How to forward midi-RealTime messages

Using Arduino Programming Questions
1

Ok so since i have some new parts in my studio i modified my midi keyboard to have an extra Midi output port and created a dual-merger to create an extra input port. It all worked using the simplest of sketches

#include <MIDI.h>

#include <SoftwareSerial.h>
SoftwareSerial softSerial(2, 3);
MIDI_CREATE_INSTANCE(HardwareSerial, Serial,     midiA);
MIDI_CREATE_INSTANCE(SoftwareSerial, softSerial, midiB);

void setup() {
  pinMode(LED_BUILTIN, OUTPUT);
  midiA.begin(MIDI_CHANNEL_OMNI);
  midiB.begin(MIDI_CHANNEL_OMNI);
  midiB.turnThruOff();
  midiA.turnThruOff();
}

void loop() {
  static uint32_t lastmsg = millis();
  if (midiB.read())  {
    
    midiA.send(midiB.getType(), midiB.getData1(), midiB.getData2(), midiB.getChannel());
    lastmsg = millis();
  }
  if (midiA.read())  {
    midiA.send(midiA.getType(), midiA.getData1(), midiA.getData2(), midiA.getChannel());
    lastmsg = millis();
    }    
  }
  if (millis() - lastmsg < 1000) digitalWrite(LED_BUILTIN, HIGH);
  else digitalWrite(LED_BUILTIN, LOW);
}

But now i am working on getting my midi-pedal board connected and one of it's features should be sending midi-clock messages. I had a snippet somewhere that does that for me, and it works straight into my soundcard's midi input. But through the merger it doesn't. Then i remembered that for sending realtime messages you need to use

midiA.sendRealTime(midi::Clock);

and so i ended up doing this

if (midiB.read())  {
    if (midiB.getType() == midi::Clock) { 
      midiA.sendRealTime(midi::Clock);
    }
    else if (midiB.getType() == midi::Start) { 
      midiA.sendRealTime(midi::Start);
    }
    else if (midiB.getType() == midi::Stop) {  
      midiA.sendRealTime(midi::Stop);
    }
    else if (midiB.getType() == midi::Continue) {  
      midiA.sendRealTime(midi::Continue);
    }
    else {
      midiA.send(midiB.getType(), midiB.getData1(), midiB.getData2(), midiB.getChannel());
      lastmsg = millis();
    }    
  }

and that works, but is not very elegant.
so i looked at the midi namespace and the HEX values for the realtime messages are

    Clock                 = 0xF8,    ///< System Real Time - Timing Clock
    Start                 = 0xFA,    ///< System Real Time - Start
    Continue              = 0xFB,    ///< System Real Time - Continue
    Stop                  = 0xFC,    ///< System Real Time - Stop
    ActiveSensing         = 0xFE,    ///< System Real Time - Active Sensing
    SystemReset           = 0xFF,    ///< System Real Time - System Reset

So i figured that

if (midiB.getType() & 0xF8 == 0xF8) { 
      midiA.sendRealTime(midiB.getType());

should also work, but that somehow doesn't. Anybody have any idea ?

2

Really nobody ? Always disappointing.

3

Add parentheses around midiB.getType() & 0xF8:
https://en.cppreference.com/w/cpp/language/operator_precedence

1 Like
4

Good catch! I never remember that '==' has higher precedence than the bitwise operators.

5

Neither did i ! i add parentheses in lots of places where i don't even need them, but i never thought of that.
Ok time to take the midi keyboard apart again to verify.

6

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