CANABLE_CONNECT

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Connect to a slcan-compatible USB-to-CAN adapter. Params: device : SerialDevice The serial device to connect to. CAN_address : str The `CAN_address` to use in other blocks to refer to this connection. Note: This is not the physical address of the device, but rather a unique identifier for the connection. Needed since not all CAN bus connection can be retreive with a SerialDevice. bitrate : int The bitrate to use for the CAN bus. Returns: out : Optional[DataContainer] None

Python Code

from flojoy import (
    DataContainer,
    SerialDevice,
    flojoy,
    DeviceConnectionManager,
    HardwareDevice,
)
from typing import Optional
import can


@flojoy(deps={"python-can": "4.3.1"})
def CANABLE_CONNECT(
    device: SerialDevice,
    CAN_address: str,
    bitrate: int = 500000,
    default: Optional[DataContainer] = None,
) -> Optional[DataContainer]:
    """Connect to a slcan-compatible USB-to-CAN adapter.

    Parameters
    ----------
    device : SerialDevice
        The serial device to connect to.
    CAN_address : str
        The `CAN_address` to use in other blocks to refer to this connection.
        Note: This is not the physical address of the device, but rather a unique identifier for the connection. Needed since not all CAN bus connection can be retreive with a SerialDevice.
    bitrate : int
        The bitrate to use for the CAN bus.

    Returns
    -------
    Optional[DataContainer]
        None
    """

    session = can.interface.Bus(
        interface="slcan", channel=device.get_port(), bitrate=bitrate
    )

    DeviceConnectionManager.register_connection(
        HardwareDevice(CAN_address), session, lambda slcan_bus: slcan_bus.shutdown()
    )

    return None

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Example App

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This example shows how to send a frame to a CAN bus using the CANable USB-to-CAN adapter. The application sends a first frame intended to indicate the start of a test on a system. Subsequently, the application sends a burst of messages and then sends a frame to indicate the end of the test.

This application uses an CANABLE_CONNECT block to establish a connection to the CAN bus, but this connection could be replaced by any other connection. For example, the PEAK_CONNECT block could be used instead.