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.
--
--------------------------------------------------
M.-Sc. Fabian Schwartau
Technische Universität Braunschweig
Institut für Hochfrequenztechnik
Schleinitzstr. 22
38106 Braunschweig
Germany
Tel.: +49-(0)531-391-2017
Fax: +49-(0)531-391-2045
Email: fabian.schwar...@ihf.tu-bs.de
WWW: http://www.tu-braunschweig.de/ihf
--------------------------------------------------
// g++ -std=c++14 -O2 main.cpp -luhd -lboost_system -o main
#include <uhd/usrp/multi_usrp.hpp>
#include <uhd/utils/safe_main.hpp>
#include <uhd/utils/thread.hpp>
#include <iostream>
using namespace std;
int UHD_SAFE_MAIN(int, char*[])
{
uhd::set_thread_priority_safe();
// Init USRP
std::string args = "addr0=192.168.41.2";
uhd::usrp::multi_usrp::sptr usrp = uhd::usrp::multi_usrp::make(args);
for(int i = 0; i < 10; i++)
{
cout<<usrp->get_time_now().get_real_secs()<<endl;
sleep(1);
}
return 0;
}
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