python-can

The python-can library provides Controller Area Network support for Python, providing common abstractions to different hardware devices, and a suite of utilities for sending and receiving messages on a CAN bus.

python-can runs any where Python runs; from high powered computers with commercial CAN to usb devices right down to low powered devices running linux such as a BeagleBone or RaspberryPi.

More concretely, some example uses of the library:

  • Passively logging what occurs on a CAN bus. For example monitoring a commercial vehicle using its OBD-II port.
  • Testing of hardware that interacts via CAN. Modules found in modern cars, motocycles, boats, and even wheelchairs have had components tested from Python using this library.
  • Prototyping new hardware modules or software algorithms in-the-loop. Easily interact with an existing bus.
  • Creating virtual modules to prototype CAN bus communication.

Brief example of the library in action: connecting to a CAN bus, creating and sending a message:

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
#!/usr/bin/env python
# coding: utf-8

"""
This example shows how sending a single message works.
"""

from __future__ import print_function

import can

def send_one():

    # this uses the default configuration (for example from the config file)
    # see https://python-can.readthedocs.io/en/stable/configuration.html
    bus = can.interface.Bus()

    # Using specific buses works similar:
    # bus = can.interface.Bus(bustype='socketcan', channel='vcan0', bitrate=250000)
    # bus = can.interface.Bus(bustype='pcan', channel='PCAN_USBBUS1', bitrate=250000)
    # bus = can.interface.Bus(bustype='ixxat', channel=0, bitrate=250000)
    # bus = can.interface.Bus(bustype='vector', app_name='CANalyzer', channel=0, bitrate=250000)
    # ...

    msg = can.Message(arbitration_id=0xc0ffee,
                      data=[0, 25, 0, 1, 3, 1, 4, 1],
                      is_extended_id=True)

    try:
        bus.send(msg)
        print("Message sent on {}".format(bus.channel_info))
    except can.CanError:
        print("Message NOT sent")

if __name__ == '__main__':
    send_one()

Contents:

Known Bugs

See the project bug tracker on github. Patches and pull requests very welcome!

Documentation generated

Aug 17, 2019