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

[Josh Blum]

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.

-josh

> 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
>>>
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