Date: Tue, 22 Nov 2016 21:44:11 +0100 From: =?utf-8?Q?Peter_Ankerst=C3=A5l?= <peter@pean.org> To: Ian Lepore <ian@freebsd.org> Cc: "freebsd-arm@FreeBSD.org" <freebsd-arm@FreeBSD.org> Subject: Re: PPS input on GPIO pin RPI2. Message-ID: <E5F1DB25-1F0B-4FEB-BE48-F8181ABC25B6@pean.org> In-Reply-To: <1479846679.1889.8.camel@freebsd.org> References: <56FCEE15.60109@pean.org> <1460061822.1091.314.camel@freebsd.org> <794E7B45-5512-4032-8CBE-7D2BD1533BD4@pean.org> <1479426298.59911.135.camel@freebsd.org> <E2942C0C-D3A6-4163-B794-81CBF98C415B@pean.org> <1479426521.59911.137.camel@freebsd.org> <0D888B68-3231-4611-83FA-47DCD1A75CA5@pean.org> <1479837907.12501.39.camel@freebsd.org> <3FE31F8E-CFDF-4C36-89F8-B90EB8AC2D8D@pean.org> <1479846679.1889.8.camel@freebsd.org>
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--Apple-Mail=_73610912-0D67-4A8F-A993-B650D465BB7D Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > On 22 Nov 2016, at 21:31, Ian Lepore <ian@freebsd.org> wrote: >=20 > Cool! I notice we lost the CC to the arm@ list somewhere along the > line. I've added it back for this reply, so that other folks can see > how to get this all configured. >=20 > For those following along... this setup uses a PPS to make the kernel > clock very accurate, but also requires another (network-based) ntp = peer > to provide the time-of-day. The minimum entries you need in ntp.conf > for a configuration like this are: >=20 > server 127.127.22.0 prefer > fudge 127.127.22.0 stratum 0 > server <any network server> iburst prefer >=20 > Of particular importance is that the 'prefer' keyword is needed on the > pps (127.127.22.0) server and any one of the network servers. >=20 > For a pure GPS solution that doesn't require another network ntp = server > to number the seconds, the 'gpsd' port knows how to talk to most gps > receivers via a serial connection. That's about all I know about = gpsd. >=20 Actually ntpd knows how to interpet NMEA (including timestamps) output = which is usually output on the serial interface of your GPS. All you need to do is to hook up it to the serial interface of your = machine running ntpd and link your serial device to /dev/pps1 for = example. and then have something like this in ntp.conf: server 127.127.20.1 mode 17 fudge 127.127.20.1 time1 +0.140 the first line tells ntpd to look for NMEA on /dev/pps1 and some = settings about baudrate and so on.=20 the second line is to compensate for the delay of the serial interface = which you will have to figure out in some way.=20 More information about this here: = http://support.ntp.org/bin/view/Support/ConfiguringNMEARefclocks --Apple-Mail=_73610912-0D67-4A8F-A993-B650D465BB7D Content-Disposition: attachment; filename=smime.p7s Content-Type: application/pkcs7-signature; name=smime.p7s Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIL0TCCBeIw ggPKoAMCAQICEGunin0K14jWUQr5WeTntOEwDQYJKoZIhvcNAQELBQAwfTELMAkGA1UEBhMCSUwx 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