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/*
Copyright 2018 Jack Humbert <jack.humb@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/>.
*/
#include <avr/io.h>
#include <util/delay.h>
#include <string.h>
#include "matrix.h"
#ifndef DEBOUNCE
# define DEBOUNCE 5
#endif
__attribute__ ((weak))
void matrix_init_kb(void) {
matrix_init_user();
}
__attribute__ ((weak))
void matrix_scan_kb(void) {
matrix_scan_user();
}
__attribute__ ((weak))
void matrix_init_user(void) { }
__attribute__ ((weak))
void matrix_scan_user(void) { }
// #define MATRIX_ROW_PINS { B3, B4, B5, B6, B7 }
// #define MATRIX_COL_PINS { A0, A1, A2, A3, A4, A5, A6, A7, C7, C6, C5, C4, C3, C2, D7 }
static uint8_t debouncing = DEBOUNCE;
static matrix_row_t matrix[MATRIX_ROWS];
static matrix_row_t matrix_debouncing[MATRIX_ROWS];
void matrix_init(void) {
// disables JTAG so we can use them as columns
MCUCSR = (1<<JTD);
MCUCSR = (1<<JTD);
// rows (output)
DDRB |= ((1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
PORTB |= ((1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
// cols (input)
DDRA &= ~((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
DDRC &= ~((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2));
DDRD &= ~((1 << 7));
// pull-up cols
PORTA |= ((1 << 0) | (1 << 1) | (1 << 2) | (1 << 3) | (1 << 4) | (1 << 5) | (1 << 6) | (1 << 7));
PORTC |= ((1 << 7) | (1 << 6) | (1 << 5) | (1 << 4) | (1 << 3) | (1 << 2));
PORTD |= ((1 << 7));
// initialize matrix state: all keys off
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
matrix[row] = 0x00;
matrix_debouncing[row] = 0x00;
}
matrix_init_quantum();
}
uint8_t matrix_scan(void) {
// actual matrix scan
for (uint8_t c = 0; c < MATRIX_ROWS; c++) {
switch (c) {
case 0: PORTB &= ~(1 << 3); break;
case 1: PORTB &= ~(1 << 4); break;
case 2: PORTB &= ~(1 << 5); break;
case 3: PORTB &= ~(1 << 6); break;
case 4: PORTB &= ~(1 << 7); break;
}
_delay_us(5);
matrix_row_t current_row = (
(((PINA & (1 << 0)) ? 0 : 1 ) << 0) |
(((PINA & (1 << 1)) ? 0 : 1 ) << 1) |
(((PINA & (1 << 2)) ? 0 : 1 ) << 2) |
(((PINA & (1 << 3)) ? 0 : 1 ) << 3) |
(((PINA & (1 << 4)) ? 0 : 1 ) << 4) |
(((PINA & (1 << 5)) ? 0 : 1 ) << 5) |
(((PINA & (1 << 6)) ? 0 : 1 ) << 6) |
(((PINA & (1 << 7)) ? 0 : 1 ) << 7) |
(((PINC & (1 << 7)) ? 0 : 1 ) << 8) |
(((PINC & (1 << 6)) ? 0 : 1 ) << 9) |
(((PINC & (1 << 5)) ? 0 : 1 ) << 10) |
(((PINC & (1 << 4)) ? 0 : 1 ) << 11) |
(((PINC & (1 << 3)) ? 0 : 1 ) << 12) |
(((PINC & (1 << 2)) ? 0 : 1 ) << 13) |
(((PIND & (1 << 7)) ? 0 : 1 ) << 14)
);
switch (c) {
case 0: PORTB |= (1 << 3); break;
case 1: PORTB |= (1 << 4); break;
case 2: PORTB |= (1 << 5); break;
case 3: PORTB |= (1 << 6); break;
case 4: PORTB |= (1 << 7); break;
}
if (matrix_debouncing[c] != current_row) {
matrix_debouncing[c] = current_row;
debouncing = DEBOUNCE;
}
}
if (debouncing) {
if (--debouncing) {
_delay_ms(1);
} else {
for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
matrix[i] = matrix_debouncing[i];
}
}
}
matrix_scan_quantum();
return 1;
}
inline matrix_row_t matrix_get_row(uint8_t row) {
return matrix[row];
}
void matrix_print(void) {
}
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