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Re: [Discuss-gnuradio] timed command

From: Gong Zhang
Subject: Re: [Discuss-gnuradio] timed command
Date: Tue, 05 Mar 2013 09:10:56 +0800
User-agent: Mozilla/5.0 (Windows NT 6.1; rv:17.0) Gecko/20130215 Thunderbird/17.0.3

Thank you for your reply.And this may lead to ambiguous. The streaming data will totally work independent of the backpressure or it will be backpressure untill the command queue is full?

2013/3/5 1:26, Josh Blum wrote:

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.


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


Attached is a simple freq-hopping example using timed-commands.
  U may need to change "freq_list " that should match ur RF-Daughter


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:
I wanna transmit a 1khz Sinusoidal signal for one second and
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
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.


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