#define F_CPU 1000000UL     
    
    #include <avr/io.h>  
    #include <stdio.h>  
    #include <stdlib.h>  
    #include <util/delay.h>
    

 

    
     void init_pwm () {
	// timer 1 (PWM)
	TCNT1 = 0; // timer count
	OCR1A = 0; // compare A - pwm0
	OCR1B = 0; // compare B - pwm1
	TCCR1A = (1<<COM1A1) | (1<<COM1B1) | (1<<WGM11) | (1<<WGM10); // fast PWM
	TCCR1B =  (1<<CS10); 
    
    // timer 2 (PWM)
	TCNT2 = 0; // timer count
	OCR2 = 0; // compare A	- pwm2
	TCCR2 = (1<<COM21) | (1<<WGM20) | (1<<CS20); //fast PWM

	
    }
      
    int main(void)   
    {  

	unsigned char pwm0 = 0, pwm1 = 0, pwm2=0;
	DDRD=0x00;              //nastaveni jak vstup  
	PORTD=0xFF;             //nastaveni pull-up rezistoru
	

	
	
	init_pwm();


	while (1) {
    
        //prvni led	

		if(!(PIND&(1<<PD0)))        //testovani na log 0
		{
		pwm0++;	
		_delay_ms(10);
		}


		if(!(PIND&(1<<PD1))) 
		{
		pwm0--;	
		_delay_ms(10);
		}

        // druha led

        if(!(PIND&(1<<PD2))) 
		{
		pwm1++;	
		_delay_ms(10);
		}


		if(!(PIND&(1<<PD3))) 
		{
		pwm1--;	
		_delay_ms(10);
		}

        // treti led

        if(!(PIND&(1<<PD4))) 
		{
		pwm2++;	
		_delay_ms(10);
		}


		if(!(PIND&(1<<PD5))) 
		{
		pwm2--;	
		_delay_ms(10);
		}

        //vynulovani PWM

        if(!(PIND&(1<<PD6)))
        {
        pwm0=0;
        pwm1=0;
        pwm2=0;
        }
		
		// toto je tu ,aby if pwm==0 nesvitilo nic (jinak malinko sviti furt...)
        //prvni led
		if (pwm0) {
			OCR1A = pwm0;
			DDRB |= (1<<PB1);
		} else {
			DDRB &= ~(1<<PB1);
		        }


        //druha led

         if (pwm1) {
			OCR1B = pwm1;
			DDRB |= (1<<PB2);
           
		} else {
			DDRB &= ~(1<<PB2);
                }

        //treti led
        if (pwm2) {
			OCR2 = pwm2;
			DDRB |= (1<<PB3);
		} else {
			DDRB &= ~(1<<PB3);
		}

	
	}

}