[PD] RPI4 GPIO

[Winfried Ritsch]

Maybe helpful :
 (for  100+ GPIOs if you need to drive solenoids or the like)

Once ago doing a robot player for xylophones I needed a lot of GPIOs and used 
the GPIO-monster Olimex-A20 (maybe compares with RPI3), and we at Atelier 
Algorythmics wrote a kernel driver for it and a pd externals using this.

- https://git.iem.at/pd/gpioASR

its general linux kernel stuff, still beta and we did not test it on other 
boards very much and did not get the time to enhance it ... 

Please inform me if anybody succeeds and open for suggestions, we want to 
develop it further for a new piayer piano electronics... 

mfg
   winfried


Am Freitag, 25. November 2022, 00:08:23 CET schrieb Ico Bukvic:
> Get Pd-L2Ork and use its K12 mode abstractions that include out-of-box RPi
> connectivity (see extra/K12 subfolder). Best paired with lots-of-pots RPi
> shield that gives you 8 channels of GPIO I/O (including  software PWM on
> all 8 channels or the usual hw PWM via dedicated hardware GPIO pins) and 8
> channels of analog input via SPI (needs to be enabled in /boot/config.txt
> and requires reboot once enabled).
> 
> Best,
> 
> Ico
> 
> > Latency might be problematic with realtime processes and in my case this
> > is not for realtime. You might be interested into realtime kernel used in
> > patchbox os for rpi. I've got jack+pd- nogui running with 2ms buffer and
> > no
> > xrun.
> > 
> > Le jeu. 24 nov. 2022, 18:38, Sebastian Lexer <s.lexer at incalcando.com> a
> > 
> > écrit :
> >> Hello,
> >> 
> >> are you not getting unreliable latency due to the local network
> >> connection between your gpios and pd processes and triggers?
> >> When I used this method previously, timings between gpio reading and pd
> >> receiving the udp packages varied between 5 to 15ms.
> >> 
> >> Patco wrote on 24/11/2022 15:51:
> >> > Hello,
> >> > 
> >> >   My actual favorite method to read/write GPIO ports is about using a
> >> 
> >> python script outside PureData and manage communication between the
> >> python
> >> script and PureData with UDP socket. This way there is no limitation on
> >> PureData side about how to handle GPIO, and this way makes possible
> >> management through other softwares or from another computer. It’s very
> >> easy
> >> and stable, and there are many examples about how to use sockets with
> >> python.
> >> 
> >> >> Le 24 nov. 2022 à 13:46, Simon Iten <itensimon at gmail.com> a écrit :
> >> >> 
> >> >> What is the *current* prefered method to read GPIO pins from within PD
> >> 
> >> on a raspberry pi 4?
> >> 
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-- 
- ao.Univ.Prof. DI Winfried Ritsch 
- ritsch at iem.at - http://iem.at/ritsch
- Institut fuer Elektronische Musik und Akustik
- University of Music and Dramatic Art Graz
- Tel. ++43-316-389-3510 (3170) Fax ++43-316-389-3171