qmk-dactyl-manuform-a/keyboards/ploopyco/trackball_nano/trackball_nano.c

/* Copyright 2021 Colin Lam (Ploopy Corporation)
 * Copyright 2020 Christopher Courtney, aka Drashna Jael're  (@drashna) <drashna@live.com>
 * Copyright 2019 Sunjun Kim
 * Copyright 2019 Hiroyuki Okada
 *
 * 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 "trackball_nano.h"
#include "wait.h"

#ifndef OPT_DEBOUNCE
#    define OPT_DEBOUNCE 5  // (ms) 			Time between scroll events
#endif

#ifndef SCROLL_BUTT_DEBOUNCE
#    define SCROLL_BUTT_DEBOUNCE 100  // (ms) 			Time between scroll events
#endif

#ifndef OPT_THRES
#    define OPT_THRES 150  // (0-1024) 	Threshold for actication
#endif

#ifndef OPT_SCALE
#    define OPT_SCALE 1  // Multiplier for wheel
#endif

#ifndef PLOOPY_DPI_OPTIONS
#    define PLOOPY_DPI_OPTIONS \
        { 375, 750, 1375 }
#    ifndef PLOOPY_DPI_DEFAULT
#        define PLOOPY_DPI_DEFAULT 2
#    endif
#endif

#ifndef PLOOPY_DPI_DEFAULT
#    define PLOOPY_DPI_DEFAULT 2
#endif

const uint16_t PROGMEM keymaps[][MATRIX_ROWS][MATRIX_COLS] = { };

keyboard_config_t keyboard_config;
uint16_t          dpi_array[] = PLOOPY_DPI_OPTIONS;
#define DPI_OPTION_SIZE (sizeof(dpi_array) / sizeof(uint16_t))

// TODO: Implement libinput profiles
// https://wayland.freedesktop.org/libinput/doc/latest/pointer-acceleration.html
// Compile time accel selection
// Valid options are ACC_NONE, ACC_LINEAR, ACC_CUSTOM, ACC_QUADRATIC

// Trackball State
bool     is_scroll_clicked = false;
bool     BurstState        = false;  // init burst state for Trackball module
uint16_t MotionStart       = 0;      // Timer for accel, 0 is resting state

void pointing_device_init_kb(void) {
    // set the DPI.
    pointing_device_set_cpi(dpi_array[keyboard_config.dpi_config]);
}

// Hardware Setup
void keyboard_pre_init_kb(void) {
    // debug_enable = true;
    // debug_matrix = true;
    // debug_mouse = true;
    // debug_encoder = true;

    /* Ground all output pins connected to ground. This provides additional
     * pathways to ground. If you're messing with this, know this: driving ANY
     * of these pins high will cause a short. On the MCU. Ka-blooey.
     */
#ifdef UNUSED_PINS
    const pin_t unused_pins[] = UNUSED_PINS;

    for (uint8_t i = 0; i < (sizeof(unused_pins) / sizeof(pin_t)); i++) {
        setPinOutput(unused_pins[i]);
        writePinLow(unused_pins[i]);
    }
#endif

    keyboard_pre_init_user();
}

void eeconfig_init_kb(void) {
    keyboard_config.dpi_config = PLOOPY_DPI_DEFAULT;
    eeconfig_update_kb(keyboard_config.raw);
    eeconfig_init_user();
}

void matrix_init_kb(void) {
    // is safe to just read DPI setting since matrix init
    // comes before pointing device init.
    keyboard_config.raw = eeconfig_read_kb();
    if (keyboard_config.dpi_config > DPI_OPTION_SIZE) {
        eeconfig_init_kb();
    }
    matrix_init_user();
}