On 04/23/2019 11:48 AM, Fabian Schwartau via USRP-users wrote:
Hi,
its the same. I found the bug because the timed commands took much
longer than expected, so the USRP clock is actually running at a lower
rate. However, the spectra looked ok and everything else seems to be
working as usual, except there is a larger delay between the commands.
So the USRP is not running at a wrong clock or something like that.
That would probably cause much larger issues.
Best regards,
Fabian
If you revert to a previous release, does the problem go away?
Am 23.04.2019 um 17:27 schrieb Marcus D. Leech via USRP-users:
On 04/23/2019 09:47 AM, Fabian Schwartau via USRP-users wrote:
Hi everyone,
I just found a very strage bug and would like to confirm that this
is a bug and if someone can explain/fix this.
I read the time from the USRP using get_time_now() and do a lot of
stuff with it. Mainly to time commands like frequency hopping and
starting of streams. I noticed that the time in the USRP seemed to
run slower than expected, actually by a factor of two.
Please find a program attached that demonstrates this effect. It
prints the internal USRP time roughly every second (using sleep) but
the USRP time increments only by 0.5 seconds in each step. What is
going on?
The program can be compiled using:
g++ -std=c++14 -O2 main.cpp -luhd -lboost_system -o main
I am using a single (or multiple - does not have an effect) X310
with two TwinRX. UHD is "linux; GNU C++ version 5.5.0 20171010;
Boost_105800; UHD_3.15.0.git-89-gf93c5227" from yesterday. FPGA
image is also from yesterday using the download script - where can I
find the version number? I am running an up-to-date Ubuntu 16.04.
Could you try the print as a get_frac_secs() and get_full_secs()
instead? To disambiguate whether this is an actual hardware clock
management
issue or just a formatting issue.
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