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

Hal Murray hmurray at megapathdsl.net
Mon Aug 5 20:29:29 EDT 2013


> 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 ? 

I haven't tried it.


On Linux, /drivers/pps/generators/Kconfig (from kernel-devel or kernel 
sources) says:

# PPS generators configuration
#

comment "PPS generators support"

config PPS_GENERATOR_PARPORT
        tristate "Parallel port PPS signal generator"
        depends on PARPORT && BROKEN
        help
          If you say yes here you get support for a PPS signal generator which
          utilizes STROBE pin of a parallel port to send PPS signals. It uses
          parport abstraction layer and hrtimers to precisely control the 
signal.

Documentation/pps/pps.txt (from kernel-doc) has a section on that.


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