#include <stdint.h>
#include <SeeedTouchScreen.h> 

#if defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__) // mega
#define YP A2 
#define XM A1 
#define YM 54 
#define XP 57 

#elif defined(__AVR_ATmega32U4__) //leonardo
#define YP A2 
#define XM A1
#define YM 18 
#define XP 21

#else
#define YP A2 
#define XM A1
#define YM 14 
#define XP 17 

#endif

TouchScreen ts = TouchScreen(XP, YP, XM, YM);