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- /*
- * Copyright 2018 Jack Humbert <jack.humb@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 "encoder.h"
- #include "quantum.h"
-
- #ifndef ENCODER_RESOLUTION
- #define ENCODER_RESOLUTION 4
- #endif
-
- #if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
- #error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
- #endif
-
- static LINE_TYPE encoders_pad_a[NUMBER_OF_ENCODERS] = ENCODERS_PAD_A;
- static LINE_TYPE encoders_pad_b[NUMBER_OF_ENCODERS] = ENCODERS_PAD_B;
-
- static int8_t encoder_LUT[] = { 0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0 };
-
- static uint8_t encoder_state[NUMBER_OF_ENCODERS] = {0};
- static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
-
- __attribute__ ((weak))
- void encoder_update_user(int8_t index, bool clockwise) { }
-
- __attribute__ ((weak))
- void encoder_update_kb(int8_t index, bool clockwise) {
- encoder_update_user(index, clockwise);
- }
-
- void encoder_init(void) {
- for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
- setPadMode(encoders_pad_a[i], PAD_MODE_INPUT);
- setPadMode(encoders_pad_b[i], PAD_MODE_INPUT);
-
- encoder_state[i] = (readPad(encoders_pad_a[i]) << 0) | (readPad(encoders_pad_b[i]) << 1);
- }
- }
-
- void encoder_read(void) {
- for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
- encoder_state[i] <<= 2;
- encoder_state[i] |= (readPad(encoders_pad_a[i]) << 0) | (readPad(encoders_pad_b[i]) << 1);
- encoder_value[i] += encoder_LUT[encoder_state[i] & 0xF];
- if (encoder_value[i] >= ENCODER_RESOLUTION) {
- encoder_update_kb(i, COUNTRECLOCKWISE);
- }
- if (encoder_value[i] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
- encoder_update_kb(i, CLOCKWISE);
- }
- encoder_value[i] %= ENCODER_RESOLUTION;
- }
- }
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