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

[Josh Blum]

It turns out that the time registers were being written in the wrong order.
I have pushed a fix to the master (seconds need to be written last).

-Josh

On Mon, May 24, 2010 at 3:49 AM, Manuel Fuhr
<address@hidden> wrote:
> 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
>
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