init_user(void) { }
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__attribute__ ((weak))
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void matrix_scan_user(void) { }
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// #define MATRIX_ROW_PINS { B3, B4, B5, B6, B7 }
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// #define MATRIX_COL_PINS { A0, A1, A2, A3, A4, A5, A6, A7, C7, C6, C5, C4, C3, C2, D7 }
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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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// disables JTAG so we can use them as columns
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MCUCSR = (1<<JTD);
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MCUCSR = (1<<JTD);
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// rows (output)
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DDRB |= ((1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
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PORTB |= ((1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
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// cols (input)
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DDRA &= ~((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
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DDRC &= ~((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2));
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DDRD &= ~((1 << 7));
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// pull-up cols
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PORTA |= ((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
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PORTC |= ((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2));
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PORTD |= ((1 << 7));
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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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matrix_init_quantum();
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}
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uint8_t matrix_scan(void) {
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// actual matrix scan
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for (uint8_t c = 0; c < MATRIX_ROWS; c++) {
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switch (c) {
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case 0: PORTB &= ~(1 << 3); break;
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case 1: PORTB &= ~(1 << 4); break;
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case 2: PORTB &= ~(1 << 5); break;
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case 3: PORTB &= ~(1 << 6); break;
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case 4: PORTB &= ~(1 << 7); break;
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}
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_delay_us(5);
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matrix_row_t current_row = (
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(((PINA & (1 << 0)) ? 0 : 1 ) << 0) |
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(((PINA & (1 << 1)) ? 0 : 1 ) << 1) |
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(((PINA & (1 << 2)) ? 0 : 1 ) << 2) |
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(((PINA & (1 << 3)) ? 0 : 1 ) << 3) |
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(((PINA & (1 << 4)) ? 0 : 1 ) << 4) |
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(((PINA & (1 << 5)) ? 0 : 1 ) << 5) |
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(((PINA & (1 << 6)) ? 0 : 1 ) << 6) |
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(((PINA & (1 << 7)) ? 0 : 1 ) << 7) |
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(((PINC & (1 << 7)) ? 0 : 1 ) << 8) |
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(((PINC & (1 << 6)) ? 0 : 1 ) << 9) |
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(((PINC & (1 << 5)) ? 0 : 1 ) << 10) |
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(((PINC & (1 << 4)) ? 0 : 1 ) << 11) |
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(((PINC & (1 << 3)) ? 0 : 1 ) << 12) |
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(((PINC & (1 << 2)) ? 0 : 1 ) << 13) |
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(((PIND & (1 << 7)) ? 0 : 1 ) << 14)
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);
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switch (c) {
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case 0: PORTB |= (1 << 3); break;
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case 1: PORTB |= (1 << 4); break;
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case 2: PORTB |= (1 << 5); break;
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case 3: PORTB |= (1 << 6); break;
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case 4: PORTB |= (1 << 7); break;
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}
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if (matrix_debouncing[c] != current_row) {
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matrix_debouncing[c] = current_row;
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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_quantum();
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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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