mirror of
https://github.com/dwhinham/mt32-pi.git
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8d6b84fecc
This commit adds a simple physical control system with two schemes: * simple_buttons: 4-button scheme * simple_encoder: 2-button scheme + rotary encoder (with button)
96 lines
2.3 KiB
C++
96 lines
2.3 KiB
C++
//
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// control.h
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//
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// mt32-pi - A bare-metal Roland MT-32 emulator for Raspberry Pi
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// Copyright (C) 2020 Dale Whinham <daleyo@gmail.com>
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. 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 "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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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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u8 m_nButtonState;
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u8 m_nLastButtonState;
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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);
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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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