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Re: [Discuss-gnuradio] Problem with multiple flow graphs on receive side

From: adib_sairi
Subject: Re: [Discuss-gnuradio] Problem with multiple flow graphs on receive side
Date: Thu, 30 Jul 2009 19:51:23 -0700 (PDT)

Sriram Krishnan-3 wrote:
> Hi,
> I am trying to write an application which senses spectrum 
> (usrp_spectrum_sense.py) and transmits/receives signals. I have the 
> tx/rx working fine. But when i add another flow graph(3rd one to 
> existing tx and rx) for the spectrum sense,to the top block, it gives me 
> an error. I get an error on this line which says "cant open rx 
> interface" and "device busy"
> self._u = usrp.source_c (self._which,
>                                 fusb_block_size=self._fusb_block_size,
>                                 fusb_nblocks=self._fusb_nblocks)
> Is it because of competing receive paths. I thought that we could have 
> multiple paths.
> Could somebody help in this regard.

maybe it is because you are already open the rx part and you try to open it
again for sensing.. 

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