start.cpp

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#include <Arduino.h>

//#define DEBUG_LCD
#include "_debug.h"

void setup()
{
    DIDR0=(1<<ADC0D); //disable ADC0 digital Buffer
    ADMUX|=(1<<REFS1) | (0<<REFS0);  //internal 1.1 reference  ADC0 as input
    ADMUX|=(1<<ADLAR);  //left adjust result, so 8 Bits in ADCH are used 
    
    ADCSRA|=(1<<ADEN); //enable ADU
    ADCSRA|=(1<<ADATE); // auto conversion
    ADCSRA|=(1<<ADIE);  // interrupt enable
    ADCSRA|=(1<<ADPS2) | (0<<ADPS1) | (0<<ADPS0); //Conversion Prescaler = 16  means 1MHz conversion clock)
    ADCSRB=(1<<ADTS2) | (0<<ADTS1) | (0<<ADTS0);  // use Timer0 Overflow as start of conversion

    sei();
}

void loop()
{
    volatile static int dummy=0; dummy++;  //needed for simulator if no additional lines of code
}

ISR(ADC_vect)
{
    // ADC comes up here when he done converting....
    PORTB = ADCH; //most significant bits of the result
    static int n=0; n++; 
    TDEC(n); 
}