- /*
- * 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"
- #ifdef SPLIT_KEYBOARD
- # include "split_util.h"
- #endif
-
- // for memcpy
- #include <string.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
-
- #define NUMBER_OF_ENCODERS (sizeof(encoders_pad_a) / sizeof(pin_t))
- static pin_t encoders_pad_a[] = ENCODERS_PAD_A;
- static pin_t encoders_pad_b[] = 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};
-
- #ifdef SPLIT_KEYBOARD
- // right half encoders come over as second set of encoders
- static int8_t encoder_value[NUMBER_OF_ENCODERS * 2] = {0};
- // row offsets for each hand
- static uint8_t thisHand, thatHand;
- #else
- static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
- #endif
-
- __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) {
- #if defined(SPLIT_KEYBOARD) && defined(ENCODERS_PAD_A_RIGHT) && defined(ENCODERS_PAD_B_RIGHT)
- if (!isLeftHand) {
- const pin_t encoders_pad_a_right[] = ENCODERS_PAD_A_RIGHT;
- const pin_t encoders_pad_b_right[] = ENCODERS_PAD_B_RIGHT;
- for (uint8_t i = 0; i < NUMBER_OF_ENCODERS; i++) {
- encoders_pad_a[i] = encoders_pad_a_right[i];
- encoders_pad_b[i] = encoders_pad_b_right[i];
- }
- }
- #endif
-
- for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
- setPinInputHigh(encoders_pad_a[i]);
- setPinInputHigh(encoders_pad_b[i]);
-
- encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
- }
-
- #ifdef SPLIT_KEYBOARD
- thisHand = isLeftHand ? 0 : NUMBER_OF_ENCODERS;
- thatHand = NUMBER_OF_ENCODERS - thisHand;
- #endif
- }
-
- static void encoder_update(int8_t index, uint8_t state) {
- encoder_value[index] += encoder_LUT[state & 0xF];
- if (encoder_value[index] >= ENCODER_RESOLUTION) {
- encoder_update_kb(index, false);
- }
- if (encoder_value[index] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
- encoder_update_kb(index, true);
- }
- encoder_value[index] %= ENCODER_RESOLUTION;
- }
-
- void encoder_read(void) {
- for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
- encoder_state[i] <<= 2;
- encoder_state[i] |= (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
- #if SPLIT_KEYBOARD
- encoder_update(i + thisHand, encoder_state[i]);
- #else
- encoder_update(i, encoder_state[i]);
- #endif
- }
- }
-
- #ifdef SPLIT_KEYBOARD
- void encoder_state_raw(uint8_t* slave_state) { memcpy(slave_state, encoder_state, sizeof(encoder_state)); }
-
- void encoder_update_raw(uint8_t* slave_state) {
- for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
- encoder_update(i + thatHand, slave_state[i]);
- }
- }
- #endif
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