Check For USB Port Connection

[glv]

@glv

I did put the whole serial initialization in a startup() function that can be called from setup() or in draw()

Setup is intended to run once and will not update canvas as draw() does:

Processing Overview

setup() / Reference

Here is a minimal version to run “something” at start of draw() before looping though main code in draw() :

//boolean choiceMade = false;
boolean startup = true;
boolean displayOnce = true;

void setup()
  { 
  size(300, 150);
  textAlign(CENTER, CENTER);
  textSize(48);
  }
  
void draw()
  {
  //Startup code runs once until a key is pressed
  if (startup) 
    {
    background(255, 0, 0);
    
    if (keyPressed) 
      {
      //choiceMade = true;
      startup = false;
      }
    
    text("Press a key", width/2, height/2-10);
    return;      //https://processing.org/reference/return.html
    }
  
  //Main code
  background(0, 255, 0);
  text("Yay!", width/2, height/2-10);
  } 

’ ’

[fredstout]

I must wait until I return from Switzerland to try this out. Please bear with mr, I will be gone for a month,

Fred