transceiver mode FCS check

Dan-o

Other Parts Discussed in Thread: CC31XXEMUBOOST

In transceiver receive mode is there an FCS check or do we receive all packets regardless of FCS being correct?

Is this different for SL_SOCK_RAW vs SL_SOCK_DGRAM? i.e. does an L1 or L2 socket throw away frames with invalid FCS in transciever mode?

over 9 years ago

0 Ankur Baranwal over 9 years ago

TI__Mastermind 26205 points

Hi Dan,

FCC packets are filtered and discarded by the hardware, we only maintain a counter for the number of FCC errors.

Regards,
Ankur

Edit: removing link and adding original response.

0 Dan-o over 9 years ago in reply to Ankur Baranwal

Intellectual 895 points

I get Access Denied from that link -

"Access Denied You do not have permission to view/download this item. "

0 Ankur Baranwal over 9 years ago in reply to Dan-o

TI__Mastermind 26205 points

Hi Dan,

I have edited my original post.

Regards,
Ankur

0 Dan-o over 9 years ago in reply to Ankur Baranwal

Intellectual 895 points

I don't believe the hardware drops packets according to the testing I have done today. I have 2 CC31XXEMUBOOST , 1 is running transceiver_mode example, and the the other is running sniffer_with_filters example.

transceiver_mode board has MAC of 00:00:00:00:00:01, is sending out probe requests buffers, with the last 4 bytes set to random numbers.

sniffer_with_filters board: filter set up to discard everything that is not from MAC 00:00:00:00:00:01

I see all the packets from the transceiver board on the sniffer board. The received buffer contains all the data from the probe request, but the FCS bytes are all 0x00.

Why did you indicate the hardware drops packets with incorrect FCS? Am I doing something wrong here?

0 Nuno Romao over 9 years ago in reply to Dan-o

Prodigy 200 points

That's because the NWP calculates the FCS and sets it in the frame before a frame is sent out and the random bytes you added are not the FCS that goes out over the air.

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transceiver mode FCS check