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Re: [Discuss-gnuradio] Guided Tutorials - Experience

From: Martin Braun
Subject: Re: [Discuss-gnuradio] Guided Tutorials - Experience
Date: Mon, 20 Oct 2014 13:37:55 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.6.0


thanks for going through the guided tutorials, and thanks for your
feedback. We'll address those soon and fix the tutorials.

As for your solution, I'm not sure. I recommend putting a couple of
print statements so you can tell what's going on.


On 10/20/2014 10:06 AM, Vlad Stoica wrote:
> Hello,
> I did 2 of the Guided Tutorials - Programming GNU Radio in Python and
> C++ and want to tell you about my experiences.
> First thanks for making this tutorials! They really help me to get a
> good start with GNU Radio.
> Tutorial with Python: Since I don t have any programming experience in
> Pyton (and C++) I really liked it that it is very detailed! Could do it
> and understand everything!
> Tutorial with C++: Really had problems doing this tutorial. I must admit
> that my C++ knowledge is very low.
> - In the tutorial there is just written to edit the and how to edit the
> .cc file. But in the header there are also things to be edited.
> - After declaring the function get_minimum_distances in header file and
> trying to compile (make) I get the error: unknown variable d_gray_code.
> So I guess in the .cc file there has to be done some assignment like
> d_gray_code =  gray_code ?
> - After doing some editings in header and .cc file I managed to compile.
> - To prevent any errors I copied the given (on the tutorial page) .xml
> code into my .xml file. After cmake ../  --> make --> sudo make install
> --> sudo ldconfig --> restart GRC --> new block did not appear ?
> - Maybe it s because the last 6 lines of xml file ? There appear
> </block> 2 times. After editing the file made by gr_modtool with the
> instructions it worked :-)
> But after having done a QA test as it is written on the tutorial I get
> wrong results (AssertError). Seems that although I call
> qpsk = tutorial.my_qpsk_demod_cb(gray_code) with gray_code = false
> The code just enters the if clause with gray_code == true?
> Do you have any idea why? Here are my files, which are nearly the same
> as the ones in examples.
> https://dl.dropboxusercontent.com/u/33858807/my_qpsk_demod_cb_impl.cc
> https://dl.dropboxusercontent.com/u/33858807/my_qpsk_demod_cb_impl.h
> https://dl.dropboxusercontent.com/u/33858807/qa_my_qpsk_demod_cb.py
> Thank you in advance!
> Best regards,
> Vlad
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