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Re: [Discuss-gnuradio] timed command

From: Gong Zhang
Subject: Re: [Discuss-gnuradio] timed command
Date: Mon, 04 Mar 2013 20:18:13 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130215 Thunderbird/17.0.3

 2013/3/4 15:56, Josh Blum wrote:

On 03/03/2013 09:28 PM, Gong Zhang wrote:
I wanna transmit a 1khz Sinusoidal signal for one second and transmit
2khz for another second.The code maybe something like this:
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):

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.


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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