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/freebsd/contrib/ntp/ntpd/
H A Drefclock_arbiter.c2 * refclock_arbiter - clock driver for Arbiter 1088A/B Satellite
3 * Controlled Clock
21 * This driver supports the Arbiter 1088A/B Satellite Controlled Clock.
22 * The claimed accuracy of this clock is 100 ns relative to the PPS
39 * on-time = <cr>
53 * Format TQ (IEEE P1344 estimated worst-case time quality)
55 * 0 clock locked, maximum accuracy
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H A Drefclock_wwvb.c2 * refclock_wwvb - clock driver for Spectracom WWVB and GPS receivers
27 * Synchronized Clocks and the Netclock/GPS Master Clock. Both the WWVB
30 * interference. The claimed accuracy of the WWVB clocks is 100 us
31 * relative to the broadcast signal, while the claimed accuracy of the
32 * GPS clock is 50 ns; however, in most cases the actual accuracy is
36 * The WWVB and GPS clocks should be configured for 24-hour display,
38 * baud rate 9600. If the clock is to used as the source for the IRIG
41 * signature control). The GPS clock ca
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H A Dntpd.1ntpdmdoc4 .\" EDIT THIS FILE WITH CAUTION (ntpd-opts.mdoc)
6 .\" It has been AutoGen-ed May 25, 2024 at 12:03:54 AM by AutoGen 5.18.16
7 .\" From the definitions ntpd-opts.def
8 .\" and the template file agmdoc-cmd.tpl
17 .Op Fl \-option\-name Ns Oo Oo Ns "=| " Oc Ns Ar value Oc
27 Network Time Protocol (NTP) version 4, as defined by RFC\-5905,
29 version 3, as defined by RFC\-1305, and versions 1
30 and 2, as defined by RFC\-1059 and RFC\-111
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/freebsd/contrib/ntp/html/drivers/
H A Ddriver11.html1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
13 <!-- #BeginDate format:En2m -->11-Sep-2010 05:56<!-- #EndDate -->
20 Serial Port: <tt>/dev/gps<i>u</i></tt>; 9600 baud, 8-bits, no parity<br>
23 …river supports the Arbiter 1088A/B Satellite Controlled Clock. The claimed accuracy of this clock …
29 on-time = &lt;cr&gt;
38 <p>Format <tt>TQ</tt> (IEEE P1344 estimated worst-case time quality)</p>
39 <pre>0&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; clock locked, maximum accuracy
40 F&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; clock failure, time not reliable
41 4&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; clock unlocked, accuracy &lt; 1 us
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H A Ddriver4.html1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
8 <!--
10 font-family: Symbol
12 -->
19 <!-- #BeginDate format:En2m -->11-Sep-2010 05:56<!-- #EndDate -->
26 Serial Port: <tt>/dev/wwvb<i>u</i></tt>; 9600 baud, 8-bits, no parity<br>
30 …Clock. The claimed accuracy of the WWVB clocks is 100 <span class="style1">m</span>s relative to t…
31 …ese clocks should be set to 24-hour display, AUTO DST off, data format 0 or 2 (see below) and baud…
35 <p>on-time = first &lt;cr&gt;<br>
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H A Ddriver19.html1 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="Content-Type" content="text/html;charset=iso-8859-1">
13 <!-- #BeginDate format:En2m -->11-Sep-2010 05:56<!-- #EndDate -->
20 Serial Port: <tt>/dev/heath<i>u</i></tt>; 1200 baud, 8-bits, no parity<br>
24 …-1000 Most Accurate Clock, with RS232C Output Accessory. This is a WWV/WWVH receiver somewhat less…
25 …e and the current year. The external DIPswitches should be set to GMT and 24-hour format. It is ve…
26 …clock responds to a rising edge of the request to send (RTS) modem control line by sending the tim…
27 <p>The clock message consists of 23 ASCII printing characters in the following format:</p>
34 <p>A fudge time1 value of .07 s appears to center the clock offset residuals.</p>
55 <p><a href="../refclock.html">Reference Clock Drivers</a>&nbsp;</p>
H A Ddriver6.html1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
13 <!-- #BeginDate format:En2m -->17-Jul-2014 02:17<!-- #EndDate -->
22 …-Range Instrumentation Group (IRIG) standard time distribution signal. This signal is generated by…
23 <p>The driver requires an audio codec or sound card with sampling rate 8 kHz and &mu;-law compandin…
24 …d 50 Ohms. In such cases the cable should be terminated at the line-in port with a 50-Ohm resistor…
25 … to the PPS&nbsp;signal from a GPS&nbsp;receiver, the mean offset with a 2.4-GHz P4 running FreeBS…
26 …accuracy with Solaris 2.8 and beyond has been seriously degraded to the order of several milliseco…
27 …his page. Note that additional checks are done elsewhere in the reference clock interface routines…
28 …okup, debugging and monitoring, see the <a href="../audio.html">Reference Clock Audio Drivers</a> …
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/freebsd/sys/contrib/device-tree/Bindings/clock/
H A Dfixed-clock.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/clock/fixed-clock.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Simple fixed-rate clock sources
10 - Michael Turquette <mturquette@baylibre.com>
11 - Stephen Boyd <sboyd@kernel.org>
15 const: fixed-clock
17 "#clock-cells":
20 clock-frequency: true
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/freebsd/usr.sbin/ntp/doc/
H A Dntpdate.845 servers specified and a subset of the NTP clock filter and
48 that the accuracy and reliability of
55 .Bl -tag -width indent
74 call, even if the measured offset is greater than +-128 ms.
79 greater than +-128 ms.
81 than +-128 ms in this case, it can take a long time (hours) to
82 slew the clock to the correct value.
98 through all the steps, but not adjust the local clock.
135 Query only - do not set the clock.
177 host clock, or it can be run from the host startup script to set
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/freebsd/contrib/ntp/html/hints/
H A Dmpeix1 HP e3000 MPE/iX NTP Hints - May 29, 2001
2 ----------------------------------------
8 NTP was re-ported to MPE in May 2001. What follows are hints learned from
12 MPE lacks the clock-related APIs expected by NTP, so adjtime(), gettimeofday(),
16 Unfortunately the implementation of adjtime() has exposed a sub-second accuracy
22 This bug has a side-effect whereby the ntpd daemon will screw up the hardware
23 PDC clock time by many minutes if used for continuous clock adjustments or in
24 the one-time -q mode. But note that you can safely run ntpd in order to become
27 The one-time clock adjustment functionality of ntpdate and ntp_timeset is not
28 affected by this bug side-effect. You can safely use these commands to alter
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H A Dsolaris.html10 <!-- #BeginDate format:En2m -->27-Jan-2014 05:31<!-- #EndDate -->
13 <! -- This is deliberately not a mailto -- > &lt;jhawk@MIT.EDU&gt;
23 <A HREF="solaris-dosynctodr.html">Here is the report</A>.
26 variable <I>dosynctodr</I> to zero (meaning "do not synchronize the clock
27 to the hardware time-of-day clock"). This can be done with the
30 tickadj -s
34 echo dosynctodr/W0 | adb -k -w /dev/ksyms /dev/mem
44 clock tick (c.f. <A HREF="#frequency_tolerance">Dealing
49 nanoseconds and microseconds, respectively, added to the system clock
50 each clock interrupt. Enterprising souls may set these based on
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/freebsd/contrib/ntp/html/
H A Dntpdate.html1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
6 <title>ntpdate - set the date and time via NTP</title>
10 <h3><tt>ntpdate</tt> - set the date and time via NTP</h3>
14 <!-- #BeginDate format:En2m -->21-Jul-2018 04:09<!-- #EndDate -->
25 See the <tt>-q</tt> command line option in the <a
26 href="ntpd.html"><tt>ntpd</tt> - Network Time Protocol (NTP) daemon</a>
27 page and/or the <a href="sntp.html"><tt>sntp</tt> - Simple Network Time
30 <tt>ntpdate [ -46bBdqsuv ] [ -a <i>key</i> ] [ -e <i>authdelay</i> ] [ -k <i>keyfile</i> ] [ -o <i>…
32 …d and a subset of the NTP clock filter and selection algorithms are applied to select the best of …
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H A Dparsedata.html1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
6 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
8 <title>NTP PARSE clock data formats</title>
13 <h3>NTP PARSE clock data formats</h3>
14 … mechanisms. In order for you to find a sample that might be similar to a clock you might want to …
16 <!-- #BeginDate format:En2m -->21-Oct-2010 23:44<!-- #EndDate -->
26 …the firmware for the use with NTP. So, if you are going to use a Meinberg clock please ask whether…
28 …accuracy of a few milliseconds. The DCF77 PZF5xx variants provide higher accuracy and have a prett…
50 <i>&lt;STX&gt;</i> = start-of-text, ASCII code 0x02
67 <i>&lt;ETX&gt;</i> = end-of-text, ASCII code 0x03
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H A Drelease.html1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
14 <!-- #BeginDate format:En1m -->3-Oc
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H A Dpps.html1 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
4 <meta http-equiv="content-type" content="text/html;charset=iso-8859-1">
6 <title>Pulse-Per-Second (PPS) Signal Interfacing</title>
10 <h3>Pulse-Per-Second (PPS) Signal Interfacing</h3>
14 <!-- #BeginDate format:En2m -->10-Mar-2014 05:17<!-- #EndDate -->
24 <li class="inline"><a href="#use">Using the Pulse-per-Second (PPS) Signal</a></li>
28 …accuracy using typical timecode formats, where the on-time epoch is indicated by a designated ASCI…
35 …inum minibox containing the the circuitry, serial connector and optional 12-V power connector. A …
36 …-width pulse at EIA levels and is for use with a timecode receiver or precision oscillator with a …
40 …Clock Discipline</a> page can be used. It operates in conjunction with another source that provide…
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/freebsd/sys/contrib/device-tree/src/arm/alphascale/
H A Dalphascale-asm9260.dtsi2 * Copyright 2014 Oleksij Rempel <linux@rempel-privat.de>
7 #include <dt-bindings/clock/alphascale,asm9260.h>
10 #address-cells = <1>;
11 #size-cells = <1>;
12 interrupt-parent = <&icoll>;
20 #address-cells = <0>;
21 #size-cells = <0>;
24 compatible = "arm,arm926ej-s";
31 compatible = "fixed-clock";
32 #clock-cells = <0>;
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/freebsd/sys/contrib/device-tree/src/arm/intel/pxa/
H A Dpxa300-raumfeld-tuneable-clock.dtsi1 // SPDX-License-Identifier: GPL-2.0
3 #include <dt-bindings/clock/maxim,max9485.h>
6 xo_27mhz: oscillator-27mhz {
7 compatible = "fixed-clock";
8 #clock-cells = <0>;
9 clock-frequency = <27000000>;
10 clock-accuracy = <100>;
14 compatible = "simple-audio-card";
15 simple-audio-card,name = "Raumfeld Speaker";
16 #address-cells = <1>;
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H A Dpxa300-raumfeld-speaker-one.dts1 // SPDX-License-Identifier: GPL-2.0
3 /dts-v1/;
5 #include "pxa300-raumfeld-common.dtsi"
9 compatible = "raumfeld,raumfeld-speaker-one-pxa303", "marvell,pxa300";
13 #sound-dai-cells = <0>;
14 Vdd-supply = <&reg_3v3>;
15 Vdda-supply = <&reg_va_5v0>;
18 xo_11mhz: oscillator-11mhz {
19 compatible = "fixed-clock";
20 #clock-cells = <0>;
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/freebsd/sys/sys/
H A Dclock.h1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
34 * This file is the central clearing-house for calendrical issues.
37 * daylight savings time, leap-years and such. All that is theoretically a
55 * Structure to hold the values typically reported by time-of-day clocks,
60 * 0 - 69 = 2000 - 2069
61 * 70 - 99 = 1970 - 1999
62 * 100 - 199 = 2000 - 2099 (Supports hardware "century bit".)
63 * 200 - 1969 = Invalid.
64 * 1970 - 9999 = Full 4-digit century+year.
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/freebsd/contrib/ntp/libparse/
H A DREADME1 PARSE reference clock driver:
14 support. Kernelsupport increases accuracy tremendingly. The current restriction
22 parsestreams.loadable_module.o - standard parse module for SunOS 4
27 parse - auto loadable streams module
32 The structure of the parse reference clock driver is as follows:
34 ntpd - contains NTP implementation and calls a reference clock
37 - which contains several refclock decriptions. These are
41 (/dev/refclock-0 - /dev/refclock-3).
43 The kind of clock is selected by the mode parameter. This parameter
44 selects the clock type which deterimines how I/O is done,
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/freebsd/sys/contrib/device-tree/Bindings/iio/adc/
H A Dti-adc12138.txt4 - compatible: Should be one of
8 - reg: SPI chip select number for the device
9 - interrupts: Should contain interrupt for EOC (end of conversion)
10 - clocks: phandle to conversion clock input
11 - spi-max-frequency: Definision as per
12 Documentation/devicetree/bindings/spi/spi-bus.txt
13 - vref-p-supply: The regulator supply for positive analog voltage reference
16 - vref-n-supply: The regulator supply for negative analog voltage reference
17 (Note that this must not go below GND or exceed vref-p)
19 - ti,acquisition-time: The number of conversion clock periods for the S/H's
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H A Drenesas,rzg2l-adc.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/iio/adc/renesas,rzg2l-adc.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
13 A/D Converter block is a successive approximation analog-to-digital converter
14 with a 12-bit accuracy. Up to eight analog input channels can be selected.
16 stored in a 32-bit data register corresponding to each channel.
21 - enum:
22 - renesas,r9a07g043-adc # RZ/G2UL and RZ/Five
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H A Dti,adc12138.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Texas Instruments ADC12138 and similar self-calibrating ADCs
10 - Akinobu Mita <akinobu.mita@gmail.com>
19 - ti,adc12130
20 - ti,adc12132
21 - ti,adc12138
32 description: Conversion clock input.
34 vref-p-supply:
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/freebsd/sys/contrib/device-tree/Bindings/mfd/
H A Drohm,bd70528-pmic.txt3 BD70528MWV is an ultra-low quiescent current general purpose, single-chip,
4 power management IC for battery-powered portable devices. The IC
5 integrates 3 ultra-low current consumption buck converters, 3 LDOs and 2
6 LED Drivers. Also included are 4 GPIOs, a real-time clock (RTC), a 32kHz
7 clock gate, high-accuracy VREF for use with an external ADC, flexible
8 dual-input power path, 10 bit SAR ADC for battery temperature monitor and
12 - compatible : Should be "rohm,bd70528"
13 - reg : I2C slave address.
14 - interrupts : The interrupt line the device is connected to.
15 - interrupt-controller : To indicate BD70528 acts as an interrupt controller.
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/freebsd/lib/libsys/
H A Dclock_gettime.254 used by a clock which is specified by
65 .Bl -tag -width indent -compact
70 Increments in SI seconds like a wall clock.
97 query, using an in-kernel cached value of the current second.
104 The clock IDs
111 The clock IDs with the _FAST suffix, i.e.,
117 a full time counter query, so their accuracy is one timer tick.
125 The clock ID
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