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791f4a447a
This updated rotary encoder routine (borrowed from FlashFloppy by Kier Fraser) should provide much more reliable encoder tracking across a variety of encoder types, even when the encoder quality is poor or state transitions are quite noisy.
64 lines
1.6 KiB
C++
64 lines
1.6 KiB
C++
//
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// rotaryencoder.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 _rotaryencoder_h
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#define _rotaryencoder_h
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#include <circle/gpiopin.h>
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#include <circle/types.h>
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#include "utility.h"
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class CRotaryEncoder
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{
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public:
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#define ENUM_ENCODERTYPE(ENUM) \
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ENUM(Full, full) \
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ENUM(Half, half) \
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ENUM(Quarter, quarter)
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CONFIG_ENUM(TEncoderType, ENUM_ENCODERTYPE);
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CRotaryEncoder(TEncoderType Type, bool bReversed, unsigned GPIOPinCLK, unsigned GPIOPinDAT);
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s8 Read();
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void ReadGPIOPins();
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void ReadGPIOPins(bool bCLKValue, bool bDATValue);
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private:
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CGPIOPin m_CLKPin;
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CGPIOPin m_DATPin;
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TEncoderType m_Type;
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bool m_bReversed;
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s8 m_nDelta;
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u8 m_nState;
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// Bitmask of which valid 4-bit transition codes we have seen in each direction (CW and CCW)
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u16 nPreviousTransitions[2];
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unsigned int m_nLastReadTime;
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};
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#endif
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