[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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