#define set0(r,b) r&=~(1<<b)
#define set1(r,b) r|=(1<<b)
#define test(r,b) (r&(1<<b))

#include <LiquidCrystal.h>
LiquidCrystal lcd (13,12,11,10,9,8);

int cislo;
int pred = 0;
void setup() {
lcd.begin(16,2);
lcd.print("FREKVENCIA:   MHz");

set0(DDRD,7);
set1(PORTD,7);

set0(ADMUX,REFS1); 
set0(ADMUX,REFS0);
set0(ADMUX,ADLAR); 
set1(ADMUX,MUX0); 
set0(ADMUX,MUX1);
set0(ADMUX,MUX2);
set0(ADMUX,MUX3);
set1(ADCSRA,ADEN); 
set0(ADCSRA,ADATE); 
set0(ADCSRA,ADIE); 
set1(ADCSRA,ADPS2);
set1(ADCSRA,ADPS1);
set1(ADCSRA,ADPS0);

set1(PCICR,PCIE2);
set1(SREG,7);
set1(PCMSK2,PCINT23);

}

void loop() {

set1(ADCSRA,ADSC); 
while(test(ADCSRA,ADIF)==0); 
int znak = ADCL; 
znak = znak | (ADCH<<8);
cislo= map(znak,0,1023,88,108);

if(cislo != pred){
lcd.setCursor(11,0);
lcd.print(cislo);
pred=cislo;
if (cislo < 99){
  lcd.setCursor(13,0);
lcd.print(" ");
}
}

}

ISR(PCINT2_vect){

if(test(PIND,7)== 0){ 
lcd.setCursor(0,0);
lcd.print("FREKVENCIA:   kHz");
lcd.setCursor(11,0);
lcd.print(cislo);
}

if(test(PIND,7)!= 0) {
lcd.setCursor(0,0);
lcd.print("FREKVENCIA:   MHz");
lcd.setCursor(11,0);
lcd.print(cislo);
}
}