public void InitSerial(float portValue) {
   // initialize the serial port selected in the listBox
   println(
       "initializing serial "
           + PApplet.parseInt(portValue)
           + " in serial.list()"); // for debugging
   // grab the name of the serial port
   String portPos = Serial.list()[PApplet.parseInt(portValue)];
   // initialize the port
   serial = new Serial(this, portPos, 115200);
   // read bytes into a buffer until you get a linefeed (ASCII 10):
   serial.bufferUntil('\n');
   println("done init serial");
   // initialized com port flag
   init_com = 1;
 }
 public void InitComDropdown() {
   // Initialize portCommList
   int posX = 20;
   int posY = 70;
   PortsList = controlP5.addDropdownList("portComList", posX, posY, 100, 84);
   // Set the background color of the list (you wont see this though).
   PortsList.setBackgroundColor(color(200));
   // Set the height of each item when the list is opened.
   PortsList.setItemHeight(20);
   // Set the height of the bar itself.
   PortsList.setBarHeight(15);
   // Set the lable of the bar when nothing is selected.
   PortsList.captionLabel().set("Select COM port");
   // Set the top margin of the lable.
   PortsList.captionLabel().style().marginTop = 3;
   // Set the left margin of the lable.
   PortsList.captionLabel().style().marginLeft = 3;
   // Set the top margin of the value selected.
   PortsList.valueLabel().style().marginTop = 3;
   // Store the Serial ports in the string comList (char array).
   comList = serial.list();
   // We need to know how many ports there are, to know how many items to add to the list, so we
   // will convert it to a String object (part of a class).
   String comlist = join(comList, ",");
   // We also need how many characters there is in a single port name, we\u00b4ll store the chars
   // here for counting later.
   String COMlist = comList[0];
   // Here we count the length of each port name.
   int size2 = COMlist.length();
   // Now we can count how many ports there are, well that is count how many chars there are, so we
   // will divide by the amount of chars per port name.
   int size1 = comlist.length() / size2;
   // Now well add the ports to the list, we use a for loop for that. How many items is determined
   // by the value of size1.
   for (int i = 0; i < size1; i++) {
     // This is the line doing the actual adding of items, we use the current loop we are in to
     // determin what place in the char array to access and what item number to add it as.
     PortsList.addItem(comList[i], i);
   }
   // Set the color of the background of the items and the bar.
   PortsList.setColorBackground(color(60));
   // Set the color of the item your mouse is hovering over.
   PortsList.setColorActive(color(255, 128));
 }