CODEWITHSUNDEEP
qtc++11serial-portuart
Łukasz Przeniosło
Łukasz Przeniosło

Reputation: 2959

Unable to send data using QSerialPort

I am trying to write a QT application that will be able to communicate with my embedded system using serial port. For now I am testing the config with Null Modem emulator as I don't have the embedded system ready yet.

The emulator works fine as I have tested it in other software like Terraterm, RealTerm or Putty. My problem is that my example code doesn't work - it doesn't send the string to another com port.

This is my code:

void CSettingsDialog::on_pbSerialCheck_clicked()
{
    QSerialPort serial;
    serial.setPortName(ui->cbSerialPort->currentText());

    if (!serial.open(QIODevice::ReadWrite))
    {
        QMessageBox::warning(this, tr("Serial port"),
                             tr("Serial port %1 is busy!")
                            .arg(ui->cbSerialPort->currentText()));
    }
    else
    {
        serial.setBaudRate(QSerialPort::Baud115200);
        serial.setDataBits(QSerialPort::Data8);
        serial.setParity(QSerialPort::NoParity);
        serial.setStopBits(QSerialPort::OneStop);
        serial.setFlowControl(QSerialPort::NoFlowControl);
        serial.write("TEST\n");
        serial.close();
    }
}

I am certain that I have everything set correctly looking at the QT examples.

Upvotes: 1

Views: 767

Answers (1)

Werner Erasmus
Werner Erasmus

Reputation: 4076

I am certain that I have everything set correctly looking at the QT examples. I would aprichiate all help!

When reading flush documentation, it seems that calling "write" buffers, with writes possible finishing asynchronously.

Also see "Certain subclasses of...are asynchronous", with comments on waitForBytesWritten

Upvotes: 1

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