"how can i make the usrp send its time when configured for synchronization?"
I might be misunderstanding the question, but here's an answer. The USRP source outputs stream tags on the first sample when streaming. The three tags are 1) rx_time 2) rx_rate 3) frequency. Using (1) and (2), you should be able to determine and track the time of the USRP. You would use set_command_time for anything with commands - gpio, tuning, etc. This is in the control plane. You do timed bursts in the data plane with stream tags -> tx_sob, tx_time, tx_eob. If these terms are foreign to you, Google "introduction to stream tags" by Tom R. -John On Sun, Jun 16, 2013 at 12:02 PM, Jay Prakash <jay.prakash.ec...@itbhu.ac.in > wrote: > I think i can use set_command_time (which i guess set the next time of > transmission/command?). > how can i make the usrp send its time when configured for synchronization? > > Jay Prakash > Senior Undergraduate > Electronics Engineering > IIT (BHU) > VARANASI > > +91-9559475258 > http://about.me/jay.prakash/ > http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top > > > > > On Sun, Jun 16, 2013 at 11:58 PM, John Malsbury > <john.malsb...@ettus.com>wrote: > >> "XML_RPC block in the new gr-extras" >> >> XML_RPC would have been subject to the same limitations. It could only >> call set_time_next_pps if set_time_next_pps was in the uhd_sink/source >> blocks. Maybe you can update them to include the function. >> >> Let me ask a more fundamental questions - why do you want to reset the >> time? >> >> -John >> >> >> On Sun, Jun 16, 2013 at 11:20 AM, Jay Prakash < >> jay.prakash.ec...@itbhu.ac.in> wrote: >> >>> so do we have any other block to do that. I did'nt find XML_RPC block in >>> the new gr-extras >>> >>> >>> Jay Prakash >>> Senior Undergraduate >>> Electronics Engineering >>> IIT (BHU) >>> VARANASI >>> >>> +91-9559475258 >>> http://about.me/jay.prakash/ >>> http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top >>> >>> >>> >>> >>> On Sun, Jun 16, 2013 at 11:43 PM, Adeel Anwar <adeela...@gmail.com>wrote: >>> >>>> > so i checked the new grextras wiki it has uhd_control block i guess >>>> that can be used for this job. >>>> uhd_control block supports only a subset of usrp-functions (exposed >>>> through gr-uhd) e.g. "set_command_time", set/get_gain/freq etc BUT >>>> currently it doesn't support "set_time_now()" >>>> >>>> https://github.com/guruofquality/grextras/blob/master/lib/uhd_control_port.cpp >>>> >>>> -Adeel >>>> >>>> >>>> On Sun, Jun 16, 2013 at 11:06 AM, Jay Prakash < >>>> jay.prakash.ec...@itbhu.ac.in> wrote: >>>> >>>>> thanks for the clarification >>>>> so i checked the new grextras wiki it has uhd_control block i guess >>>>> that can be used for this job. >>>>> >>>>> Jay Prakash >>>>> Senior Undergraduate >>>>> Electronics Engineering >>>>> IIT (BHU) >>>>> VARANASI >>>>> >>>>> +91-9559475258 >>>>> http://about.me/jay.prakash/ >>>>> http://www.linkedin.com/profile/view?id=91120191&trk=hb_tab_pro_top >>>>> >>>>> >>>>> >>>>> >>>>> On Sun, Jun 16, 2013 at 11:05 PM, John Malsbury < >>>>> john.malsb...@ettus.com> wrote: >>>>> >>>>>> The GPSDO can provide an "internal" 10 MHz/1 PPS signal. I'm not >>>>>> sure if that's what you meant or not: >>>>>> https://www.ettus.com/product/details/GPSDO-KIT >>>>>> >>>>>> AFIAK, you cannot set the time of a USRP with a message. You may be >>>>>> able to use the XML_RPC block in gr-extras to call the function if it is >>>>>> exposed through gr-uhd. >>>>>> >>>>>> -John >>>>>> >>>>>> >>>>>> On Sun, Jun 16, 2013 at 10:30 AM, Jay Prakash < >>>>>> jay.prakash.ec...@itbhu.ac.in> wrote: >>>>>> >>>>>>> how can we set the time of usrp by sending it message. I know there >>>>>>> are function to (usrp.set_time_now()) do this from from top block >>>>>>> variable >>>>>>> but can this be done by sending message at usrp port . >>>>>>> We can give internal reference signal of 10MHz but is there also a >>>>>>> way to give pps signal internally i.e. without using any external >>>>>>> hardware. >>>>>>> >>>>>>> >>>>>>> _______________________________________________ >>>>>>> Discuss-gnuradio mailing list >>>>>>> Discuss-gnuradio@gnu.org >>>>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>>>> >>>>>>> >>>>>> >>>>> >>>>> _______________________________________________ >>>>> Discuss-gnuradio mailing list >>>>> Discuss-gnuradio@gnu.org >>>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>>>> >>>>> >>>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >>> >> >
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