2 * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
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.
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.
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/>.
20 #ifndef ENCODER_RESOLUTION
21 #define ENCODER_RESOLUTION 4
24 #ifndef NUMBER_OF_ENCODERS
25 #error "Number of encoders not defined by NUMBER_OF_ENCODERS"
28 #if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
29 #error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
32 static pin_t encoders_pad_a[NUMBER_OF_ENCODERS] = ENCODERS_PAD_A;
33 static pin_t encoders_pad_b[NUMBER_OF_ENCODERS] = ENCODERS_PAD_B;
35 static int8_t encoder_LUT[] = { 0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0 };
37 static uint8_t encoder_state[NUMBER_OF_ENCODERS] = {0};
38 static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
40 __attribute__ ((weak))
41 void encoder_update_user(int8_t index, bool clockwise) { }
43 __attribute__ ((weak))
44 void encoder_update_kb(int8_t index, bool clockwise) {
45 encoder_update_user(index, clockwise);
48 void encoder_init(void) {
49 for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
50 setPinInputHigh(encoders_pad_a[i]);
51 setPinInputHigh(encoders_pad_b[i]);
53 encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
57 void encoder_read(void) {
58 for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
59 encoder_state[i] <<= 2;
60 encoder_state[i] |= (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
61 encoder_value[i] += encoder_LUT[encoder_state[i] & 0xF];
62 if (encoder_value[i] >= ENCODER_RESOLUTION) {
63 encoder_update_kb(i, COUNTRECLOCKWISE);
65 if (encoder_value[i] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
66 encoder_update_kb(i, CLOCKWISE);
68 encoder_value[i] %= ENCODER_RESOLUTION;