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82 lines
1.8 KiB
82 lines
1.8 KiB
1 year ago
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/*
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* Copyright 2024 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#include "input_touch_wheel.hpp"
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#include <stdint.h>
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#include <cstdint>
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#include "hal/lv_hal_indev.h"
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#include "haptics.hpp"
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#include "input_device.hpp"
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#include "touchwheel.hpp"
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namespace input {
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TouchWheel::TouchWheel(drivers::TouchWheel& wheel)
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: wheel_(wheel),
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is_scrolling_(false),
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sensitivity_(128),
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threshold_(10),
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is_first_read_(true),
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last_angle_(0) {}
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auto TouchWheel::read(lv_indev_data_t* data) -> void {
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wheel_.Update();
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auto wheel_data = wheel_.GetTouchWheelData();
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int8_t ticks = calculate_ticks(wheel_data);
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if (!wheel_data.is_wheel_touched) {
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// User has released the wheel.
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is_scrolling_ = false;
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data->enc_diff = 0;
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} else if (ticks != 0) {
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// User is touching the wheel, and has just passed the sensitivity
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// threshold for a scroll tick.
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is_scrolling_ = true;
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data->enc_diff = ticks;
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} else {
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// User is touching the wheel, but hasn't moved.
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data->enc_diff = 0;
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}
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if (!is_scrolling_ && wheel_data.is_button_touched) {
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data->state = LV_INDEV_STATE_PRESSED;
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} else {
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data->state = LV_INDEV_STATE_RELEASED;
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}
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}
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auto TouchWheel::calculate_ticks(const drivers::TouchWheelData& data)
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-> int8_t {
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if (!data.is_wheel_touched) {
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is_first_read_ = true;
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return 0;
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}
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uint8_t new_angle = data.wheel_position;
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if (is_first_read_) {
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is_first_read_ = false;
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last_angle_ = new_angle;
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return 0;
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}
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int delta = 128 - last_angle_;
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uint8_t rotated_angle = new_angle + delta;
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if (rotated_angle < 128 - threshold_) {
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last_angle_ = new_angle;
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return 1;
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} else if (rotated_angle > 128 + threshold_) {
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last_angle_ = new_angle;
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return -1;
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} else {
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return 0;
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}
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}
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} // namespace input
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