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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"
#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};
static int8_t encoder_pulses[NUMBER_OF_ENCODERS] = {0};
#ifdef SPLIT_KEYBOARD
// right half encoders come over as second set of encoders
static uint8_t encoder_value[NUMBER_OF_ENCODERS * 2] = {0};
// row offsets for each hand
static uint8_t thisHand, thatHand;
#else
static uint8_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) {
uint8_t i = index;
#ifdef SPLIT_KEYBOARD
index += thisHand;
#endif
encoder_pulses[i] += encoder_LUT[state & 0xF];
if (encoder_pulses[i] >= ENCODER_RESOLUTION) {
encoder_value[index]++;
encoder_update_kb(index, true);
}
if (encoder_pulses[i] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
encoder_value[index]--;
encoder_update_kb(index, false);
}
encoder_pulses[i] %= ENCODER_RESOLUTION;
}
void encoder_read(void) {
for (uint8_t 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);
encoder_update(i, encoder_state[i]);
}
}
#ifdef SPLIT_KEYBOARD
void encoder_state_raw(uint8_t* slave_state) { memcpy(slave_state, &encoder_value[thisHand], sizeof(uint8_t) * NUMBER_OF_ENCODERS); }
void encoder_update_raw(uint8_t* slave_state) {
for (uint8_t i = 0; i < NUMBER_OF_ENCODERS; i++) {
uint8_t index = i + thatHand;
int8_t delta = slave_state[i] - encoder_value[index];
while (delta > 0) {
delta--;
encoder_value[index]++;
encoder_update_kb(index, true);
}
while (delta < 0) {
delta++;
encoder_value[index]--;
encoder_update_kb(index, false);
}
}
}
#endif
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