CAN filtering

How does one define the filter for a CAN A message, when the ID is only 11 bits?

If using 16-bit filter, what should be put to the EXTID[17:15]?

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Best answer by Tesla DeLorean

>>What do the EXTID-bits match to?

Whatever you have on the wire, it is a one-to-one deal, not magic. If it's random crap you're going to need to mask it...

Guru

Match = (ID << 5)

Mask = 0x7FF << 5;

Let me go find the diagram, I've posted it a bunch of times to older iteration of the forum...

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Guru

For the identifier list expect you're going to have to exactly match the bit patterns you've enumerated.

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Senior III

Just that CAN A does not have EXTID. CAN A ID is only 11 bits.

What do the EXTID-bits match to?

Or maybe one needs to use masking with CAN A?

Guru

>>What do the EXTID-bits match to?

Whatever you have on the wire, it is a one-to-one deal, not magic. If it's random crap you're going to need to mask it...

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Senior III

As I thought. Thanks for confirmation.

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