Using PeakCAN Backend

The PeakCAN backend encapsulates the low-level API to work with the PEAK-System CAN adapters.

Creating CAN Bus Devices

At first it is necessary to check that QCanBus provides the desired backend:

foreach (const QByteArray &backend, QCanBus::instance()->plugins()) {
    if (backend == "peakcan") {
        // were found
        break;
    }
}

Where peakcan is the backend name.

Next, a connection to a specific interface can be established:

QCanBusDevice *device = QCanBus::instance()->createDevice("peakcan", QStringLiteral("usbbus1"));
device->connectDevice();

Where usbbus1 is the active CAN interface name. The PeakCAN backend supports eight USB interfaces from usbbus1 to usbbus8 and eight PCI interfaces from pcibus1 to pcibus8.

Note: Only the USB and PCI adapters are currently supported by this backend.

The device is now open for writing and reading CAN frames:

QCanBusFrame frame;
frame.setFrameId(8);
QByteArray payload("A36E");
frame.setPayload(payload);
device->writeFrame(frame);

The reading can be done using the readFrame() method. The framesReceived() signal is emitted when a new frame is available for reading:

QCanBusFrame frame = device->readFrame();

PeakCAN supports the following configurations that can be controlled through setConfigurationParameter():

Configuration parameter keyDescription
QCanBusDevice::BitRateKeyDetermines the bit rate of the CAN bus connection. The following bit rates are supported: 5000, 10000, 20000, 33000, 47000, 50000, 83000, 95000, 100000, 125000, 250000, 500000, 800000, 1000000. Note that this configuration parameter can only be adjusted while the QCanBusDevice is not connected.

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