181 lines
5.1 KiB
C++
181 lines
5.1 KiB
C++
/*!
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* @file midi_UsbTransport.hpp
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* Project Arduino MIDI Library
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* @brief MIDI Library for the Arduino - Transport layer for USB MIDI
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* @author Francois Best
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* @date 10/10/2016
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* @license MIT - Copyright (c) 2016 Francois Best
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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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*
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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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BEGIN_MIDI_NAMESPACE
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template<unsigned BufferSize>
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inline UsbTransport<BufferSize>::UsbTransport()
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{
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}
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template<unsigned BufferSize>
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inline UsbTransport<BufferSize>::~UsbTransport()
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{
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}
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// -----------------------------------------------------------------------------
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template<unsigned BufferSize>
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inline void UsbTransport<BufferSize>::begin(unsigned inBaudrate)
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{
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mTxBuffer.clear();
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mRxBuffer.clear();
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}
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template<unsigned BufferSize>
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inline unsigned UsbTransport<BufferSize>::available()
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{
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pollUsbMidi();
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return mRxBuffer.getLength();
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}
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template<unsigned BufferSize>
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inline byte UsbTransport<BufferSize>::read()
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{
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return mRxBuffer.read();
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}
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template<unsigned BufferSize>
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inline void UsbTransport<BufferSize>::write(byte inData)
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{
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mTxBuffer.write(inData);
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recomposeAndSendTxPackets();
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}
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// -----------------------------------------------------------------------------
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template<unsigned BufferSize>
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inline bool UsbTransport<BufferSize>::pollUsbMidi()
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{
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bool received = false;
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midiEventPacket_t packet = MidiUSB.read();
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while (packet.header != 0)
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{
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received = true;
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switch (packet.header << 4)
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{
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// 3 bytes messages
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case midi::NoteOff:
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case midi::NoteOn:
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case midi::AfterTouchPoly:
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case midi::ControlChange:
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case midi::PitchBend:
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mRxBuffer.write(packet.byte1);
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mRxBuffer.write(packet.byte2);
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mRxBuffer.write(packet.byte3);
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break;
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// 2 bytes messages
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case midi::ProgramChange:
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case midi::AfterTouchChannel:
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mRxBuffer.write(packet.byte1);
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mRxBuffer.write(packet.byte2);
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break;
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// 1 byte message
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case midi::TuneRequest:
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case midi::Clock:
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case midi::Start:
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case midi::Continue:
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case midi::Stop:
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case midi::ActiveSensing:
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case midi::SystemReset:
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mRxBuffer.write(packet.byte1);
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break;
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// Special cases
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// case midi::SystemExclusive:
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// case midi::TimeCodeQuarterFrame:
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// case midi::SongPosition:
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// case midi::SongSelect:
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// break;
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default:
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break;
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}
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packet = MidiUSB.read();
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}
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return received;
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}
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template<unsigned BufferSize>
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inline void UsbTransport<BufferSize>::recomposeAndSendTxPackets()
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{
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while (!mTxBuffer.isEmpty())
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{
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const byte data = mTxBuffer.read();
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if (mCurrentTxPacketByteIndex == 0)
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{
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mCurrentTxPacket.mPacket.header = encodePacketHeader(data);
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}
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else
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{
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mCurrentTxPacket.mDataArray[mCurrentTxPacketByteIndex] = data;
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}
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mCurrentTxPacketByteIndex++;
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const int packetLength = getPacketLength(mCurrentTxPacket.mPacket);
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if (mCurrentTxPacketByteIndex == packetLength)
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{
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MidiUSB.write(mCurrentTxPacket.mDataArray, packetLength);
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resetTx();
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}
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}
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}
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template<unsigned BufferSize>
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inline void UsbTransport<BufferSize>::resetTx()
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{
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mCurrentTxPacket.mPacket.header = 0;
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mCurrentTxPacket.mPacket.byte1 = 0;
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mCurrentTxPacket.mPacket.byte2 = 0;
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mCurrentTxPacket.mPacket.byte3 = 0;
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mCurrentTxPacketByteIndex = 0;
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}
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template<unsigned BufferSize>
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inline byte UsbTransport<BufferSize>::encodePacketHeader(StatusByte inStatusByte)
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{
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// todo: fix me for other types than channel
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return inStatusByte >> 4;
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}
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template<unsigned BufferSize>
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inline int UsbTransport<BufferSize>::getPacketLength(const midiEventPacket_t& inPacket)
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{
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return 3;
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}
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END_MIDI_NAMESPACE
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