[ntp:questions] Re: Linux PPS triggering with NMEA

David Schwartz davids at webmaster.com
Mon May 9 20:31:00 UTC 2005


"Ulrich Windl" <Ulrich.Windl at RZ.Uni-Regensburg.DE> wrote in message 
news:86vf5smv3l.fsf at pc8032.rz.uni-regensburg.de...

> "MarkO" <orzech at nps.edu> writes:

>> We're currently running ntp version 4.1.1 at 1.786 on linux kernel version
>> 2.4.18-4.  We have a Garmin NMEA GPS connected to the serial port and
>> sending a (default) 100ms PPS pulse on pin #1.

>> I have a couple very basic questions.  First, do we need to install
>> PPSkit in order to synchronize with the Garmin's PPS pulse?  And, if
>> so, can we use PPSkit 2.0.2 (for linux kernel 2.4.19) with our current
>> kernel, or do we need to upgrade the kernel as well?

> I think you'll need the PPSkit, and a new kernel is strongly recommended 
> for a
> variety of security reasons.

    You don't need the PPSkit because Linux TIOCMIWAIT. However you will get 
better accuracy with the PPSkit. 
http://www.webchat.org/~jk/shm_linux_clock.c

    DS





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