#include <avr/io.h>
#define F_CPU 16000000UL // Define CPU frequency as 1 MHz for delay calculations

#include <util/delay.h>
//**https://docs.arduino.cc/retired/hacking/hardware/PinMapping2560/
#include <avr/interrupt.h>

volatile uint8_t count=0;

// Function prototypes
void aufgabe1(void);
void aufgabe2(void);

int main(void) {
	// Initialize PortB as output
	DDRB = 0xFF;  // Set all pins of Port B as outputs
	PORTB = 0xFF; // Initially turn off all LEDs

	aufgabe1();  // Call Aufgabe1 for LED bouncing with delay
	//aufgabe2(); // Call Aufgabe2 for LED bouncing using Timer1 delay
}

void aufgabe1(){
	uint8_t flag=1;
	//SW2 neg. edge -> INT0-PD0, ISC0 1/0=10
	//SW3 neg. edge -> INT1-PD1, ISC1 1/0=10
	sei();
	//order is important
	//MCUCR
	EICRA|=(1<<ISC11) | (1<<ISC01)|(1<<ISC10) | (1<<ISC00);
	//EICRA&=~((1<<ISC10) | (1<<ISC00));
	//GICR
	EIMSK|= (1<<INT1) | (1<<INT0);

	//DDRD=0x00;
	//PORTD |= (1<<PD0) | (1<<PD1);
	
	while(1){
		PORTB=count;
	}
}

ISR(INT0_vect){
	 count++;
	//while(PIND || ~(1<<PD0));
}

ISR(INT1_vect){
	count--;
}