[time-nuts] Generate 1 PPS signal on serial port

[Mark C. Stephens]

Marki the "smart" search engine came back with:

Prof David Mills: http://www.eecis.udel.edu/~mills/ntp/html/pps.html Pulse-Per-Second (PPS) Signal Interfacing
Hardware: http://www.vk2hmc.net/blog/?p=583

If using Linux you need kernel version > 2.6.39.4 or version 3 kernel as the PPS interface is now included in the kernel.
Unless of course, low latency and jitter is not an issue for you ;)
You can use either parallel or serial PPS.

For windows see http://www.davehart.net/ for binaries.
David Taylor pretty much covers it here: http://www.satsignal.eu/ntp/NTP-on-Windows-Vista.html


--marki

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Eugen
Sent: Tuesday, 6 August 2013 9:47 AM
To: time-nuts at febo.com
Subject: [time-nuts] Generate 1 PPS signal on serial port

Probably this was asked before but in searches I only find how to use an external 1 PPS GPS signal for NTP synchronization.

Having a Linux/FreeBSD PC synchronized using NTP/chrony, what would be the best way of generating an output 1 PPS signal on a (hardware) serial port ?

For timing I've seen the standard libc functions from <sys/time.h>, like setitimer(), but maybe there are better ways for generating precise delays. 


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