// 9.6 MHz, built in resonator
#define F_CPU 9600000
#define LED PB1
#define LED1 PB0


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


void pwm_setup (void)
{
    // Set Timer 0 prescaler to clock/8.
    // At 9.6 MHz this is 1.2 MHz.
    TCCR0B |= (1 << CS01);


    // Set to 'Fast PWM' mode
    TCCR0A |= (1 << WGM01) | (1 << WGM00);

    // Clear OC0B output on compare match, upwards counting.
    TCCR0A |= (1 << COM0B1);
}

void pwm_write (int val)
{
    OCR0B = val;
}

int main (void)
{
    int pwm = 0;
    int count = 0;

    // LED is an output.
    DDRB |= (1 << LED);
    DDRB |= (1 << LED1);

    pwm_setup();

    while (1) {

        // Get the ADC value
        //adc_in = adc_read();
        // Now write it to the PWM counter
        pwm_write(pwm);
        _delay_ms(5);

        if (pwm==255)
        {
            count = 1;
        }
        if (pwm==0)
        {
            count = 0;
        }

        if (count == 0)
        {
            pwm++;
        }
        if (count == 1)
        {
            pwm--;
        }



    }
}