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