Re: [Discuss-gnuradio] RFX-1800 Tranciever

[Eric Blossom]

On Wed, Jul 01, 2009 at 11:38:53AM -0500, Jason Uher wrote:
> >> I believe if you have two daughter cards it is possible to run the
> >> benchmark_*x scripts on the same USRP but different daughtercards, but
> >> I think you need to combine them into a single flow graph.  If I
> 
> > You can't run benchmark_tx and _rx using one USRP and two
> > daughtercards.  The two sides of the USRP aren't fully independent.
> >
> > Eric
> >
> 
> 
> Even if you combine the code into a single flowgraph?

Sorry, you're right.  The tunnel code does something very much like
what you have below.

The problem I was thinking of was the case where you're trying to run
two daughterboards, each of which is trying to run half-duplex, and
the Tx/Rx timing on the two sides is independent.  In that case the
Auto-TR stuff gets in the way.

Eric




> It's been a
> very long time since I tried it, so maybe there are new firmware
> changes I'm not aware of; but I know that I've gotten something like
> the following working with the *_path files modified to use different
> daughterboards and the passed usrp object:
> 
> class my_top_block(gr.top_block):
>     def __init__(self, demodulator, rx_callback, options):
>         gr.top_block.__init__(self)
> 
>        (SNIP: Set up the usrp here)
> 
>         self.rxpath = receive_path(self.usrp, demodulator,
> rx_callback, options)
>         self.connect(self.rxpath)
> 
>         self.txpath = transmit_path(self.usrp, demodulator, options)
>         self.connect(self.txpath)
>