107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
/*
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* Copyright (C) 2019 Max Regan
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#pragma once
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#include <functional>
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#include "Bsp/TaskScheduler.h"
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#include "Bsp/Task.h"
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#include "Bsp/ReturnCode.h"
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#include "Bsp/Drivers/GpioDriver.h"
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namespace BSP {
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class ButtonManager : public BSP::Schedule::Task {
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public:
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ButtonManager(BSP::Schedule::TaskScheduler &scheduler,
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GpioPin &btn_down,
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GpioPin &btn_mid,
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GpioPin &btn_up,
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BSP::time_t debounce_time)
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: m_scheduler(scheduler)
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, m_buttons
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{
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button_state(btn_down, debounce_time, ButtonManager::nop_callback),
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button_state(btn_mid, debounce_time, ButtonManager::nop_callback),
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button_state(btn_up, debounce_time, ButtonManager::nop_callback),
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}
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{
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m_instance = this;
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}
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ButtonManager() = delete;
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// TODO: Make a real singleton instead
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static ButtonManager *m_instance;
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enum Button {
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UP = 0,
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MID,
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DOWN,
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Count
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};
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enum class ButtonState {
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PRESSED,
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NOT_PRESSED
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};
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using ChangeCallback = std::function<void(ButtonState)>;
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BSP::Schedule::NextTime execute() override;
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BSP::ReturnCode init();
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void set_callback(Button btn, ChangeCallback callback);
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void remove_callback(Button btn);
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static void irq();
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private:
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struct button_state {
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button_state(GpioPin &pin,
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BSP::time_t debounce_time,
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ChangeCallback callback)
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: m_pin(pin)
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, m_debounce_time(debounce_time)
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, m_state(ButtonState::NOT_PRESSED)
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, m_state_change_ts(0)
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, m_callback(callback)
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{}
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GpioPin &m_pin;
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BSP::time_t const m_debounce_time;
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ButtonState m_prev_call_state; /*<! The last state the button was in when it the callback was called */
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ButtonState m_state; /*<! The state the button was in during the last iteration */
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BSP::time_t m_state_change_ts; /*<! The system time when the button entered its current state */
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ChangeCallback m_callback; /*<! The callback to call when the button has changed states (post-debounce) */
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};
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BSP::Schedule::TaskScheduler &m_scheduler;
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button_state m_buttons[Button::Count];
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static void nop_callback(ButtonState) {};
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};
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}
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