Jason Gaunt / Mbed 2 deprecated GMLAN-Sniffer

A working demonstration on how to read GMLAN packets using an mbed and a compatible CAN transceiver such as (and tested with) the CAN-Bus demo board. The SparkFun CAN Shield should also work perfectly too, as should just about every MCP2551-based solution (but this code should be portable to other transceivers). Please note to get this to work, you must tie CAN_L to ground and connect CAN_H to the single wire CAN.

Dependencies:   mbed

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Table of Contents

  1. GMLAN Sniffer
  2. Introduction

GMLAN Sniffer

Introduction

This project makes use of CAN on an LPC1768 to communicate with General Motors GMLAN network via a compatible transceiver. GMLAN is a single wire CAN Bus that operates at 33.333 kbit with 29-bit header packets and is commonly used for transmission of non-critical information between such nodes on automobiles as the following;

  • Dash cluster
  • Entertainment system (head unit)
  • Satellite Navigation (OnStar for example)
  • HVAC controls
  • Immobiliser / alarm / other security systems
  • Door locks and door status
  • Power Windows
  • Interior / exterior lighting
  • Reversing sensors

The list is extensive, for a better idea of what can be done, view the ARBIDs tab on the GMLAN Bible Google Docs spreadsheet (tabs are at the bottom of the page).

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