#include <avr/io.h>
#include <avr/interrupt.h>
typedef enum {A,B,C,D, screen} states_t;
states_t stato = A;
volatile uint8_t portbhistory = 0xFF;

uint16_t c=0;
uint16_t b=0;
uint16_t d=0;
uint16_t i=0;
int main (void) {
	DDRD &= ~((1 << DDD4) | (1 << DDD5) | (1 << DDD6)|(1 << DDD2)|(1 << DDD3));

	DDRD &= ~(1 << DDD2);
	DDRD &= ~(1 << DDD3);
	PORTD=0xff;
	DDRC=0xff;
	PCICR |= (1 << PCIE2);
	PCMSK2 |= (1 << PCINT18) | (1 << PCINT19) | (1 << PCINT20)| (1 << PCINT21)| (1 << PCINT22);
	TCCR1B |= (1 << WGM12); // Set the Timer Mode to CTC (Mode 4)

	// Set the value that you want to count to // [ (clock_speed / Prescaler_value) * Desired_interval_in_Seconds ] - 1 // [ (16000000 / 1024) * 0.2 ] -1 = 3124
	OCR1A = 3124;

	// Set interrupt on compare match

	TCCR1B |= (1 << CS12) | (1 << CS10); // starts the timer, set prescaler to 1024

	TIMSK1 |= (1 << OCIE1A);
	sei();

	while (1) {
		switch (stato) {
			case A :
			c=0;
			if(i==5){ PORTC=1;}
				if(i==10){ PORTC=3;}
					while(i>=5 & i<10){if(c==1){stato=B;
					PORTC=0;}
				if(i==15){ PORTC=7;}
			if(i==20){ PORTC=0xf;}
				if(i==25){PORTC=0;}
			break;

			case B: 	  c=0;
			 if(i==5){ PORTC=1;}
			if(i==10){ PORTC=3;}
			while(i>=15 & i<20){if(c==1){stato=C; PORTC=0;}
			if(i==15){ PORTC=7;}
			if(i==20){ PORTC=0xf;}
				if(i==25){PORTC=0;}
			break;
				case C :  b=0;  if(i==5){ PORTC=1;}
				if(i==10){ PORTC=3;}
				while(i>=10 & i<15){if(b==1){stato=D; PORTC=0;}
				if(i==15){ PORTC=7;}
				if(i==20){ PORTC=0xf;}
					if(i==25){PORTC=0;}
				break;
				case D :  d=0; if(i==5){ PORTC=1;}
				if(i==10){ PORTC=3;}
				while(i>=20 & i<25){if(d==1){stato=screen; PORTC=0;}
				if(i==15){ PORTC=7;}
				if(i==20){ PORTC=0xf;}
				if(i==25){PORTC=0;}
				break;
	case screen :    if(i==5){ PORTC=0xf;}
	if(i==10){ PORTC=0; i=0;}

	break;




		}
	}
}

ISR (TIMER1_COMPA_vect){i++;
if(i==26){i=0;}}
	ISR (PCINT2_vect) { uint8_t changedbits;

		changedbits = PIND ^ portbhistory; portbhistory = PIND;

		if(changedbits & (1 << PIND2)) { /* PCINT0 changed */ if( (PIND & (1 << PIND2)) == 1 ) {  /* LOW to HIGH pin change */ } else { d=1;} }
		if(changedbits & (1 << PIND3)) { /* PCINT0 changed */ if( (PIND & (1 << PIND3)) == 1 ) {  /* LOW to HIGH pin change */ } else {c=1; } }
					if(changedbits & (1 << PIND5)) { /* PCINT0 changed */ if( (PIND & (1 << PIND5)) == 1 ) {  /* LOW to HIGH pin change */ } else { b=1;} }
								if(changedbits & (1 << PIND4)) { /* PCINT0 changed */ if( (PIND & (1 << PIND4)) == 1 ) {  /* LOW to HIGH pin change */ } else {  /* HIGH to LOW pin change */ } }

								if(changedbits & (1 << PIND6)) { /* PCINT0 changed */ if( (PIND & (1 << PIND6)) == 1 ) {  /* LOW to HIGH pin change */ } else {  /* HIGH to LOW pin change */ } }

							}

					}