Hi all, I think what Lefteris tries to implement is a 2x2 loopback with a USRP-B210.
At least this is what I can see from the flowgraph attached in the first email. Is that possible with B210? Best, George On Mon, Nov 17, 2014 at 5:47 PM, Ben Hilburn <[email protected]> wrote: > Hi Lefteris - > > We recently added that warning. We think we got it right, but it's > possible something is wrong with the logic that makes it fire. > > Can you share your GRC flowgraph? > > Cheers, > Ben > > On Mon, Nov 17, 2014 at 2:28 PM, Marcus D. Leech <[email protected]> > wrote: > >> On 11/17/2014 05:15 PM, Lefteris Kampianakis wrote: >> >> Hello, >> >> FYI I am having problems even with a simpler configuration like this: >> >> USRP_source_channel1 --> USRP_sink_channel1 >> USRP_source_channel2 --> USRP_sink_channel2 >> >> >> Does anyone face the same issue? It is really frustrating because 1/3 >> executions are wasted and this causes problems with later design, that has >> to have an execution rate of > 1Hz >> >> Thank you in advance >> Lefteris >> >> >> >> >> >> >> On Fri, Nov 14, 2014 at 6:32 PM, Lefteris Kampianakis < >> [email protected]> wrote: >> >>> Hello, >>> >>> I have a B210 and I am trying to transmit and receive from all it's >>> channels simultaneously. My setup is a macmini late 2012 with Ubuntu 12.04 >>> install. I compiled and installed gnuradio from source using the gnuradio >>> build script. I have developed the attached very simple GRC script that >>> looks like this >>> >>> signal_source@1khz --> USRP_sink_channel1 >>> signal_source@2khz --> USRP_sink_channel2 >>> >>> USRP_source_channel1 --> WX_GUI_scope_channel1 >>> USRP_source_channel2 --> WX_GUI_scope_channel2 >>> >>> The problem I have is that I get the following message at random times >>> and on average on 1/3 executions of the GRC script. >>> >>> linux; GNU C++ version 4.6.3; Boost_104800; UHD_003.008.000-18-g864f84b5 >>> >>> Using Volk machine: avx_64_mmx_orc >>> -- Operating over USB 3. >>> -- Initialize CODEC control... >>> -- Initialize Radio control... >>> -- Performing register loopback test... pass >>> -- Performing register loopback test... pass >>> -- Performing CODEC loopback test... pass >>> -- Performing CODEC loopback test... pass >>> -- Asking for clock rate 32.000000 MHz >>> -- Actually got clock rate 32.000000 MHz >>> -- Performing timer loopback test... pass >>> -- Performing timer loopback test... pass >>> -- Asking for clock rate 28.000000 MHz >>> -- Actually got clock rate 28.000000 MHz >>> -- Performing timer loopback test... pass >>> -- Performing timer loopback test... pass >>> -- Tune Request: 915.000000 MHz >>> -- The RF LO does not support the requested frequency: >>> -- Requested LO Frequency: 915.000000 MHz >>> -- RF LO Result: 914.999999 MHz >>> -- Attempted to use the DSP to reach the requested frequency: >>> -- Desired DSP Frequency: -0.000001 MHz >>> -- DSP Result: -0.000001 MHz >>> -- Successfully tuned to 915.000000 MHz >>> -- >>> -- Tune Request: 915.000000 MHz >>> -- The RF LO does not support the requested frequency: >>> -- Requested LO Frequency: 915.000000 MHz >>> -- RF LO Result: 914.999999 MHz >>> -- Attempted to use the DSP to reach the requested frequency: >>> -- Desired DSP Frequency: -0.000001 MHz >>> -- DSP Result: -0.000001 MHz >>> -- Successfully tuned to 915.000000 MHz >>> -- >>> -- Asking for clock rate 28.000000 MHz >>> -- Actually got clock rate 28.000000 MHz >>> -- Performing timer loopback test... pass >>> -- Performing timer loopback test... pass >>> -- Tune Request: 915.000000 MHz >>> -- The RF LO does not support the requested frequency: >>> -- Requested LO Frequency: 915.000000 MHz >>> -- RF LO Result: 914.999999 MHz >>> -- Attempted to use the DSP to reach the requested frequency: >>> -- Desired DSP Frequency: 0.000001 MHz >>> -- DSP Result: 0.000001 MHz >>> -- Successfully tuned to 915.000000 MHz >>> -- >>> -- Tune Request: 915.000000 MHz >>> -- The RF LO does not support the requested frequency: >>> -- Requested LO Frequency: 915.000000 MHz >>> -- RF LO Result: 914.999999 MHz >>> -- Attempted to use the DSP to reach the requested frequency: >>> -- Desired DSP Frequency: 0.000001 MHz >>> -- DSP Result: 0.000001 MHz >>> -- Successfully tuned to 915.000000 MHz >>> -- >>> *thread[thread-per-block[2]: <block gr uhd usrp sink (24)>]: >>> RuntimeError: b200: 2 RX 1 TX and 1 RX 2 TX configurations not possible* >>> >>> >>> It is obvious that I have all channels activated and that this message >>> shouldn't be appearing in the first place, let alone, appearing in a >>> non-deterministic manner. >>> >>> Any ideas? >>> >>> Thank you in advance >>> Lefteris >>> >> >> >> >> -- >> Eleftherios(Lefteris) Kampianakis >> Electronics and Computer Engineer >> PHD Candidate and Researcher at Sensing Computing Communications Group >> (SGCC) >> Department of Electrical Engineering >> University of Washington >> 3927 Adams Lane, NE, Mercer Court D805B, 98105 >> website: http://staff.washington.edu/ekampian/ >> <http://users.isc.tuc.gr/%7Eekabianakis/> >> mail: [email protected] >> >> >> _______________________________________________ >> Discuss-gnuradio mailing >> [email protected]https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> >> We shall probably need a more-detailed description of what you're >> doing. Like the actual .grc files, etc. >> >> From your description, I think you're wanting to: >> >> bring up flow-graph, exchange a very small number of samples, and then >> exit the flow-graph, and do this in a loop? >> >> That seems horribly inefficient, quit distinct from it perhaps uncovering >> possible bugs in the latest UHD. >> >> But providing more information will help those who can help you. >> >> >> -- >> Marcus Leech >> Principal Investigator >> Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org >> >> >> _______________________________________________ >> 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 > > -- Sklivanitis Georgios Postgraduate Student Telecommunications Division Technical University of Crete ECE Dept. Tel. : 28210 59257
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