On Wed, Sep 7, 2011 at 3:27 AM, Lebowski80 <ale.rasche...@gmail.com> wrote:
>
> Hello everyone,
>
> Before to explain my problem I give some technical information about my
> hardaware. I'm using USRPs v1 and the boards integrated are XCVR2450
> Transceivers.
>
> I'm using the script usrp_spectrum_sense.py in a USRP (called USRP1) to
> make
> sensing in the ISM band, after a few seconds it sends to another USRP
> (Called USRP2) a free sensed channel on the central frequency 2484 MHz.
> USRP2 listens to the channel 2484 MHz through the script benchmark_rx.py
> and
> it can properly receive the free ISM channel sent by USRP1. Then, I want to
> use the USRP2 to receive data from another USRP (called USRP3) that uses
> the
> script benchmark_tx.py.
>
> In the script benchmark_rx.py (used by USRP2) that listens to channel 2484
> MHz I want to run another script that I called benchmark_rxr.py that waits
> for data sent by USRP3 to be received in the free ISM channel sent by
> USRP1.
>
> Relevant line of the code in the script benchmark_rx.py is attached below:
>
> p = Popen('python benchmark_rxr.py', shell = True)
>
> While this is the error that I get:
>
> usrp_open_interface:usb_claim_interface: failed interface 2
> could not claim interface 2: Device or resource busy
> usrp_basic_rx: can't open rx interface
> Traceback (most recent call last):
> File "benchmark_rxr.py", line 153, in <module>
> main()
> File "benchmark_rxr.py", line 138, in main
> tb = my_top_block(demods[options.modulation], mods[options.modulation],
> rx_callback, options)
> File "benchmark_rxr.py", line 46, in __init__
> self.rxpath = usrp_receive_path.usrp_receive_path(demodulator,
> rx_callback, options)
> File "/opt/gnuradio/gnuradio-examples/python/usrp/usrp_receive_path.py",
> line 65, in __init__
> self._setup_usrp_source(options)
> File "/opt/gnuradio/gnuradio-examples/python/usrp/usrp_receive_path.py",
> line 78, in _setup_usrp_source
> self.u = usrp_options.create_usrp_source(options)
> File "/usr/local/lib/python2.6/dist-packages/gnuradio/usrp_options.py",
> line 88, in create_usrp_source
> gain=options.rx_gain,
> File
>
> "/usr/local/lib/python2.6/dist-packages/gnuradio/blks2impl/generic_usrp.py",
> line 138, in __init__
> _generic_usrp_base.__init__(self, **kwargs)
> File
>
> "/usr/local/lib/python2.6/dist-packages/gnuradio/blks2impl/generic_usrp.py",
> line 63, in __init__
> except: raise Exception, 'Failed to automatically setup a usrp device.'
> Exception: Failed to automatically setup a usrp device.
>
> I read different post with this problem such as "Full duplex and half
> duplex
> does not work" and "help: cannot send after transport endpoint shutdown"
> but
> I could not solve the problem yet. I need to close the reception in 2484
> MHz
> channel for a new reception in another channel in USRP2. The only way to do
> that seems to close the port manually (i.e. pressing ctrl+c) but I want to
> do that by code. I tried different things before the line "p =
> Popen('python
> benchmark_rxr.py', shell = True)" such as "id_process = os.getpid()" and
> "os.killpg(id_process, 2)", or by "tb.lock()" and "tb.unlock" and so on,
> but
> nothing helped me, I keep obtaining the same error. I don't know what to do
> else, can I change by code reception frequency in USRP2? Any advice will be
> welcome, thanks a lot!
>
You need to run both RX and TX in the same flowgraph. You can't open them in
separate flowgraphs.
--n
>
> Regards
>
>
> --
> View this message in context:
> http://old.nabble.com/How-to-reconfigure-automatically-the-channel-used-to-received-data-in-USRPs-tp32414957p32414957.html
> Sent from the GnuRadio mailing list archive at Nabble.com.
>
>
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