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Re: [Discuss-gnuradio] Creating signal processing blocks in Python on Wi

From: Tomas Johansson
Subject: Re: [Discuss-gnuradio] Creating signal processing blocks in Python on Windows
Date: Mon, 13 Aug 2012 13:40:29 +0200

Thank you for your help! It seems that the problem is with my gnuradio
installation in general rather than with my signal processing block
implementation. When I add an Extras:divide block to an existing
example in grc everything works fine, but when I add an
Extras:packetframer block (which is implemented in Python) to the same
example it crashes when the python script specifies how the blocks are
connected, right before the

self.connect((self.gr_null_source_2, 0), (self.extras_packet_framer_0, 0))

line. I get some Traceback written to the wxPython window, but
unfortunately it closes before I can see what it says.

I have added the gnuradio\lib\site-packages and
gnuradio\lib\site-packages\gnuradio directories to my PYTHONPATH.

Any further help would be most appreciated.


On Fri, Aug 10, 2012 at 7:15 PM, Josh Blum <address@hidden> wrote:
> On 08/10/2012 07:48 AM, Tomas Johansson wrote:
>> Hi all,
>> I have recently installed GNU Radio on Windows according to the
>> instructions at
>> http://code.ettus.com/redmine/ettus/projects/uhd/wiki/GNURadio_Windows,
>> and have played around with some simple examples in GNU radio
>> companion. No problems there. But I am not sure which steps you should
>> take in order to be able to use blocks you have written yourself in
>> Python (using GrExtras) in radio companion. Modifying/adding xml files
>> in share/gnuradio/grc/blocks seemed to add my new block to the list of
>> available blocks, but when I try to execute I get the message
>> Win32; Microsoft Visual C++ version 10.0; Boost_104700; 
>> UHD_003.004.003-release
>> Using Volk machine: sse2
> The above 2 are typical prints from libvolk and libuhd, thats good.
>> and nothing else happens. I have not been able to find an answer in
>> the online documentation. I apologize in advance for the basic
>> question.
> You should really only need to put the block into your PYTHONPATH, you
> know, so that you can import it using the python interpreter.
> As far as GrExtras, I havent used it on windows. Just made sure it
> builds and unit tests pass. Have you built/installed GrExtras from
> source? Set PATH and PYTHONPATH? Able to use and call into blocks from
> this project?
> As far as the error above, is it freezing there? returning to the
> terminal? It could be a segfault. It would be very helpful to find out
> what the last line in the python app was before the app got to that
> state. Was it run()/start()?
> -Josh
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