Signal/Frame Conversion Example

This example uses nixnet.convert.SignalConversionSinglePointSession to take signal values from the user, converts them to frames, and converts them back.

To adapt this example to LIN frames, reference signals in a database that use LIN:

convert_frames_to_signals:

Accepts any frame type.

convert_signals_to_frames:

Chooses the frame object to create based on the frame_type field in the raw data. This can be overridden by passing a custom nixnet.types.FrameFactory in the frame_type parameter.

def main():
    database_name = 'NIXNET_example'
    cluster_name = 'CAN_Cluster'
    signal_names = ['CANEventSignal1', 'CANEventSignal2']

    with convert.SignalConversionSinglePointSession(
            database_name,
            cluster_name,
            signal_names) as session:

        user_value = six.moves.input('Enter {} signal values [float, float]: '.format(len(signal_names)))
        try:
            expected_signals = [float(x.strip()) for x in user_value.split(",")]
        except ValueError:
            expected_signals = [24.5343, 77.0129]
            print('Unrecognized input ({}). Setting data buffer to {}'.format(user_value, expected_signals))

        if len(expected_signals) != len(signal_names):
            expected_signals = [24.5343, 77.0129]
            print('Invalid number of signal values entered. Setting data buffer to {}'.format(expected_signals))

        frames = session.convert_signals_to_frames(expected_signals)
        print('Frames:')
        for frame in frames:
            print('    {}'.format(frame))
            print('        payload={}'.format(list(six.iterbytes(frame.payload))))

        converted_signals = session.convert_frames_to_signals(frames)
        print('Signals: {}'.format([v for (_, v) in converted_signals]))