[ntp:questions] 1pps signal,20us width

Fei Wu fxw115 at yahoo.com
Wed Nov 24 17:34:45 UTC 2004

Thanks for all your kind information. I finally got
the pps signal with 20us pulse width worked. It is not
about the pulse width as most of you indicated. It is
because the kernel does not support hardpps. I also
found it in the code. The problem is: for some
reasons, the flag3 1 did not turn the switch on. I
tried PPS_SYNC and rebuilt the kernel, it works then.


--- David Schwartz <davids at webmaster.com> wrote:

> "Fei Wu" <fxw115 at yahoo.com> wrote in message 
news:mailman.1.1100548101.54146.questions at lists.ntp.isc.org...
> > refclock_atom: time_pps_kcbind failed: Operation
> not
> > supported.
> > I checked the code refclock_atom.c, but I did not
> find
> > details about time_pps_kcbind function.
> >
> > Does the error confirms that the pulse is too
> short
> > for my machine?
>     No, this means your kernel does not support
> hardpps (where the kernel 
> automatically locks its own PLL onto the PPS input).
>     DS
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