Jason Gaunt / GMLAN

Libraries to support working with GMLAN - General Motors CAN BUS network in most of their vehicles between 2007-present day. Please note this is a work in progress and not guaranteed to be correct, use at your own risk! Read commit logs / subscribe to see what has been added, it's a work in progress after all ;)

GMLAN.cpp

Committer:
foxdie
Date:
2013-02-19
Revision:
0:9266fbfbef88
Child:
3:09fdfec053cd

File content as of revision 0:9266fbfbef88:

/*
GMLAN.cpp - Source file for GMLAN Library

GMLAN is a Controller Area Network Bus used in General Motors vehicles from
roughly 2007-onwards. Its purpose is to allow various Electronic Control Units
(aka ECUs) within a modern vehicle to share information and enact procedures.

An example of this would be communication between the HU (Head unit) and the
DIC (Dashboard Information Cluster), when you adjust the volume up / down, this
is reported to the cluster to be displayed.

It is the function of this library to "crack open" this world to allow anyone
with only as little as a few hours of C++ programming under their belt to get
started in what can sometimes seem a daunting world.

Jason Gaunt, 18th Feb 2013
*/

#include "GMLAN.h"

void CANHeader::decode(int _header) {
    priorityID = (_header >> 26) & 0x7;
    arbitrationID = (_header >> 13) & 0x1FFF;
    senderID = (_header >> 0)  & 0x1FFF;
}
int CANHeader::encode(void) {
    long int buffer = 0;
    buffer = (buffer << 3) | 0x0; // 3 bit padding
    buffer = (buffer << 3) | priorityID;
    buffer = (buffer << 13) | arbitrationID;
    buffer = (buffer << 13) | senderID;
    return buffer;
}