Difference between revisions of "CAN Bus"

From eLinux.org
Jump to: navigation, search
(Overview: added Link to CiA)
(CAN Support in Linux: added can4linux)
Line 21: Line 21:
 
=== CAN Support in Linux ===
 
=== CAN Support in Linux ===
  
The Linux kernel supports CAN with the SocketCAN framework.
+
CAN is supported by Linux device drivers. Mainly two types exist. Character device based drivers and network socket based drivers. The Linux kernel supports CAN with the SocketCAN framework.
  
 
* [http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/networking/can.txt SocketCAN Documentation]
 
* [http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=blob_plain;f=Documentation/networking/can.txt SocketCAN Documentation]
Line 27: Line 27:
 
* [http://gitorious.org/linux-can linux-can git repository]
 
* [http://gitorious.org/linux-can linux-can git repository]
 
* [http://developer.berlios.de/projects/socketcan/ Berlios Project Page (obsolete)]
 
* [http://developer.berlios.de/projects/socketcan/ Berlios Project Page (obsolete)]
 +
 +
One of the character based drivers is can4linux.
 +
 +
* [http://sourceforge.net/projects/can4linux/ SourceForge project page]
 +
* [http://de.wikipedia.org/wiki/Can4linux German Wikipedia article]
 +
* [http://en.wikipedia.org/wiki/Can4linux English Wikipedia article]
  
 
=== SocketCAN Supported Protocols ===
 
=== SocketCAN Supported Protocols ===

Revision as of 17:21, 14 May 2013

Overview

The CAN bus is an ISO standard bus originally developed for vehicles. It manages the Chassis Electrical System Control and is responsible for critical activities like engine electrical, and skid control. This system is also used to provide vehicle diagnostic information for maintenance. A multi-star configuration seems typical of this bus with a primary bus line that branches into sub bus lines at its extremities then attaches to multiple device nodes. Differential voltage is applied over twisted pair at 1.5 to 2.5V and 2.5 to 3.5V for noise resistant signaling. Bit rates up to 1 Mbit/s are possible at network lengths below 40 m. Decreasing the bit rate allows longer network distances (e.g., 500 m at 125 kbit/s).

(Jeremiah J. Flerchinger Source)

additional information can be found at:

http://en.wikipedia.org/wiki/CAN_bus

SocketCAN News

CiA CAN in Automation CAN user association

CAN Support in Linux

CAN is supported by Linux device drivers. Mainly two types exist. Character device based drivers and network socket based drivers. The Linux kernel supports CAN with the SocketCAN framework.

One of the character based drivers is can4linux.

SocketCAN Supported Protocols

  • RAW: send & receive raw CAN frames
  • BCM: Broadcast manager, offload repetitive work to the Linux kernel
  • ISOTP ...
  • SAE J1939

SocketCAN Supported Controllers

  • Microchip MCP251x
  • Atmel AT91 SoCs
  • ESD 331 CAN Cards
  • Philips SJA1000
  • Freescale MPC52xx SoCs
  • Bosch CC770
  • Intel AN82527
  • TIs SoCs
  • Serial/network devices utilizing ASCII protocol (slcan driver)


SocketCAN Support in Programming Languages/Environments