Jason Gaunt
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 ;)
Diff: GMLAN.cpp
- Revision:
- 0:9266fbfbef88
- Child:
- 3:09fdfec053cd
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/GMLAN.cpp Tue Feb 19 17:12:53 2013 +0000
@@ -0,0 +1,33 @@
+/*
+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;
+}
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