160 lines
3.5 KiB
C++
160 lines
3.5 KiB
C++
/*
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*******************************************************************************
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* Legacy Serial MIDI and USB Host bidirectional converter
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* Copyright (C) 2013-2017 Yuuichi Akagawa
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*
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* for use with Arduino MIDI library
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* https://github.com/FortySevenEffects/arduino_midi_library/
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*
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* Note:
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* - If you want use with Leonardo, you must choose Arduino MIDI library v4.0 or higher.
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* - This is sample program. Do not expect perfect behavior.
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*******************************************************************************
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*/
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#include <MIDI.h>
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#include <usbh_midi.h>
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#include <usbhub.h>
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// Satisfy the IDE, which needs to see the include statment in the ino too.
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#ifdef dobogusinclude
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#include <spi4teensy3.h>
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#endif
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#include <SPI.h>
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//Arduino MIDI library v4.2 compatibility
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#ifdef MIDI_CREATE_DEFAULT_INSTANCE
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MIDI_CREATE_DEFAULT_INSTANCE();
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#endif
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#ifdef USBCON
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#define _MIDI_SERIAL_PORT Serial1
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#else
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#define _MIDI_SERIAL_PORT Serial
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#endif
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//////////////////////////
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// MIDI Pin assign
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// 2 : GND
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// 4 : +5V(Vcc) with 220ohm
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// 5 : TX
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//////////////////////////
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USB Usb;
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USBH_MIDI Midi(&Usb);
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void MIDI_poll();
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void doDelay(uint32_t t1, uint32_t t2, uint32_t delayTime);
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//If you want handle System Exclusive message, enable this #define otherwise comment out it.
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#define USBH_MIDI_SYSEX_ENABLE
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#ifdef USBH_MIDI_SYSEX_ENABLE
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//SysEx:
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void handle_sysex( byte* sysexmsg, unsigned sizeofsysex) {
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Midi.SendSysEx(sysexmsg, sizeofsysex);
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}
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#endif
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void setup()
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{
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MIDI.begin(MIDI_CHANNEL_OMNI);
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#ifdef USBH_MIDI_SYSEX_ENABLE
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MIDI.setHandleSystemExclusive(handle_sysex);
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#endif
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if (Usb.Init() == -1) {
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while (1); //halt
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}//if (Usb.Init() == -1...
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delay( 200 );
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}
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void loop()
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{
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uint8_t msg[4];
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Usb.Task();
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uint32_t t1 = (uint32_t)micros();
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if ( Usb.getUsbTaskState() == USB_STATE_RUNNING )
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{
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MIDI_poll();
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if (MIDI.read()) {
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msg[0] = MIDI.getType();
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switch (msg[0]) {
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case midi::ActiveSensing :
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break;
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case midi::SystemExclusive :
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//SysEx is handled by event.
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break;
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default :
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msg[1] = MIDI.getData1();
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msg[2] = MIDI.getData2();
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Midi.SendData(msg, 0);
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break;
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}
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}
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}
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//delay(1ms)
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doDelay(t1, (uint32_t)micros(), 1000);
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}
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// Poll USB MIDI Controler and send to serial MIDI
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void MIDI_poll()
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{
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uint8_t size;
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#ifdef USBH_MIDI_SYSEX_ENABLE
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uint8_t recvBuf[MIDI_EVENT_PACKET_SIZE];
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uint8_t rcode = 0; //return code
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uint16_t rcvd;
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uint8_t readPtr = 0;
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rcode = Midi.RecvData( &rcvd, recvBuf);
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//data check
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if (rcode != 0) return;
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if ( recvBuf[0] == 0 && recvBuf[1] == 0 && recvBuf[2] == 0 && recvBuf[3] == 0 ) {
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return ;
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}
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uint8_t *p = recvBuf;
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while (readPtr < MIDI_EVENT_PACKET_SIZE) {
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if (*p == 0 && *(p + 1) == 0) break; //data end
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uint8_t outbuf[3];
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uint8_t rc = Midi.extractSysExData(p, outbuf);
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if ( rc == 0 ) {
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p++;
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size = Midi.lookupMsgSize(*p);
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_MIDI_SERIAL_PORT.write(p, size);
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p += 3;
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} else {
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_MIDI_SERIAL_PORT.write(outbuf, rc);
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p += 4;
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}
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readPtr += 4;
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}
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#else
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uint8_t outBuf[3];
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do {
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if ( (size = Midi.RecvData(outBuf)) > 0 ) {
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//MIDI Output
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_MIDI_SERIAL_PORT.write(outBuf, size);
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}
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} while (size > 0);
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#endif
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}
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// Delay time (max 16383 us)
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void doDelay(uint32_t t1, uint32_t t2, uint32_t delayTime)
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{
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uint32_t t3;
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if ( t1 > t2 ) {
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t3 = (0xFFFFFFFF - t1 + t2);
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} else {
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t3 = t2 - t1;
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}
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if ( t3 < delayTime ) {
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delayMicroseconds(delayTime - t3);
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}
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}
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