Re: [Discuss-gnuradio] UHD: "set_time_now" and "get_time_now" in multi_usrp

[Per Zetterberg]

Yes it could be useful when debugging the setup. However, it can't be
used to verify sample-level sync.


BR/
Per

On Wed, 2010-10-27 at 08:43 -0700, Josh Blum wrote:
> get_time_now() returns the time on the 0th motherboard in the 
> configuration. The only reason you might want to read the time on a 
> particular board in the configuration is to test for sync.
> 
> There is some logic already in the set_time_unknown_pps() to check for 
> sync. Would that be useful to be brought out as a "bool
> is_time_synced()" method?
> 
> http://code.ettus.com/redmine/ettus/projects/uhd/repository/revisions/master/entry/host/lib/usrp/multi_usrp.cpp#L143
> 
> _josh
> 
> On 10/27/2010 03:35 AM, Per Zetterberg wrote:
> > I realize that a "set_time_now" in multi_usrp would be dubious because
> > without any PPS all USRPs would have somewhat different times (maybe on
> > the order of microseconds to milliseconds). This is (typically) not
> > enough for MIMO applications.
> > However, if one is aware of this fact it can be useful. It means for
> > instance that one can verify that multi-usrp reception works even
> > without having set up PPS.
> >
> > BR/
> > Per
> >
> >
> > On Wed, 2010-10-27 at 11:40 +0200, Per Zetterberg wrote:
> >> Hi Josh and List,
> >>
> >> There is no set_time_now in multi_usrp. When I use get_time_now which
> >> USRP2 do I get the time of ?
> >>
> >> BR/
> >> Per
> >>
> >>
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