Signal Processing Blocks in GRC

GNU Radio
1

Hi all,

I recently started to use Gnu Radio and I want to implement new signal
processing blocks in GRC so others could easily use them in a graphical
environment. Most common blocks are already available, however, some are
not…

Python is new to me, but I’m making progress. I understand the structure
of the example ‘howto-square-ff’ (at least I think so) and I know what
changes to make for my own blocks.

./configure
make
make install

don’t produce any errors.

The xml file for embedding into GRC seems to be quite easy. However,
when running the example in GRC I get the message:

NameError: global name ‘howto’ is not defined

On the other hand, if I change the example to have the package name ‘gr’
instead of ‘howto’ (I’ve changed the source code as well, my function is
called sub4_ff()), I get another message:

module’ object has no attribute ‘sub4_ff’

Here is my howto_square_ff.xml:

<?xml version="1.0"?> Square howto_square_ff Test from gnuradio import gr howto.test_square_ff() in float out float

Please help me with this, I already tried a lot!

I am using:

  • openSUSE 11.1 (64bit)
  • Gnu Radio 3.2.2
  • howto example 3.2

Thanks
Piotr