Hi Fabian, Could it be related with this issue <https://www.mail-archive.com/usrp-users@lists.ettus.com/msg06940.html> I came across too?
Have you tried an older version? Regards, Xavier On Fri, 30 Nov 2018 at 18:56, Marcus D. Leech via USRP-users < usrp-users@lists.ettus.com> wrote: > On 11/30/2018 06:11 AM, Fabian Schwartau via USRP-users wrote: > > Hi Marcus, > > > > is there any update? > > > > Best regards, > > Fabian > Still being worked. > > > > > Am 19.11.2018 um 20:22 schrieb Marcus D. Leech via USRP-users: > >> On 11/19/2018 06:35 AM, Fabian Schwartau via USRP-users wrote: > >>> Anyone? This is a quite annoying bug and I am having trouble working > >>> around it as I cannot meet my timing requirements. > >> I'm only about 50% certain that sample-rate setting is covered by > >> timed commands. I'll talk to R&D and get back to you on this. > >> > >> > >>> > >>> Am 20.07.2018 um 11:05 schrieb Fabian Schwartau via USRP-users: > >>>> Hello everyone, > >>>> > >>>> I am experencing some issues when switching the sample rate. > >>>> I have two synchronized USRP X310 with a total of 4 TwinRX. I am > >>>> doing timed commands to jump around in the spectrum with all > >>>> receivers at the same frequency (SIMO stuff). > >>>> I also need to switch sample rates in between. When I keep the > >>>> sample rate constant, everything works fine, but once I switch it > >>>> between two timed receptions, I get very strange errors. Like I get > >>>> an end-of-frame after just a part of the samples I requested. > >>>> It seems like it is not possible to time the sample rate switch > >>>> command. Here is a debug output of my code which makes it quite > >>>> clear what happens: > >>>> > >>>> (1) Changed sample rate from 1e+07 to 5e+07 > >>>> (2) Requested 32768 Samples > >>>> (3) Requested 32768 Samples > >>>> (4) Requested 32768 Samples > >>>> (5) Changed sample rate from 5e+07 to 1e+07 > >>>> (6) Reading 32768 Samples > >>>> (7) Got only 6553 of 32768 samples at EOF > >>>> > >>>> Commands 1-5 are transmitted to the USRP right away using its > >>>> command buffer. Then my program starts reading the first requested > >>>> 32768 but gets only 6553, which is precisely 1/5th of the requested > >>>> samples. I guess this is because he switched sample rate to 1/5th > >>>> right before executing the first stream command. But the sample > >>>> rate switch is also timed and should be executed after the three > >>>> stream commands. > >>>> > >>>> I attached the part of the code which is responsible for sending > >>>> the timed commands to the USRPs. This runs basically in a while(1) > >>>> in a seperate thread, while there is a seconds thread receiving the > >>>> data blocks, which produced the lines 6-7 of above output. > >>>> > >>>> Is this a bug or feature I don't get? Are set_rx_rate commands not > >>>> timed when using set_command_time? How can I solve this isse? I > >>>> need very precise timing and also fast switching between > >>>> frequencies and sample rates. > >>>> > >>>> Best regards, > >>>> Fabian > >>>> > >>>> _______________________________________________ > >>>> USRP-users mailing list > >>>> USRP-users@lists.ettus.com > >>>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >>>> > >>> > >>> _______________________________________________ > >>> USRP-users mailing list > >>> USRP-users@lists.ettus.com > >>> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > >> > >> > >> _______________________________________________ > >> USRP-users mailing list > >> USRP-users@lists.ettus.com > >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > > _______________________________________________ > > USRP-users mailing list > > USRP-users@lists.ettus.com > > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com > > > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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