#include <avr/io.h>
#include <util/delay.h>

#define	OFF		0
#define	ON		1

#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( 98 );    /* * 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( 98 );    /* * 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 */    \
})


uint8_t switch1 = 0;			//Merker fuer Zustand des Ausgangs_1
uint8_t switch1_test = 0;		//Merker ob Verriegelung_1

uint8_t switch2 = 0;			//Merker fuer Zustand des Ausgangs_2
uint8_t switch2_test = 0;		//Merker ob Verriegelung_2

uint8_t switch3 = 0;			//Merker fuer Zustand des Ausgangs_3
uint8_t switch3_test = 0;		//Merker ob Verriegelung_3

uint8_t switch4 = 0;			//Merker fuer Zustand des Ausgangs_4
uint8_t switch4_test = 0;		//Merker ob Verriegelung_4




int main(void)
 {
	DDRA &= ~(1<<PA0) | (1<<PA1) | (1<<PA2) | (1<<PA3) | (1<<PA4) | (1<<PA5) | (1<<PA6) | (1<<PA7); 
	DDRB  =  (1<<PB0) | (1<<PB1) | (1<<PB2) | (1<<PB3) | (1<<PB4) | (1<<PB5) | (1<<PB6) | (1<<PB7);
				
while(1)
{		
			
			
// LED_1, Schalter_1

		if( debounce(PINA ,PA0) && (switch1_test == OFF) && (switch1 == OFF) )
			{
				switch1 = ON;
				switch1_test = ON;
			}
		
		if( PINA & (1<<PA0)) 
			{
 				switch1_test = OFF;
			} 
		
		if( debounce(PINA ,PA0) && (switch1_test == OFF) && (switch1 == ON) )
			{
				switch1 = OFF;
				switch1_test = ON;
 			}

		if( switch1 == ON ) 
			{
				PORTB |= (1<<PB0);
		   	}
		
		if( switch1 == OFF )
			{
				PORTB &= ~(1<<PB0);
			}
			

// LED_2, Schalter_2	
		
		if( debounce(PINA, PA1) && (switch2_test == OFF) && (switch2 == OFF) )
			{
				switch2 = ON;
				switch2_test = ON;
			}
		
		if( PINA & (1<<PA1) ) 
			{
				switch2_test = OFF;
			} 
					
		if( debounce(PINA, PA1) && (switch2_test == OFF) && (switch2 == ON) )
			{
				switch2 = OFF;
				switch2_test = ON;
			}

		if( switch2 == ON )
			{
				PORTB |= (1<<PB1);
			}
		
		if( switch2 == OFF )
			{
				PORTB &= ~(1<<PB1);
			}
		

// LED_3, Schalter_3
		
		if( debounce(PINA, PA2) && (switch3_test == OFF) && (switch3 == OFF) )
			{
				switch3 = ON;
				switch3_test = ON;
			}
		
		if( PINA & (1<<PA2) ) 
			{
				switch3_test = OFF;
			} 
		
		if( debounce(PINA, PA2) && (switch3_test == OFF) && (switch3 == ON) )
			{
				switch3 = OFF;
				switch3_test = ON;	
			}

		if( switch3 == ON )
			{
				PORTB |= (1<<PB2);
			}
		
		if( switch3 == OFF )
			{
				PORTB &= ~(1<<PB2);
			}


// LED_4, Schalter_4

		if( debounce(PINA, PA3) && (switch4_test == OFF) && (switch4 == OFF) )
			{
				switch4 = ON;
				switch4_test = ON;
			}
		
		if( PINA & (1<<PA3) ) 
			{
				switch4_test = OFF;
			} 
		
		if( debounce(PINA, PA3) && (switch4_test == OFF) && (switch4 == ON) )
			{
				switch4 = OFF;
				switch4_test = ON;
			}

		if( switch4 == ON )
			{
				PORTB |= (1<<PB3);
			}
		
		if( switch4 == OFF )
			{
				PORTB &= ~(1<<PB3);
			}


// LED_5, Schalter_5


		if (debounce(PINA, PA4)) 
			{		
				PORTB |= (1<<PB4);
			}
		
		if (PINA & (1<<PA4))
			{
			 	PORTB &= ~(1<<PB4);
			}
			 		
	
// LED_6, Schalter_6

		if (debounce(PINA, PA5)) 
			{
				PORTB |= (1<<PB5);
			}
		
		if( PINA & (1<<PA5) ) 
			{
				PORTB &= ~(1<<PB5);
			} 
		
		
// LED_7, Schalter_7


		if (debounce(PINA, PA6)) 
			{
				PORTB |= (1<<PB6);
			}
		
		if( PINA & (1<<PA6) ) 
			{
				PORTB &= ~(1<<PB6);
			} 
				

// LED_8, Schalter_8


		if (debounce(PINA, PA7)) 
			{
				PORTB |= (1<<PB7);
			}
		
		if( PINA & (1<<PA7) ) 
			{
				PORTB &= ~(1<<PB7);
			} 
					
	
}
return 0;
}