#include <avr/io.h>

#define F_CPU 4e6

#include <util/delay.h>



#define Modul1 	PORTD, PORTD2

#define Modul2 	PORTD, PORTD1





#define	setbit(IO) __setbit(IO)

#define	__setbit(PORT, BIT) PORT |= (1<<BIT)



#define	clearbit(IO) __clearbit(IO)

#define	__clearbit(PORT, BIT) PORT &=~ (1<<BIT)



#define debounce( port, pin )										\

({																	\

  static uint8_t flag = 0;	/* new variable on every macro usage */	\

  uint8_t i = 0;													\

																	\

  if( flag ){			/* check for key release: */				\

    for(;;){			/* loop ... */								\

      if( !(port & 1<<pin) ){	/* ... until key pressed or ... */	\

	i = 0;			/* 0 = bounce */								\

	break;															\

      }																\

      _delay_us( 20 );		/* * 256 = 25ms */						\

      if( --i == 0 ){		/* ... until key >25ms released */		\

	flag = 0;		/* clear press flag */							\

	i = 0;			/* 0 = key release debounced */					\

	break;															\

      }																\

    }																\

  }else{			/* else check for key press: */					\

    for(;;){			/* loop ... */								\

      if( (port & 1<<pin) ){	/* ... until key released or ... */	\

	i = 0;			/* 0 = bounce */								\

	break;															\

      }																\

      _delay_us( 20 );		/* * 256 = 25ms */						\

      if( --i == 0 ){		/* ... until key >25ms pressed */		\

	flag = 1;		/* set press flag */							\

	i = 1;			/* 1 = key press debounced */					\

	break;															\

      }																\

    }																\

  }																	\

  i;				/* return value of Macro */						\

})





volatile uint8_t zaehler[2];



//Initialisierung

void init( void )

{

	DDRB  = 0xFF;		//Port B Ausgang

	PORTB = 0b00000001;	//Alle Pins HIGH

	DDRD  = 0b0000110;	//Port D Pin6,5,4,3,0 Eingänge; Pin 2,1 Ausgänge

	PORTD = 0b1111111;	//Alle PullUp-Widerstände 6...3 ein; Ausgänge auf HIGH (PNP Transistoren aus)

}



//Ausgabemuster für 7Segment-Anzeige

void SiebenSegAnz(uint8_t a)	

{

	switch(a)

	{	

		case 9:		PORTB = 0b00110000;		break;

		case 8:		PORTB = 0b00000000;		break;	

		case 7:		PORTB = 0b11110000;		break;

		case 6:		PORTB = 0b00000110;		break;

		case 5:		PORTB = 0b00100100;		break;

		case 4:		PORTB = 0b00110010;		break;

		case 3:		PORTB = 0b01100000;		break;

		case 2:		PORTB = 0b01001000;		break;

		case 1:		PORTB = 0b11110010;		break;

		case 0:		PORTB = 0b10000000;		break;

		default:	PORTB = 0b01111110;

	}

}



int main(void)

{

	init();



	zaehler[0]=9;

	zaehler[1]=9;



	for(;;)

	{

		if( debounce( PIND, PD3 ) ) zaehler[0]++;

		if( debounce( PIND, PD4 ) ) zaehler[0]--;

		if( debounce( PIND, PD6 ) ) zaehler[1]++; 	

		if( debounce( PIND, PD5 ) ) zaehler[1]--; 

			

		if((zaehler[0] < 1) || (zaehler[1] < 1))	//Rücksetzen erst möglich

		{											//wenn ein Zähler auf Null	

			if( debounce( PIND, PD0 ) ) 

			{	

				zaehler[0]=9;

				zaehler[1]=9;

			}

		}



		//Zähler 1

		clearbit	(Modul1);		//Erstes Modul ein

		SiebenSegAnz (zaehler[0]);	//Wert von Zähler 1 ausgeben

		_delay_ms(1);				//Anzeige 1ms stehen lassen

		setbit		(Modul1);		//Erstes Modus aus



		//Zähler 2

		clearbit	(Modul2);

		SiebenSegAnz (zaehler[1]);

		_delay_ms(1);

		setbit		(Modul2);



	}



}