Short answer: You cannot open a new USRP instance to reconfigure an already-running USRP instance. You must reconfigure the existing instance.
The best advice I can give is that only one flowgraph can be operational per USRP device. In your setup, USRP#1 will run a single flowgraph with a source and/or sink, USRP#2 will run a single flowgraph with a source and/or sink, and USRP#3 will run a single flowgraph with a source and/or sink. If you wish to change the parameters of USRP#2 while it is running, rather than try to open a new USRP device in your benchmark_rxr.py flowgraph, use any of the standard interprocess communication methods to talk to your already-running USRP#2 script and reconfigure it as necessary. --n On Wed, Sep 7, 2011 at 9:31 AM, Lebowski80 <[email protected]> wrote: > > Hello Nick, > > What do you mean? Actually I'm running RX and TX in two different > flowgraphs > on USRP1, the first one in usrp_spectrum_sense.py to look for a free > channel > (so the RX). In this script I also run benchmark_tx.py by the command p = > Popen('python benchmark_tx.py', shell = True), then my second flowgrapgh > (the TX). > > My problem is that on USRP2 I want to reconfigure the RX channel by python > (RX channel = 2484 MHz in the script benchmark_rx.py and RX channel = > channel received by USRP1 in the script benchamrk_rxr.py run by > benchmark_rx.py with the command p = Popen('python benchmark_rxr.py', shell > = True)). > > So I'm wondering if there exists the possibility to reconfigure the > parameters of a script in the same USRP (i.e. RX frequency channel) while > it > is running and if this is not possible what do people mean with "USRP > reconfigurability?" > > I really need an answer to understand the potentiality of my hardware, > thanks a lot! > > Regards > > > > Nick Foster-4 wrote: > > > > On Wed, Sep 7, 2011 at 3:27 AM, Lebowski80 <[email protected]> > > 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. > >> > >> > >> _______________________________________________ > >> Discuss-gnuradio mailing list > >> [email protected] > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >> > > > > _______________________________________________ > > Discuss-gnuradio mailing list > > [email protected] > > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > > > -- > View this message in context: > http://old.nabble.com/How-to-reconfigure-automatically-the-channel-used-to-received-data-in-USRPs-tp32414957p32417577.html > Sent from the GnuRadio mailing list archive at Nabble.com. > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >
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