Using SystecCAN Backend

The SystecCAN backend encapsulates the low-level API to work with the SYS TEC CAN adapters.

Creating CAN Bus Devices

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

  if (QCanBus::instance()->plugins().contains(QStringLiteral("systeccan"))) {
      // backend available
  }

Where systeccan is the backend name.

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

  QCanBusDevice *device = QCanBus::instance()->createDevice(
      QStringLiteral("systeccan"), QStringLiteral("can0.0"));
  device->connectDevice();

Where, can0.0 is the active CAN interface name (interface 0, channel 0). The SystecCAN backend supports 64 USB interfaces (so called modules) from can0.0 to can63.1. Each module can have one or two channels, they can be accessed by the index canX.0 or canX.1.

Note: SYS TEC also provides 8 or 16 channel CAN interfaces. These units consist of an USB hub and multiple two-channel modules internally.

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 at least one new frame is available for reading:

  QCanBusFrame frame = device->readFrame();

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