mirror of
https://github.com/felis/USB_Host_Shield_2.0.git
synced 2024-03-22 11:31:26 +01:00
93 lines
1.8 KiB
C++
Executable file
93 lines
1.8 KiB
C++
Executable file
/*
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*******************************************************************************
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* USB-MIDI to Legacy Serial MIDI converter
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* Copyright (C) 2012-2016 Yuuichi Akagawa
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*
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* Idea from LPK25 USB-MIDI to Serial MIDI converter
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* by Collin Cunningham - makezine.com, narbotic.com
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*
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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 <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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#include <SPI.h>
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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(unsigned long t1, unsigned long t2, unsigned long delayTime);
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void setup()
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{
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_MIDI_SERIAL_PORT.begin(31250);
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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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unsigned long t1;
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Usb.Task();
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t1 = 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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}
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//delay(1ms)
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doDelay(t1, 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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byte outBuf[ 3 ];
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uint8_t size;
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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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}
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// Delay time (max 16383 us)
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void doDelay(unsigned long t1, unsigned long t2, unsigned long delayTime)
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{
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unsigned long t3;
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if( t1 > t2 ){
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t3 = (4294967295 - 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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