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/*
* 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;
extern const uint16_t PROGMEM encoder_keymaps[][2][2];
/**
* Tap on encoder updates using the encoder keymap
*/
void encoder_update_kb(uint8_t index, bool clockwise) {
int layer = get_highest_layer(layer_state);
uint16_t code;
do {
code = pgm_read_word(&encoder_keymaps[layer--][index][clockwise]);
} while (code == KC_TRNS);
tap_code16(code);
}
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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