Re: [Discuss-gnuradio] Delay of synchronization with PPS and UHD on USRP2

[Manuel Fuhr]

2010/5/21 周亮 <address@hidden>:
> Hi,
>
> These days I am trying to synchronize two USRP2 with PPS signal  and UHD.
> The two USRP2 is connect with same reference clock and PPS signal. I use
> function "set_time_next_pps(uhd::time_spec_t(0))" to set time to be zero,
> and make two USRP2 start sampling after 3 seconds. The result shows that
> there is still phase difference, which means a delay( about 30ns) between
> USRP2s.
I tried to use the set_time_next_pps() too and had the problem, that
it updates the timing information even if no PPS pulse occurs.
Attached is a patch that first sets the PPS configuration and updates
the timing information afterswards.

Manuel

0001-Send-timing-information-after-immediately-flags.patch
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