QCanbus - Peak driver - Unable to read data from CANbus

TMJJ001

Dear,

I have some very basic code where I just want to see a qDebug message when I receive a message on the Canbus.
I'm using the Peak CAN-USB adapter and QCanbus.

For some reason the "&QCanBusDevice::framesReceived" is not triggered. First I thought it would be a .dll issue or driver issue.
When I use the SAVVYCAN source code (https://github.com/collin80/SavvyCAN) I do receive the data. So it seems like I'm just doing something wrong in the code.


void Canbus::setupDevice()
{
    qDebug() << "connectCanDevice";
    //Check if Peakcan plugin is available
    if (QCanBus::instance()->plugins().contains(QStringLiteral("peakcan"))) {
        qDebug() << "Peakcan plugin is existing";
    }

    QString errorString;
    device = QCanBus::instance()->createDevice(
        QStringLiteral("peakcan"), QStringLiteral("usb0"), &errorString);
    if (!device) {
        // Error handling goes here
        qDebug() << errorString;
    } else {
        qDebug() << "Device is Ready";
        setBitrate();
    }
}

void Canbus::setBitrate()
{
    qDebug() << "Set bitrate";
    device->setConfigurationParameter(QCanBusDevice::BitRateKey,250000);
    connectCanDevice();
}

void Canbus::connectCanDevice()
{

    connect(device,&QCanBusDevice::framesReceived,this,&Canbus::dataReceived);
    connect(device,&QCanBusDevice::errorOccurred, this,&Canbus::processErrors);
    qDebug() << "connect the device";
    device->connectDevice();


}

void Canbus::dataReceived()
{
    qDebug()<< "data received";
}

void Canbus::processErrors(QCanBusDevice::CanBusError error)
{
    switch (error) {
    case QCanBusDevice::ReadError:
    case QCanBusDevice::WriteError:
    case QCanBusDevice::ConnectionError:
    case QCanBusDevice::ConfigurationError:
    case QCanBusDevice::UnknownError:
        qDebug() << "ERROR:" + device->errorString();
        break;
    default:
        break;
    }
}

Anybody an idea what the reason could be?
I'm using Qt5.15.2.

Thanks in advance,
Kind regards,
Toon

jsulm

@TMJJ001 said in QCanbus - Peak driver - Unable to read data from CANbus:

device->connectDevice();

What does it return?

SPlatten

@TMJJ001 , are you sure the baud rate is correct? There are several settings you need to ensure are correct, like data bits, stop bits, baud and parity.

TMJJ001

@jsulm

Yes, it returns true. So the device is connected. The SIGNAL "&QCanBusDevice::framesReceived" is not transmitted.

Thanks!

TMJJ001

@SPlatten

Yes baudrate is correct, I'm sending with another computer and PCanview data on the bus.
The parameters databits, stop bits and parity, isn't this only for serial communication?

SPlatten

@TMJJ001 , depends on the network medium, like other protocols, CANbus is a protocol that can be used on multi-drop serial connections like RS422 and RS485, in both these cases then the serial parameters are relevant.