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

From: Josh Blum
Subject: Re: [Discuss-gnuradio] Creating signal processing blocks in Python on Windows
Date: Mon, 13 Aug 2012 17:30:18 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120714 Thunderbird/14.0

On 08/13/2012 04:40 AM, Tomas Johansson wrote:
> 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))

Its probably an error about matching IO types. The packet framer is
tectonically supposed to input messages and output a byte stream. It
could be fed by a stream_to_blob block for example


> 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.
> Regards,
> Tomas
> 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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