QSerialport reading blocks writing even using readyRead()

RolBri

Hi,

I am having a problem with QSerialPort and sadly I have no clue to solve it.
So it would be very great if you could help me ;-)

I am using the readyRead-signal for calling the following function:

void SerialPort::readSerialData()
{
    char ch;
    while(device->bytesAvailable())
    {
        device->getChar(&ch);
        serialDataBuffer+=ch;
        if(ch == '\r')
        {
            dateTime= QDateTime::currentDateTime();
            message= serialDataBuffer;
            emit newMessage(message,dateTime);
            serialDataBuffer.clear();
        }
    }
}

This is how my writing function looks:

void SerialPort::writeString(QByteArray message)
{
    if(device->isOpen() && device->isWritable())
    {
        device->write(message);
        device->flush();
        if (!device->waitForBytesWritten(100)) std::cerr << "Error writing message" << std::endl;
    }
    else
        std::cerr << "Device is not writeable or not open! "<< std::endl;

}

I need to send 5 different messages every second.
Therefore I have another thread with a QTimer. Whenever the timer is elapsed the write function above is called with a Qt::QueuedConnection.

Whenever I now have a data input this is blocking the writing.
I tried to share the pointer for the QSerialPort-instance with two threads (one for writing and one for reading), but it says that QSerialPort cannot have different parents.

How can I solve this?

Thank you very much :-)

SGaist

Hi,

What about reading the whole buffer and then search for the first occurrence of '\r' ? That way you avoid to loop on the input