Yo Achim! On Tue, 23 Jan 2018 22:26:07 +0100 Achim Gratz via devel <devel@ntpsec.org> wrote:
> Gary E. Miller via devel writes:
> > Sure it does. gpsd works with the /dev/ppsX devices, which are
> > kernel timestamped. I use that on all my RasPi GPS.
>
> Yeah. Now show me how you can get more than one GPIO connected to a
> /dev/pps*,
Dunno, it just works automagically for me:
# ls /dev/pps*
/dev/pps0 /dev/pps1
I plug in two USB GPS and I get two PPS. Similar for RS-232 serial
ports.
> expecially on the raspberryPi where neither a serial device
> or printer port can provide additional PPS inputs.
Which is why on my RasPi i use GPIO pins. I know you can use both
GPI 4 and 18 for PPS. I suspect that any and all of the RasPi GPIO
pins can work fine.
> Agai, the problem
> is not using multiple such devices, it's with actually getting them
> configured in the kernel.
How about this on a RasPi:
# Uptraonics on gpio 18
dtoverlay=pps-gpio,gpiopin=18
# adafruit HAT
dtoverlay=pps-gpio,gpiopin=4
I use them both, never tried at the same time.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can’t measure it, you can’t improve it." - Lord Kelvin
pgpqJ_l09ALOH.pgp
Description: OpenPGP digital signature
_______________________________________________ devel mailing list devel@ntpsec.org http://lists.ntpsec.org/mailman/listinfo/devel
