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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 18:53:09 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120714 Thunderbird/14.0

On 08/13/2012 05:30 PM, Josh Blum wrote:
> 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

Thank you guys for the many off-list replies. I was indeed thinking
about the earth's crust when I wrote this response.


> could be fed by a stream_to_blob block for example
> -josh
>> 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
>>> _______________________________________________
>>> Discuss-gnuradio mailing list
>>> address@hidden
>>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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