New MCP2515 CAN Library Available

Forum 2005-2010 (read only) General Exhibition
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Last month I bought a CAN shield from Sparkfun in order to display gas mileage statistics in realtime for my OBD2-compatible car. I could not find a CAN library the did what I needed written in English, so I decided to write my own from scratch. I thought I would share it, in case it might be useful to anyone else.

The library has the following functions:
static boolean initCAN(int baudConst);
static boolean setCANNormalMode();
static boolean setCANReceiveonlyMode();
static boolean receiveCANMessage(CANMSG *msg, unsigned long timeout);
static boolean transmitCANMessage(CANMSG msg, unsigned long timeout);
static byte getCANTxErrCnt();
static byte getCANRxErrCnt();
static long queryOBD(byte code);

It includes a tested example to display miles per gallon on an LCD display (I have been using this in my car for the past several weeks).

Frank

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I offered my MCP2515 library to Sparkfun, but they never posted it.

Mines strictly CAN though, no OBDII. Going to take a peek at yours to see what you've done on the OBDII side.

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Cool franksmicro!!

I´ve been tinkering with CAN bus for a while.....

http://real2electronics.blogspot.com/2010/06/can-bus-mcp2515.html

I´m sorry,it´s in spanish. It´s not a proper library, it´s an explanation how to use MCP2515 and the basic functions needed.
I´ve some links to code and hardware.... I´ve just added a link to your library!

DaveAK, if you also have a library, please let me know the link and I could add. There are no many projects with CAN bus and Arduino.

I did this...

:wink:

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Igor, I like your LCD display! Bet its expensive though. I have the Sparkfun Nokia knockoff as well, but it is too small to display multiple parameters at a time so have not used it with OBD.

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Hi,
I've used a NewHaven Display => www.newhavendisplay.com/
It's very big and cool!!!! ;D I don't remember, but something less 70 dollars.
I've choosen one based on T6963 controller. I bought directly from this web.

It's very cool!!

Regards,

:wink:

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Igor, I don't have my code posted any where yet. I'll see about getting it up on google code or something like that.

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DaveAK, I'd be interested in your code too, I'm working on an CAN Arduino project and some code would be beneficial.

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So as not to hijack Frank's thread, I've posted my code over on the thread I started a few weeks back:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1289195675

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