start.cpp

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#include <Arduino.h>

#define DEBUG_LCD
#include "_debug.h"

void setup()
{   
    //kill Arduino Timer0 Interrupt;  millis() not available!
    TIMSK0 &=~_BV(TOIE0);
    TCCR2A = 0; //clear flags set by arduino
    TCCR1A = 0; 
    TCCR1B = 0; 
    
    // To Select ADC0 the Mux Settings are 0-0-0-0 => not neccessary to set Zero...
    ADMUX |=_BV(REFS0); // Vref  -- ver.1.1 internal 1.1 Voltage Rererence would be better 
    ADCSRA|= _BV(ADEN); // Enable ADC
    ADCSRA|=_BV(ADIE); // Interrupt Enable for ADC
    ADCSRA |= _BV(ADPS0); // Set Clock Division Factor to 128 for better quality
    ADCSRA |= _BV(ADPS1); //-------------------------,--------------------------
    ADCSRA |= _BV(ADPS2); //-------------------------,--------------------------
    TCCR2B |= _BV(CS22); //Set Prescaler of Timer2 to 64, timer starts now
    TIMSK2 |= _BV(TOIE2); // Enable Flag for Timer2
    TCNT2 = 6; // Set count to 6 to get an OVF every 1ms  @16Mhz --> (256-6)x64x62.5ns=1ms
    DDRB = 0xFF;
    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 = ADCL; // in ADCL the first 8 bits are written (digital result of the ADC), write these bits to PORTB
    //T("A")
}

ISR(TIMER2_OVF_vect)
{
    T("T")
    TCNT2 = 6; // Set count to 6 again so we get an OFV in 1ms
    ADCSRA |= _BV(ADSC); // Start single conversion when Timer Overflow
}