Date: Tue, 20 Aug 2019 11:37:59 +0930 From: "O'Connor, Daniel" <darius@dons.net.au> To: Ian Lepore <ian@freebsd.org> Cc: "usb@freebsd.org" <usb@FreeBSD.org>, "freebsd-arm@FreeBSD.org" <freebsd-arm@FreeBSD.org> Subject: Re: Is it a good idea to use a usb-serial adapter for PPS input? Yes, it is. Message-ID: <9D2ACA87-C2DB-40D9-9638-B0E215A4EEC0@dons.net.au> In-Reply-To: <9E142F1A-5E8C-4410-91F5-7C80B3D0A15B@dons.net.au> References: <f1d765814f722fb2c99c9870b3cc2607b4eca2d7.camel@freebsd.org> <B9EFA4D4-C1AD-4181-B421-F6BD53434FA5@dons.net.au> <bfd784f6ac9c939dbe6a243336bc3b6eab02d4f5.camel@freebsd.org> <61B1AAF3-40F6-47BC-8F05-7491C13BF288@dons.net.au> <9E142F1A-5E8C-4410-91F5-7C80B3D0A15B@dons.net.au>
next in thread | previous in thread | raw e-mail | index | archive | help
> On 19 Aug 2019, at 17:09, O'Connor, Daniel <darius@dons.net.au> wrote:
> I am going to try this diff but buildkernel is going to take a =
while...
Was a lot faster cross building, so I installed it this morning:
[gps 1:56] ~ >uname -a
FreeBSD gps 13.0-CURRENT FreeBSD 13.0-CURRENT #1 =
41a4c010326-c262109(master)-dirty: Tue Aug 20 11:04:57 ACST 2019 =
darius@midget.dons.net.au:/usr/obj/arm-src/arm.armv7/sys/GENERIC arm
[gps 1:57] ~ >dmesg|grep pps
am335x_dmtpps0: <AM335x PPS-Capture DMTimer4> mem 0x48044000-0x480443ff =
irq 30 on simplebus0
[gps 1:58] ~ >ll /dev/pps0 /dev/dmtpps
crw-rw---- 1 root ntpd 0x41 20 Aug 01:09 /dev/dmtpps
lrwxr-xr-x 1 root wheel 6 20 Aug 01:09 /dev/pps0 -> dmtpps
[gps 1:58] ~ >cat /etc/ntp.conf
server 10.0.2.1 iburst prefer
server 127.127.22.0 minpoll 4 maxpoll 4
fudge 127.127.22.0 refid PPS
[gps 1:59] ~ >ntpq -nc pe
remote refid st t when poll reach delay offset =
jitter
=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D
*10.0.2.1 214.52.129.40 3 u 64 64 37 0.349 -0.631 =
0.299
o127.127.22.0 .PPS. 0 l 13 16 377 0.000 1.000 =
0.106
It certainly seems happier with the PPS than it was before.
Next up would be to use the NMEA coming from the GPS engine for time =
instead of using the LAN host so it's self contained.
--
Daniel O'Connor
"The nice thing about standards is that there
are so many of them to choose from."
-- Andrew Tanenbaum
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9D2ACA87-C2DB-40D9-9638-B0E215A4EEC0>