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The CAN bus is an ISO standard bus 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. Communication occurs at 500 kbps with 1-8 Bytes of data inside of each transmitted packet.

(Jeremiah J. Flerchinger Source)

CAN Support in Linux

The Linux kernel supports CAN with the SocketCAN framework.

Supported Controllers

  • Microchip MCP251x
  • Atmel AT91 SoCs
  • ESD 331 CAN Cards
  • Philips SJA1000
  • Freescale MPC52xx SoCs
  • Bosch CC770
  • Intel AN82527