diff options
Diffstat (limited to 'keyboards/facew/matrix.c')
-rw-r--r-- | keyboards/facew/matrix.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/keyboards/facew/matrix.c b/keyboards/facew/matrix.c new file mode 100644 index 000000000..57aa36b5f --- /dev/null +++ b/keyboards/facew/matrix.c @@ -0,0 +1,106 @@ +/* +Copyright 2017 Luiz Ribeiro <luizribeiro@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 "matrix.h" + +#ifndef DEBOUNCE +#define DEBOUNCE 5 +#endif + +static uint8_t debouncing = DEBOUNCE; + +static matrix_row_t matrix[MATRIX_ROWS]; +static matrix_row_t matrix_debouncing[MATRIX_ROWS]; + +void matrix_init(void) { + // all outputs for rows high + DDRB = 0xFF; + PORTB = 0xFF; + // all inputs for columns + DDRA = 0x00; + DDRC &= ~(0x111111<<2); + DDRD &= ~(1<<PIND7); + // all columns are pulled-up + PORTA = 0xFF; + PORTC |= (0b111111<<2); + PORTD |= (1<<PIND7); + + // initialize matrix state: all keys off + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + matrix[row] = 0x00; + matrix_debouncing[row] = 0x00; + } +} + +void matrix_set_row_status(uint8_t row) { + DDRB = (1 << row); + PORTB = ~(1 << row); +} + +uint8_t bit_reverse(uint8_t x) { + x = ((x >> 1) & 0x55) | ((x << 1) & 0xaa); + x = ((x >> 2) & 0x33) | ((x << 2) & 0xcc); + x = ((x >> 4) & 0x0f) | ((x << 4) & 0xf0); + return x; +} + +uint8_t matrix_scan(void) { + for (uint8_t row = 0; row < MATRIX_ROWS; row++) { + matrix_set_row_status(row); + _delay_us(5); + + matrix_row_t cols = ( + // cols 0..7, PORTA 0 -> 7 + (~PINA) & 0xFF + ) | ( + // cols 8..13, PORTC 7 -> 0 + bit_reverse((~PINC) & 0xFF) << 8 + ) | ( + // col 14, PORTD 7 + ((~PIND) & (1 << PIND7)) << 7 + ); + + if (matrix_debouncing[row] != cols) { + matrix_debouncing[row] = cols; + 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_user(); + + return 1; +} + +inline matrix_row_t matrix_get_row(uint8_t row) { + return matrix[row]; +} + +void matrix_print(void) { +} |