Hello,
On 06.08.2013 17:25, Chris Albertson wrote:
The current Linux kernel has a PPS GENERATOR. See "pps_gen_parport"
Put WHY would you need this? The documentation for pps_gen_parport suggests
only using it for crude synchronization of sevel computers but NTP would in
every case work better for that purpose.
But for whatever reason Linux does PPS in both directions
Be warned that any software PPS gignal will not be great, expect a few
microseconds or error
There are applications for that... I had to do that some time ago, since
I was required to send a PPS signal aligned to UTC, and a time-stamp of
this PPS signal using MIL-1553 (surely this is familiar to some people
in the list). The time was the UTC time at the computer (well, in this
case an embedded one, ntp sync'd through LAN). Since at that time (not
that long ago) there was not a pps generator available in the linux
kernel, I developed a small kernel module to drive an ouput pin. It
worked nicely enough, with a few microseconds of error - completely
tolerable in that application.
Regards,
Javier
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