Detect certain characters and if not a consequence

Question

How can I program in Arduino Uno a serial.available that will detect some chars that aren't supposed to belong in a list of options, like this:

void lerRespostaUtilizador(){
  if(Serial.available('s' && 'v' && 'r'){
    Serial.println("Podes visualizar: (s)inais de controlo, (v)ariaveis do sistema e conteudo de (r)egistos.")
  }
  switch(Serial.read()){
    case 's': // Mostrar sinais de controlo
      mostrarSinais();
      Serial.println("Podes visualizar ainda: (v)ariaveis do sistema e conteudo de (r)egistos.");
      Serial.println("");
      break;
    case 'v': // Mostrar variáveis do sistema
      mostrarVariaveis();
      Serial.println("Podes visualizar ainda: (s)inais de controlo e conteudo de (r)egistos.");
      Serial.println("");
      break;
    case 'r': // Mostrar conteúdo de registos
      mostrarRegistos();
      Serial.println("Podes visualizar ainda: (s)inais de controlo e (v)ariaveis do sistema.");
      Serial.println("");
      break;
    }
}

What I want is if the user inserts some chars that aren't 's', 'v' or 'r', a message will appear saying what they can insert to obtain certain results.

Check this Serial.available('s' && 'v' && 'r'). I can guess what you think it means but it does not. — Mikael Patel
– Mikael Patel, Commented May 4, 2017 at 14:36
Simply wait for something to read, read the character, and add a default switch section case that catches illegal characters. — Mikael Patel
– Mikael Patel, Commented May 4, 2017 at 14:38

Mikael Patel · Accepted Answer · 2017-05-04 14:41:50Z

1

I would rewrite that as something like this:

void lerRespostaUtilizador(){
  while (!Serial.available());
  switch(Serial.read()){
    case 's': // Mostrar sinais de controlo
      mostrarSinais();
      break;
    case 'v': // Mostrar variáveis do sistema
      mostrarVariaveis();
      break;
    case 'r': // Mostrar conteúdo de registos
      mostrarRegistos();
      break;
    default:
      Serial.println(F("Podes visualizar: (s)inais de controlo, (v)ariaveis do sistema e conteudo de (r)egistos."));
    }
}

answered May 4, 2017 at 14:41

Mikael Patel

7,9892 gold badges16 silver badges21 bronze badges

Yeap, that works perfectly! But can you explain me how the while works and how is it connected to the default option?

Dark Kool
– Dark Kool

2017-05-04 14:45:48 +00:00
Commented May 4, 2017 at 14:45

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