Radio Junk Box
/
KAMUI_USBHOST_MIDI-CV_Example
KAMUI USB HOST MIDI-CV Example based on Peter Barrett's BlueUSB
midi_parser.c
- Committer:
- radiojunkbox
- Date:
- 2012-05-11
- Revision:
- 0:3b4e3e2ec6a5
File content as of revision 0:3b4e3e2ec6a5:
//------------------------------------------------------------- // file : midi_parser.c // Copyright (C) 2012 RJB RadioJunkBox // Released under the MIT License: http://mbed.org/license/mit //------------------------------------------------------------- #include "mbed.h" #include "midi_parser.h" //------------------------------------------------------------- // MIDI Parser void MIDI_Parser(unsigned char mididata) { RxByte = mididata; if(MIDI_SystemMessage()) { MIDI_ChannelMessage(); } } //------------------------------------------------------------- // MIDI System Meassage int MIDI_SystemMessage(void) { if(SysEx){ if(RxByte == MIDI_EndSysEx){ SysEx = FALSE; } } else{ if(RxByte < 0xF8){ if(RxByte > 0x7F){ if(RxByte == MIDI_StartSysEx){ SysEx = TRUE; } else{ MidiCh = RxByte & 0x0F; } PC = 0; } else{ MByte[PC & 0x01] = RxByte; } return TRUE; } else { MIDI_SystemRealtimeMessage(); } } return FALSE; } //------------------------------------------------------------- // MIDI System Realtime Message void MIDI_SystemRealtimeMessage(void) { switch(RxByte) { case MIDI_TimingClock: gMIDISYNC_CLK |= 0x01; break; case MIDI_Start: gMIDISYNC_RUN = 0x01; break; case MIDI_Continue: gMIDISYNC_RUN = 0x01; break; case MIDI_Stop: gMIDISYNC_RUN = 0x00; break; case MIDI_ActiveSensing: break; case MIDI_SystemReset: break; } } //------------------------------------------------------------- // MIDI Channel Message void MIDI_ChannelMessage(void) { switch(PC){ case 0: switch(RxByte & 0xF0){ case MIDI_NoteOff: PC = 2; break; case MIDI_NoteOn: PC = 4; break; case MIDI_PolykeyPressure: PC = 6; break; case MIDI_ProgramChange: PC = 8; break; case MIDI_ControlChange: PC = 10; break; case MIDI_ChannelPressure: PC = 12; break; case MIDI_PitchBend: PC = 14; break; } break; // Note OFF case 2: PC = 3; break; case 3: PC = 2; NoteOFF(); break; // Note ON case 4: PC = 5; break; case 5: PC = 4; if( MByte[1] == 0){ NoteOFF(); } else{ NoteON(); } break; // Polyphonic Key Pressure case 6: PC = 7; break; case 7: PC = 6; break; // Program Change case 8: break; // Control Change case 10: PC = 11; break; case 11: switch(MByte[0]) { case MIDI_CC_Moduration: gModWheelBuf[MidiCh] = MByte[1] >> 2; break; case MIDI_CC_DataEntry: break; case MIDI_CC_RPN_LSB: break; case MIDI_CC_RPN_MSB: break; case MIDI_MM_AllSoundOff: break; case MIDI_MM_ResetAllControl: break; case MIDI_MM_AllNoteOff: break; } break; // Channel Pressure case 12: break; // Pitch Bend case 14: PC = 15; break; case 15: PC = 14; gPitchBendBuf[MidiCh] = (MByte[1] << 1) | (MByte[0] >> 6); break; default: break; } } //------------------------------------------------------------- // Note ON Message Processing void NoteON(void) { unsigned char i; unsigned char h = 0; // higheest note // ignore note if registed buffer for(i = 0; i < NoteCnt[MidiCh]; i++) { if(NoteBuf[MidiCh][i] == MByte[0]) { return; } } // full note buffer? if(NoteCnt[MidiCh] == MAX_NOTE_CNT) { for(i = 0; i < (MAX_NOTE_CNT - 1); i++) { NoteBuf[MidiCh][i] = NoteBuf[MidiCh][i+1]; } NoteBuf[MidiCh][MAX_NOTE_CNT - 1] = MByte[0]; } else { NoteBuf[MidiCh][NoteCnt[MidiCh]] = MByte[0]; NoteCnt[MidiCh]++; } // set highest note for(i = 0; i < NoteCnt[MidiCh]; i++) { if(h < NoteBuf[MidiCh][i]) { h = NoteBuf[MidiCh][i]; } } gPlayNoteBuf[MidiCh] = h; gGateBuf[MidiCh] = ON; } //------------------------------------------------------------- // Note OFF Message Processing void NoteOFF(void) { unsigned char i; unsigned char h = 0; // highest note int flg = FALSE; // Delete Note If Registed Buffer for(i = 0; i < NoteCnt[MidiCh]; i++) { if(flg) { NoteBuf[MidiCh][i-1] = NoteBuf[MidiCh][i]; } if(NoteBuf[MidiCh][i] == MByte[0]) { flg = TRUE; } } if(flg) NoteCnt[MidiCh]--; if(NoteCnt[MidiCh] == 0) { // Empty Buffer then Gate OFF gGateBuf[MidiCh] = OFF; } else { // Highest Note for(i = 0; i < NoteCnt[MidiCh]; i++) { if( h < NoteBuf[MidiCh][i]) { h = NoteBuf[MidiCh][i]; } } gPlayNoteBuf[MidiCh] = h; } }