[ntp:questions] Fwd: Re: NetBSD GPS/PPS using 4.2.6p3
agcarver+ntp at acarver.net
Tue Aug 23 17:59:56 UTC 2011
On 8/23/2011 08:49, Terje Mathisen wrote:
> A C wrote:
>> The duty cycle is about 10% (100ms on 900ms off). I'll try tossing in
> This is pretty much perfect.
>> the pulse stretcher and/or inverter just after the GPS receiver and see
>> what happens.
> Won't help probably. :-(
At the very least I'll toss an inverter in there and see if the pulse is
just upside down. The timing I did quickly by eye and stopwatch (I have
an LED attached to the PPS pin) but I don't remember if I had to wire
the LED to V+ or ground to have it stay off for most of the time. If
it's wired to V+ then the pulse is inverted and have to try the inverter.
If that doesn't work then I've run out of possibilities other than very
broken code somewhere. I still don't understand why the debugging code
pps-api supplied in ntpd's own sources can find this pulse via the
kernel but ntpd can't.
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