I assume you mean the usrp source block. This will accept stream commands
so you don't need to write your own block.

M
On 29 Jan 2016 04:14, "Zhihong Luo" <zh...@umich.edu> wrote:

> Hi all,
>
> I just started to use GNU Radio for testing on USRP, and I want to make
> the USRP receive signal periodically.  So that for example, it will receive
> for half a second, then rest for 10 seconds, during which it won't  request
> data from USRP.
>
> I previously used GRC, but the usrp sink block doesn't have this function.
> So I may need to write a custom C OOT block. Can you give me a clue on how
> to do this? Because I didn't find example specifically for usrp on the
> website.
>
> Thanks a lot.
>
> Zhihong Luo
>
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>
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