Problem with QSerialPort

AngrySkarpeta

Hi,
I tried to open port (i want to send letter 'F' to arduino via bluetooth) but immediately i get error "Semaphore limit exceeded " (it can be a little bit different because i get error in my language ).
Below i post part of the code

        serial.setPortName("COM6");
        if(!serial.open(QIODevice::ReadOnly)){
        QMessageBox::critical(this, tr("Error"), serial.errorString());
        return;}
               serial.setBaudRate(9600);
               serial.setDataBits(QSerialPort::Data8);
               serial.setParity(QSerialPort::NoParity);
               serial.setStopBits(QSerialPort::OneStop);
               serial.setFlowControl(QSerialPort::NoFlowControl);
                if (serial.isOpen() && serial.isWritable()){
                       qDebug() << "Serial is open";

It would be awesome if someon could help me.

? Offline

Hi! Have you tried to run one of the Qt Serial Port Examples?

AngrySkarpeta

@Wieland Yes i tried one of them, also tried project blubot from github. It seems to be problem not with code but with windows, does you ever encouter something like that?

mrjj

Hi
Did you try other function of BT ?
Are the board and the pc connected`?

You could also try
http://doc.qt.io/qt-5/qtbluetooth-btfiletransfer-example.html

AngrySkarpeta

Pc and arduino are connected :-) I was thinking about using qbluetooth but it seems to be excesive if i want just send letter ;-)

mrjj

@AngrySkarpeta
Well it might be overkill
but it´sounds like its not really connected but
without actual errors then its not possible to guess at all.
Could be a driver issue or trust issue.
You should use other tools to try to test if they are really paired.

kuzulis

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