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Re: [Discuss-gnuradio] USRP2 PPS and REF

From: Douglas Geiger
Subject: Re: [Discuss-gnuradio] USRP2 PPS and REF
Date: Thu, 12 Feb 2009 11:54:50 -0600
User-agent: Thunderbird (Windows/20081209)

Johnathan Corgan wrote:
> On Tue, Feb 10, 2009 at 1:26 PM, Douglas Geiger
> <address@hidden> wrote:
>> Ok, looking at the frames in wireshark, looking for the timestamps that
>> were sent to the copy handler, it looks like only the frames from 30:80
>> are being used, and they're being used twice (i.e. u2b->rx_samples(0,
>> handlerb.get()) got the same samples that u2a->rx_samples(0,
>> handlera.get()) got).
> Thanks for the info and update, this really helps narrow it down.  We
> may have a bug in our GbE driver packet filter, where the source mac
> address is being set to the wrong USRP2.  Unfortunately, both Eric and
> I are out of the office at the moment, but we'll look at this tonight.

In an effort to try to help solve this:
 The packet filter (the used in make_ethertype_inbound at least) looks
like it just sorts filters in packets with the correct ethertype, and
filters out any of those from 'our' (i.e. the host PC) mac address.
Unless I'm not following the code correctly - is there somewhere else
which looks for the target USRP2's mac address in receive packets?

Doug Geiger
Research Assistant
Communications and Signal Processing Lab
Oklahoma State University

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