sepic

#include <avr/io.h>

uint16_t adc_read(uint8_t pinc){
    ADMUX = (1<<REFS1)|(1<<REFS0)|pinc;
    ADCSRA |= (1<<ADSC);
    while( ADCSRA & (1 << ADSC )){};
    uint8_t lsb = ADCL;
    uint8_t msb = ADCH;
    uint16_t t = lsb + (msb<<8);
    return t;
};


int main(void)
{
    DDRB = (1<<PINB1);
    PORTB = (0<<PINB1);

    TCCR1A = (1<<COM1A1)|(0<<COM1A0)|(0<<COM1B1)|(0<<COM1B0)|(1<<WGM11);
    TCCR1B = (1<<WGM13)|(1<<CS10);

    TCNT1 = 0x00F0;

    ICR1 = 160; // top / duty

    OCR1A = 120; // compare /

    PRR = 0;
    ADCSRA = (1<<ADEN)|(1<<ADPS2)|(1<<ADPS1)|(1<<ADPS0);
    ADMUX = (1<<REFS1)|(1<<REFS0);

    uint16_t ocr1a = 100;
    uint16_t set = 512;

    while (1)
    {
        uint16_t temp = adc_read(0);

        if( temp > set ){
            ocr1a += 1;
        }else{
            ocr1a -= 1;
        }

        if( ocr1a < 50  ){
            ocr1a = 50;
        }

        if( ocr1a > 160 ){
            ocr1a = 160;
        }

        OCR1A = ocr1a;

    };
};