Trouble sending notes to PC

[drewm1980]

I am having trouble sending MIDI notes to the PC:

The device show up in lsusb I managed to Upload the following sketch:

void setup() {}

void loop() {
  while(MIDIUSB.available() > 0) {
            MIDIEvent e_on = {0x09, 0x90, 48, 64};
            MIDIEvent e_off = {0x08, 0x90, 48, 64};
           MIDIUSB.write(e_on);
            MIDIUSB.flush();
            delay(500);
            MIDIUSB.write(e_off);
            MIDIUSB.flush();
            delay(500);
   }
}

• The midi device shows up in "amidi -l" and also in the trial version of pianoteq
• Neither pianoteq or Wireshark are showing any traffic on the USB devices.

My configuration: Ubuntu 13.10

arcore: commit 2086a7ab4bb36fc2a56a8060a79f154b0e909bda Merge: 4ffdabc a6eeb1c Author: Ralf Kistner ralf@embarkmobile.com Date: Mon Jan 13 01:33:15 2014 -0800 Merge pull request #4 from stepto/master Added iPad compatibility via extra board type.

arduino-1.5.5 running as root Pianoteq STAGE Trial v4.5.4

Same behavior on an older Freeduino Leonardo, and also a brand new Arduino micro.

Thanks! I'm very excited to be so close to getting this working!

[rkistner]

I've only tested on an Arduino Leonardo myself, but another user reported it working on an Arduino Micro.

Have you tried with a loop like this yet? The loop in the example only sends a not back whenever it receives a note (I should add better examples, as another user also noted).

void loop() {
  while(true) {
        MIDIEvent e_on = {0x09, 0x90, 48, 64};
        MIDIEvent e_off = {0x08, 0x90, 48, 64};
        MIDIUSB.write(e_on);
        MIDIUSB.flush();
        delay(500);
        MIDIUSB.write(e_off);
        MIDIUSB.flush();
        delay(500);
   }
}

[drewm1980]

void setup() {}
void loop() {
            MIDIEvent e_on = {0x09, 0x90, 48, 64};
            MIDIEvent e_off = {0x08, 0x90, 48, 64};
            MIDIUSB.write(e_on);
            MIDIUSB.flush();
            delay(500);
            MIDIUSB.write(e_off);
            MIDIUSB.flush();
            delay(500);
}

Yay! Note ON works for the above example! I mistook the purpose of MIDIUSB.available() to be that the ~interface was available, not that a ~message was available. I think it might be less confusing if it was MIDIUSB.message_waiting() or something like that....

Note OFF isn't getting sent yet, but I probably just need to double-check the bytes in the message (maybe 0x8 isn't note off?)

[rkistner]

Great to know it's working. Try this for note on/off:

int channel = 0;
MIDIEvent e_on = {0x09, 0x90 | channel, 48, 64};
MIDIEvent e_off = {0x08, 0x80 | channel, 48, 64};

[drewm1980]

void setup() {}
void loop() {
    MIDIEvent e_on = {0x09, 0x90, 48, 64};
    MIDIEvent e_off = {0x08, 0x80, 48, 64};
    MIDIUSB.write(e_on);
    MIDIUSB.flush();
    delay(500);
    MIDIUSB.write(e_off);
    MIDIUSB.flush();
    delay(500);
}

Yep, that works! Thanks! The ORing wasn't necessary; it was that I had changed 0x90 to 0x80 thinking it was a channel input that should be the same for both notes.

I can confirm it's working with: Freeduino Leonardo Arduino Micro

[rkistner]

Thanks for the feedback. I expanded the examples in the readme now.