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How to install

Work in progress: python package, setup.py

Currently refactoring to implement proper Python packaging.

Install the tool along with dependencies (python-can) with: python setup.py install.

You still need to configure your CAN interface per the instructions below.

Package installation tested on:

  • Python 3.10
  • Python 3.6 - 3.9
  • Python 2.7

Linux

The setup consists of two steps. First we need to get the USB-to-Can device working and secondly configure Python-Can for the device.

USB-to-Can Setup

  1. Install a reasonably modern Linux dist (with a kernel >= 3.4) e.g. latest Ubuntu. Tested with Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 17.04.

  2. Plug in the USB-to-Can device (we use PEAK PCAN-USB)

  3. Load the CAN module (needs to be done after each reboot):

    sudo modprobe can

  4. Set up the can device (needs to be done after each reboot).

    sudo ip link set can0 up type can bitrate 500000

    Note: The bit rate may differ between different CAN buses.

  5. can0 will now display as a normal network interface

Python-Can

Tested with python-can 1.5.2 and 2.0.0a2.

  1. Install pip (package management system for python - often installed by default)

  2. Install python-can by running:

     pip install python-can

  3. Verify that the installation worked by running python from the terminal and load the can module.

    $ python
Python 2.7.13 (default, Jan 19 2017, 14:48:08) 
[GCC 6.3.0 20170118] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import can
>>>
Configure

Python-Can uses a configuration file ~/.canrc to specify a CAN interface. The contents of this file might e.g. be:

[default]
interface = socketcan
channel = can0
Test it

Run the following command:

cc.py dump

If packets are received, everything is good to go!

Windows 7

The simplest solution is to download VMware Player , install a Linux distribution and to follow the Linux guide above.

Raspberry Pi

Parts list

  • Raspberry Pi model B
  • SD-card 8 GB
  • piCAN-shield
  • DBUS 9 male
  • 2 wires

NOTE! The install procedure was more complex earlier - if you are using an older Raspbian, try looking into older versions of this howto. Regarding HW, this blogpost details a couple of interesting alternatives

USB-to-CAN

Raspbian
  1. Download and flash latest raspbian image to SD card. We used http://downloads.raspberrypi.org/raspbian/images/raspbian-2017-07-05/
  2. Update, upgrade & reboot
sudo apt-get update
sudo apt-get upgrade
sudo reboot
Kernel modules
  1. Enable kernel module for spi by;
    1. either using the Raspberry Pi Configuraton tool, available from the Raspbian desktop
    2. or editing /boot/config.txt and adding dtparam=spi=on
  2. Enable kernel module for the mcp2515 chipset (CAN controller) on piCAN by adding dtoverlay=mcp2515-can0,oscillator=16000000,interrupt=25 to /boot/config.txt
  3. Add dtoverlay=spi-bcm2835-overlay to /boot/config.txt, because everyone says it's the right thing to do
sudo reboot
Bring up the interface

Configure CAN interface and bring it up sudo ip link set can0 up type can bitrate 500000

Python-Can

See instructions above in the Linux guide