Re: [Discuss-gnuradio] timed command

[Gong Zhang]

Your reply gave me much inspiration.Given the "set_command_time" would 
back-pressure all subsequent timed commands,would the data transmitting be suspended?

2013/3/4 Adeel Anwar <address@hidden>:

> > Gong,
> >
> > Attached is a simple freq-hopping example using timed-commands.
> >  U may need to change "freq_list " that should match ur RF-Daughter card
> >
> >
> > -Adeel
> >
> > On Mon, Mar 4, 2013 at 5:18 PM, Gong Zhang <address@hidden> wrote:
>   
> > >>
> > >>  2013/3/4 15:56, Josh Blum wrote:
> >     
> > > >>>
> > > >>>
> > > >>> On 03/03/2013 09:28 PM, Gong Zhang wrote:
> > >       
> > > > >>>>
> > > > >>>> Hi,
> > > > >>>> I wanna transmit a 1khz Sinusoidal signal for one second and transmit
> > > > >>>> 2khz for another second.The code maybe something like this:
> > > > >>>> set_command_time(&mytime)
> > > > >>>> sig_sin_source.work(...)
> > > > >>>> set_command_time(&mytime+1)
> > > > >>>> sig_sin_source.work(...)
> > > > >>>> But as I know,the first set_command_time would back-pressure all
> > > > >>>> subsequent timed commands.This would make it impossible for the second
> > > > >>>> set_command_time to reach the USRP buffer in time.
> > > > >>>> Is it correct?And what's the suggestion?
> > > > >>>> I appreciate any tips.
> > > > >>>> Thank you.
> > > > >>>>
> > > >         
> > > >>> For timing the transmission of samples you will want to use the stream
> > > >>> tagging feature of gnuradio (some examples and docs in the link):
> > > >>>
> > > >>> 
> > > http://code.ettus.com/redmine/ettus/projects/uhd/wiki/GNU_Radio_UHD#Using-UHD-Software-with-GNU-Radio
> > > >>>
> > > >>> The timed commands thing is really for timing settings like tuning the
> > > >>> device, or setting gain at a specific time, its separate from the
> > > >>> streaming interface.
> > > >>>
> > > >>> -josh
> > > >>>
> > >       
> > >> Thank you for your valuable feedback.//If I wanna retune the device every
> > >> second,it really has nothing to do with data stream.Maybe I should refer to
> > >> python or UHD.Can you give me some example?
> > >>
> > >>
> > >>
> > >> _______________________________________________
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> > >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
> >     
> >
> >
>