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Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty
From: |
Hal Murray |
Subject: |
Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty |
Date: |
Fri, 22 Apr 2016 05:57:45 -0700 |
>> Both are triggering on the rising edge.
> I want to be very sure I know what you're asserting here. Are you saying
> that you *know* the pps-gpio driver reports the leading edge in both cases?
> While this is certainly plausible I'd like to know your authority for it.
> It's a crucial, delicate point on which I would hate for us to inadvertently
> spread misinformation.
I was claiming that both devices are doing the right thing with the current
broken kernel that doesn't support the falling/clear edge.
I just verified with a scope that the PPS pulse from an Adafruit HAT is 100
ms wide and starts with a rising edge.
I have an old Uputronics, but it's tie wrapped up on a shelf where I can't
easily get a scope probe on it. They use uBlox. I'm not sure which one. It
is unlikely to make any difference.
> The default pulse width should be in the data sheets.
I couldn't find it. Grumph. So change that to "will be in good data sheets."
--
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- [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Eric S. Raymond, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Hal Murray, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Phil Salkie, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Eric S. Raymond, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Hal Murray, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Gary E. Miller, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Phil Salkie, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Gary E. Miller, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Paul Fertser, 2016/04/23
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Gary E. Miller, 2016/04/22
- Re: [gpsd-dev] SemPiTernal - Bounding PPS uncertainty, Phil Salkie, 2016/04/22