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qmk_firmware

custom branch of QMK firmware git clone https://anongit.hacktivis.me/git/qmk_firmware.git

torn_encoder.c (2891B)

    

  1. /*
  2.  * Copyright 2020 Richard Titmuss <richard.titmuss@gmail.com>
  3.  * Copyright 2018 Jack Humbert <jack.humb@gmail.com>
  4.  *
  5.  * This program is free software: you can redistribute it and/or modify
  6.  * it under the terms of the GNU General Public License as published by
  7.  * the Free Software Foundation, either version 2 of the License, or
  8.  * (at your option) any later version.
  9.  *
  10.  * This program is distributed in the hope that it will be useful,
  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13.  * GNU General Public License for more details.
  14.  *
  15.  * You should have received a copy of the GNU General Public License
  16.  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  17.  */
  19. #include "torn.h"
  20. #include "mcp23018.h"
  22. #ifndef ENCODER_RESOLUTION
  23. #    define ENCODER_RESOLUTION 4
  24. #endif
  26. #define ENCODER_CLOCKWISE true
  27. #define ENCODER_COUNTER_CLOCKWISE false
  29. static int8_t encoder_LUT[] = {0, -1, 1, 0, 1, 0, 0, -1, -1, 0, 0, 1, 0, 1, -1, 0};
  31. static uint8_t encoder_state  = 0;
  32. static int8_t  encoder_pulses = 0;
  34. __attribute__((weak)) extern const uint16_t PROGMEM encoder_keymaps[][2][2];
  36. const uint16_t encoder_default[2][2] =  { { KC_PGDN, KC_PGUP }, { KC_VOLD, KC_VOLU } };
  38. /**
  39.  * Tap on encoder updates using the encoder keymap
  40.  */
  41. bool encoder_update_kb(uint8_t index, bool clockwise) {
  42.     // if (!encoder_update_user(index, clockwise)) return false;
  44.     uint16_t code;
  46.     if (encoder_keymaps) {
  47.       uint8_t layer = get_highest_layer(layer_state);
  48.       do {
  49.           code = pgm_read_word(&encoder_keymaps[layer--][index][clockwise]);
  50.       } while (code == KC_TRNS);
  51.     } else {
  52.       code = encoder_default[index][clockwise];
  53.     }
  55.     tap_code16(code);
  56.     return true;
  57. }
  59. static bool encoder_read_state(uint8_t *state) {
  60.     uint8_t           mcp23018_pin_state;
  61.     mcp23018_status_t status = mcp23018_readReg(GPIOB, &mcp23018_pin_state, 1);
  62.     if (status == 0) {
  63.         *state = (mcp23018_pin_state & 0b110000) >> 4;
  64.         return true;
  65.     }
  66.     return false;
  67. }
  69. static void encoder_update(int8_t index, uint8_t state) {
  70.     encoder_pulses += encoder_LUT[state & 0xF];
  71.     if (encoder_pulses >= ENCODER_RESOLUTION) {
  72.         encoder_update_kb(index, ENCODER_CLOCKWISE);
  73.     }
  74.     if (encoder_pulses <= -ENCODER_RESOLUTION) {  // direction is arbitrary here, but this clockwise
  75.         encoder_update_kb(index, ENCODER_COUNTER_CLOCKWISE);
  76.     }
  77.     encoder_pulses %= ENCODER_RESOLUTION;
  78. }
  80. /**
  81.  * Read the secondary encoder over i2c
  82.  */
  83. void secondary_encoder_read(void) {
  84.     uint8_t state;
  85.     if (encoder_read_state(&state)) {
  86.         encoder_state <<= 2;
  87.         encoder_state |= state;
  88.         encoder_update(1, encoder_state);
  89.     }
  90. }
  92. /**
  93.  * Initialize the secondary encoder over i2c
  94.  */
  95. void secondary_encoder_init(void) { encoder_read_state(&encoder_state); }