Re: Edit/gpiomon: Question about mode

[Kent Gibson <warthog618@gmail.com>]

On Mon, Mar 28, 2022 at 07:13:13PM +0200, Hans Kurscheidt wrote:
> 
> Am 28.03.2022 um 15:16 schrieb Hans Kurscheidt:
> > Hi,
> > 
> > what would be the right mode for gpiomon call from
> > 
> > a shellscript executed as root from systemd at system start
> > 
> > waiting on a Pin w/ pullup for invoking shutdown upon rising* edge.  
> > *changed
> > 
> > 
> > Lots of interupts, Signals and other GPIO ongoing from other user APPs &
> > threads in multi-user state.
> 
> 2b more precise: I wired a GPIO Pin to GND.
> 
> Upon the cmd: sudo gpiomon -r -n1 <chip> <offset>
> 
> the program exits immediately with 1 event, although there was never a
> rising edge due to the fix wire to GND. Is this a feature or a bug, and is
> it reproducible?
> 

Not a feature and not reproducible for me on a Raspberry Pi4 with the
setup you describe, so probably a bug specific to your hardware platform,
whatever that may be.

If it is 100% reproduceable for you, and assuming it is an initialisation
issue so you only get the one spurious event, how about using -n2 as a
workaround ;-)?

Cheers,
Kent.