CAN bus

I've been asked to write some software for a 16f877. Basically it has to look at canbus commands coming out of an MCP2515 and produce a byte output to a DAC which will provide a 0 to 10V DC signal.
It all sounds pretty simple except that I have no idea how CAN works and I only have a week to understand it. Does anyone know of a quick CAN primer on the web?

may these links help you

http://www.interfacebus.com/Design_Connector_CAN.html

http://sine.ni.com/apps/we/nioc.vp?cid=1329&lang=US

good luck!

Thanks Steve.
Mind you, looking at the first link I'm beginning to wonder whether I can be bothered. It all looks pretty complicated.

Well, it will always look complicated since you'll understand it. i've never use this CAN bus at this point. I found other link here

http://www.canopen.us/

maybe some other have better/simple explanation for this bus??

regards