Re: [Discuss-gnuradio] Absolute time reception through pythoninterface

[Nicholas Lan]

Dear Josh,

Thanks for your reply. Does this mean that there is no method to implement
the C++ recv and stream commands using an absolute start time in the
currently implemented gnuradio python api?

Regards
Nicholas Lan

  
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-----Original Message-----
From: address@hidden
[mailto:address@hidden On
Behalf Of Josh Blum
Sent: 11 November 2011 16:01
To: address@hidden
Subject: Re: [Discuss-gnuradio] Absolute time reception through
pythoninterface



On 11/11/2011 04:23 AM, Nicholas Lan wrote:
> Hello, 
> 
>  
> 
> I am able to use UHD C++ code to have an ettus device record data at a
> specified absolute time. I am trying to implement this functionality in
> python. I have read in a discussion topic that the recv command used in
C++
> to start receiving at a specified absolute time is not implemented through
> SWIG in gnuradio and that gnuradio scheduler should be used instead. I
have
> looked through the code files including 'scheduler' in gnuradio as well as
> gr_flat_flowgraph and can't see how to implement an absolute timed start
> through these codes. I also looked at gr_timer but read that this is not
> currently fully implemented. Could someone point me in the right direction
> in terms of starting reception at a specified absolute time through
> gnuradio/grc please?
> 
>  

If you use my next branch you can write blocks in python. All facilities
of tags and message passing are available in python:
http://gnuradio.org/redmine/projects/gnuradio/wiki/WriteBlocksInPython

Also, look at gr-uhd/examples/tags_demo.cc for an example of how to
intercept and use the tags.

-josh

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