On 04/25/2018 10:53 AM, Hojoon Yang via USRP-users wrote:
Hi,
I connected one usrp b210 and one usrp b200 to octoclock for
synchronization.
I'm trying to verify that the usrps connected to octoclock is "really"
synchronized.
To check it, I did as follows.
usrp->set_time_next_pps(uhd::time_spec_t(0.0));
usrp2->set_time_next_pps(uhd::time_spec_t(0.0));
boost::this_thread::sleep(boost::posix_time::seconds(2));
uhd::time_spec_t start_time = usrp->get_time_now() +
uhd::time_spec_t(0.1);
usrp->set_command_time(start_time);
uhd::time_spec_t usrp_t = usrp->get_time_now();
uhd::time_spec_t usrp2_t = usrp2->get_time_now();
usrp->clear_command_time();
I think I did wrong, because the results are different from my
expectations.
Q1. Can I execute usrp->get_time_now(); and usrp2->get_time_now();
simultaneously? I'm trying to use set_command_time, but it didn't work
well as above.
Q2. How can I verify that the two usrps connected to the octoclock, is
really synchronized? in terms of time..
I already used get_time_last_pps() command, this command works
perfect, the two usrps showed same value.
but this command only showed "the full_secs" which does not include
frac_secs.. I want to check "the frac_secs" between two usrps.
I read this thread,
http://lists.ettus.com/pipermail/usrp-users_lists.ettus.com/2015-January/012227.html
But, I can't find the way to check frac_secs..
Hojoon
https://files.ettus.com/manual/classuhd_1_1usrp_1_1multi__usrp.html#afb4bffe3f969c11ee7c0a2cba5178780
Returns a time_spec_t, and there are multiple methods associated with
time_spec_t
https://files.ettus.com/manual/classuhd_1_1time__spec__t.html
Including get_real_secs()
Many of the example programs included with UHD source use this
method--you could look there usage examples.
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