Add MIDI Interface_16x16 example

examples/MIDI/Interface_16x16/Interface_16x16.ino

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+/* Create a "class compliant " USB to 6 MIDI IN and 6 MIDI OUT interface,
+   plus 10 more USB connected devices.  Admittedly, you could just plug
+   those 10 devices directly into your computer, but this example is meant
+   to show how to forward any MIDI message between the 3 different MIDI
+   libraries.  A "real" application might do something more interesting,
+   like translate or modify the MIDI messages....
+
+   MIDI receive (6N138 optocoupler) input circuit and series resistor
+   outputs need to be connected to Serial1-Serial6.  A USB host cable
+   is needed on Teensy 3.6's second USB port, and obviously USB hubs
+   are needed to connect up to 10 USB MIDI devices.  That's a *LOT* of
+   extra hardware to connect to a Teensy!
+
+   You must select MIDIx16 from the "Tools > USB Type" menu
+
+   This example code is in the public domain.
+*/
+
+#include <MIDI.h>        // access to serial (5 pin DIN) MIDI
+#include <USBHost_t36.h> // access to USB MIDI devices (plugged into 2nd USB port)
+
+// Create the Serial MIDI ports
+MIDI_CREATE_INSTANCE(HardwareSerial, Serial1, MIDI1);
+MIDI_CREATE_INSTANCE(HardwareSerial, Serial2, MIDI2);
+MIDI_CREATE_INSTANCE(HardwareSerial, Serial3, MIDI3);
+MIDI_CREATE_INSTANCE(HardwareSerial, Serial4, MIDI4);
+MIDI_CREATE_INSTANCE(HardwareSerial, Serial5, MIDI5);
+MIDI_CREATE_INSTANCE(HardwareSerial, Serial6, MIDI6);
+//midi::MidiInterface &SerialMidiList[6] = {MIDI1, MIDI2, MIDI3, MIDI4, MIDI5, MIDI6};
+
+// Create the ports for USB devices plugged into Teensy's 2nd USB port (via hubs)
+USBHost myusb;
+USBHub hub1(myusb);
+USBHub hub2(myusb);
+USBHub hub3(myusb);
+USBHub hub4(myusb);
+MIDIDevice midi01(myusb);
+MIDIDevice midi02(myusb);
+MIDIDevice midi03(myusb);
+MIDIDevice midi04(myusb);
+MIDIDevice midi05(myusb);
+MIDIDevice midi06(myusb);
+MIDIDevice midi07(myusb);
+MIDIDevice midi08(myusb);
+MIDIDevice midi09(myusb);
+MIDIDevice midi10(myusb);
+MIDIDevice * midilist[10] = {
+  &midi01, &midi02, &midi03, &midi04, &midi05, &midi06, &midi07, &midi08, &midi09, &midi10
+};
+
+// A variable to know how long the LED has been turned on
+elapsedMillis ledOnMillis;
+
+
+void setup() {
+  Serial.begin(115200);
+  pinMode(13, OUTPUT); // LED pin
+  digitalWrite(13, LOW);
+  MIDI1.begin(MIDI_CHANNEL_OMNI);
+  MIDI2.begin(MIDI_CHANNEL_OMNI);
+  MIDI3.begin(MIDI_CHANNEL_OMNI);
+  MIDI4.begin(MIDI_CHANNEL_OMNI);
+  MIDI5.begin(MIDI_CHANNEL_OMNI);
+  MIDI6.begin(MIDI_CHANNEL_OMNI);
+  // Wait 1.5 seconds before turning on USB Host.  If connected USB devices
+  // use too much power, Teensy at least completes USB enumeration, which
+  // makes isolating the power issue easier.
+  delay(1500);
+  Serial.println("Interface_16x16 Example");
+  delay(10);
+  myusb.begin();
+}
+
+
+void loop() {
+  bool activity = false;
+
+  // First read messages from the 6 Serial MIDI IN ports
+  if (MIDI1.read()) {
+    sendToComputer(MIDI1.getType(), MIDI1.getData1(), MIDI1.getData2(), MIDI1.getChannel(), MIDI1.getSysExArray(), 0);
+    activity = true;
+  }
+  if (MIDI2.read()) {
+    sendToComputer(MIDI2.getType(), MIDI2.getData1(), MIDI2.getData2(), MIDI2.getChannel(), MIDI2.getSysExArray(), 1);
+    activity = true;
+  }
+  if (MIDI3.read()) {
+    sendToComputer(MIDI3.getType(), MIDI3.getData1(), MIDI3.getData2(), MIDI3.getChannel(), MIDI3.getSysExArray(), 2);
+    activity = true;
+  }
+  if (MIDI4.read()) {
+    sendToComputer(MIDI4.getType(), MIDI4.getData1(), MIDI4.getData2(), MIDI4.getChannel(), MIDI4.getSysExArray(), 3);
+    activity = true;
+  }
+  if (MIDI5.read()) {
+    sendToComputer(MIDI5.getType(), MIDI5.getData1(), MIDI5.getData2(), MIDI5.getChannel(), MIDI5.getSysExArray(), 4);
+    activity = true;
+  }
+  if (MIDI6.read()) {
+    sendToComputer(MIDI6.getType(), MIDI6.getData1(), MIDI6.getData2(), MIDI6.getChannel(), MIDI6.getSysExArray(), 5);
+    activity = true;
+  }
+
+  // Next read messages arriving from the (up to) 10 USB devices plugged into the USB Host port
+  for (int port=0; port < 10; port++) {
+    if (midilist[port]->read()) {
+      uint8_t type =       midilist[port]->getType();
+      uint8_t data1 =      midilist[port]->getData1();
+      uint8_t data2 =      midilist[port]->getData2();
+      uint8_t channel =    midilist[port]->getChannel();
+      const uint8_t *sys = midilist[port]->getSysExArray();
+      sendToComputer(type, data1, data2, channel, sys, 6 + port);
+    }
+  }
+
+  // Finally, read any messages the PC sends to Teensy, and forward them
+  // to either Serial MIDI or to USB devices on the USB host port.
+  if (usbMIDI.read()) {
+    // get the USB MIDI message, defined by these 5 numbers (except SysEX)
+    byte type = usbMIDI.getType();
+    byte channel = usbMIDI.getChannel();
+    byte data1 = usbMIDI.getData1();
+    byte data2 = usbMIDI.getData2();
+    byte cable = usbMIDI.getCable();
+
+    // forward this message to 1 of the 3 Serial MIDI OUT ports
+    if (type != usbMIDI.SystemExclusive) {
+      // Normal messages, first we must convert usbMIDI's type (an ordinary
+      // byte) to the MIDI library's special MidiType.
+      midi::MidiType mtype = (midi::MidiType)type;
+
+      // Then simply give the data to the MIDI library send()
+      switch (cable) {
+        case  0: MIDI1.send(mtype, data1, data2, channel); break;
+        case  1: MIDI2.send(mtype, data1, data2, channel); break;
+        case  2: MIDI3.send(mtype, data1, data2, channel); break;
+        case  3: MIDI4.send(mtype, data1, data2, channel); break;
+        case  4: MIDI5.send(mtype, data1, data2, channel); break;
+        case  5: MIDI6.send(mtype, data1, data2, channel); break;
+        default: // cases 6-15
+          midilist[cable - 6]->send(type, data1, data2, channel);
+      }
+
+    } else {
+      // SysEx messages are special.  The message length is given in data1 & data2
+      unsigned int SysExLength = data1 + data2 * 256;
+      switch (cable) {
+        case 0: MIDI1.sendSysEx(SysExLength, usbMIDI.getSysExArray(), true); break;
+        case 1: MIDI2.sendSysEx(SysExLength, usbMIDI.getSysExArray(), true); break;
+        case 2: MIDI3.sendSysEx(SysExLength, usbMIDI.getSysExArray(), true); break;
+        case 3: MIDI4.sendSysEx(SysExLength, usbMIDI.getSysExArray(), true); break;
+        case 4: MIDI5.sendSysEx(SysExLength, usbMIDI.getSysExArray(), true); break;
+        case 5: MIDI6.sendSysEx(SysExLength, usbMIDI.getSysExArray(), true); break;
+        default: // cases 6-15
+          midilist[cable - 6]->sendSysEx(SysExLength, usbMIDI.getSysExArray(), true);
+      }
+    }
+    activity = true;
+  }
+
+  // blink the LED when any activity has happened
+  if (activity) {
+    digitalWriteFast(13, HIGH); // LED on
+    ledOnMillis = 0;
+  }
+  if (ledOnMillis > 15) {
+    digitalWriteFast(13, LOW);  // LED off
+  }
+
+}
+
+
+void sendToComputer(byte type, byte data1, byte data2, byte channel, const uint8_t *sysexarray, byte cable)
+{
+  if (type != midi::SystemExclusive) {
+    usbMIDI.send(type, data1, data2, channel, cable);
+  } else {
+    unsigned int SysExLength = data1 + data2 * 256;
+    usbMIDI.sendSysEx(SysExLength, sysexarray, true, cable);
+  }
+}