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55 lines
1.6 KiB
55 lines
1.6 KiB
2 years ago
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//
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// midipin.h
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//
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// MiniDexed - Dexed FM synthesizer for bare metal Raspberry Pi
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// Copyright (C) 2022 The MiniDexed Team
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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 _midipin_h
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#define _midipin_h
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#include <circle/gpiopin.h>
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#include <circle/types.h>
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// MIDI CC numbers go 0 to 127.
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// Normal GPIO pins are below 100.
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// So use a "pin number" of 128 + MIDI CC message for a "MIDI Pin"
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#define MIDI_PINS 128
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#define ccToMidiPin(c) ((c)+MIDI_PINS)
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#define MidiPinToCC(p) ((p)-MIDI_PINS)
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#define isMidiPin(p) (((p)>=MIDI_PINS)?1:0)
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class CMIDIPin
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{
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public:
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CMIDIPin (unsigned nPinNumber); // pinNumber = ccToMidiPin (MIDI CC number)
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~CMIDIPin (void);
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// Will return MP_HIGH or MP_LOW.
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// Should be treated as a PULLED UP IO pin
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// i.e. treated as "active low" (LOW) when pressed.
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unsigned Read (void);
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// MIDI CC values >=64 will set the MIDI pin to LOW ("on")
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// MIDI CC values <= 63 will set the MIDI pin to HIGH ("off")
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void Write (unsigned nValue);
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private:
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unsigned m_nPinNumber;
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unsigned m_nValue;
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};
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#endif
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