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Re: [Discuss-gnuradio] synchronization throughout flowgraph


From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] synchronization throughout flowgraph
Date: Mon, 9 Mar 2009 09:18:11 -0400

On Sun, Mar 8, 2009 at 8:20 PM, Vincenzo Pellegrini <address@hidden> wrote:
> Hi everybody,
> just a very simple question:
> is there a clean way in GNURadio to do this
>
> source-->block1-->block2
>
> where:
> source sends let's say some gr_complex
> block 1 looks for some synchro signal within the flow
>
> block2 does absolutely nothing (i.e. does not process zeors or anything,
> simply it is frozen) untill block1 says: "well your frame starts here" and
> delivers a vector for block 2 to work upon.
>
> It would be great if any body who's been doing this sort of things could
> provide some pointer to start from.
>
> thank you all
>
> vincenzo
>
> PS.
> If this is not a sane way to arrange a flowgraph for doing syncronization,
> please point me to the sane way... ;-)
> Maybe I should only use stream-oriented blocks that decide what to do and
> when, just based on some block internal state?

Look at the OFDM code. We did something similar where the data went
out port 0 and a flag signal out of port 1. The other guys down the
line would not do anything until they saw the flag signal go high.

Tom




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