123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133 |
- /*
- Copyright 2012 Jun Wako <[email protected]>
-
- 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)
- {
- debug_enable = true;
- debug_matrix = true;
- debug_mouse = true;
- // 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
- * pin: B0
- */
- static void init_cols(void)
- {
- // Input with pull-up(DDR:0, PORT:1)
- DDRB &= ~(1<<0);
- PORTB |= (1<<0);
- }
-
- static matrix_row_t read_cols(void)
- {
- return (PINB&(1<<0) ? 0 : (1<<0));
- }
-
- /* Row pin configuration
- * row: 0
- * pin: B1
- */
- static void unselect_rows(void)
- {
- // Hi-Z(DDR:0, PORT:0) to unselect
- DDRB &= ~0b00000010;
- PORTB &= ~0b00000010;
- }
-
- static void select_row(uint8_t row)
- {
- // Output low(DDR:1, PORT:0) to select
- switch (row) {
- case 0:
- DDRB |= (1<<1);
- PORTB &= ~(1<<1);
- break;
- }
- }
|