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Re: [Discuss-gnuradio] Flow graph issue with usrp1+RFX2400 daughter boar
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From: |
Josh Blum |
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Subject: |
Re: [Discuss-gnuradio] Flow graph issue with usrp1+RFX2400 daughter board and TX/RX antenna |
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Date: |
Fri, 21 Jun 2013 19:27:27 -0400 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 |
On 06/21/2013 07:25 PM, Arturo Rinaldi wrote:
> Hi folks, I've recently bumped into an issue with two GRC flow graphs
> while running a rx/tx loop path interfacing with an external sensor :
>
> *T**X path - UHD Usrp1 Sink (sending data to the sensor)*
>
> http://img713.imageshack.us/img713/4540/gyz.png
>
> *RX path - UHD Usrp1 Source (receiving data from the sensor)*
>
> http://img822.imageshack.us/img822/521/dq8.png
>
> I'm using a USRP1 mainboard and a RFX2400 daughter board using the TX/RX
> section. I can run the TX flow graph, but when i launch the other one,
> the shell warns me about an UHD error. The uhd driver can't find the
> usrp1 card (specifically, the *uhd source object* can't be built because
> the uhd driver is not able find the usrp device), it's like the tx path
> had an exclusive possession of the A:0 subdevice (the *TX/RX* one on
> which I put my antenna).
>
> Do I have to pass some command line switches to the uhd driver to solve
> this issue ? Thanks in advance.
>
The device can only be opened once per process. Either run both flow
graphs in the same process, or combine both flowgraphs into one flowgraph.
-josh