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Re: [Discuss-gnuradio] USRP2 PPS and REF

From: Johnathan Corgan
Subject: Re: [Discuss-gnuradio] USRP2 PPS and REF
Date: Tue, 10 Feb 2009 14:09:32 -0800

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.

> Is sync_to_pps() supposed to reliably return false
> if the FPGA did not find a signal to sync to?

Unrelated to the above.  The 'true' return from the call only means
that the command was successfully received by the USRP2 and processed,
not that the sync succeeded.


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