499 lines
13 KiB
C
499 lines
13 KiB
C
/*
|
|
* refclock_ulink - clock driver for Ultralink WWVB receiver
|
|
*
|
|
*/
|
|
|
|
/***********************************************************************
|
|
* *
|
|
* Copyright (c) David L. Mills 1992-1998 *
|
|
* *
|
|
* Permission to use, copy, modify, and distribute this software and *
|
|
* its documentation for any purpose and without fee is hereby *
|
|
* granted, provided that the above copyright notice appears in all *
|
|
* copies and that both the copyright notice and this permission *
|
|
* notice appear in supporting documentation, and that the name *
|
|
* University of Delaware not be used in advertising or publicity *
|
|
* pertaining to distribution of the software without specific, *
|
|
* written prior permission. The University of Delaware makes no *
|
|
* representations about the suitability this software for any *
|
|
* purpose. It is provided "as is" without express or implied *
|
|
* warranty. *
|
|
**********************************************************************/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include <config.h>
|
|
#endif
|
|
|
|
#if defined(REFCLOCK) && defined(CLOCK_ULINK)
|
|
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
#include "ntpd.h"
|
|
#include "ntp_io.h"
|
|
#include "ntp_refclock.h"
|
|
#include "ntp_calendar.h"
|
|
#include "ntp_stdlib.h"
|
|
|
|
/*
|
|
* This driver supports ultralink Model 320,330,331,332 WWVB radios
|
|
*
|
|
* this driver was based on the refclock_wwvb.c driver
|
|
* in the ntp distribution.
|
|
*
|
|
* Fudge Factors
|
|
*
|
|
* fudge flag1 0 don't poll clock
|
|
* 1 send poll character
|
|
*
|
|
* revision history:
|
|
* 99/9/09 j.c.lang original edit's
|
|
* 99/9/11 j.c.lang changed timecode parse to
|
|
* match what the radio actually
|
|
* sends.
|
|
* 99/10/11 j.c.lang added support for continous
|
|
* time code mode (dipsw2)
|
|
* 99/11/26 j.c.lang added support for 320 decoder
|
|
* (taken from Dave Strout's
|
|
* Model 320 driver)
|
|
* 99/11/29 j.c.lang added fudge flag 1 to control
|
|
* clock polling
|
|
* 99/12/15 j.c.lang fixed 320 quality flag
|
|
* 01/02/21 s.l.smith fixed 33x quality flag
|
|
* added more debugging stuff
|
|
* updated 33x time code explanation
|
|
*
|
|
* Questions, bugs, ideas send to:
|
|
* Joseph C. Lang
|
|
* tcnojl1@earthlink.net
|
|
*
|
|
* Dave Strout
|
|
* dstrout@linuxfoundry.com
|
|
*
|
|
*
|
|
* on the Ultralink model 33X decoder Dip switch 2 controls
|
|
* polled or continous timecode
|
|
* set fudge flag1 if using polled (needed for model 320)
|
|
* dont set fudge flag1 if dip switch 2 is set on model 33x decoder
|
|
*/
|
|
|
|
|
|
/*
|
|
* Interface definitions
|
|
*/
|
|
#define DEVICE "/dev/wwvb%d" /* device name and unit */
|
|
#define SPEED232 B9600 /* uart speed (9600 baud) */
|
|
#define PRECISION (-10) /* precision assumed (about 10 ms) */
|
|
#define REFID "WWVB" /* reference ID */
|
|
#define DESCRIPTION "Ultralink WWVB Receiver" /* WRU */
|
|
|
|
#define LEN33X 32 /* timecode length Model 325 & 33X */
|
|
#define LEN320 24 /* timecode length Model 320 */
|
|
|
|
/*
|
|
* unit control structure
|
|
*/
|
|
struct ulinkunit {
|
|
u_char tcswitch; /* timecode switch */
|
|
l_fp laststamp; /* last receive timestamp */
|
|
};
|
|
|
|
/*
|
|
* Function prototypes
|
|
*/
|
|
static int ulink_start P((int, struct peer *));
|
|
static void ulink_shutdown P((int, struct peer *));
|
|
static void ulink_receive P((struct recvbuf *));
|
|
static void ulink_poll P((int, struct peer *));
|
|
|
|
/*
|
|
* Transfer vector
|
|
*/
|
|
struct refclock refclock_ulink = {
|
|
ulink_start, /* start up driver */
|
|
ulink_shutdown, /* shut down driver */
|
|
ulink_poll, /* transmit poll message */
|
|
noentry, /* not used */
|
|
noentry, /* not used */
|
|
noentry, /* not used */
|
|
NOFLAGS
|
|
};
|
|
|
|
|
|
/*
|
|
* ulink_start - open the devices and initialize data for processing
|
|
*/
|
|
static int
|
|
ulink_start(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
register struct ulinkunit *up;
|
|
struct refclockproc *pp;
|
|
int fd;
|
|
char device[20];
|
|
|
|
/*
|
|
* Open serial port. Use CLK line discipline, if available.
|
|
*/
|
|
(void)sprintf(device, DEVICE, unit);
|
|
if (!(fd = refclock_open(device, SPEED232, LDISC_CLK)))
|
|
return (0);
|
|
|
|
/*
|
|
* Allocate and initialize unit structure
|
|
*/
|
|
if (!(up = (struct ulinkunit *)
|
|
emalloc(sizeof(struct ulinkunit)))) {
|
|
(void) close(fd);
|
|
return (0);
|
|
}
|
|
memset((char *)up, 0, sizeof(struct ulinkunit));
|
|
pp = peer->procptr;
|
|
pp->unitptr = (caddr_t)up;
|
|
pp->io.clock_recv = ulink_receive;
|
|
pp->io.srcclock = (caddr_t)peer;
|
|
pp->io.datalen = 0;
|
|
pp->io.fd = fd;
|
|
if (!io_addclock(&pp->io)) {
|
|
(void) close(fd);
|
|
free(up);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize miscellaneous variables
|
|
*/
|
|
peer->precision = PRECISION;
|
|
peer->burst = NSTAGE;
|
|
pp->clockdesc = DESCRIPTION;
|
|
memcpy((char *)&pp->refid, REFID, 4);
|
|
return (1);
|
|
}
|
|
|
|
|
|
/*
|
|
* ulink_shutdown - shut down the clock
|
|
*/
|
|
static void
|
|
ulink_shutdown(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
register struct ulinkunit *up;
|
|
struct refclockproc *pp;
|
|
|
|
pp = peer->procptr;
|
|
up = (struct ulinkunit *)pp->unitptr;
|
|
io_closeclock(&pp->io);
|
|
free(up);
|
|
}
|
|
|
|
|
|
/*
|
|
* ulink_receive - receive data from the serial interface
|
|
*/
|
|
static void
|
|
ulink_receive(
|
|
struct recvbuf *rbufp
|
|
)
|
|
{
|
|
struct ulinkunit *up;
|
|
struct refclockproc *pp;
|
|
struct peer *peer;
|
|
|
|
l_fp trtmp; /* arrival timestamp */
|
|
int quality; /* quality indicator */
|
|
int temp; /* int temp */
|
|
char syncchar; /* synchronization indicator */
|
|
char leapchar; /* leap indicator */
|
|
char modechar; /* model 320 mode flag */
|
|
char char_quality[2]; /* temp quality flag */
|
|
|
|
/*
|
|
* Initialize pointers and read the timecode and timestamp
|
|
*/
|
|
peer = (struct peer *)rbufp->recv_srcclock;
|
|
pp = peer->procptr;
|
|
up = (struct ulinkunit *)pp->unitptr;
|
|
temp = refclock_gtlin(rbufp, pp->a_lastcode, BMAX, &trtmp);
|
|
|
|
/*
|
|
* Note we get a buffer and timestamp for both a <cr> and <lf>,
|
|
* but only the <cr> timestamp is retained.
|
|
*/
|
|
if (temp == 0) {
|
|
if (up->tcswitch == 0) {
|
|
up->tcswitch = 1;
|
|
up->laststamp = trtmp;
|
|
} else
|
|
up->tcswitch = 0;
|
|
return;
|
|
}
|
|
pp->lencode = temp;
|
|
pp->lastrec = up->laststamp;
|
|
up->laststamp = trtmp;
|
|
up->tcswitch = 1;
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf("ulink: timecode %d %s\n", pp->lencode,
|
|
pp->a_lastcode);
|
|
#endif
|
|
|
|
/*
|
|
* We get down to business, check the timecode format and decode
|
|
* its contents. If the timecode has invalid length or is not in
|
|
* proper format, we declare bad format and exit.
|
|
*/
|
|
syncchar = leapchar = modechar = ' ';
|
|
pp->msec = 0;
|
|
|
|
switch (pp->lencode ) {
|
|
case LEN33X:
|
|
/*
|
|
* Model 33X decoder:
|
|
* Timecode format from January 29, 2001 datasheet is:
|
|
* <CR><LF>S9+D 00 YYYY+DDDUTCS HH:MM:SSL+5
|
|
* S WWVB decoder sync indicator. S for in-sync(?)
|
|
* or N for noisy signal.
|
|
* 9+ RF signal level in S-units, 0-9 followed by
|
|
* a space (0x20). The space turns to '+' if the
|
|
* level is over 9.
|
|
* D Data bit 0, 1, 2 (position mark), or
|
|
* 3 (unknown).
|
|
* space Space character (0x20)
|
|
* 00 Hours since last good WWVB frame sync. Will
|
|
* be 00-23 hrs, or '1d' to '7d'. Will be 'Lk'
|
|
* if currently in sync.
|
|
* space Space character (0x20)
|
|
* YYYY Current year, 1990-2089
|
|
* + Leap year indicator. '+' if a leap year,
|
|
* a space (0x20) if not.
|
|
* DDD Day of year, 001 - 366.
|
|
* UTC Timezone (always 'UTC').
|
|
* S Daylight savings indicator
|
|
* S - standard time (STD) in effect
|
|
* O - during STD to DST day 0000-2400
|
|
* D - daylight savings time (DST) in effect
|
|
* I - during DST to STD day 0000-2400
|
|
* space Space character (0x20)
|
|
* HH Hours 00-23
|
|
* : This is the REAL in sync indicator (: = insync)
|
|
* MM Minutes 00-59
|
|
* : : = in sync ? = NOT in sync
|
|
* SS Seconds 00-59
|
|
* L Leap second flag. Changes from space (0x20)
|
|
* to '+' or '-' during month preceding leap
|
|
* second adjustment.
|
|
* +5 UT1 correction (sign + digit ))
|
|
*/
|
|
|
|
if (sscanf(pp->a_lastcode,
|
|
"%*4c %2c %4d%*c%3d%*4c %2d%c%2d:%2d%c%*2c",
|
|
char_quality, &pp->year, &pp->day,
|
|
&pp->hour, &syncchar, &pp->minute, &pp->second,
|
|
&leapchar) == 8) {
|
|
|
|
if (char_quality[0] == 'L') {
|
|
quality = 0;
|
|
} else if (char_quality[0] == '0') {
|
|
quality = (char_quality[1] & 0x0f);
|
|
} else {
|
|
quality = 99;
|
|
}
|
|
|
|
/*
|
|
#ifdef DEBUG
|
|
if (debug) {
|
|
printf("ulink: char_quality %c %c\n",
|
|
char_quality[0], char_quality[1]);
|
|
printf("ulink: quality %d\n", quality);
|
|
printf("ulink: syncchar %x\n", syncchar);
|
|
printf("ulink: leapchar %x\n", leapchar);
|
|
}
|
|
#endif
|
|
*/
|
|
|
|
break;
|
|
}
|
|
|
|
case LEN320:
|
|
/*
|
|
* Model 320 Decoder
|
|
* The timecode format is:
|
|
*
|
|
* <cr><lf>SQRYYYYDDD+HH:MM:SS.mmLT<cr>
|
|
*
|
|
* where:
|
|
*
|
|
* S = 'S' -- sync'd in last hour,
|
|
* '0'-'9' - hours x 10 since last update,
|
|
* '?' -- not in sync
|
|
* Q = Number of correlating time-frames, from 0 to 5
|
|
* R = 'R' -- reception in progress,
|
|
* 'N' -- Noisy reception,
|
|
* ' ' -- standby mode
|
|
* YYYY = year from 1990 to 2089
|
|
* DDD = current day from 1 to 366
|
|
* + = '+' if current year is a leap year, else ' '
|
|
* HH = UTC hour 0 to 23
|
|
* MM = Minutes of current hour from 0 to 59
|
|
* SS = Seconds of current minute from 0 to 59
|
|
* mm = 10's milliseconds of the current second from 00 to 99
|
|
* L = Leap second pending at end of month
|
|
* 'I' = insert, 'D'= delete
|
|
* T = DST <-> STD transition indicators
|
|
*
|
|
*/
|
|
if (sscanf(pp->a_lastcode, "%c%1d%c%4d%3d%*c%2d:%2d:%2d.%2d%c",
|
|
&syncchar, &quality, &modechar, &pp->year, &pp->day,
|
|
&pp->hour, &pp->minute, &pp->second,
|
|
&pp->msec,&leapchar) == 10) {
|
|
pp->msec *= 10; /* M320 returns 10's of msecs */
|
|
if (leapchar == 'I' ) leapchar = '+';
|
|
if (leapchar == 'D' ) leapchar = '-';
|
|
if (syncchar != '?' ) syncchar = ':';
|
|
|
|
break;
|
|
}
|
|
|
|
default:
|
|
refclock_report(peer, CEVNT_BADREPLY);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* Decode quality indicator
|
|
* For the 325 & 33x series, the lower the number the "better"
|
|
* the time is. I used the dispersion as the measure of time
|
|
* quality. The quality indicator in the 320 is the number of
|
|
* correlating time frames (the more the better)
|
|
*/
|
|
|
|
/*
|
|
* The spec sheet for the 325 & 33x series states the clock will
|
|
* maintain +/-0.002 seconds accuracy when locked to WWVB. This
|
|
* is indicated by 'Lk' in the quality portion of the incoming
|
|
* string. When not in lock, a drift of +/-0.015 seconds should
|
|
* be allowed for.
|
|
* With the quality indicator decoding scheme above, the 'Lk'
|
|
* condition will produce a quality value of 0. If the quality
|
|
* indicator starts with '0' then the second character is the
|
|
* number of hours since we were last locked. If the first
|
|
* character is anything other than 'L' or '0' then we have been
|
|
* out of lock for more than 9 hours so we assume the worst and
|
|
* force a quality value that selects the 'default' maximum
|
|
* dispersion. The dispersion values below are what came with the
|
|
* driver. They're not unreasonable so they've not been changed.
|
|
*/
|
|
|
|
if (pp->lencode == LEN33X) {
|
|
switch (quality) {
|
|
case 0 :
|
|
pp->disp=.002;
|
|
break;
|
|
case 1 :
|
|
pp->disp=.02;
|
|
break;
|
|
case 2 :
|
|
pp->disp=.04;
|
|
break;
|
|
case 3 :
|
|
pp->disp=.08;
|
|
break;
|
|
default:
|
|
pp->disp=MAXDISPERSE;
|
|
break;
|
|
}
|
|
} else {
|
|
switch (quality) {
|
|
case 5 :
|
|
pp->disp=.002;
|
|
break;
|
|
case 4 :
|
|
pp->disp=.02;
|
|
break;
|
|
case 3 :
|
|
pp->disp=.04;
|
|
break;
|
|
case 2 :
|
|
pp->disp=.08;
|
|
break;
|
|
case 1 :
|
|
pp->disp=.16;
|
|
break;
|
|
default:
|
|
pp->disp=MAXDISPERSE;
|
|
break;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Decode synchronization, and leap characters. If
|
|
* unsynchronized, set the leap bits accordingly and exit.
|
|
* Otherwise, set the leap bits according to the leap character.
|
|
*/
|
|
|
|
if (syncchar != ':')
|
|
pp->leap = LEAP_NOTINSYNC;
|
|
else if (leapchar == '+')
|
|
pp->leap = LEAP_ADDSECOND;
|
|
else if (leapchar == '-')
|
|
pp->leap = LEAP_DELSECOND;
|
|
else
|
|
pp->leap = LEAP_NOWARNING;
|
|
|
|
/*
|
|
* Process the new sample in the median filter and determine the
|
|
* timecode timestamp.
|
|
*/
|
|
if (!refclock_process(pp)) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
}
|
|
|
|
}
|
|
|
|
|
|
/*
|
|
* ulink_poll - called by the transmit procedure
|
|
*/
|
|
static void
|
|
ulink_poll(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
struct refclockproc *pp;
|
|
char pollchar;
|
|
|
|
pp = peer->procptr;
|
|
pollchar = 'T';
|
|
if (pp->sloppyclockflag & CLK_FLAG1) {
|
|
if (write(pp->io.fd, &pollchar, 1) != 1)
|
|
refclock_report(peer, CEVNT_FAULT);
|
|
else
|
|
pp->polls++;
|
|
}
|
|
else
|
|
pp->polls++;
|
|
|
|
if (peer->burst > 0)
|
|
return;
|
|
if (pp->coderecv == pp->codeproc) {
|
|
refclock_report(peer, CEVNT_TIMEOUT);
|
|
return;
|
|
}
|
|
record_clock_stats(&peer->srcadr, pp->a_lastcode);
|
|
refclock_receive(peer);
|
|
peer->burst = NSTAGE;
|
|
|
|
}
|
|
|
|
#else
|
|
int refclock_ulink_bs;
|
|
#endif /* REFCLOCK */
|