LOAD_DBC

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Load a DBC file. Open and parse a given database file. The database format is inferred from the file extension. This block is compatible with the following database format. `dbc`, `arxml`, `kcd`, `sym`, `cdd`. Params: file_path : File The path to the DBC file. Returns: Stateful : cantools.database.Database Return a cantools database object.

Python Code

from flojoy import flojoy, File, Stateful, DataContainer
from typing import Optional
from cantools import database


@flojoy(deps={"python-can": "4.3.1", "cantools": "39.4.2"})
def LOAD_DBC(file_path: File, default: Optional[DataContainer] = None) -> Stateful:
    """Load a DBC file.

    Open and parse a given database file. The database format is inferred from the file extension.
    This block is compatible with the following database format. `dbc`, `arxml`, `kcd`, `sym`, `cdd`.

    Parameters
    ----------
    file_path : File
        The path to the DBC file.

    Returns
    -------
    Stateful : cantools.database.Database
        Return a cantools database object.
    """

    db = database.load_file(file_path.unwrap())

    return Stateful(db)

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Example App

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Download this Flojoy App

This application demonstrates how to use multiple CAN blocks to connect to a PEAK-USB device and read messages from it. The PEAK-USB device is a USB-to-CAN interface that enables you to connect a computer to a CAN network. This device is used in this case to capture the messages of a particular sensor by filtering them directly at the kernel level, thus reducing the load on the CPU, and save those messages to a log file locally.

Once the app is done, the generated logs are exported to an S3 bucket to keep a record of the sensor’s data for further analysis.

To replicate this application, you must connect the PEAK-USB to your computer and install the required driver (refer to the PEAK_CONNECT blocks for more information on the necessary driver for your platform). Then, simply specify the PEAK-USB channel in the required blocks, and this Flojoy application will log the messages received by the device!

Detecting channels A valuable block is the PEAK_DETECT_AVAILABLE_DEVICE. This block allows you to display the devices using the PCAN interface that are connected to your computer.