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Re: 回复: [USRP-users] Is there a "trigger" in GNURadio with USRP?

From: Marcus D. Leech
Subject: Re: 回复: [USRP-users] Is there a "trigger" in GNURadio with USRP?
Date: Mon, 02 Aug 2021 23:51:18 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 08/02/2021 09:48 PM, ZHOU Yuxuan wrote:

Thanks for your reply.


Actually I need the human triggered function in GnuRadio but I just do not know how to do that… thanks for your help.

If you took Gnu Radio and radios out of the picture, and the question was "how do I trigger something to happen when I press a certain key on the
  keyboard, or press a button of some sort?" is solving THAT problem something that is easy for you?  If the answer is a decided NO, then
  you may need to gain more experience in general software design FIRST before wandering into the abstruse disciplines of signal processing
  and radios.

if the answer is instead "not a problem, I already know how to do that", then I suggest that you spend some time with the Gnu Radio tutorials.
  it should come as no surprise that Gnu Radio, being what amounts to just a specialized programming environment, hasn't necessarily already
  come up with everything you might want to do in a nice tidy package.  Some programming will be required.

From your e-mail address I assume that you're a student. it may not have occurred to you this early in your software career that the set
  "useful things someone might want to do with a computer" and "useful things someone might want to do with radios" are very very large
  (if not infinite) sets.  Which means that from a practical perspective "some programming will likely be required" is almost always the answer.

I've cross-posted to discuss-gnuradio because there may be an audience there who have already done something similar to what you want and
  may ask more clarifying questions.



发件人: Marcus D Leech <patchvonbraun@gmail.com>
发送时间: 202183 3:52
收件人: ZHOU Yuxuan <yzhoudo@connect.ust.hk>
抄送: USRP-users@lists.ettus.com
主题: Re: [USRP-users] Is there a "trigger" in GNURadio with USRP?


It depends on what sort of latency you need in the trigger. Given that it is human triggered I’m guessing fairly sloppy. 


If it could be a keyboard key and you don’t need microsecond scale latency, then this is all doable in software/GnuRadio and you should probably post your question on the discuss-gnuradio mailing list since an implementation of this would be largely independent of radio hardware. 

Sent from my iPhone

On Aug 2, 2021, at 8:26 AM, ZHOU Yuxuan <yzhoudo@connect.ust.hk> wrote:

Hello everyone.


I am using USRP N210 and Gnuradio 3.7. I want a trigger like a button that only when I push the button then the USRP start to transmit the sample from file source. I did not find any materials or experience from other about this case.


The reason I want to do this is that the transmission is correlated to the human motion so I need to control the timing.


Is there anyone know how to implement this fuction?




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