Adding python block to gnuradio

i made python block and want to add it to module in gnuradio, i open the
directory of the module and use gr_motool add -t source filename.py. the
tool created the .cc file and .h but as templates no processing done in
the files.
so can anyone advise me to add python block?

On Wed, Mar 13, 2013 at 5:57 AM, Mohammed R.
[email protected]wrote:

i made python block and want to add it to module in gnuradio, i open the
directory of the module and use gr_motool add -t source filename.py. the
tool created the .cc file and .h but as templates no processing done in the
files.
so can anyone advise me to add python block?

There’s a great tutorial here:
http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules

The gr_modtool work flow is that gr_modtool generates a lot of the
required
boilerplate code used by GR and then you edit those files with your
signal
processing code. Notice there’s section on python blocks in the tutorial
(Tutorial #3).

It sounds like you’ve already got your signal processing code done. I
would
suggest copying what you have in to the boiler plate code generated by
gr_modtool. An alternative is importing what you already have and edit
the
work: function to call what you already have.

Make sure you tell gr_modtool that you want to generate a python block
with
the -l switch. Going through that tutorial will be the single most
useful
thing in learning how to make a new block.

Hi Mohammed,

Nathan just beat me to it and as he said, this link explains more about
gr_modtool:

http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules

gr_modtool makes the template for you to paste your code into.

Here’s my methodology on how I do it:

  1. $ gr_modtool newmod
    (type in your project name)

  2. $ cd gr-

  3. $ gr_modtool add
    (you need to make a dummy c++ block before you can build the project and
    therefore to make a python template. pick ‘sync’ without any qa files.
    see:
    http://gnuradio.org/redmine/issues/522 for explanation)

  4. $ gr_modtool add -l python
    (this is where you make the python template, if in doubt pick the ‘sync’
    block)

  5. $ mkdir build && cd build && cmake …/ && make
    (look at the errors and you will see that the ‘<+’ and ‘+>’ need to be
    removed from the files in order for it to compile. When make works,
    ‘sudo
    make install’ will put your new project into action. don’t forget to
    reload
    GRC or hit the blue refresh button at the top. the GRC templates need
    to
    be edited too in order for them to turn into GRC icons)

Once you can compile the templates successfully, modify the files that
gr_modtool created by pasting in your code. Good luck :slight_smile:

Mike


Mike J. M0MIK BSc
Radio Communications Technology Specialist
Email: [email protected]
Web: http://www.scanoo.com

  1. step:

[email protected]:~$ gr_modtool.py create qpsk
Module directory is “./gr-qpsk”.
Creating directory…
Copying howto example…
Unpacking…
Replacing occurences of ‘howto’ to ‘qpsk’… Done.
Use ‘gr_modtool add’ to add a new block to this currently empty module.
[email protected]:~$ gr_modtool.py add
No GNU Radio module found in the given directory. Quitting.

  1. step:

[email protected]:~$ cd gr-qpsk

  1. step:

[email protected]:~/gr-qpsk$ gr_modtool.py add
Operating in directory .
GNU Radio module name identified: qpsk
Enter code type: sync
Language: C++
Enter name of block/code (without module name prefix): QPSK
Block/code identifier: QPSK
Enter valid argument list, including default arguments: int val1, double
val2=0
Add Python QA code? [Y/n] n
Add C++ QA code? [Y/n] y
Traversing lib…
Adding file ‘QPSK_impl.h’…
Adding file ‘QPSK_impl.cc’…
Adding file ‘QPSK.h’…
Adding file ‘qa_QPSK.cc’…
Adding file ‘qa_QPSK.h’…
Traversing swig…
Editing swig/qpsk_swig.i…
Traversing grc…
Adding file ‘qpsk_QPSK.xml’…
Editing grc/CMakeLists.txt…

  1. step:

[email protected]:~/gr-qpsk$ gr_modtool.py add -l python
Operating in directory .
GNU Radio module name identified: qpsk
Enter code type: sync
Language: Python
Enter name of block/code (without module name prefix): QPSK
Block/code identifier: QPSK
Enter valid argument list, including default arguments: int val1, double
val2=0
Add Python QA code? [Y/n] y
Traversing python…
Adding file ‘QPSK.py’…
Adding Python QA…
Adding file ‘qa_QPSK.py’…
Editing python/CMakeLists.txt…
Traversing grc…
Adding file ‘qpsk_QPSK.xml’…
Editing grc/CMakeLists.txt…

before 5th step i had removed <+ your compan… +> then

  1. step:

[email protected]:~/gr-qpsk$ mkdir build && cd build && cmake …/ && make
– The CXX compiler identification is GNU 4.7.2
– The C compiler identification is GNU 4.7.2
– Check for working CXX compiler: /usr/bin/c++
– Check for working CXX compiler: /usr/bin/c++ – works
– Detecting CXX compiler ABI info
– Detecting CXX compiler ABI info - done
– Check for working C compiler: /usr/bin/gcc
– Check for working C compiler: /usr/bin/gcc – works
– Detecting C compiler ABI info
– Detecting C compiler ABI info - done
– Build type not specified: defaulting to release.
– Boost version: 1.49.0
– Found the following Boost libraries:
– filesystem
– system
– Found PkgConfig: /usr/bin/pkg-config (found version “0.26”)
– checking for module ‘gruel’
– found gruel, version 3.6.4
– Found GRUEL: /usr/local/lib/libgruel.so
– checking for module ‘gnuradio-core’
– found gnuradio-core, version 3.6.4
– Found GNURADIO_CORE: /usr/local/lib/libgnuradio-core.so
– checking for module ‘cppunit’
– found cppunit, version 1.12.1
– Found CPPUNIT: /usr/lib/libcppunit.so;dl
– Found SWIG: /usr/bin/swig2.0 (found version “2.0.7”)
– Found PythonLibs: /usr/lib/python3.2/config/libpython3.2.so (found
version “2.7.3”)
– Found PythonInterp: /usr/bin/python (found version “2.7.3”)
– Found Doxygen: /usr/bin/doxygen (found version “1.8.1.2”)
– Configuring done
– Generating done
– Build files have been written to: /home/bynkln/gr-qpsk/build
Scanning dependencies of target gnuradio-qpsk
[ 5%] Building CXX object
lib/CMakeFiles/gnuradio-qpsk.dir/QPSK_impl.cc.o
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc: In constructor
gr::qpsk::QPSK_impl::QPSK_impl(int, double):
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:30: error: expected
primary-expression before < token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:32: error: MIN_IN was not
declared in this scope
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:39: error: expected
primary-expression before > token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:40: error: expected
primary-expression before , token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:42: error: expected
primary-expression before < token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:44: error: MAX_IN was not
declared in this scope
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:51: error: expected
primary-expression before > token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:52: error: expected
primary-expression before , token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:62: error: expected
primary-expression before < token
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:64: error: expected
primary-expression before float
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:64: error: expected ) before
float
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:67:3: error: expected { before }
token
make[2]: *** [lib/CMakeFiles/gnuradio-qpsk.dir/QPSK_impl.cc.o] Error 1
make[1]: *** [lib/CMakeFiles/gnuradio-qpsk.dir/all] Error 2
make: *** [all] Error 2
[email protected]:~/gr-qpsk/build$

then gived to me error like this, again… what shoul i do, thank you.

2013/3/13 Mike J. [email protected]

The best way to mke a new block is by following
tutorial here:
http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules.
you can easily make duumy block from this tutorial. i also made square
dummy block from this tutorial.by making your block available in
gnuardio you have to create the xml files whose procedure is also given
in this tutorial.
— On Wed, 3/13/13, Mohammed R. [email protected] wrote:

From: Mohammed R. [email protected]
Subject: [Discuss-gnuradio] adding python block to gnuradio
To: [email protected]
Date: Wednesday, March 13, 2013, 10:57 AM

i made python block and want to add it to module in gnuradio, i open the
directory of the module and use gr_motool add -t source filename.py. the
tool created the .cc file and .h but as templates no processing done in
the files.
so can anyone advise me to add python block?

-----Inline Attachment Follows-----

How should i add or replace c++ code and python code could you explain
it
with an example, and i knew there is psk.py code but need to show it at
the
GRC as a block.

You simply open that file in text editor and change the lines that cause
trouble.

On Thu, Mar 14, 2013 at 2:58 AM, Serhat BOYNUKALIN
[email protected] wrote:

[email protected]:~$ gr_modtool.py add
No GNU Radio module found in the given directory. Quitting.

As the error message indicates this last command didn’t do anything.

Enter code type: sync
Adding file ‘qa_QPSK.cc’…
[email protected]:~/gr-qpsk$ gr_modtool.py add -l python
Adding Python QA…
Adding file ‘qa_QPSK.py’…
Editing python/CMakeLists.txt…
Traversing grc…
Adding file ‘qpsk_QPSK.xml’…
Editing grc/CMakeLists.txt…

before 5th step i had removed <+ your compan… +> then

From http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules
The C++ code (part 1)

“gr_modtool hints at where you have to change code by adding <++>
symbols.”

– Check for working C compiler: /usr/bin/gcc
– found gruel, version 3.6.4
– Found Doxygen: /usr/bin/doxygen (found version “1.8.1.2”)
/home/bynkln/gr-qpsk/lib/QPSK_impl.cc:42:42: error: expected primary-expression
before < token
[email protected]:~/gr-qpsk/build$

then gived to me error like this, again… what shoul i do, thank you.

Look at those line numbers that give errors. You need to replace the
“<++ hint ++>” with actual C++ code.

As a side note, unless you’re doing something fancy there’s already a
QPSK modulator/demodulator that comes with GR as a python hier_block.
It’s in gr-digital/python/psk.py .

-Nathan

On Thu, Mar 14, 2013 at 4:27 AM, Serhat BOYNUKALIN
[email protected] wrote:

it is possible to add qpsk as a block to grc just using python code?

It’s already there. Search for PSK Modulator. M is the variable to
change the modulation order. 4 will give you PSK.

2013/3/14 Nemanja S. [email protected]

How should i add or replace c++ code and python code could you explain it with
an >> example

I can’t stress this enough.
If you want to learn how to create a new block you should go through
the tutorial.
http://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModules

The tutorial shows you what the changed code should look like for a
very simple block. It’s a very good tutorial and it won’t take you
more than an hour, which is probably more time than you’ve spent
trying to fix problems that you wouldn’t have if you go through the
tutorial.

In the terminal transcript you provided, you created an block without a
name, and after that you created a python block. One of the errors comes
from the first block. I am not sure where you have found this sequence
of
actions, but the only thing you should to to create a new signal
processing
block is to firsr, define a module, which you have done, second, add a
new
signal processign block (in python or C++), EDIT the files created by
gr_modtool in order to implement the behaviour of your block, third: do
make and make test to see whether your block really does what you
wanted,
make xml file for GRC and finaly do make install, and you will be able
to
use it.

On Thu, Mar 14, 2013 at 10:27 AM, Serhat BOYNUKALIN <

it is possible to add qpsk as a block to grc just using python code?

2013/3/14 Nemanja S. [email protected]

Ok, but just a little.

On Thu, Mar 14, 2013 at 10:47 AM, Serhat BOYNUKALIN <

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