for use in GameLab to translate joystick/button presses to keypresses via Arduino Leonardo

JoystickButton.ino

// Reads arduino digital pins and maps them to USB Joystick library
// NOTE: This sketch file is for use with Arduino Leonardo and Arduino Micro only.
// MODIFIED by Lee2sman 2016-11-18
// REQUIRES ArduinoJoystickLibrary by Matthew Heironimus
// Download at https://github.com/MHeironimus/ArduinoJoystickLibrary/tree/version-1.0
// This uses the Joystick (not Joystick2 or Joystick3) library. Unzip, drop it in your arduino / libraries folder
// Then flash to your Leonardo or Micro board. Use Enjoy2 (Mac) or Joy2Key (PC) to map it to button presses for a game.
// --------------------------------------------------------------------
  
#include <Joystick.h>

void setup() {

  // Initialize Button Pins
  pinMode(9, INPUT_PULLUP); // Button1 
  pinMode(10, INPUT_PULLUP); // Button2
  pinMode(11, INPUT_PULLUP); // Button3 

  pinMode(6, INPUT_PULLUP); // Button4 
  pinMode(7, INPUT_PULLUP); // Button5
  pinMode(8, INPUT_PULLUP); // Button6 

 //JOYSTICK
 pinMode(3, INPUT_PULLUP); //UP
 pinMode(5, INPUT_PULLUP); //LEFT
 pinMode(2, INPUT_PULLUP); // DOWN
 pinMode(4, INPUT_PULLUP); //RIGHT

  // Initialize Joystick Library
  Joystick.begin();
  Serial.begin(9600);
}

// Constant that maps the phyical pin to the joystick button.
const int pinToButtonMap =9;

// Last state of the button
int lastButtonState[13] = {0,0,0,0,0,0,0,0,0,0,0,0,0};

void loop() {

  // Read pin values
  for (int index = 0; index < 13; index++)
  {
    int currentButtonState = !digitalRead(index);
    if (currentButtonState != lastButtonState[index])
    {
      Serial.println("got one");
      Joystick.setButton(index, currentButtonState);
      lastButtonState[index] = currentButtonState;
    }
  }

  delay(50);
}