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