//By Tyler Gerritsen
//2017-07-09
//vtgerritsen@gmail.com

/*
Handles reading and debouncing button input
Returns a 1 for short hold and a 2 for long hold
*/

#define BUTTON_DEBOUNCE
#define BUTTON_LONGHOLD


uint8_t readBtn(){  //Return 1 if short pressed & released, Return 2 if long pressed PRIOR to release
  static unsigned long debounceTimer;
  static unsigned int buttonRead;
  static byte buttonPos;
  
  buttonRead = digitalRead(0);	//For pullup input
  //buttonRead = 1 - digitalRead(0);	//For pulldown
  
  if (buttonRead && millis() > debounceTimer){   //Button depressed
    if (!buttonPos){
      buttonPos = 1;
      debounceTimer = millis() + BUTTON_LONGHOLD;
    }
    else if (buttonPos == 1){
      buttonPos = 2;
      return 2;
    }
  }
  else if (buttonPos && !buttonRead) {
    debounceTimer = millis() + BUTTON_DEBOUNCE;
    if (buttonPos == 1) {
      buttonPos = 0;
      return 1;
    }
    buttonPos = 0;
  }
  return 0;
}