876 lines
21 KiB
C
876 lines
21 KiB
C
/* $NetBSD: refclock_true.c,v 1.4 2003/12/04 16:23:37 drochner Exp $ */
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/*
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* refclock_true - clock driver for the Kinemetrics Truetime receivers
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* Receiver Version 3.0C - tested plain, with CLKLDISC
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* Developement work being done:
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* - Properly handle varying satellite positions (more acurately)
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* - Integrate GPSTM and/or OMEGA and/or TRAK and/or ??? drivers
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#if defined(REFCLOCK) && defined(CLOCK_TRUETIME)
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#include "ntpd.h"
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#include "ntp_io.h"
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#include "ntp_refclock.h"
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#include "ntp_unixtime.h"
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#include "ntp_stdlib.h"
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#include <stdio.h>
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#include <ctype.h>
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/* This should be an atom clock but those are very hard to build.
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*
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* The PCL720 from P C Labs has an Intel 8253 lookalike, as well as a bunch
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* of TTL input and output pins, all brought out to the back panel. If you
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* wire a PPS signal (such as the TTL PPS coming out of a GOES or other
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* Kinemetrics/Truetime clock) to the 8253's GATE0, and then also wire the
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* 8253's OUT0 to the PCL720's INPUT3.BIT0, then we can read CTR0 to get the
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* number of uSecs since the last PPS upward swing, mediated by reading OUT0
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* to find out if the counter has wrapped around (this happens if more than
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* 65535us (65ms) elapses between the PPS event and our being called.)
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*/
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#ifdef CLOCK_PPS720
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# undef min /* XXX */
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# undef max /* XXX */
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# include <machine/inline.h>
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# include <sys/pcl720.h>
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# include <sys/i8253.h>
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# define PCL720_IOB 0x2a0 /* XXX */
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# define PCL720_CTR 0 /* XXX */
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#endif
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/*
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* Support for Kinemetrics Truetime Receivers
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* GOES
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* GPS/TM-TMD
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* XL-DC (a 151-602-210, reported by the driver as a GPS/TM-TMD)
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* GPS-800 TCU (an 805-957 with the RS232 Talker/Listener module)
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* OM-DC: getting stale ("OMEGA")
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*
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* Most of this code is originally from refclock_wwvb.c with thanks.
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* It has been so mangled that wwvb is not a recognizable ancestor.
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*
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* Timcode format: ADDD:HH:MM:SSQCL
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* A - control A (this is stripped before we see it)
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* Q - Quality indication (see below)
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* C - Carriage return
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* L - Line feed
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*
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* Quality codes indicate possible error of
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* 468-DC GOES Receiver:
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* GPS-TM/TMD Receiver: (default quality codes for XL-DC)
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* ? +/- 1 milliseconds # +/- 100 microseconds
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* * +/- 10 microseconds . +/- 1 microsecond
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* space less than 1 microsecond
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* OM-DC OMEGA Receiver: (default quality codes for OMEGA)
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* WARNING OMEGA navigation system is no longer existent
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* > >+- 5 seconds
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* ? >+/- 500 milliseconds # >+/- 50 milliseconds
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* * >+/- 5 milliseconds . >+/- 1 millisecond
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* A-H less than 1 millisecond. Character indicates which station
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* is being received as follows:
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* A = Norway, B = Liberia, C = Hawaii, D = North Dakota,
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* E = La Reunion, F = Argentina, G = Australia, H = Japan.
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*
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* The carriage return start bit begins on 0 seconds and extends to 1 bit time.
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*
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* Notes on 468-DC and OMEGA receiver:
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*
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* Send the clock a 'R' or 'C' and once per second a timestamp will
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* appear. Send a 'P' to get the satellite position once (GOES only.)
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*
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* Notes on the 468-DC receiver:
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*
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* Since the old east/west satellite locations are only historical, you can't
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* set your clock propagation delay settings correctly and still use
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* automatic mode. The manual says to use a compromise when setting the
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* switches. This results in significant errors. The solution; use fudge
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* time1 and time2 to incorporate corrections. If your clock is set for
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* 50 and it should be 58 for using the west and 46 for using the east,
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* use the line
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*
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* fudge 127.127.5.0 time1 +0.008 time2 -0.004
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*
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* This corrects the 4 milliseconds advance and 8 milliseconds retard
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* needed. The software will ask the clock which satellite it sees.
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*
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* Ntp.conf parameters:
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* time1 - offset applied to samples when reading WEST satellite (default = 0)
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* time2 - offset applied to samples when reading EAST satellite (default = 0)
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* val1 - stratum to assign to this clock (default = 0)
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* val2 - refid assigned to this clock (default = "TRUE", see below)
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* flag1 - will silence the clock side of ntpd, just reading the clock
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* without trying to write to it. (default = 0)
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* flag2 - generate a debug file /tmp/true%d.
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* flag3 - enable ppsclock streams module
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* flag4 - use the PCL-720 (BSD/OS only)
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*/
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/*
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* Definitions
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*/
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#define DEVICE "/dev/true%d"
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#define SPEED232 B9600 /* 9600 baud */
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/*
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* Radio interface parameters
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*/
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#define PRECISION (-10) /* precision assumed (about 1 ms) */
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#define REFID "TRUE" /* reference id */
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#define DESCRIPTION "Kinemetrics/TrueTime Receiver"
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/*
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* Tags which station (satellite) we see
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*/
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#define GOES_WEST 0 /* Default to WEST satellite and apply time1 */
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#define GOES_EAST 1 /* until you discover otherwise */
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/*
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* used by the state machine
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*/
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enum true_event {e_Init, e_Huh, e_F18, e_F50, e_F51, e_Satellite,
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e_Poll, e_Location, e_TS, e_Max};
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const char *events[] = {"Init", "Huh", "F18", "F50", "F51", "Satellite",
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"Poll", "Location", "TS"};
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#define eventStr(x) (((int)x<(int)e_Max) ? events[(int)x] : "?")
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enum true_state {s_Base, s_InqTM, s_InqTCU, s_InqOmega, s_InqGOES,
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s_Init, s_F18, s_F50, s_Start, s_Auto, s_Max};
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const char *states[] = {"Base", "InqTM", "InqTCU", "InqOmega", "InqGOES",
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"Init", "F18", "F50", "Start", "Auto"};
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#define stateStr(x) (((int)x<(int)s_Max) ? states[(int)x] : "?")
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enum true_type {t_unknown, t_goes, t_tm, t_tcu, t_omega, t_Max};
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const char *types[] = {"unknown", "goes", "tm", "tcu", "omega"};
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#define typeStr(x) (((int)x<(int)t_Max) ? types[(int)x] : "?")
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/*
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* unit control structure
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*/
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struct true_unit {
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unsigned int pollcnt; /* poll message counter */
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unsigned int station; /* which station we are on */
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unsigned int polled; /* Hand in a time sample? */
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enum true_state state; /* state machine */
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enum true_type type; /* what kind of clock is it? */
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int unit; /* save an extra copy of this */
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FILE *debug; /* debug logging file */
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#ifdef CLOCK_PPS720
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int pcl720init; /* init flag for PCL 720 */
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#endif
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};
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/*
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* Function prototypes
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*/
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static int true_start P((int, struct peer *));
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static void true_shutdown P((int, struct peer *));
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static void true_receive P((struct recvbuf *));
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static void true_poll P((int, struct peer *));
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static void true_send P((struct peer *, const char *));
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static void true_doevent P((struct peer *, enum true_event));
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#ifdef CLOCK_PPS720
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static u_long true_sample720 P((void));
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#endif
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/*
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* Transfer vector
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*/
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struct refclock refclock_true = {
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true_start, /* start up driver */
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true_shutdown, /* shut down driver */
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true_poll, /* transmit poll message */
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noentry, /* not used (old true_control) */
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noentry, /* initialize driver (not used) */
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noentry, /* not used (old true_buginfo) */
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NOFLAGS /* not used */
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};
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#if !defined(__STDC__)
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# define true_debug (void)
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#else
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static void
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true_debug(struct peer *peer, const char *fmt, ...)
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{
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va_list ap;
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int want_debugging, now_debugging;
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struct refclockproc *pp;
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struct true_unit *up;
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va_start(ap, fmt);
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pp = peer->procptr;
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up = (struct true_unit *)pp->unitptr;
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want_debugging = (pp->sloppyclockflag & CLK_FLAG2) != 0;
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now_debugging = (up->debug != NULL);
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if (want_debugging != now_debugging)
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{
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if (want_debugging) {
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char filename[40];
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int fd;
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snprintf(filename, sizeof(filename), "/tmp/true%d.debug", up->unit);
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fd = open(filename, O_CREAT | O_WRONLY | O_EXCL, 0600);
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if (fd >= 0 && (up->debug = fdopen(fd, "r+"))) {
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#ifdef HAVE_SETVBUF
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static char buf[BUFSIZ];
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setvbuf(up->debug, buf, _IOLBF, BUFSIZ);
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#else
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setlinebuf(up->debug);
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#endif
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}
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} else {
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fclose(up->debug);
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up->debug = NULL;
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}
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}
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if (up->debug) {
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fprintf(up->debug, "true%d: ", up->unit);
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vfprintf(up->debug, fmt, ap);
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}
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}
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#endif /*STDC*/
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/*
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* true_start - open the devices and initialize data for processing
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*/
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static int
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true_start(
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int unit,
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struct peer *peer
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)
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{
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register struct true_unit *up;
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struct refclockproc *pp;
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char device[40];
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int fd;
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/*
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* Open serial port
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*/
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(void)snprintf(device, sizeof(device), DEVICE, unit);
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if (!(fd = refclock_open(device, SPEED232, LDISC_CLK)))
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return (0);
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/*
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* Allocate and initialize unit structure
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*/
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if (!(up = (struct true_unit *)
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emalloc(sizeof(struct true_unit)))) {
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(void) close(fd);
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return (0);
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}
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memset((char *)up, 0, sizeof(struct true_unit));
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pp = peer->procptr;
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pp->io.clock_recv = true_receive;
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pp->io.srcclock = (caddr_t)peer;
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pp->io.datalen = 0;
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pp->io.fd = fd;
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if (!io_addclock(&pp->io)) {
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(void) close(fd);
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free(up);
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return (0);
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}
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pp->unitptr = (caddr_t)up;
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/*
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* Initialize miscellaneous variables
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*/
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peer->precision = PRECISION;
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pp->clockdesc = DESCRIPTION;
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memcpy((char *)&pp->refid, REFID, 4);
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up->pollcnt = 2;
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up->type = t_unknown;
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up->state = s_Base;
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true_doevent(peer, e_Init);
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return (1);
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}
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/*
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* true_shutdown - shut down the clock
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*/
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static void
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true_shutdown(
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int unit,
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struct peer *peer
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)
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{
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register struct true_unit *up;
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struct refclockproc *pp;
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pp = peer->procptr;
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up = (struct true_unit *)pp->unitptr;
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io_closeclock(&pp->io);
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free(up);
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}
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/*
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* true_receive - receive data from the serial interface on a clock
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*/
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static void
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true_receive(
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struct recvbuf *rbufp
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)
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{
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register struct true_unit *up;
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struct refclockproc *pp;
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struct peer *peer;
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u_short new_station;
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char synced;
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int i;
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int lat, lon, off; /* GOES Satellite position */
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/* Use these variable to hold data until we decide its worth keeping */
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char rd_lastcode[BMAX];
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l_fp rd_tmp;
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u_short rd_lencode;
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/*
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* Get the clock this applies to and pointers to the data.
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*/
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peer = (struct peer *)rbufp->recv_srcclock;
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pp = peer->procptr;
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up = (struct true_unit *)pp->unitptr;
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/*
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* Read clock output. Automatically handles STREAMS, CLKLDISC.
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*/
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rd_lencode = refclock_gtlin(rbufp, rd_lastcode, BMAX, &rd_tmp);
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rd_lastcode[rd_lencode] = '\0';
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/*
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* There is a case where <cr><lf> generates 2 timestamps.
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*/
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if (rd_lencode == 0)
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return;
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pp->lencode = rd_lencode;
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strcpy(pp->a_lastcode, rd_lastcode);
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pp->lastrec = rd_tmp;
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true_debug(peer, "receive(%s) [%d]\n", pp->a_lastcode, pp->lencode);
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up->pollcnt = 2;
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record_clock_stats(&peer->srcadr, pp->a_lastcode);
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/*
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* We get down to business, check the timecode format and decode
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* its contents. This code decodes a multitude of different
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* clock messages. Timecodes are processed if needed. All replies
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* will be run through the state machine to tweak driver options
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* and program the clock.
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*/
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/*
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* Clock misunderstood our last command?
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*/
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if (pp->a_lastcode[0] == '?' ||
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strcmp(pp->a_lastcode, "ERROR 05 NO SUCH FUNCTION") == 0) {
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true_doevent(peer, e_Huh);
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return;
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}
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/*
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* Timecode: "nnnnn+nnn-nnn"
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* (from GOES clock when asked about satellite position)
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*/
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if ((pp->a_lastcode[5] == '+' || pp->a_lastcode[5] == '-') &&
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(pp->a_lastcode[9] == '+' || pp->a_lastcode[9] == '-') &&
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sscanf(pp->a_lastcode, "%5d%*c%3d%*c%3d", &lon, &lat, &off) == 3
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) {
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const char *label = "Botch!";
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/*
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* This is less than perfect. Call the (satellite)
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* either EAST or WEST and adjust slop accodingly
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* Perfectionists would recalculate the exact delay
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* and adjust accordingly...
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*/
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if (lon > 7000 && lon < 14000) {
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if (lon < 10000) {
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new_station = GOES_EAST;
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label = "EAST";
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} else {
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new_station = GOES_WEST;
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label = "WEST";
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}
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if (new_station != up->station) {
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double dtemp;
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dtemp = pp->fudgetime1;
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pp->fudgetime1 = pp->fudgetime2;
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pp->fudgetime2 = dtemp;
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up->station = new_station;
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}
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}
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else {
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/*refclock_report(peer, CEVNT_BADREPLY);*/
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label = "UNKNOWN";
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}
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true_debug(peer, "GOES: station %s\n", label);
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true_doevent(peer, e_Satellite);
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return;
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}
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/*
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* Timecode: "Fnn"
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* (from TM/TMD clock when it wants to tell us what it's up to.)
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*/
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if (sscanf(pp->a_lastcode, "F%2d", &i) == 1 && i > 0 && i < 80) {
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switch (i) {
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case 50:
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true_doevent(peer, e_F50);
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break;
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case 51:
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true_doevent(peer, e_F51);
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break;
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default:
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true_debug(peer, "got F%02d - ignoring\n", i);
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break;
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}
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return;
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}
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/*
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* Timecode: " TRUETIME Mk III" or " TRUETIME XL"
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* (from a TM/TMD/XL clock during initialization.)
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*/
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if (strcmp(pp->a_lastcode, " TRUETIME Mk III") == 0 ||
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strncmp(pp->a_lastcode, " TRUETIME XL", 12) == 0) {
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true_doevent(peer, e_F18);
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NLOG(NLOG_CLOCKSTATUS) {
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msyslog(LOG_INFO, "TM/TMD/XL: %s", pp->a_lastcode);
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}
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return;
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}
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/*
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* Timecode: "N03726428W12209421+000033"
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* 1 2
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* 0123456789012345678901234
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* (from a TCU during initialization)
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*/
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if ((pp->a_lastcode[0] == 'N' || pp->a_lastcode[0] == 'S') &&
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(pp->a_lastcode[9] == 'W' || pp->a_lastcode[9] == 'E') &&
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pp->a_lastcode[18] == '+') {
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true_doevent(peer, e_Location);
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NLOG(NLOG_CLOCKSTATUS) {
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msyslog(LOG_INFO, "TCU-800: %s", pp->a_lastcode);
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}
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return;
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}
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/*
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* Timecode: "ddd:hh:mm:ssQ"
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* (from all clocks supported by this driver.)
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*/
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if (pp->a_lastcode[3] == ':' &&
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pp->a_lastcode[6] == ':' &&
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pp->a_lastcode[9] == ':' &&
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sscanf(pp->a_lastcode, "%3d:%2d:%2d:%2d%c",
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&pp->day, &pp->hour, &pp->minute,
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&pp->second, &synced) == 5) {
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/*
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* Adjust the synchronize indicator according to timecode
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* say were OK, and then say not if we really are not OK
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*/
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if (synced == '>' || synced == '#' || synced == '?')
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pp->leap = LEAP_NOTINSYNC;
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else
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pp->leap = LEAP_NOWARNING;
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true_doevent(peer, e_TS);
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#ifdef CLOCK_PPS720
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/* If it's taken more than 65ms to get here, we'll lose. */
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if ((pp->sloppyclockflag & CLK_FLAG4) && up->pcl720init) {
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l_fp off;
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#ifdef CLOCK_ATOM
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/*
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* find out what time it really is. Include
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|
* the count from the PCL720
|
|
*/
|
|
if (!clocktime(pp->day, pp->hour, pp->minute,
|
|
pp->second, GMT, pp->lastrec.l_ui,
|
|
&pp->yearstart, &off.l_ui)) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
return;
|
|
}
|
|
off.l_uf = 0;
|
|
#endif
|
|
|
|
pp->usec = true_sample720();
|
|
#ifdef CLOCK_ATOM
|
|
TVUTOTSF(pp->usec, off.l_uf);
|
|
#endif
|
|
|
|
/*
|
|
* Stomp all over the timestamp that was pulled out
|
|
* of the input stream. It's irrelevant since we've
|
|
* adjusted the input time to reflect now (via pp->usec)
|
|
* rather than when the data was collected.
|
|
*/
|
|
get_systime(&pp->lastrec);
|
|
#ifdef CLOCK_ATOM
|
|
/*
|
|
* Create a true offset for feeding to pps_sample()
|
|
*/
|
|
L_SUB(&off, &pp->lastrec);
|
|
|
|
pps_sample(peer, &off);
|
|
#endif
|
|
true_debug(peer, "true_sample720: %luus\n", pp->usec);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* The clock will blurt a timecode every second but we only
|
|
* want one when polled. If we havn't been polled, bail out.
|
|
*/
|
|
if (!up->polled)
|
|
return;
|
|
|
|
true_doevent(peer, e_Poll);
|
|
if (!refclock_process(pp)) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
return;
|
|
}
|
|
/*
|
|
* If clock is good we send a NOMINAL message so that
|
|
* any previous BAD messages are nullified
|
|
*/
|
|
pp->lastref = pp->lastrec;
|
|
refclock_receive(peer);
|
|
refclock_report(peer, CEVNT_NOMINAL);
|
|
|
|
/*
|
|
* We have succedded in answering the poll.
|
|
* Turn off the flag and return
|
|
*/
|
|
up->polled = 0;
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* No match to known timecodes, report failure and return
|
|
*/
|
|
refclock_report(peer, CEVNT_BADREPLY);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* true_send - time to send the clock a signal to cough up a time sample
|
|
*/
|
|
static void
|
|
true_send(
|
|
struct peer *peer,
|
|
const char *cmd
|
|
)
|
|
{
|
|
struct refclockproc *pp;
|
|
|
|
pp = peer->procptr;
|
|
if (!(pp->sloppyclockflag & CLK_FLAG1)) {
|
|
register int len = strlen(cmd);
|
|
|
|
true_debug(peer, "Send '%s'\n", cmd);
|
|
if (write(pp->io.fd, cmd, (unsigned)len) != len)
|
|
refclock_report(peer, CEVNT_FAULT);
|
|
else
|
|
pp->polls++;
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* state machine for initializing and controlling a clock
|
|
*/
|
|
static void
|
|
true_doevent(
|
|
struct peer *peer,
|
|
enum true_event event
|
|
)
|
|
{
|
|
struct true_unit *up;
|
|
struct refclockproc *pp;
|
|
|
|
pp = peer->procptr;
|
|
up = (struct true_unit *)pp->unitptr;
|
|
if (event != e_TS) {
|
|
NLOG(NLOG_CLOCKSTATUS) {
|
|
msyslog(LOG_INFO, "TRUE: clock %s, state %s, event %s",
|
|
typeStr(up->type),
|
|
stateStr(up->state),
|
|
eventStr(event));
|
|
}
|
|
}
|
|
true_debug(peer, "clock %s, state %s, event %s\n",
|
|
typeStr(up->type), stateStr(up->state), eventStr(event));
|
|
switch (up->type) {
|
|
case t_goes:
|
|
switch (event) {
|
|
case e_Init: /* FALLTHROUGH */
|
|
case e_Satellite:
|
|
/*
|
|
* Switch back to on-second time codes and return.
|
|
*/
|
|
true_send(peer, "C");
|
|
up->state = s_Start;
|
|
break;
|
|
case e_Poll:
|
|
/*
|
|
* After each poll, check the station (satellite).
|
|
*/
|
|
true_send(peer, "P");
|
|
/* No state change needed. */
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case t_omega:
|
|
switch (event) {
|
|
case e_Init:
|
|
true_send(peer, "C");
|
|
up->state = s_Start;
|
|
break;
|
|
case e_TS:
|
|
if (up->state != s_Start && up->state != s_Auto) {
|
|
true_send(peer, "\03\r");
|
|
break;
|
|
}
|
|
up->state = s_Auto;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case t_tm:
|
|
switch (event) {
|
|
case e_Init:
|
|
true_send(peer, "F18\r");
|
|
up->state = s_Init;
|
|
break;
|
|
case e_F18:
|
|
true_send(peer, "F50\r");
|
|
up->state = s_F18;
|
|
break;
|
|
case e_F50:
|
|
true_send(peer, "F51\r");
|
|
up->state = s_F50;
|
|
break;
|
|
case e_F51:
|
|
true_send(peer, "F08\r");
|
|
up->state = s_Start;
|
|
break;
|
|
case e_TS:
|
|
if (up->state != s_Start && up->state != s_Auto) {
|
|
true_send(peer, "\03\r");
|
|
break;
|
|
}
|
|
up->state = s_Auto;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case t_tcu:
|
|
switch (event) {
|
|
case e_Init:
|
|
true_send(peer, "MD3\r"); /* GPS Synch'd Gen. */
|
|
true_send(peer, "TSU\r"); /* UTC, not GPS. */
|
|
true_send(peer, "AU\r"); /* Auto Timestamps. */
|
|
up->state = s_Start;
|
|
break;
|
|
case e_TS:
|
|
if (up->state != s_Start && up->state != s_Auto) {
|
|
true_send(peer, "\03\r");
|
|
break;
|
|
}
|
|
up->state = s_Auto;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
case t_unknown:
|
|
switch (up->state) {
|
|
case s_Base:
|
|
if (event != e_Init)
|
|
abort();
|
|
true_send(peer, "P\r");
|
|
up->state = s_InqGOES;
|
|
break;
|
|
case s_InqGOES:
|
|
switch (event) {
|
|
case e_Satellite:
|
|
up->type = t_goes;
|
|
true_doevent(peer, e_Init);
|
|
break;
|
|
case e_Init: /*FALLTHROUGH*/
|
|
case e_Huh: /*FALLTHROUGH*/
|
|
case e_TS:
|
|
up->state = s_InqOmega;
|
|
true_send(peer, "C\r");
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
break;
|
|
case s_InqOmega:
|
|
switch (event) {
|
|
case e_TS:
|
|
up->type = t_omega;
|
|
up->state = s_Auto; /* Inq side-effect. */
|
|
break;
|
|
case e_Init: /*FALLTHROUGH*/
|
|
case e_Huh:
|
|
up->state = s_InqTM;
|
|
true_send(peer, "F18\r");
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
break;
|
|
case s_InqTM:
|
|
switch (event) {
|
|
case e_F18:
|
|
up->type = t_tm;
|
|
true_doevent(peer, e_Init);
|
|
break;
|
|
case e_Init: /*FALLTHROUGH*/
|
|
case e_Huh:
|
|
true_send(peer, "PO\r");
|
|
up->state = s_InqTCU;
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
break;
|
|
case s_InqTCU:
|
|
switch (event) {
|
|
case e_Location:
|
|
up->type = t_tcu;
|
|
true_doevent(peer, e_Init);
|
|
break;
|
|
case e_Init: /*FALLTHROUGH*/
|
|
case e_Huh:
|
|
up->state = s_Base;
|
|
sleep(1); /* XXX */
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
break;
|
|
/*
|
|
* An expedient hack to prevent lint complaints,
|
|
* these don't actually need to be used here...
|
|
*/
|
|
case s_Init:
|
|
case s_F18:
|
|
case s_F50:
|
|
case s_Start:
|
|
case s_Auto:
|
|
case s_Max:
|
|
msyslog(LOG_INFO, "TRUE: state %s is unexpected!", stateStr(up->state));
|
|
}
|
|
break;
|
|
default:
|
|
abort();
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
#ifdef CLOCK_PPS720
|
|
if ((pp->sloppyclockflag & CLK_FLAG4) && !up->pcl720init) {
|
|
/* Make counter trigger on gate0, count down from 65535. */
|
|
pcl720_load(PCL720_IOB, PCL720_CTR, i8253_oneshot, 65535);
|
|
/*
|
|
* (These constants are OK since
|
|
* they represent hardware maximums.)
|
|
*/
|
|
NLOG(NLOG_CLOCKINFO) {
|
|
msyslog(LOG_NOTICE, "PCL-720 initialized");
|
|
}
|
|
up->pcl720init++;
|
|
}
|
|
#endif
|
|
|
|
|
|
}
|
|
|
|
/*
|
|
* true_poll - called by the transmit procedure
|
|
*/
|
|
static void
|
|
true_poll(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
struct true_unit *up;
|
|
struct refclockproc *pp;
|
|
|
|
/*
|
|
* You don't need to poll this clock. It puts out timecodes
|
|
* once per second. If asked for a timestamp, take note.
|
|
* The next time a timecode comes in, it will be fed back.
|
|
*/
|
|
pp = peer->procptr;
|
|
up = (struct true_unit *)pp->unitptr;
|
|
if (up->pollcnt > 0)
|
|
up->pollcnt--;
|
|
else {
|
|
true_doevent(peer, e_Init);
|
|
refclock_report(peer, CEVNT_TIMEOUT);
|
|
}
|
|
|
|
/*
|
|
* polled every 64 seconds. Ask true_receive to hand in a
|
|
* timestamp.
|
|
*/
|
|
up->polled = 1;
|
|
pp->polls++;
|
|
}
|
|
|
|
#ifdef CLOCK_PPS720
|
|
/*
|
|
* true_sample720 - sample the PCL-720
|
|
*/
|
|
static u_long
|
|
true_sample720(void)
|
|
{
|
|
unsigned long f;
|
|
|
|
/* We wire the PCL-720's 8253.OUT0 to bit 0 of connector 3.
|
|
* If it is not being held low now, we did not get called
|
|
* within 65535us.
|
|
*/
|
|
if (inb(pcl720_data_16_23(PCL720_IOB)) & 0x01) {
|
|
NLOG(NLOG_CLOCKINFO) {
|
|
msyslog(LOG_NOTICE, "PCL-720 out of synch");
|
|
}
|
|
return (0);
|
|
}
|
|
f = (65536 - pcl720_read(PCL720_IOB, PCL720_CTR));
|
|
#ifdef PPS720_DEBUG
|
|
msyslog(LOG_DEBUG, "PCL-720: %luus", f);
|
|
#endif
|
|
return (f);
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
int refclock_true_bs;
|
|
#endif /* REFCLOCK */
|