mirror of
https://github.com/Keychron/qmk_firmware.git
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96 lines
2.8 KiB
C
96 lines
2.8 KiB
C
/*
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* Copyright 2020 Richard Titmuss <richard.titmuss@gmail.com>
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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 "torn.h"
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#include "mcp23018.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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#define ENCODER_CLOCKWISE true
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#define ENCODER_COUNTER_CLOCKWISE false
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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 = 0;
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static int8_t encoder_pulses = 0;
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__attribute__((weak)) extern const uint16_t PROGMEM encoder_keymaps[][2][2];
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const uint16_t encoder_default[2][2] = { { KC_PGDN, KC_PGUP }, { KC__VOLDOWN, KC__VOLUP } };
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/**
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* Tap on encoder updates using the encoder keymap
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*/
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bool encoder_update_kb(uint8_t index, bool clockwise) {
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// if (!encoder_update_user(index, clockwise)) return false;
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uint16_t code;
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if (encoder_keymaps) {
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uint8_t layer = get_highest_layer(layer_state);
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do {
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code = pgm_read_word(&encoder_keymaps[layer--][index][clockwise]);
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} while (code == KC_TRNS);
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} else {
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code = encoder_default[index][clockwise];
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}
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tap_code16(code);
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return true;
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}
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static bool encoder_read_state(uint8_t *state) {
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uint8_t mcp23018_pin_state;
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mcp23018_status_t status = mcp23018_readReg(GPIOB, &mcp23018_pin_state, 1);
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if (status == 0) {
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*state = (mcp23018_pin_state & 0b110000) >> 4;
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return true;
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}
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return false;
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}
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static void encoder_update(int8_t index, uint8_t state) {
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encoder_pulses += encoder_LUT[state & 0xF];
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if (encoder_pulses >= ENCODER_RESOLUTION) {
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encoder_update_kb(index, ENCODER_CLOCKWISE);
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}
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if (encoder_pulses <= -ENCODER_RESOLUTION) { // direction is arbitrary here, but this clockwise
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encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
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}
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encoder_pulses %= ENCODER_RESOLUTION;
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}
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/**
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* Read the secondary encoder over i2c
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*/
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void secondary_encoder_read(void) {
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uint8_t state;
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if (encoder_read_state(&state)) {
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encoder_state <<= 2;
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encoder_state |= state;
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encoder_update(1, encoder_state);
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}
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}
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/**
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* Initialize the secondary encoder over i2c
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*/
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void secondary_encoder_init(void) { encoder_read_state(&encoder_state); }
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