452 lines
13 KiB
C
452 lines
13 KiB
C
/*
|
|
* refclock_heath - clock driver for Heath GC-1000
|
|
* (but no longer the GC-1001 Model II, which apparently never worked)
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
# include <config.h>
|
|
#endif
|
|
|
|
#if defined(REFCLOCK) && defined(CLOCK_HEATH)
|
|
|
|
#include "ntpd.h"
|
|
#include "ntp_io.h"
|
|
#include "ntp_refclock.h"
|
|
#include "ntp_stdlib.h"
|
|
|
|
#include <stdio.h>
|
|
#include <ctype.h>
|
|
|
|
#ifdef HAVE_SYS_IOCTL_H
|
|
# include <sys/ioctl.h>
|
|
#endif /* not HAVE_SYS_IOCTL_H */
|
|
|
|
/*
|
|
* This driver supports the Heath GC-1000 Most Accurate Clock, with
|
|
* RS232C Output Accessory. This is a WWV/WWVH receiver somewhat less
|
|
* robust than other supported receivers. Its claimed accuracy is 100 ms
|
|
* when actually synchronized to the broadcast signal, but this doesn't
|
|
* happen even most of the time, due to propagation conditions, ambient
|
|
* noise sources, etc. When not synchronized, the accuracy is at the
|
|
* whim of the internal clock oscillator, which can wander into the
|
|
* sunset without warning. Since the indicated precision is 100 ms,
|
|
* expect a host synchronized only to this thing to wander to and fro,
|
|
* occasionally being rudely stepped when the offset exceeds the default
|
|
* clock_max of 128 ms.
|
|
*
|
|
* There were two GC-1000 versions supported by this driver. The original
|
|
* GC-1000 with RS-232 output first appeared in 1983, but dissapeared
|
|
* from the market a few years later. The GC-1001 II with RS-232 output
|
|
* first appeared circa 1990, but apparently is no longer manufactured.
|
|
* The two models differ considerably, both in interface and commands.
|
|
* The GC-1000 has a pseudo-bipolar timecode output triggered by a RTS
|
|
* transition. The timecode includes both the day of year and time of
|
|
* day. The GC-1001 II has a true bipolar output and a complement of
|
|
* single character commands. The timecode includes only the time of
|
|
* day.
|
|
*
|
|
* The GC-1001 II was apparently never tested and, based on a Coverity
|
|
* scan, apparently never worked [Bug 689]. Related code has been disabled.
|
|
*
|
|
* GC-1000
|
|
*
|
|
* The internal DIPswitches should be set to operate in MANUAL mode. The
|
|
* external DIPswitches should be set to GMT and 24-hour format.
|
|
*
|
|
* In MANUAL mode the clock responds to a rising edge of the request to
|
|
* send (RTS) modem control line by sending the timecode. Therefore, it
|
|
* is necessary that the operating system implement the TIOCMBIC and
|
|
* TIOCMBIS ioctl system calls and TIOCM_RTS control bit. Present
|
|
* restrictions require the use of a POSIX-compatible programming
|
|
* interface, although other interfaces may work as well.
|
|
*
|
|
* A simple hardware modification to the clock can be made which
|
|
* prevents the clock hearing the request to send (RTS) if the HI SPEC
|
|
* lamp is out. Route the HISPEC signal to the tone decoder board pin
|
|
* 19, from the display, pin 19. Isolate pin 19 of the decoder board
|
|
* first, but maintain connection with pin 10. Also isolate pin 38 of
|
|
* the CPU on the tone board, and use half an added 7400 to gate the
|
|
* original signal to pin 38 with that from pin 19.
|
|
*
|
|
* The clock message consists of 23 ASCII printing characters in the
|
|
* following format:
|
|
*
|
|
* hh:mm:ss.f AM dd/mm/yr<cr>
|
|
*
|
|
* hh:mm:ss.f = hours, minutes, seconds
|
|
* f = deciseconds ('?' when out of spec)
|
|
* AM/PM/bb = blank in 24-hour mode
|
|
* dd/mm/yr = day, month, year
|
|
*
|
|
* The alarm condition is indicated by '?', rather than a digit, at f.
|
|
* Note that 0?:??:??.? is displayed before synchronization is first
|
|
* established and hh:mm:ss.? once synchronization is established and
|
|
* then lost again for about a day.
|
|
*
|
|
* GC-1001 II
|
|
*
|
|
* Commands consist of a single letter and are case sensitive. When
|
|
* enterred in lower case, a description of the action performed is
|
|
* displayed. When enterred in upper case the action is performed.
|
|
* Following is a summary of descriptions as displayed by the clock:
|
|
*
|
|
* The clock responds with a command The 'A' command returns an ASCII
|
|
* local time string: HH:MM:SS.T xx<CR>, where
|
|
*
|
|
* HH = hours
|
|
* MM = minutes
|
|
* SS = seconds
|
|
* T = tenths-of-seconds
|
|
* xx = 'AM', 'PM', or ' '
|
|
* <CR> = carriage return
|
|
*
|
|
* The 'D' command returns 24 pairs of bytes containing the variable
|
|
* divisor value at the end of each of the previous 24 hours. This
|
|
* allows the timebase trimming process to be observed. UTC hour 00 is
|
|
* always returned first. The first byte of each pair is the high byte
|
|
* of (variable divisor * 16); the second byte is the low byte of
|
|
* (variable divisor * 16). For example, the byte pair 3C 10 would be
|
|
* returned for a divisor of 03C1 hex (961 decimal).
|
|
*
|
|
* The 'I' command returns: | TH | TL | ER | DH | DL | U1 | I1 | I2 | ,
|
|
* where
|
|
*
|
|
* TH = minutes since timebase last trimmed (high byte)
|
|
* TL = minutes since timebase last trimmed (low byte)
|
|
* ER = last accumulated error in 1.25 ms increments
|
|
* DH = high byte of (current variable divisor * 16)
|
|
* DL = low byte of (current variable divisor * 16)
|
|
* U1 = UT1 offset (/.1 s): | + | 4 | 2 | 1 | 0 | 0 | 0 | 0 |
|
|
* I1 = information byte 1: | W | C | D | I | U | T | Z | 1 | ,
|
|
* where
|
|
*
|
|
* W = set by WWV(H)
|
|
* C = CAPTURE LED on
|
|
* D = TRIM DN LED on
|
|
* I = HI SPEC LED on
|
|
* U = TRIM UP LED on
|
|
* T = DST switch on
|
|
* Z = UTC switch on
|
|
* 1 = UT1 switch on
|
|
*
|
|
* I2 = information byte 2: | 8 | 8 | 4 | 2 | 1 | D | d | S | ,
|
|
* where
|
|
*
|
|
* 8, 8, 4, 2, 1 = TIME ZONE switch settings
|
|
* D = DST bit (#55) in last-received frame
|
|
* d = DST bit (#2) in last-received frame
|
|
* S = clock is in simulation mode
|
|
*
|
|
* The 'P' command returns 24 bytes containing the number of frames
|
|
* received without error during UTC hours 00 through 23, providing an
|
|
* indication of hourly propagation. These bytes are updated each hour
|
|
* to reflect the previous 24 hour period. UTC hour 00 is always
|
|
* returned first.
|
|
*
|
|
* The 'T' command returns the UTC time: | HH | MM | SS | T0 | , where
|
|
* HH = tens-of-hours and hours (packed BCD)
|
|
* MM = tens-of-minutes and minutes (packed BCD)
|
|
* SS = tens-of-seconds and seconds (packed BCD)
|
|
* T = tenths-of-seconds (BCD)
|
|
*
|
|
* Fudge Factors
|
|
*
|
|
* A fudge time1 value of .04 s appears to center the clock offset
|
|
* residuals. The fudge time2 parameter is the local time offset east of
|
|
* Greenwich, which depends on DST. Sorry about that, but the clock
|
|
* gives no hint on what the DIPswitches say.
|
|
*/
|
|
|
|
/*
|
|
* Interface definitions
|
|
*/
|
|
#define DEVICE "/dev/heath%d" /* device name and unit */
|
|
#define PRECISION (-4) /* precision assumed (about 100 ms) */
|
|
#define REFID "WWV\0" /* reference ID */
|
|
#define DESCRIPTION "Heath GC-1000 Most Accurate Clock" /* WRU */
|
|
|
|
#define LENHEATH1 23 /* min timecode length */
|
|
#if 0 /* BUG 689 */
|
|
#define LENHEATH2 13 /* min timecode length */
|
|
#endif
|
|
|
|
/*
|
|
* Tables to compute the ddd of year form icky dd/mm timecode. Viva la
|
|
* leap.
|
|
*/
|
|
static int day1tab[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
|
|
static int day2tab[] = {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
|
|
|
|
/*
|
|
* Baud rate table. The GC-1000 supports 1200, 2400 and 4800; the
|
|
* GC-1001 II supports only 9600.
|
|
*/
|
|
static int speed[] = {B1200, B2400, B4800, B9600};
|
|
|
|
/*
|
|
* Function prototypes
|
|
*/
|
|
static int heath_start P((int, struct peer *));
|
|
static void heath_shutdown P((int, struct peer *));
|
|
static void heath_receive P((struct recvbuf *));
|
|
static void heath_poll P((int, struct peer *));
|
|
|
|
/*
|
|
* Transfer vector
|
|
*/
|
|
struct refclock refclock_heath = {
|
|
heath_start, /* start up driver */
|
|
heath_shutdown, /* shut down driver */
|
|
heath_poll, /* transmit poll message */
|
|
noentry, /* not used (old heath_control) */
|
|
noentry, /* initialize driver */
|
|
noentry, /* not used (old heath_buginfo) */
|
|
NOFLAGS /* not used */
|
|
};
|
|
|
|
|
|
/*
|
|
* heath_start - open the devices and initialize data for processing
|
|
*/
|
|
static int
|
|
heath_start(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
struct refclockproc *pp;
|
|
int fd;
|
|
char device[20];
|
|
|
|
/*
|
|
* Open serial port
|
|
*/
|
|
sprintf(device, DEVICE, unit);
|
|
if (!(fd = refclock_open(device, speed[peer->ttl & 0x3],
|
|
LDISC_REMOTE)))
|
|
return (0);
|
|
pp = peer->procptr;
|
|
pp->io.clock_recv = heath_receive;
|
|
pp->io.srcclock = (caddr_t)peer;
|
|
pp->io.datalen = 0;
|
|
pp->io.fd = fd;
|
|
if (!io_addclock(&pp->io)) {
|
|
(void) close(fd);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Initialize miscellaneous variables
|
|
*/
|
|
peer->precision = PRECISION;
|
|
peer->burst = NSTAGE;
|
|
pp->clockdesc = DESCRIPTION;
|
|
memcpy((char *)&pp->refid, REFID, 4);
|
|
return (1);
|
|
}
|
|
|
|
|
|
/*
|
|
* heath_shutdown - shut down the clock
|
|
*/
|
|
static void
|
|
heath_shutdown(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
struct refclockproc *pp;
|
|
|
|
pp = peer->procptr;
|
|
io_closeclock(&pp->io);
|
|
}
|
|
|
|
|
|
/*
|
|
* heath_receive - receive data from the serial interface
|
|
*/
|
|
static void
|
|
heath_receive(
|
|
struct recvbuf *rbufp
|
|
)
|
|
{
|
|
struct refclockproc *pp;
|
|
struct peer *peer;
|
|
l_fp trtmp;
|
|
int month, day;
|
|
int i;
|
|
char dsec, a[5];
|
|
|
|
/*
|
|
* Initialize pointers and read the timecode and timestamp
|
|
*/
|
|
peer = (struct peer *)rbufp->recv_srcclock;
|
|
pp = peer->procptr;
|
|
pp->lencode = refclock_gtlin(rbufp, pp->a_lastcode, BMAX,
|
|
&trtmp);
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
switch (pp->lencode) {
|
|
|
|
/*
|
|
* GC-1000 timecode format: "hh:mm:ss.f AM mm/dd/yy"
|
|
* GC-1001 II timecode format: "hh:mm:ss.f "
|
|
*/
|
|
case LENHEATH1:
|
|
if (sscanf(pp->a_lastcode,
|
|
"%2d:%2d:%2d.%c%5c%2d/%2d/%2d", &pp->hour,
|
|
&pp->minute, &pp->second, &dsec, a, &month, &day,
|
|
&pp->year) != 8) {
|
|
refclock_report(peer, CEVNT_BADREPLY);
|
|
return;
|
|
}
|
|
break;
|
|
|
|
#if 0 /* BUG 689 */
|
|
/*
|
|
* GC-1001 II timecode format: "hh:mm:ss.f "
|
|
*/
|
|
case LENHEATH2:
|
|
if (sscanf(pp->a_lastcode, "%2d:%2d:%2d.%c", &pp->hour,
|
|
&pp->minute, &pp->second, &dsec) != 4) {
|
|
refclock_report(peer, CEVNT_BADREPLY);
|
|
return;
|
|
} else {
|
|
struct tm *tm_time_p;
|
|
time_t now;
|
|
|
|
time(&now); /* we should grab 'now' earlier */
|
|
tm_time_p = gmtime(&now);
|
|
/*
|
|
* There is a window of time around midnight
|
|
* where this will Do The Wrong Thing.
|
|
*/
|
|
if (tm_time_p) {
|
|
month = tm_time_p->tm_mon + 1;
|
|
day = tm_time_p->tm_mday;
|
|
} else {
|
|
refclock_report(peer, CEVNT_FAULT);
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
refclock_report(peer, CEVNT_BADREPLY);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* We determine the day of the year from the DIPswitches. This
|
|
* should be fixed, since somebody might forget to set them.
|
|
* Someday this hazard will be fixed by a fiendish scheme that
|
|
* looks at the timecode and year the radio shows, then computes
|
|
* the residue of the seconds mod the seconds in a leap cycle.
|
|
* If in the third year of that cycle and the third and later
|
|
* months of that year, add one to the day. Then, correct the
|
|
* timecode accordingly. Icky pooh. This bit of nonsense could
|
|
* be avoided if the engineers had been required to write a
|
|
* device driver before finalizing the timecode format.
|
|
*/
|
|
if (month < 1 || month > 12 || day < 1) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
return;
|
|
}
|
|
if (pp->year % 4) {
|
|
if (day > day1tab[month - 1]) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
return;
|
|
}
|
|
for (i = 0; i < month - 1; i++)
|
|
day += day1tab[i];
|
|
} else {
|
|
if (day > day2tab[month - 1]) {
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
return;
|
|
}
|
|
for (i = 0; i < month - 1; i++)
|
|
day += day2tab[i];
|
|
}
|
|
pp->day = day;
|
|
|
|
/*
|
|
* Determine synchronization and last update
|
|
*/
|
|
if (!isdigit((int)dsec))
|
|
pp->leap = LEAP_NOTINSYNC;
|
|
else {
|
|
pp->nsec = (dsec - '0') * 100000000;
|
|
pp->leap = LEAP_NOWARNING;
|
|
}
|
|
if (!refclock_process(pp))
|
|
refclock_report(peer, CEVNT_BADTIME);
|
|
}
|
|
|
|
|
|
/*
|
|
* heath_poll - called by the transmit procedure
|
|
*/
|
|
static void
|
|
heath_poll(
|
|
int unit,
|
|
struct peer *peer
|
|
)
|
|
{
|
|
struct refclockproc *pp;
|
|
int bits = TIOCM_RTS;
|
|
|
|
/*
|
|
* At each poll we check for timeout and toggle the RTS modem
|
|
* control line, then take a timestamp. Presumably, this is the
|
|
* event the radio captures to generate the timecode.
|
|
* Apparently, the radio takes about a second to make up its
|
|
* mind to send a timecode, so the receive timestamp is
|
|
* worthless.
|
|
*/
|
|
pp = peer->procptr;
|
|
|
|
/*
|
|
* We toggle the RTS modem control lead (GC-1000) and sent a T
|
|
* (GC-1001 II) to kick a timecode loose from the radio. This
|
|
* code works only for POSIX and SYSV interfaces. With bsd you
|
|
* are on your own. We take a timestamp between the up and down
|
|
* edges to lengthen the pulse, which should be about 50 usec on
|
|
* a Sun IPC. With hotshot CPUs, the pulse might get too short.
|
|
* Later.
|
|
*
|
|
* Bug 689: Even though we no longer support the GC-1001 II,
|
|
* I'm leaving the 'T' write in for timing purposes.
|
|
*/
|
|
if (ioctl(pp->io.fd, TIOCMBIC, (char *)&bits) < 0)
|
|
refclock_report(peer, CEVNT_FAULT);
|
|
get_systime(&pp->lastrec);
|
|
if (write(pp->io.fd, "T", 1) != 1)
|
|
refclock_report(peer, CEVNT_FAULT);
|
|
ioctl(pp->io.fd, TIOCMBIS, (char *)&bits);
|
|
if (peer->burst > 0)
|
|
return;
|
|
if (pp->coderecv == pp->codeproc) {
|
|
refclock_report(peer, CEVNT_TIMEOUT);
|
|
return;
|
|
}
|
|
pp->lastref = pp->lastrec;
|
|
refclock_receive(peer);
|
|
record_clock_stats(&peer->srcadr, pp->a_lastcode);
|
|
#ifdef DEBUG
|
|
if (debug)
|
|
printf("heath: timecode %d %s\n", pp->lencode,
|
|
pp->a_lastcode);
|
|
#endif
|
|
peer->burst = MAXSTAGE;
|
|
pp->polls++;
|
|
}
|
|
|
|
#else
|
|
int refclock_heath_bs;
|
|
#endif /* REFCLOCK */
|