It might be difficult to control GPIO with precise timing on raspberry pi depending on what you want to do... A few hundred khz might be ok though. libgpiod is the new better Linux GPIO API.
--Albin On Mon, Jun 22, 2020, 13:25 Marcus Müller <muel...@kit.edu> wrote: > 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 > > > > > >
