In message <[EMAIL PROTECTED]>, "Steve
Rooke" writes:
>2008/10/2 Bruce Griffiths <[EMAIL PROTECTED]>:
>
>> Save yourself a counter and just divide the frequency down to about 1Hz
>> and time stamp the 1Hz transitions with the Linux box.
>> As long as you know the division factor its easy enough to calculate the
>> frequency.
>
>I'd planned on a simple interface to the PC via using the parallel,
>suitably strapped, as a basic output port. Now, I could use it as an
>input but I'd probably have to poll the port which would be somewhat
>inefficient [...]
Linux should have the PPS-API from RFC2783 so that should be piece
of cake to do.
I know that it works in FreeBSD (guess who wrote it :-) where you can
just:
cd /usr/sc/tools/test/ppsapi
make
./ppsapitest /dev/lpt0
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
[EMAIL PROTECTED] | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
_______________________________________________
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
