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Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3
From: |
Eric S. Raymond |
Subject: |
Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3 |
Date: |
Sat, 23 Apr 2016 08:51:22 -0400 |
User-agent: |
Mutt/1.5.23 (2014-03-12) |
Oliver Jowett <address@hidden>:
> On 23 April 2016 at 11:28, Eric S. Raymond <address@hidden> wrote:
>
> > gpsd:WARN: KPPS:/dev/pps0 kernel PPS unavailable, PPS accuracy will suffer
> > gpsd:WARN: PPS:/dev/pps0 die: no TIOMCIWAIT, nor RFC2783 CANWAIT
>
> This looks similar to something I saw a while back where the serial driver
> (a usb-serial driver in my case) did not implement asynchronous
> notifications of handshake line state changes. So neither kernel PPS nor
> TIOMCIWAIT worked. (I never did get PPS working in that case)
>
> What's the underlying driver for ttyAMA0 on the Pi 3?
I believe it's the vanilla UART driver. But the HAT only supplies TX/RX,
not the handshake lines.
How it's supposed to work is that the HAT supplies 1PPS to GPIO pin 4,
and the pps-gpio driver turns that into RFC2783 events. We know this much
is working because ppstest shows them.
I think something about GPSD's setup code for the RFC2783 interface is getting
confused.
--
<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>
- [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Eric S. Raymond, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Oliver Jowett, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Frank Nicholas, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3,
Eric S. Raymond <=
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Gary E. Miller, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Eric S. Raymond, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Gary E. Miller, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Eric S. Raymond, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Oliver Jowett, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Gary E. Miller, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Oliver Jowett, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Fred Wright, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Hal Murray, 2016/04/23
- Re: [gpsd-dev] PPS not showing in gpsmon/gpsd on RPi 3, Gary E. Miller, 2016/04/24