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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"
#ifndef ENCODER_RESOLUTION
#define ENCODER_RESOLUTION 4
#endif
#ifndef NUMBER_OF_ENCODERS
#error "Number of encoders not defined by NUMBER_OF_ENCODERS"
#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 pin_t encoders_pad_a[NUMBER_OF_ENCODERS] = ENCODERS_PAD_A;
static pin_t 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++) {
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);
}
}
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);
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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