Open Serial Port

martial123

Hi !

To open serial port, we just need this ligne ? :

port = new QSerialPort();
port->open(QIODevice::ReadWrite);

when i execute, i have an error :

QIODevice::write (QSerialPort): device not open

ps : ( i have config port like this : )

SerialPort::SerialPort(QWidget *parent):
    QDialog(parent)
{

   port = new QSerialPort();
   port->setPortName("portname");
   port->setBaudRate(QSerialPort::Baud115200);
   port->setParity(QSerialPort::NoParity);
   port->setDataBits(QSerialPort::Data8);
   port->setStopBits(QSerialPort::OneStop);

   //bool a = port->open(QIODevice::ReadWrite);
   //cout<< "le port est ouveret ?  " << a << endl;

}```
cout send me : a = 0 if i execute last 2 ligne ... and i see in documentation if port open is successful, so it's return false ...

kuzulis

You need to set a right device name (aka port name) before opening.

mrjj

Hi
just as a note.
This example is very good for testing out serialport
https://doc.qt.io/qt-5/qtserialport-terminal-example.html

martial123

Yes i have see that befor your answer ^^ its COM3 and not portname When i setPortName
ty !