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[Discuss-gnuradio] Guided Tutorials - Experience

From: Vlad Stoica
Subject: [Discuss-gnuradio] Guided Tutorials - Experience
Date: Mon, 20 Oct 2014 10:06:33 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.2.0


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.


Thank you in advance!

Best regards,

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