keyboard/onekey/onekey.c

   1 /*
   2 Copyright 2017 Jun Wako <wakojun@gmail.com>
   3
   4 This program is free software: you can redistribute it and/or modify
   5 it under the terms of the GNU General Public License as published by
   6 the Free Software Foundation, either version 2 of the License, or
   7 (at your option) any later version.
   8
   9 This program is distributed in the hope that it will be useful,
  10 but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 GNU General Public License for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16 */
  17
  18 /*
  19  * scan matrix
  20  */
  21 #include <stdint.h>
  22 #include <stdbool.h>
  23 #include <avr/io.h>
  24 #include "debug.h"
  25 #include "timer.h"
  26 #include "matrix.h"
  27
  28
  29 #ifndef DEBOUNCE
  30 #   define DEBOUNCE     5
  31 #endif
  32 /* matrix state(1:on, 0:off) */
  33 static matrix_row_t row_debounced = 0;
  34 static matrix_row_t row_debouncing = 0;
  35 static bool debouncing = false;
  36 static uint16_t debouncing_time = 0;
  37
  38
  39 void matrix_init(void)
  40 {
  41     debug_enable = true;
  42     debug_matrix = true;
  43     debug_mouse = true;
  44
  45     // PB0: Input with pull-up(DDR:0, PORT:1)
  46     DDRB  &= ~(1<<0);
  47     PORTB |=  (1<<0);
  48 }
  49
  50 uint8_t matrix_scan(void)
  51 {
  52     matrix_row_t r = (PINB&(1<<0) ? 0 : 1);
  53     if (row_debouncing != r) {
  54         row_debouncing = r;
  55         debouncing = true;
  56         debouncing_time = timer_read();
  57     }
  58
  59     if (debouncing && timer_elapsed(debouncing_time) > DEBOUNCE) {
  60         row_debounced = row_debouncing;
  61         debouncing = false;
  62     }
  63     return 1;
  64 }
  65
  66 inline
  67 matrix_row_t matrix_get_row(uint8_t row)
  68 {
  69     return row_debounced;
  70 }