It gets even better:

We've launched a feature in 3.8.1.0 (and on master before that, as we do with any feature that ends up in a maintenance release) that we hope doesn't come back to bite us due to enabling unclean design. But, we must build best practices so that it doesn't go unused, either, so:

Assuming you're using GNU Radio 3.8.1.0 (or later, once we release something), you can make use of the "Python Snippets" in GRC.

Cheers,
Marcus

On 18/06/2020 23.17, Marcus D. Leech wrote:
On 06/18/2020 03:54 PM, jean-michel.fri...@femto-st.fr wrote:
My approach:
* build your grc chart from GNU Radio Companion and generate the .py file
* edit the py file and import pygpio
* play with the RPi4 GPIO in your python script.

See attached script, with a python server included in the Python script
to control an RF switch from a GNU Octave TCP/IP client talking to the Python
TCP/IP server.

I am presenting this approach to hardware control at
http://jmfriedt.free.fr/sdra_radar.pdf

JM
If you use "Python Module" block, you can write a lot of non-GnuRadio-esque python, import anything you want, etc, etc.  No editing
   of the output python required, necessarily.



--
JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe,
25000 Besancon, France

June 18, 2020 9:40 PM, "Da Fy" <diver86...@gmail.com> wrote:

Hi All, does anyone have an example of how to control GOIO lines on the RPi4 from within a GRC
flowgraph. I’m guessing it’s an OOT module.

I need to generate a signal of a few 100Hz & control GPIO lines at various points though the cycle.

Alternatively, I could generate the signal & lines with external hardware & read them with
GnuRadio.

Tnx, Dave



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