[PD] Sending Startbit and Stopbit with comport for MIDI with Arduino

Hi,

I would like to send MIDI with [comport] from Pd by using an Arduino.

Reading into Pd is no problem. It also works fine as a MIDI Thru by simply forwarding the Serial1 RX input (MIDI input) to the Serial1 TX output (MIDI Thru). Something like this:

  if (Serial1.available() > 0) {
    Serial1.write(Serial1.read());
  }

(The loop duration is only about 250 µs so there is no timing problem in this case. For data coming in faster than the loop duration I would probably have to read into an arry first.)

However, if I'm sending a MIDI message from Pd it's not recognized by the connected MIDI interface. I'm assuming that's probably because there is no startbit and stopbit that the MIDI interface is looking for.

According to the helpfile I can send a stopbit with [comport] but I didn't find anything about a startbit.

Is there a possibility within Pd and [comport] to send a startbit or would it make more sense to add the startbit and stopbit within the Arduino programming?

Thanks! Ingo