70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
/*
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* Copyright 2018 Jack Humbert <jack.humb@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "encoder.h"
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#ifndef ENCODER_RESOLUTION
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#define ENCODER_RESOLUTION 4
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#endif
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#ifndef NUMBER_OF_ENCODERS
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#error "Number of encoders not defined by NUMBER_OF_ENCODERS"
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#endif
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#if !defined(ENCODERS_PAD_A) || !defined(ENCODERS_PAD_B)
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#error "No encoder pads defined by ENCODERS_PAD_A and ENCODERS_PAD_B"
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#endif
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static pin_t encoders_pad_a[NUMBER_OF_ENCODERS] = ENCODERS_PAD_A;
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static pin_t encoders_pad_b[NUMBER_OF_ENCODERS] = ENCODERS_PAD_B;
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static int8_t encoder_LUT[] = { 0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0 };
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static uint8_t encoder_state[NUMBER_OF_ENCODERS] = {0};
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static int8_t encoder_value[NUMBER_OF_ENCODERS] = {0};
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__attribute__ ((weak))
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void encoder_update_user(int8_t index, bool clockwise) { }
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__attribute__ ((weak))
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void encoder_update_kb(int8_t index, bool clockwise) {
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encoder_update_user(index, clockwise);
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}
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void encoder_init(void) {
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for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
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setPinInputHigh(encoders_pad_a[i]);
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setPinInputHigh(encoders_pad_b[i]);
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encoder_state[i] = (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
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}
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}
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void encoder_read(void) {
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for (int i = 0; i < NUMBER_OF_ENCODERS; i++) {
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encoder_state[i] <<= 2;
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encoder_state[i] |= (readPin(encoders_pad_a[i]) << 0) | (readPin(encoders_pad_b[i]) << 1);
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encoder_value[i] += encoder_LUT[encoder_state[i] & 0xF];
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if (encoder_value[i] >= ENCODER_RESOLUTION) {
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encoder_update_kb(i, COUNTRECLOCKWISE);
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}
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if (encoder_value[i] <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
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encoder_update_kb(i, CLOCKWISE);
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}
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encoder_value[i] %= ENCODER_RESOLUTION;
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}
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}
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