Hi,

> You need to configure the usrp2 to use the external reference. Did you 
> run set_clock_config(...) prior to setting the time?
Yes,
I have set the clock config to make USRP2 lock to reference clock SMA and PPS 
SMA. 

> When performing set_time_next_pps(...) you will want a sleep(1) prior to 
> starting streaming. Because it could take as much as 1 second for the 
> registers to latch the new time value.
Yes, I have used sleep(1) commmand after I call set_time_next_pps() function. 
The problem is that if I replace the mode " 
STREAM_MODE_NUM_SAMPS_AND_DONE" with " STREAM_MODE_START_CONTINUOUS ",it works. 
 The rest of code is same.



Thank you!

Liang
                                          
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