/*
 * Space Invaders TV Game Joystick test sketch
 * Chris Mahoney / March 17, 2013
 *
 * Use keyboard emulation of Leonardo to press keyboard
 * keys when switches are triggered on Space Invaders controller.
 */
 
//Variables for the buttons
/* 
 * Switch order:
 * (8) Ground, L, U, R, D, B, A (2)
 */
// Arduino pin -> function
int buttonLeft=7, buttonUp=6, buttonRight=5, buttonDown=4, buttonB=3, buttonA=2;
// Set all pins high before setup()
int prevLeft = HIGH, prevUp = HIGH, prevRight = HIGH, prevDown = HIGH, prevB = HIGH, prevA = HIGH;
 
// Array of button pins
int buttons[6] = {buttonLeft, buttonUp, buttonRight, buttonDown, buttonB, buttonA};
// Previous state of buttons
int prevButtons[6] = {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH};
// Actual ASCII values to "press"
int buttonNames[6] = {KEY_LEFT_ARROW, KEY_UP_ARROW, KEY_RIGHT_ARROW, KEY_DOWN_ARROW, 122 /* Z */, 120 /* X */};
int pinCount = 6; // # of pins
 
void setup(void)
{
  // Set all pins INPUT to begin
  for (int pin = 0; pin < pinCount; pin++) {
    pinMode(pin, INPUT); 
  }
  // Enable keyboard interaction (REQUIRES LEONARDO/MICRO)
  Keyboard.begin();
}
void loop(void)
{
  // Run each pin each loop
  for (int pin = 0; pin < pinCount; pin++) {
    // Get pin value
    int buttonState = digitalRead(buttons[pin]);
    // Only process if different than last check
    if (buttonState != prevButtons[pin]) { // State change, process it
 
      // Pressed?
      if (buttonState == HIGH) {
        Keyboard.press(buttonNames[pin]);   
      } 
      // Released?
      if (buttonState == LOW) {
        Keyboard.release(buttonNames[pin]);
      }
 
      // Set new previous state
      prevButtons[pin] = buttonState;
 
    } // End state change
 
    // Delay to avoid freakouts if experienced
    // delay(10);
  }
 
}