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[Discuss-gnuradio] Re: USRP Tx Question

From: Jeffrey Karrels
Subject: [Discuss-gnuradio] Re: USRP Tx Question
Date: Fri, 27 Jul 2007 10:00:42 -0400

I am currently exploring the multiple USRP Tx problem. I came across a
thread from 2006 with someone working on similar problems... Has there
been any progress on this? I don't want to duplicate any work.


On Sun, Apr 16, 2006 at 08:09:39PM -0400, Elaine Garbarine wrote:
> On 4/15/06 4:32 PM, "Eric Blossom" <address@hidden> wrote:
> For the time being just never setting the frequency to anything other than 0
> will do so I'm going to do that in order to bypass the DUC in the AD9862.  I
> just want to see if I can get some sort of transmit sync working before I
> add a DUC back into the picture (and I'll definitely need to look into
> implementing the DUC in the FPGA instead of using the one in the AD9862).


> As for the transmit sync my thought was to have the "master" USRP send a
> flag of some sort (probably by setting one of the daughterboard header pins
> high) when it was about to transmit.  I would then have the slave USRP
> transmit upon seeing this flag on one of it's daughterboard pins.  I'm
> thinking the best place to put these code modifications would be in
> master_control unless anyone has a better suggestion.
> I do have one question about altering and recompiling the FPGA code.  Once I
> use the Quartus software to recompile the code do I just copy this new code
> into the correct directories in my Linux box (running GNU Radio) or is there
> something else I need to do to get the new code onto the FPGA?

Just copy the foo.rbf file to PREFIX/share/usrp/rev<N>/foo.rbf


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