https://github.com/blueandi/beaglebone_black_socketcan

How to get access to the CAN bus on a BeagleBone Black via socketcan interface.
https://github.com/blueandi/beaglebone_black_socketcan

beaglebone-black can-bus howto howto-tutorial socketcan

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How to get access to the CAN bus on a BeagleBone Black via socketcan interface.

• Host: GitHub
• URL: https://github.com/blueandi/beaglebone_black_socketcan
• Owner: BlueAndi
• License: other
• Created: 2018-03-14T13:51:12.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-03-19T22:53:13.000Z (over 6 years ago)
• Last Synced: 2024-10-06T12:04:54.826Z (about 1 month ago)
• Topics: beaglebone-black, can-bus, howto, howto-tutorial, socketcan
• Size: 1.95 KB
• Stars: 5
• Watchers: 5
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE.txt

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# BeagleBone Black CAN bus communication via socketcan

This tutorial is based on a Debian Stretch distribution from 2017-12-12 on the Beaglebone Black. The description is independent of the used CAN cape.

I used this CAN cape: [BeagleBone Serial Cape from Logic Supply](http://www.logicsupply.com/de-de/cbb-serial)

## Setup Debian image

* Download latest BeagleBone Black image from [BeagleBone Images](https://beagleboard.org/latest-images), e.g. the Debian Stretch IoT (non-GUI).

* Following the [software update guide](https://beagleboard.org/getting-started#update).

  * For short: Program image to the sd card by using a sd card programming utility.

  * Hold the user/reset button pressed, while powering the board.

* Connect to the BeagleBone Black via ssh.

  * hostname: **beaglebone**

  * user: **debian**

  * password: **temppwd**

* Next important step is to change the password via ```passwd```.

* Update the packages: ```sudo apt-get update```

* Upgrade the distribution: ```sudo apt-get upgrade```

## SocketCAN drivers

The BeagleBone should already have the SocketCAN drivers installed, so to use the CAN bus you just need to set the bitrate 125 kBit/s and bring up the CAN0 interface with:

```

sudo ip link set can0 up type can bitrate 125000

ifconfig

```

You should see now the can0 interface, similar as shown in the following example.

```

can0: flags=193  mtu 16

        unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 10  (UNSPEC)

        RX packets 0  bytes 0 (0.0 B)

        RX errors 0  dropped 0  overruns 0  frame 0

        TX packets 0  bytes 0 (0.0 B)

        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

        device interrupt 166

```

## CAN utilities

if ```candump``` is not available, it looks like the CAN utilities are not installed. In this case follow the instructions, otherwise just skip this chapter.

* ```git clone https://github.com/linux-can/can-utils```

* ```cd can-utils```

* ```apt-get install automake```

* ```./autogen.sh```

* ```./configure```

* ```make```

* ```make install```

## Network interface

* Update the network interface for CAN, to start it automatically during startup: ```sudo nano /etc/network/interfaces```

* Add the following at the end:

```

allow-hotplug can0

iface can0 can static

    bitrate 125000

```

## Test

To test whether its working or not, lets dump all CAN messages to the console: ```candump can0```

Abort it with strg + c.