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:
- 2013-03-19
- Revision:
- 5:d0b067be6d44
- Parent:
- 4:486fec88517e
- Child:
- 6:32592425aa57
File content as of revision 5:d0b067be6d44:
/* 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 "mbed.h" #include "GMLAN.h" #include <vector> void CANHeader::decode(int _header) { if (_header < 0x800) { // 11-bit header arbitrationID = (_header >> 0) & 0x7FF; } else { // 29-bit header priorityID = (_header >> 26) & 0x7; arbitrationID = (_header >> 13) & 0x1FFF; senderID = (_header >> 0) & 0x1FFF; } } int CANHeader::encode29bit(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; } int CANHeader::encode11bit(void) { short int buffer = 0; buffer = (buffer << 5) | 0x0; // 5 bit padding buffer = (buffer << 11) | arbitrationID; return buffer; } GMLAN_Message::GMLAN_Message(int _priority, int _arbitration, int _sender, int _b0, int _b1, int _b2, int _b3, int _b4, int _b5, int _b6, int _b7) { priority = _priority; arbitration = _arbitration; sender = _sender; if (_b0 != -1) data.push_back(_b0); if (_b1 != -1) data.push_back(_b1); if (_b2 != -1) data.push_back(_b2); if (_b3 != -1) data.push_back(_b3); if (_b4 != -1) data.push_back(_b4); if (_b5 != -1) data.push_back(_b5); if (_b6 != -1) data.push_back(_b6); if (_b7 != -1) data.push_back(_b7); } CANMessage GMLAN_Message::generate(void) { CANHeader hdr; hdr.priority(priority); hdr.arbitration(arbitration); hdr.sender(sender); char datatochars [data.size()]; for (int i = 0; i < data.size(); i++) datatochars[i] = data[i]; if (sender > 0x0) return CANMessage(hdr.encode29bit(), datatochars, data.size(), CANData, CANExtended); else return CANMessage(arbitration, datatochars, data.size(), CANData, CANStandard); }