Not reading data from hardware device using qextserialport in Mac OS

**arunkumaraymuo1** · 14th July 2012, 04:56

I included include(src/qextserialport.pri) in my pro file and added src directry to my project

I created one Dialog(Member to main class) to configure serial port and I popup from main Window an I used the following code in OK button

Qt Code:

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void SerianConnectionDialog::on_btnOK_clicked()
{
    if (!port->isOpen()) {
        port->setPortName(ui->portBox_2->currentText());
        port->open(QIODevice::ReadWrite);
    }
 
    //If using polling mode, we need a QTimer
    if (port->isOpen() && port->queryMode() == QextSerialPort::Polling)
        timer->start();
     this->accept();
}

void SerianConnectionDialog::on_btnOK_clicked()
{
    if (!port->isOpen()) {
        port->setPortName(ui->portBox_2->currentText());
        port->open(QIODevice::ReadWrite);
    }

    //If using polling mode, we need a QTimer
    if (port->isOpen() && port->queryMode() == QextSerialPort::Polling)
        timer->start();
     this->accept();
}

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In My main class I concted the ready read of function

Qt Code:

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void MainWindow::connectSerialPort()
{
 
    if(QDialog::Accepted== dlg.exec())
    {
 
 
        this->port= dlg.port;
        ui->led->turnOn(port->isOpen());
 
        timer->setInterval(40);
 
        connect(timer, SIGNAL(timeout()), SLOT(onReadyRead()));
        connect(port, SIGNAL(readyRead()), SLOT(onReadyRead()));
    }
}

void MainWindow::connectSerialPort()
{

    if(QDialog::Accepted== dlg.exec())
    {
    
    
        this->port= dlg.port;
        ui->led->turnOn(port->isOpen());
    
        timer->setInterval(40);
    
        connect(timer, SIGNAL(timeout()), SLOT(onReadyRead()));
        connect(port, SIGNAL(readyRead()), SLOT(onReadyRead()));
    }
}

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And I coded to display data in a texedit

Qt Code:

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void MainWindow::onReadyRead()
{
    if (port->bytesAvailable()) {
        ui->textEdit->moveCursor(QTextCursor::End);
        ui->textEdit->insertPlainText(QString::fromLatin1(port->readAll()));
         ui->textEdit->insertPlainText(QString::fromLatin1("\n"));
    }
}

void MainWindow::onReadyRead()
{
    if (port->bytesAvailable()) {
        ui->textEdit->moveCursor(QTextCursor::End);
        ui->textEdit->insertPlainText(QString::fromLatin1(port->readAll()));
         ui->textEdit->insertPlainText(QString::fromLatin1("\n"));
    }
}

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But not showing any data from device. Any error in my code ?

The port showing open in Main class but not getting data to textbox
when I run CoolTerm application it showing the data correctly

**Lesiok** · 14th July 2012, 08:04

Where do you set the port parameters ?

**arunkumaraymuo1** · 14th July 2012, 14:58

In a Serial port setting dialog an when the user click on OK button it assign to parent class member

if(QDialog::Accepted== dlg.exec())
{

this->port= dlg.port;
ui->led->turnOn(port->isOpen());

timer->setInterval(40);

connect(timer, SIGNAL(timeout()), SLOT(onReadyRead()));
connect(port, SIGNAL(readyRead()), SLOT(onReadyRead()));
}