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

Eugen eugen at lavabit.com
Tue Aug 6 11:58:38 UTC 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.

Thanks, I'll check the documentation.




More information about the Time-nuts_lists.febo.com mailing list