Re: 3.9 Setup for OOT development

[Gavin Jacobs]

@Criss Swaim - you were partly right. The problem was in the yml file, but not because I skipped that makeyaml step. The 'gr_modtool add' step provides a template yml file, which is a better starting point than the output of  'gr_modtool makeyaml'. The output of the latter does not include the "templates" section.

So, I used the instructions found here

https://wiki.gnuradio.org/index.php/YAML_GRC#Templates

and here

https://wiki.gnuradio.org/index.php/Guided_Tutorial_GNU_Radio_in_C%2B%2B#Step_4_bis:_Flesh_out_the_YAML_file

That made some progress! Now I can get the module/block onto the flowgraph and connect the inputs & outputs. 

But when I try to execute the flow graph I get this error:

Generating: '/home/gavin/GNU_Stuff/GRC/U39/U39.py'

Executing: /usr/bin/python3 -u /home/gavin/GNU_Stuff/GRC/U39/U39.py

Warning: failed to XInitThreads()

Traceback (most recent call last):

  File "/home/gavin/GNU_Stuff/GRC/U39/U39.py", line 35, in <module>

    import tooltest

ModuleNotFoundError: No module named 'tooltest'

Note: the XInitThreads happens all the time and other flowgraphs work fine inspite of it.

Next I compared my yml file (see below) to the in-tree ABS block and discovered that all the gnuradio blocks have a  new keyword "flags" and a new section called "cpp_templates:", so I copied those to my file. But of course, that didn't help because it points to the location of the gnuradio modules/blocks, and I need to edit it - but I don't quite see what I should put in there.

So, questions:

• anyone have an example yml file of an OOT module/block for 3.9?
• what do the "flags" mean?
• what should I put in the "cpp_template" section?

Thanks,

Gavin

Here is my yml file:

id: tooltest_wire

label: wire

category: '[tooltest]'

flags: [ python, cpp ]

templates:

  imports: import tooltest

  make: tooltest.wire(${k})

cpp_templates:

  includes: ['#include <gnuradio/blocks/tooltest_wire.h>']

  declarations: 'blocks::tooltest_wire:sptr ${id};'

  make: 'this->${id} = blocks::tooltest_wire::make(${k});'

#  Make one 'parameters' list entry for every parameter you want settable from the GUI.

#     Keys include:

#     * id (makes the value accessible as keyname, e.g. in the make entry)

#     * label (label shown in the GUI)

#     * dtype (e.g. int, float, complex, byte, short, xxx_vector, ...)

parameters:

- id: k

  label: Scale Factor

  dtype: float

  default:  '1'

#  Make one 'inputs' list entry per input and one 'outputs' list entry per output.

#  Keys include:

#      * label (an identifier for the GUI)

#      * domain (optional - stream or message. Default is stream)

#      * dtype (e.g. int, float, complex, byte, short, xxx_vector, ...)

#      * vlen (optional - data stream vector length. Default is 1)

#      * optional (optional - set to 1 for optional inputs. Default is 0)

inputs:

-   label: in

    domain: stream

    dtype: float

outputs:

-   label: out

    domain: stream

    dtype: float

   

#  'file_format' specifies the version of the GRC yml format used in the file

#  and should usually not be changed.

file_format: 1

Guided Tutorial GNU Radio in C++ - GNU Radio

Note: the get_minimum_distances function declaration also needs to be added to the class header (my_qpsk_demod_cb_impl.h).The function get_minimum_distances is a maximum likelihood decoder for the QPSK demodulater. Theoretically, the function should compute the distance from each ideal QPSK symbol to the received symbol (It is mathematically equivalent to determining the Voronoi regions of the ...

wiki.gnuradio.org

YAML GRC - GNU Radio

Starting with release 3.8, YAML replaces XML as the file format for GNU Radio Companion. This is triggered by switching from Cheetah to Mako as the templating engine, since Cheetah does not support Python 3.

wiki.gnuradio.org