CAN rx filter mask

jma_1 · Joined: 08 Feb 2005 Posts: 147 Location: Wisconsin

Greetings,

I thought I would point this out in case anyone has made the same blunder I did.

The argument 'CAN_MASK_ACCEPT_ALL' in the can_set_id() function is the value zero. Per the data sheet on PIC's w/ CAN, this means that all messages will be received and you cannot associate a filter with a buffer. I spent quite a bit of time verifying this due to my inability to read the data sheet. :-)

Cheers,
JMA

sjbaxter · Joined: 26 Jan 2006 Posts: 141 Location: Cheshire, UK

jma_1,

This is a good point. I have been meaning to write a simple VB or c# app that you can enter a list of ID's that you want to recieve and then get it to give you the MASK and/or specific FILTERs that you need to set. Maybe that'll give me something to do this weekend Very Happy

If you leave it as accept all, and you have a fairly active bus, the PIC soon becomes unresponsive as it tries to service all the RX interrupts.
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Regards,
Simon.