mirror of
https://github.com/dwhinham/mt32-pi.git
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71fa6533af
Improve the button handling code so that a pressed and held button will now generate additional press events after a short delay. An acceleration curve is also applied so that events are generated with increasing frequency the longer the button is held down. Closes #323.
123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
//
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// control.h
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//
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// mt32-pi - A baremetal MIDI synthesizer for Raspberry Pi
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// Copyright (C) 2020-2023 Dale Whinham <daleyo@gmail.com>
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//
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// This file is part of mt32-pi.
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//
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// mt32-pi is free software: you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the Free Software
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// Foundation, either version 3 of the License, or (at your option) any later
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// version.
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//
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// mt32-pi is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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// details.
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//
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// You should have received a copy of the GNU General Public License along with
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// mt32-pi. If not, see <http://www.gnu.org/licenses/>.
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//
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#ifndef _control_h
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#define _control_h
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#include <circle/gpiopin.h>
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#include <circle/types.h>
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#include <circle/usertimer.h>
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#include "control/rotaryencoder.h"
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#include "event.h"
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#include "optional.h"
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#include "utility.h"
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class CControl
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{
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public:
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CControl(TEventQueue& pEventQueue);
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virtual ~CControl() = default;
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bool Initialize();
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virtual void Update();
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u8 GetButtonState() const { return m_nButtonState; }
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protected:
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// Called from interrupt context
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virtual void ReadGPIOPins() = 0;
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void DebounceButtonState(u8 nState, u8 nMask);
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// Must be power of two
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static constexpr size_t ButtonStateHistoryLength = 16;
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static constexpr size_t ButtonStateHistoryMask = ButtonStateHistoryLength - 1;
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static constexpr u32 RepeatDelayMicros = 500000; // 500ms
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static constexpr u32 RepeatAccelTimeMicros = 3000000; // 3s
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static constexpr u32 MaxRepeatPeriodMicros = 100000; // 10Hz
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static constexpr u32 MinRepeatPeriodMicros = 20000; // 50Hz
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TEventQueue* m_pEventQueue;
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CUserTimer m_Timer;
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// Debouncing
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u8 m_ButtonStateHistory[ButtonStateHistoryLength];
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size_t m_nButtonStateHistoryIndex;
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// State tracking
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u8 m_nButtonState;
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u8 m_nLastButtonState;
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// Repeat
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TOptional<u8> m_RepeatButton;
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u32 m_PressedTime;
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u32 m_RepeatTime;
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static inline u32 RepeatPeriod(u32 nPressedDuration)
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{
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return Utility::Lerp
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(
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nPressedDuration,
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0,
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RepeatAccelTimeMicros,
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MaxRepeatPeriodMicros,
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MinRepeatPeriodMicros
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);
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}
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static void InterruptHandler(CUserTimer* pUserTimer, void* pParam);
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};
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class CControlSimpleButtons : public CControl
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{
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public:
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CControlSimpleButtons(TEventQueue& pEventQueue);
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protected:
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virtual void ReadGPIOPins() override;
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CGPIOPin m_GPIOButton1;
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CGPIOPin m_GPIOButton2;
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CGPIOPin m_GPIOButton3;
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CGPIOPin m_GPIOButton4;
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};
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class CControlSimpleEncoder : public CControl
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{
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public:
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CControlSimpleEncoder(TEventQueue& pEventQueue, CRotaryEncoder::TEncoderType EncoderType, bool bEncoderReversed);
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virtual void Update() override;
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protected:
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virtual void ReadGPIOPins() override;
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CGPIOPin m_GPIOEncoderButton;
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CGPIOPin m_GPIOButton1;
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CGPIOPin m_GPIOButton2;
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CRotaryEncoder m_Encoder;
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};
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#endif
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