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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "encoder_input.hpp"
#include <sys/_stdint.h>
#include <memory>
#include "core/lv_group.h"
#include "esp_timer.h"
#include "gpios.hpp"
#include "hal/lv_hal_indev.h"
#include "nvs.hpp"
#include "relative_wheel.hpp"
#include "touchwheel.hpp"
constexpr int kDPadAngleThreshold = 20;
constexpr int kLongPressDelayMs = 500;
constexpr int kRepeatDelayMs = 250;
static inline auto IsAngleWithin(int16_t wheel_angle,
int16_t target_angle,
int threshold) -> bool {
int16_t difference = (wheel_angle - target_angle + 127 + 255) % 255 - 127;
return difference <= threshold && difference >= -threshold;
}
namespace ui {
static void encoder_read(lv_indev_drv_t* drv, lv_indev_data_t* data) {
EncoderInput* instance = reinterpret_cast<EncoderInput*>(drv->user_data);
instance->Read(data);
}
EncoderInput::EncoderInput(drivers::IGpios& gpios, drivers::TouchWheel& wheel)
: gpios_(gpios),
raw_wheel_(wheel),
relative_wheel_(std::make_unique<drivers::RelativeWheel>(wheel)),
scroller_(std::make_unique<Scroller>()),
mode_(drivers::NvsStorage::InputModes::kRotatingWheel),
is_locked_(false) {
lv_indev_drv_init(&driver_);
driver_.type = LV_INDEV_TYPE_ENCODER;
driver_.read_cb = encoder_read;
driver_.user_data = this;
registration_ = lv_indev_drv_register(&driver_);
}
auto EncoderInput::Read(lv_indev_data_t* data) -> void {
if (is_locked_) {
return;
}
raw_wheel_.Update();
relative_wheel_->Update();
// GPIOs updating is handled by system_fsm.
uint64_t now_ms = esp_timer_get_time() / 1000;
// Deal with the potential overflow of our timer.
for (auto& it : touch_time_ms_) {
if (it.second > now_ms) {
// esp_timer overflowed.
it.second = 0;
}
}
// Check each button.
HandleKey(Keys::kVolumeUp, now_ms, !gpios_.Get(drivers::IGpios::Pin::kKeyUp));
HandleKey(Keys::kVolumeDown, now_ms,
!gpios_.Get(drivers::IGpios::Pin::kKeyDown));
drivers::TouchWheelData wheel_data = raw_wheel_.GetTouchWheelData();
HandleKey(Keys::kTouchWheel, now_ms, wheel_data.is_wheel_touched);
HandleKey(Keys::kTouchWheelCenter, now_ms, wheel_data.is_button_touched);
HandleKey(
Keys::kDirectionalUp, now_ms,
wheel_data.is_wheel_touched &&
IsAngleWithin(wheel_data.wheel_position, 0, kDPadAngleThreshold));
HandleKey(
Keys::kDirectionalLeft, now_ms,
wheel_data.is_wheel_touched &&
IsAngleWithin(wheel_data.wheel_position, 63, kDPadAngleThreshold));
HandleKey(
Keys::kDirectionalDown, now_ms,
wheel_data.is_wheel_touched &&
IsAngleWithin(wheel_data.wheel_position, 127, kDPadAngleThreshold));
HandleKey(
Keys::kDirectionalRight, now_ms,
wheel_data.is_wheel_touched &&
IsAngleWithin(wheel_data.wheel_position, 189, kDPadAngleThreshold));
// We now have enough information to give LVGL its update.
switch (mode_) {
case drivers::NvsStorage::InputModes::kButtonsOnly:
data->state = LV_INDEV_STATE_RELEASED;
if (ShortPressTrigger(Keys::kVolumeUp)) {
data->enc_diff = -1;
} else if (ShortPressTrigger(Keys::kVolumeDown)) {
data->enc_diff = 1;
} else if (LongPressTrigger(Keys::kVolumeDown, now_ms)) {
data->state = LV_INDEV_STATE_PRESSED;
} else if (LongPressTrigger(Keys::kVolumeUp, now_ms)) {
// TODO: Back button event
}
break;
case drivers::NvsStorage::InputModes::kButtonsWithWheel:
data->state = ShortPressTrigger(Keys::kTouchWheel)
? LV_INDEV_STATE_PRESSED
: LV_INDEV_STATE_RELEASED;
if (ShortPressTriggerRepeating(Keys::kVolumeUp, now_ms)) {
data->enc_diff = scroller_->AddInput(now_ms, -1);
} else if (ShortPressTriggerRepeating(Keys::kVolumeDown, now_ms)) {
data->enc_diff = scroller_->AddInput(now_ms, 1);
}
if (!touch_time_ms_.contains(Keys::kVolumeDown) &&
!touch_time_ms_.contains(Keys::kVolumeUp)) {
data->enc_diff = scroller_->AddInput(now_ms, 0);
}
// TODO: Long-press events.
break;
case drivers::NvsStorage::InputModes::kDirectionalWheel:
data->state = ShortPressTrigger(Keys::kTouchWheelCenter)
? LV_INDEV_STATE_PRESSED
: LV_INDEV_STATE_RELEASED;
if (!ShortPressTriggerRepeating(Keys::kTouchWheel, now_ms)) {
break;
}
if (ShortPressTriggerRepeating(Keys::kDirectionalUp, now_ms)) {
data->enc_diff = scroller_->AddInput(now_ms, -1);
} else if (ShortPressTriggerRepeating(Keys::kDirectionalDown, now_ms)) {
data->enc_diff = scroller_->AddInput(now_ms, 1);
} else if (ShortPressTrigger(Keys::kDirectionalRight)) {
// TODO: ???
} else if (ShortPressTrigger(Keys::kDirectionalLeft)) {
// TODO: Back button event.
}
if (!touch_time_ms_.contains(Keys::kDirectionalUp) &&
!touch_time_ms_.contains(Keys::kDirectionalDown)) {
data->enc_diff = scroller_->AddInput(now_ms, 0);
}
// TODO: Long-press events.
break;
case drivers::NvsStorage::InputModes::kRotatingWheel:
if (!raw_wheel_.GetTouchWheelData().is_wheel_touched) {
data->enc_diff = scroller_->AddInput(now_ms, 0);
} else if (relative_wheel_->ticks() != 0) {
data->enc_diff = scroller_->AddInput(now_ms, relative_wheel_->ticks());
} else {
data->enc_diff = 0;
}
data->state = relative_wheel_->is_clicking() ? LV_INDEV_STATE_PRESSED
: LV_INDEV_STATE_RELEASED;
// TODO: Long-press events.
break;
}
// TODO: Apply inertia / acceleration.
}
auto EncoderInput::HandleKey(Keys key, uint64_t ms, bool clicked) -> void {
if (!clicked) {
touch_time_ms_.erase(key);
short_press_fired_.erase(key);
long_press_fired_.erase(key);
return;
}
if (!touch_time_ms_.contains(key)) {
touch_time_ms_[key] = ms;
}
}
auto EncoderInput::ShortPressTrigger(Keys key) -> bool {
if (touch_time_ms_.contains(key) && !short_press_fired_.contains(key)) {
short_press_fired_[key] = true;
return true;
}
return false;
}
auto EncoderInput::ShortPressTriggerRepeating(Keys key, uint64_t ms) -> bool {
if (touch_time_ms_.contains(key) &&
(!short_press_fired_.contains(key) ||
ms - touch_time_ms_[key] >= kRepeatDelayMs)) {
touch_time_ms_[key] = ms;
short_press_fired_[key] = true;
return true;
}
return false;
}
auto EncoderInput::LongPressTrigger(Keys key, uint64_t ms) -> bool {
if (touch_time_ms_.contains(key) && !long_press_fired_.contains(key) &&
ms - touch_time_ms_[key] >= kLongPressDelayMs) {
long_press_fired_[key] = true;
return true;
}
return false;
}
auto Scroller::AddInput(uint64_t ms, int direction) -> int {
bool dir_changed =
((velocity_ < 0 && direction > 0) || (velocity_ > 0 && direction < 0));
if (direction == 0 || dir_changed) {
last_input_ms_ = ms;
velocity_ = 0;
return 0;
}
// Decay with time
if (last_input_ms_ > ms) {
last_input_ms_ = 0;
}
uint diff = ms - last_input_ms_;
uint diff_steps = diff / 25;
last_input_ms_ = ms + (last_input_ms_ % 50);
// Use powers of two for our exponential decay so we can implement decay
// trivially via bit shifting.
velocity_ >>= diff_steps;
velocity_ += direction * 1000;
if (velocity_ > 0) {
return (velocity_ + 500) / 1000;
} else {
return (velocity_ - 500) / 1000;
}
}
} // namespace ui
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