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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