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- /*
- Copyright 2019, Aleksadar Prokic <spinoses@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/>.
- */
- /*
- * scan matrix
- */
- #include <stdint.h>
- #include <stdbool.h>
- #include <avr/io.h>
- #include <util/delay.h>
- #include "print.h"
- #include "debug.h"
- #include "util.h"
- #include "matrix.h"
- #ifndef DEBOUNCE
- # define DEBOUNCE 5
- #endif
- static uint8_t debouncing = DEBOUNCE;
- /* matrix state(1:on, 0:off) */
- static matrix_row_t matrix[MATRIX_ROWS];
- static matrix_row_t matrix_debouncing[MATRIX_ROWS];
- static matrix_row_t read_cols(void);
- static void init_cols(void);
- static void unselect_rows(void);
- static void select_row(uint8_t row);
- void matrix_init(void)
- {
- // initialize row and col
- unselect_rows();
- init_cols();
- // initialize matrix state: all keys off
- for (uint8_t i=0; i < MATRIX_ROWS; i++) {
- matrix[i] = 0;
- matrix_debouncing[i] = 0;
- }
- }
- uint8_t matrix_scan(void)
- {
- for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- select_row(i);
- _delay_us(30); // without this wait read unstable value.
- matrix_row_t cols = read_cols();
- if (matrix_debouncing[i] != cols) {
- matrix_debouncing[i] = cols;
- if (debouncing) {
- debug("bounce!: "); debug_hex(debouncing); debug("\n");
- }
- debouncing = DEBOUNCE;
- }
- unselect_rows();
- }
- if (debouncing) {
- if (--debouncing) {
- _delay_ms(1);
- } else {
- for (uint8_t i = 0; i < MATRIX_ROWS; i++) {
- matrix[i] = matrix_debouncing[i];
- }
- }
- }
- return 1;
- }
- inline
- matrix_row_t matrix_get_row(uint8_t row)
- {
- return matrix[row];
- }
- /* Column pin configuration
- * col: 0 1 2 3 4 5 6 7 8 9 10 11 12 13
- * pin: F0 F1 E6 C7 C6 B6 D4 B1 B0 B5 B4 D7 D6 B3 (Rev.A)
- * pin: B7 (Rev.B)
- */
- static void init_cols(void)
- {
- // Input with pull-up(DDR:0, PORT:1)
- DDRF &= ~(1<<7);
- PORTF |= (1<<7);
- DDRB &= ~(1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<3 | 1<<2 | 1<<1);
- PORTB |= (1<<7 | 1<<6 | 1<<5 | 1<<4 | 1<<3 | 1<<2 | 1<<1);
- DDRD &= ~(1<<7 | 1<<3 | 1<<2 | 1<<1 | 1<<0 );
- PORTD |= (1<<7 | 1<<3 | 1<<2 | 1<<1 | 1<<0 );
- DDRC &= ~(1<<7 | 1<<6);
- PORTC |= (1<<7 | 1<<6);
- }
- static matrix_row_t read_cols(void)
- {
- return (PINF&(1<<7) ? 0 : (1<<0)) |
- (PINB&(1<<6) ? 0 : (1<<1)) |
- (PINB&(1<<5) ? 0 : (1<<2)) |
- (PINB&(1<<4) ? 0 : (1<<3)) |
- (PIND&(1<<7) ? 0 : (1<<4)) |
- (PINC&(1<<7) ? 0 : (1<<5)) |
- (PINC&(1<<6) ? 0 : (1<<6)) |
- (PIND&(1<<3) ? 0 : (1<<7)) |
- (PIND&(1<<2) ? 0 : (1<<8)) |
- (PIND&(1<<1) ? 0 : (1<<9)) |
- (PIND&(1<<0) ? 0 : (1<<10)) |
- (PINB&(1<<7) ? 0 : (1<<11)) |
- (PINB&(1<<3) ? 0 : (1<<12)) |
- (PINB&(1<<2) ? 0 : (1<<13)) |
- (PINB&(1<<1) ? 0 : (1<<14));
- }
- /* Row pin configuration
- * row: 0 1 2 3 4
- * pin: D0 D1 D2 D3 D5
- */
- static void unselect_rows(void)
- {
- // Hi-Z(DDR:0, PORT:0) to unselect
- DDRF &= ~0b01110011;
- PORTF &= ~0b01110011;
- }
- static void select_row(uint8_t row)
- {
- // Output low(DDR:1, PORT:0) to select
- switch (row) {
- case 0:
- DDRF |= (1<<0);
- PORTF &= ~(1<<0);
- break;
- case 1:
- DDRF |= (1<<1);
- PORTF &= ~(1<<1);
- break;
- case 2:
- DDRF |= (1<<4);
- PORTF &= ~(1<<4);
- break;
- case 3:
- DDRF |= (1<<5);
- PORTF &= ~(1<<5);
- break;
- case 4:
- DDRF |= (1<<6);
- PORTF &= ~(1<<6);
- break;
- }
- }
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