start.cpp

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#include <Arduino.h>

//#define DEBUG_LCD disable Display for simulation; attention: is very slow so be careful within ISR
#include "_debug.h"
#define PD6 6
#define _MAX 0xF

void setup()
{   TCCR1A=0;  // to clear Arduino presets
    TCCR1B=0; 
    cli(); 
    DDRC =0;                        //ADC0 and PORTC = Input
    DDRD |= (1<<PD6);               //Set PD6 (OC0A) = Output
    
    // enable ADU, free running mode, interrupt enable, prescaler=16, start conversion  (ADSC) 
    ADCSRA=(1<<ADEN) | (1<<ADSC) | (1<<ADATE) | (0<<ADIF) | (1<<ADIE) | (1<<ADPS2) | (1<<ADPS1) | (1<<ADPS0);
    // Voltage Reference: AVCC pin, ADLAR ... right/left adjust for 10Bit
    ADMUX= ((0<<REFS1) | (1<<REFS0) | (0<<ADLAR));
    

    TCCR1B |=(1<<WGM11)|(1<<WGM10); //Fast PWM 10Bit
    
    TCCR1B |= (1<<CS10);            //Prescaler:
    TIMSK1 |=(1<<OCIE1A)|(1<<TOIE1); //Timer1 comp int enable, overflow int enable
    sei();
    OCR1A = _MAX;                   //Only for simulation use
    
}

void loop()
{
   
}

ISR(ADC_vect){
    T("ADU complete");  //trace
    OCR1A = ADC; //Value for the CompareMatch 16bit
    OCR1A = _MAX; //debug only
}
ISR(TIMER1_COMPA_vect){
    T("Compare Match");
    PORTD |=(1<<PD6);   //set
}
ISR(TIMER1_OVF_vect){
    T("Timer1 overflow");
    PORTD &= ~(1<<PD6); //reset
}