Way to disable or slow MIDI CC data printing?

yannseznec

Hello!
I'm using my Bela with a USB midi device I've built. This means that when I run the patch with the Bela connected to the IDE the print window gets totally flooded with CC messages ("On port 0 (hw:1,0,0): type: control change, channel: 0, data1: 1, data2: 1, ").

This is generally not a problem, but when I'm bug fixing I often need to use the print window to see whether other things are happening correctly, but they get easily lost in the hundreds of CC messages that I don't really need to see.

Is there a way to disable or slow these messages?

lokki

yannseznec 'm using my Bela with a USB midi device I've built. This means that when I run the patch with the Bela connected to the IDE the print window gets totally flooded with CC messages ("On port 0 (hw:1,0,0): type: control change, channel: 0, data1: 1, data2: 1, ").

hi there, what is your diy controller? i suspect (correct me if i am wrong) that you are constantly sending midi messages even if you don't move your knobs etc. on the controller. it would be advisable to have some logic programmed in there that only sends midi messages when values actually change. this will stop the message flood, and it will also improve midi timing considerably.

pseudocode (arduino like):

currentValue = analogRead(POT_1);
currentValue = currentValue >> 4; //scale to midi 0-127, actual bitshift depends on your ADC resolution
if (currentValue != lastValue) sendMidi(currentValue);
lastValue = currentValue;

giuliomoro

Currently, the only possibility is to comment out the lines that are responsible for the printing in Bela/core/default_libpd_render.cpp :

--- a/core/default_libpd_render.cpp
+++ b/core/default_libpd_render.cpp
@@ -472,8 +472,8 @@ void render(BelaContext *context, void *userData)
                while((num = midi[port]->getParser()->numAvailableMessages()) > 0){
                        static MidiChannelMessage message;
                        message = midi[port]->getParser()->getNextChannelMessage();
-                       rt_printf("On port %d (%s): ", port, gMidiPortNames[port].c_str());
-                       message.prettyPrint(); // use this to print beautified message (channel, data bytes)
+                       //rt_printf("On port %d (%s): ", port, gMidiPortNames[port].c_str());
+                       //message.prettyPrint(); // use this to print beautified message (channel, data bytes)
                        switch(message.getType()){
                                case kmmNoteOn:
                                {

yannseznec

ok cool thanks! I might try that at some point.

yannseznec

lokki yup that did the trick! thanks a bunch. much cleaner now, no need to dig into the core libpd code.

for anyone else who runs into this, here's the code I used in the Arduino IDE:

  if (currentdateMidi1 != dateMidi1 || currentdateMidi2 != dateMidi2) {
usbMIDI.sendControlChange(dateMidi1, dateMidi2, 1);
  currentdateMidi1 = dateMidi1;
  currentdateMidi2 = dateMidi2;
  }

(it's a thing that sends a month number as the channel and the day number as the CC value, for various reasons!).

yannseznec

Oh yeah totally, I didn't think of that. That would help a lot, thanks! I'll adjust my code accordingly.