On 03/04/2013 08:28 AM, Gong Zhang wrote: > Your reply gave me much inspiration.Given the "set_command_time" would > back-pressure all subsequent timed commands,would the data transmitting > be suspended?
The streaming data will work independent of the backpressure when the command queue is full. -josh > > 2013/3/4 Adeel Anwar <adeela...@gmail.com>: > >> > 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 <zhang...@gmail.com> 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? >>> >> >>> >> >>> >> >>> >> _______________________________________________ >>> >> Discuss-gnuradio mailing list >>> >> Discuss-gnuradio@gnu.org >>> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> >> > >> > >> > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
