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98 lines
2.3 KiB
98 lines
2.3 KiB
//
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// serialmididevice.cpp
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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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// Original author of this class:
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// R. Stange <rsta2@o2online.de>
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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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#include "serialmididevice.h"
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#include <assert.h>
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CSerialMIDIDevice::CSerialMIDIDevice (CMiniDexed *pSynthesizer, CInterruptSystem *pInterrupt,
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CConfig *pConfig)
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: CMIDIDevice (pSynthesizer, pConfig),
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m_pConfig (pConfig),
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m_Serial (pInterrupt, TRUE),
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m_nSerialState (0)
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{
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}
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CSerialMIDIDevice::~CSerialMIDIDevice (void)
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{
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m_nSerialState = 255;
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}
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boolean CSerialMIDIDevice::Initialize (void)
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{
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assert (m_pConfig);
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return m_Serial.Initialize (m_pConfig->GetMIDIBaudRate ());
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}
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void CSerialMIDIDevice::Process (void)
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{
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// Read serial MIDI data
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u8 Buffer[100];
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int nResult = m_Serial.Read (Buffer, sizeof Buffer);
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if (nResult <= 0)
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{
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return;
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}
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// Process MIDI messages
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// See: https://www.midi.org/specifications/item/table-1-summary-of-midi-message
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for (int i = 0; i < nResult; i++)
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{
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u8 uchData = Buffer[i];
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switch (m_nSerialState)
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{
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case 0:
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MIDIRestart:
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if ( (uchData & 0x80) == 0x80 // status byte, all channels
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&& (uchData & 0xF0) != 0xF0) // ignore system messages
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{
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m_SerialMessage[m_nSerialState++] = uchData;
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}
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break;
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case 1:
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case 2:
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if (uchData & 0x80) // got status when parameter expected
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{
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m_nSerialState = 0;
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goto MIDIRestart;
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}
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m_SerialMessage[m_nSerialState++] = uchData;
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if ( (m_SerialMessage[0] & 0xE0) == 0xC0
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|| m_nSerialState == 3) // message is complete
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{
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MIDIMessageHandler (m_SerialMessage, m_nSerialState);
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m_nSerialState = 0;
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}
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break;
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default:
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assert (0);
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break;
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}
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}
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}
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