Hi,
did error checking, no errors.
The sleep also fits quite well with my feeling and in my main program I
am working on, I am using QThread::currentThread->sleep(1) and
additionally printing the current system time. So I am very confident
this is a problem on the USRP side.
I switched to an up to date UHD/FPGA image version just yesterday.
Before that I was using a version from a bit more than a year ago and I
am quite sure this did not happen in the old version. It was commit
bd6e21dc.
If noone has an idea (maybe I am doing something really stupid), I will
open a bug report.
Best regards,
Fabian
Am 23.04.2019 um 16:31 schrieb Tillson, Bob (US):
While I would not expect sleep to fail consistently, it *can* return a non zero
value when not sleeping for the entire time.
Try checking the return value for success. Its not likely this is the cause if
it happens every time, but error checking is your friend :)
-----Original Message-----
From: USRP-users <usrp-users-boun...@lists.ettus.com> On Behalf Of Fabian
Schwartau via USRP-users
Sent: Tuesday, April 23, 2019 9:47 AM
To: usrp-users <usrp-users@lists.ettus.com>
Subject: [USRP-users] USRPs time wrong by factor of two
*** WARNING ***
EXTERNAL EMAIL -- This message originates from outside our organization.
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
--------------------------------------------------
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