SetGroupFilters

NETMF & Gadgeteer
1

I have tried to use the SetGroupFilters method with CAN but dont get it working.

If I set range 0x700 to 0x7FF I still get messages outside this range.

Does anyone have a working code example?

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2

Could you post some sample code of what you are doing?

3

I’m interested in this as well… Does the “group” refer to part of the ArbID. I’m trying to work with NMEA 2000 which is based on J1939. I couldn’t get the group filters to work, so I have to look at every message, decode it, and decided if I should do something with it… getting this to work would make a big difference in performance.

4

Yes you should always use filters if you can

5

I just found an application note on the NXP website that may help…
Here is the link… http://www.nxp.com/documents/application_note/AN10438.pdf

I have to say that even when I’m looking at every packet, things seem to work well, except when I doing a lot of debugging output (debug.print).Things get a little sluggish when GC kicks in…
Here is another useful link: http://www.nxp.com/documents/application_note/AN10674.pdf

6 

_canHandle.SetExplicitFilters(new uint[]{0x728});

But I still get interrupts for ArbID 0x727…

Also wonder if the array should contain ArbID or something else??

7

I now found the source of the problem.

If I call the DisableExplicitFilters after I have set filters with SetExplicitFilters I cant set new filters again.

Is there any way to Enable the filters again? I have tried to set the filters again but this doesn’t help.

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8

Did you ever find a solution to your problem?

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