Re: [Discuss-gnuradio] timestamps inband

On Tue, Jul 28, 2009 at 10:25:40AM -0700, George Nychis wrote:
> On Mon, Jul 27, 2009 at 7:06 AM, Johnathan Corgan <
> jcorgan@xxxxxxxxxxxxxxxxxxxxx> wrote:
> 
> > On Mon, Jul 27, 2009 at 06:28, Dimitris Symeonidis<azimout@xxxxxxxxx>
> > wrote:
> >
> > > Do we even need timestamps, or are the samples aligned (interleaved)
> > > anyway, even with the standard FPGA image? We don't care about
> > > absolute time, just time (phase) difference between the two channels.
> >
> > With the standard image, if you've set the mux and number of channels
> > appropriately, then the interleaved channels are coherently sampled
> > (assuming you are using daughterboards with coherent local
> > oscillators.)
> >
> > Regarding the inband code, this has become unmaintained; we've already
> > removed it on our 3.3 development trunk.  The host code will get
> > rewritten using the 3.3 message passing architecture.  The FPGA code
> > has issues (as you've noted), and I think there are some patches
> > floating around that fix some of them, but haven't gotten integrated.
> > Eric might have a better handle on this.
> >
> 
> You can try some firmwares that Eric Schneider built in an attempt to fix
> the timestamps with 2 channels:
> http://www.schneider-group.com/gnuradio/r9581-ets-inband_2rxhb_2tx.zip
>
> Search for his name on the list archives and you'll find the discussion.
> 
> George


FWIW, I think the corresponding source lives here:
  
  $ svn co http://gnuradio.org/svn/gnuradio/branches/developers/ets/inband  

Eric


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