NMEA refclock

dropkick23 at gmail.com dropkick23 at gmail.com
Thu Dec 3 03:08:05 UTC 2020

I know the 'magic' to release /dev/ttyAMA0 and BT.

Found the error in ntpd.log
 NMEA(0) serial /dev/gps0 open at 4800 bps

in the driver documentation the default is 9600.  but is being opened at
"The driver uses 9600 bps by default, unless NTPsec was built in Classic
strict-compatibility mode, in which case the old default of 4800 bps is

here is my configure:
./waf configure --refclock=nmea,pps,local,generic,shm --prefix=/usr

I'll set the baud rate in ntp.conf.
Thanks for pointing me in the right direction


On Wed, Dec 2, 2020 at 7:42 PM Hal Murray via users <users at ntpsec.org>

> > are the default paths /dev/gps0 and /dev/gpspps0?  links are
> /dev/ttyAMA0 and
> > /dev/pps0
> There should be an error message if it can't open the file.
> There should be a message if it opens the file telling you the baud rate.
> Sample:
>   16 Nov 00:40:41 ntpd[514]: NMEA(0) serial /dev/ttyAMA0 open at 9600 bps
> There is some magic you have to go through to get /dev/ttyAMA0 away from
> the
> system console or bluetooth or something like that.   There are several
> web
> pages describing the details.  I'll fish out a URL if you can't find one.
> --
> These are my opinions.  I hate spam.
> _______________________________________________
> users mailing list
> users at ntpsec.org
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