Arduino

Reference Language | Libraries | Comparison | Changes

## SoftwareSerial: listen()

#### Description

Enables the selected software serial port to listen. Only one software serial port can listen at a time; data that arrives for other ports will be discarded. Any data already received is discarded during the call to listen() (unless the given instance is already listening).

#### Syntax

mySerial.listen()

#### Parameters

mySerial:the name of the instance to listen

#### Returns

None

#### Example

#include <SoftwareSerial.h>
// software serial : TX = digital pin 2, RX = digital pin 3
SoftwareSerial portOne(2, 3);
// software serial : TX = digital pin 4, RX = digital pin 5
SoftwareSerial portTwo(4, 5);
void setup()
{
// Start the hardware serial port
Serial.begin(9600);
// Start both software serial ports
portOne.begin(9600);
portTwo.begin(9600);
}
void loop()
{
portOne.listen();
if (portOne.isListening()) {
Serial.println("Port One is listening!");
}else{
Serial.println("Port One is not listening!");
}
if (portTwo.isListening()) {
Serial.println("Port Two is listening!");
}else{
Serial.println("Port Two is not listening!");
}
}
[Get Code]

#### See also

- SoftwareSerial()
- read()
- print()
- println()

Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

©Arduino | Edit Page | Page History | Printable View | All Recent Site Changes