button.h

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#define PINB_MASK ((1<<PINB4)|(1<<PINB6)|(1<<PINB7))
#define PINE_MASK ((1<<PINE2)|(1<<PINE3))

#define BUTTON_A    6   ///< UP
#define BUTTON_B    7   ///< DOWN
#define BUTTON_C    2   ///< LEFT
#define BUTTON_D    3   ///< RIGHT
#define BUTTON_O    4   ///< PUSH

// defines for button press detection
#define BUTTON_TIMEOUT_VALUE (TIMER0_TICKSPERSECOND/50)

// defines for Button Matrix Option
#define MATRIXPORT  PORTD   ///< use PORTD to mux the joystick pins
#define MATRIXDDR   DDRD  
#define MATRIXCOLS  7       ///< setup 7 columns from 0..6
#define MATRIXROWS  3       ///< setup 3 rows on PORTB4,6,7
#define MATRIXDELAY TIMER0_TICKSPERSECOND/50    ///< number of timer calls before scanning next column

#define KEY_NULL        0   ///< No key has been pressed
#define KEY_ENTER       1       ///< Center click detected
#define KEY_NEXT        4       ///< Right click detected
#define KEY_PREV        5       ///< left click detected
#define KEY_PLUS        2       ///< up click detected
#define KEY_MINUS       3   ///< down click detected
#define KEY_JOYSTICKMAX 5   ///<Maxvalue for KEY from joystick press

void PinChangeInterrupt(void);
void Button_Init(void);
char getkey(void);
char ButtonBouncing(void);