// C++ code
//
int i=0;
void setup()
{
  Serial.begin(9600);
  pinMode(A0, INPUT);
  pinMode(A1, INPUT);
  DDRD = B11111111; // Port D at Arduino Uno (pin 0-7) como saidas
//  Serial.println("hello world");
//  Serial.flush();
  
  //Desabilita o Registrador de entrada digital dos pinos AIN1 e AIN0.
  DIDR1 = 0b00000000;
  //ACD = 0, habilita a energia no comparador analogico
  //ACBG = 0, liga Comparador(+) no pino AIN0
  //ACIE = 0, desabilita interrupção do comparador
  //ACIS1:0 = 00, interrupção por troca - não usado interrupção
  ACSR=(0<<ACD)|(1<<ACBG)|(1<<ACIE)|(0<<ACIS1)|(0<<ACIS0);
  ADCSRA &= (0 << ADEN);   // Disable the ADC module
  ADCSRB &= (0 << ACME);   // Habilita AIN1 no Comparador(-)
  delay(100); // estabilização
  Serial.println("ACSR="+String(ACSR));
}

void loop()
{
  int comp=0;
  i++;
  Serial.print("TesteComp[" + String(i) + "]= ");
    comp=ACSR&(1<<ACI);
  Serial.println(ACSR,BIN);
//  Serial.println();
  if (comp) digitalWrite(7,comp);    
  delay(1000); // Wait for 500 millisecond(s)
}

ISR (ANALOG_COMP_vect) // Interrumption vector for the Analog comparator
{    
    if(ACSR & B00000010)  //If we are into falling edge
    {
        if(!(ACSR & B00100000))//If ACO is 0 (we have that ! for inverse)
        {     //A change from HIGH to LOW was detected
          //Do what you want to do here..        
                digitalWrite(7, HIGH); digitalWrite(6, LOW);
                digitalWrite(2,LOW); 
          ACSR &= ~(1<<ACIE);
          ACSR |= (1<<ACIS1) | (1<<ACIS0);// Remember top set back the interrupt on rising edge for next ISR
          ACSR |= (1<<ACIE);
        }
    }
    if(ACSR & B00000011)   // if we are into rising edge
    {
        if((ACSR & B00100000))  //If ACO is 1 
        {   //A change from LOW to HIGH was detected      
           //Do what you want to do here...
                  digitalWrite(6, HIGH); digitalWrite(7, LOW); 
                   digitalWrite(2,HIGH);  
             ACSR &= ~(1<<ACIE);
             ACSR |= (1<<ACIS1);  ACSR &= ~(1<<ACIS0);  // Remember set back interrupt on falling edge for next ISR     
             ACSR |= (1<<ACIE);
        }    
    }  
    
}