Teste_travamento_no_Setup

byte xpto = 0;
  //-----------------------------------------
  void setup()
  {
    Serial.begin(9600);
    while(xpto == 0)
    {
      if (Serial.available() > 0)
        {
          xpto = Serial.read();
        }
      }
    }
  //-----------------------------------------
  void loop()
  {
      Serial.println(millis());
  }