Seems like you already understand the limitations! Good luck with you project!
--Albin On Mon, Jun 22, 2020, 14:30 jean-michel.fri...@femto-st.fr < jean-michel.fri...@femto-st.fr> wrote: > The envisioned application is event driven: send a control word from a > client, > wait for the even to complete (e.g. move antenna to target position), start > streaming data for a given amount of time, and when enough data is > collected move > to new position. Of course timing cannot be relied on with a non-real time > multitasking > operating system whose load is not predictable. > > I did use successfully Python Module to implement the server and tune the > UHD parameters > during the week end without editing the Python code (why the Python Module > must be entered > through the GRC Python editor and not externally for the updates not to be > lost is still > not yet understood). Will have a look at this new Python Snippet feature. > > Thanks, JM > > -- > JM Friedt, FEMTO-ST Time & Frequency/SENSeOR, 26 rue de l'Epitaphe, > 25000 Besancon, France > > June 22, 2020 2:05 PM, "Albin Stigö" <albin.st...@gmail.com> wrote: > > > 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 > >>> > >>> >
