Midi sendSysEx message unpredicable behaviour USB-MIDI library

[florisbouwstra]

Hello,

What a great place is this! I leaned a lot from this forum reading questions and answers. I learned a lot from that, thanks.

I am making a tally light system for a Roland V-8HD video mixer.
I use an Arduino Due with the native USB port for MIDI.
I have to send SysEx messages over USB to the Ronald V-8HD mixer and the video mixer sends a SysEx message back with in my case the tally light information.

I send always the same message but the sende messages are differing in length.

I read the send output in Hairless Midi 0.4
I post my code here.
I could not get the output as text from Hairless Midi, so I put is in as an attachment, sorry about that.

#include <USB-MIDI.h>

USBMIDI_CREATE_DEFAULT_INSTANCE();

unsigned long t0 = millis();
const byte SysExSendV8HdTally[] = {0xf0, 0x41, 0x10, 0x00, 0x00, 0x00, 0x68, 0x11, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x08, 0x6C, 0xF7};

void setup()
{  
  // Listen for MIDI messages on channel 1
  MIDI.begin(1);
  
}

void loop()
{
  // Listen to incoming Midi messages
  MIDI.read();

  // send SysExTally 10 times a second
  if ((millis() - t0) > 100)
  {
    t0 = millis();
    
    MIDI.sendSysEx(sizeof(SysExSendV8HdTally), SysExSendV8HdTally, true);
    
  }
}

Link to library page: GitHub - lathoub/Arduino-USBMIDI: Allows a microcontroller, with native USB capabilities, to appear as a MIDI device over USB to a connected computer

I hope you can help.

Greetings Floris

[PieterP]

Please post your code and links to the libraries you're using.

Pieter

[florisbouwstra]

#include <USB-MIDI.h>

USBMIDI_CREATE_DEFAULT_INSTANCE();

unsigned long t0 = millis();
const byte SysExSendV8HdTally[] = {0xf0, 0x41, 0x10, 0x00, 0x00, 0x00, 0x68, 0x11, 0x0C, 0x00, 0x00, 0x00, 0x00, 0x08, 0x6C, 0xF7};

void setup()
{  
  // Listen for MIDI messages on channel 1
  MIDI.begin(1);
  
}

void loop()
{
  // Listen to incoming Midi messages
  MIDI.read();

  // send SysExTally 10 times a second
  if ((millis() - t0) > 100)
  {
    t0 = millis();
    
    MIDI.sendSysEx(sizeof(SysExSendV8HdTally), SysExSendV8HdTally, true);
    
  }
}

lathoub/Arduino-USBMIDI

[PieterP]

This might be a Due specific problem. I'm unable to reproduce it on an Arduino Leonardo.

[florisbouwstra]

Thank you Pieter!

Do you have any suggestions where to look further?

Otherwise..., I need 16 pins out, so Leonardo could work for me...

Greetings, Floris

[PieterP]

Does this work?

#include <MIDIUSB.h>

unsigned long t0 = millis();

void setup() {}

void loop() {
  // Listen to incoming Midi messages
  (void) MidiUSB.read();

  // send SysExTally 10 times a second
  if ((millis() - t0) > 100)
  {
    t0 = millis();
   
    MidiUSB.sendMIDI({0x04, 0xF0, 0x41, 0x10});
    MidiUSB.sendMIDI({0x04, 0x00, 0x00, 0x00});
    MidiUSB.sendMIDI({0x04, 0x68, 0x11, 0x0C});
    MidiUSB.sendMIDI({0x04, 0x00, 0x00, 0x00});
    MidiUSB.sendMIDI({0x04, 0x00, 0x08, 0x6C});
    MidiUSB.sendMIDI({0x05, 0xF7, 0x00, 0x00});
    MidiUSB.flush();
  }
}

[florisbouwstra]

No, still strange lengths (and timing), see image in attachment.

[PieterP]

Then it might be an issue with the MIDIUSB library. I don't own a Due, so I'm afraid I can't help you any further.

Just to be sure, it might be useful to try a different MIDI monitor or a different computer. There are online MIDI monitors like Loading....

[florisbouwstra]

Sending and receiving SysEx massages with the code on an Arduino Leonardo works fine! Sending and receiving Tally inforation with Midi SysEx messages from Ronald V-8HD, routed via MidiFire on iPad, is working.

[davidradio]

Hello, I was very interested to see your post as I also want to add Tally lights to my Roland V-8HD. Unfortunately I understand electronics and circuits but I am a beginner in software so do you have any advice for me or do you mind sharing your project? I have an Arduino Leonardo as I note that is how you made your project work.
Thank you very much!
David

[florisbouwstra]

Hello David, great that you are interested! I use the Tally system in our webinar studio. I am not experienced in writing code so it can be improved but it is working. I am routing USB Midi communication via an iPad acting as a USB host. The only problem nog solved is using the Arduin Tally system in combination with the V-8HD Remote app. Then USB trafic seems to interfere with each other creating USB Midi traffic to stall. With the V-8HD Remote app running in the background the Arduino Tally system for Ronald V-8HD runs flawwless.

Here is the code:

[florisbouwstra]

Link to code for Tally system for Ronald V-8HD based on Arduino Leonardo.

https://create.arduino.cc/editor/florisbouwstra/c098c304-8b63-4d67-86e3-62dbe54daf37/preview