Serial.setTimeout()
Description
Cette fonction fixe le délai maximum en millisecondes à attendre pour la lecture de flux de données. La valeur par défaut est 1000 millisecondes (=1 seconde).
En pratique, ce délai est utilisé par les fonctions de la classe Serial suivantes:
Syntaxe
Serial.setTimeout(time)
Paramètres
- Serial: tout objet d'une classe utilisant la classe Serial
- time: délai maximum en millisecondes à attendre pour la lecture de flux de données (long)
Valeurs Renvoyées
- Aucune
Exemple
- Compile and upload the below code to Arduino
void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
Serial.setTimeout(100); // set new value to 100 milliseconds
Serial.print("Timeout: ");
Serial.println(Serial.getTimeout()); // print the new value
}
void loop() {
// check if data is available
if (Serial.available() > 0) {
// read the incoming string:
String incomingString = Serial.readString();
// prints the received data
Serial.print("I received: ");
Serial.println(incomingString);
}
}
- Type "Arduino" on Serial Monitor and click Send button:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
Timeout: 100
- The result on Serial Monitor:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
Timeout: 100
I received: Arduino
- Modify the code to change timeout from 100ms to 1ms
void setup() {
Serial.begin(9600); // opens serial port, sets data rate to 9600 bps
Serial.setTimeout(1); // set new value to 1 milliseconds
Serial.print("Timeout: ");
Serial.println(Serial.getTimeout()); // print the new value
}
void loop() {
// check if data is available
if (Serial.available() > 0) {
// read the incoming string:
String incomingString = Serial.readString();
// prints the received data
Serial.print("I received: ");
Serial.println(incomingString);
}
}
- Compile and upload the above code to Arduino
- Type "Arduino" on Serial Monitor and click Send button:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
Timeout: 100
I received: Arduino
Timeout: 1
- The result on Serial Monitor:
8
Serial.println("Hello World!");
Message (Enter to send message to 'Arduino Uno' on 'COM15')
New Line
9600 baud
Timeout: 100
I received: Arduino
Timeout: 1
I received: A
I received: r
I received: d
I received: u
I received: i
I received: no
When timeout is small, a single string is read multiple time.
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