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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