Revision 5bac3921852a040541569ff73ed0401fb6d17aa4 authored by Maxim Konovalov on 21 April 2006, 18:48:36 UTC, committed by Maxim Konovalov on 21 April 2006, 18:48:36 UTC
Approved by: so (cperciva)
1 parent e8062dd
clk_trimtsip.c
/*
* /src/NTP/ntp-4/libparse/clk_trimtsip.c,v 4.13 1999/11/28 09:13:51 kardel RELEASE_19991128_A
*
* clk_trimtsip.c,v 4.13 1999/11/28 09:13:51 kardel RELEASE_19991128_A
*
* Trimble TSIP support - CURRENTLY VERY MUCH UNDER CONSTRUCTION
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#if defined(REFCLOCK) && defined(CLOCK_PARSE) && defined(CLOCK_TRIMTSIP)
#include "ntp_syslog.h"
#include "ntp_types.h"
#include "ntp_fp.h"
#include "ntp_unixtime.h"
#include "ntp_calendar.h"
#include "ntp_machine.h"
#include "ntp_stdlib.h"
#include "parse.h"
#ifndef PARSESTREAM
# include <stdio.h>
#else
# include "sys/parsestreams.h"
#endif
#include "ascii.h"
#include "binio.h"
#include "ieee754io.h"
#include "trimble.h"
/*
* Trimble low level TSIP parser / time converter
*
* The receiver uses a serial message protocol called Trimble Standard
* Interface Protocol (it can support others but this driver only supports
* TSIP). Messages in this protocol have the following form:
*
* <DLE><id> ... <data> ... <DLE><ETX>
*
* Any bytes within the <data> portion of value 10 hex (<DLE>) are doubled
* on transmission and compressed back to one on reception. Otherwise
* the values of data bytes can be anything. The serial interface is RS-422
* asynchronous using 9600 baud, 8 data bits with odd party (**note** 9 bits
* in total!), and 1 stop bit. The protocol supports byte, integer, single,
* and double datatypes. Integers are two bytes, sent most significant first.
* Singles are IEEE754 single precision floating point numbers (4 byte) sent
* sign & exponent first. Doubles are IEEE754 double precision floating point
* numbers (8 byte) sent sign & exponent first.
* The receiver supports a large set of messages, only a very small subset of
* which is used here.
*
* From this module the following are recognised:
*
* ID Description
*
* 41 GPS Time
* 46 Receiver health
* 4F UTC correction data (used to get leap second warnings)
*
* All others are accepted but ignored for time conversion - they are passed up to higher layers.
*
*/
static offsets_t trim_offsets = { 0, 1, 2, 3, 4, 5, 6, 7 };
struct trimble
{
u_char t_in_pkt; /* first DLE received */
u_char t_dle; /* subsequent DLE received */
u_short t_week; /* GPS week */
u_short t_weekleap; /* GPS week of next/last week */
u_short t_dayleap; /* day in week */
u_short t_gpsutc; /* GPS - UTC offset */
u_short t_gpsutcleap; /* offset at next/last leap */
u_char t_operable; /* receiver feels OK */
u_char t_mode; /* actual operating mode */
u_char t_leap; /* possible leap warning */
u_char t_utcknown; /* utc offset known */
};
#define STATUS_BAD 0 /* BAD or UNINITIALIZED receiver status */
#define STATUS_UNSAFE 1 /* not enough receivers for full precision */
#define STATUS_SYNC 2 /* enough information for good operation */
static unsigned long inp_tsip P((parse_t *, unsigned int, timestamp_t *));
static unsigned long cvt_trimtsip P((unsigned char *, int, struct format *, clocktime_t *, void *));
struct clockformat clock_trimtsip =
{
inp_tsip, /* Trimble TSIP input handler */
cvt_trimtsip, /* Trimble TSIP conversion */
pps_one, /* easy PPS monitoring */
0, /* no configuration data */
"Trimble TSIP",
400, /* input buffer */
sizeof(struct trimble) /* private data */
};
#define ADDSECOND 0x01
#define DELSECOND 0x02
static unsigned long
inp_tsip(
parse_t *parseio,
unsigned int ch,
timestamp_t *tstamp
)
{
struct trimble *t = (struct trimble *)parseio->parse_pdata;
if (!t)
return PARSE_INP_SKIP; /* local data not allocated - sigh! */
if (!t->t_in_pkt && ch != DLE) {
/* wait for start of packet */
return PARSE_INP_SKIP;
}
if ((parseio->parse_index >= (parseio->parse_dsize - 2)) ||
(parseio->parse_dtime.parse_msglen >= (sizeof(parseio->parse_dtime.parse_msg) - 2)))
{ /* OVERFLOW - DROP! */
t->t_in_pkt = t->t_dle = 0;
parseio->parse_index = 0;
parseio->parse_dtime.parse_msglen = 0;
return PARSE_INP_SKIP;
}
switch (ch) {
case DLE:
if (!t->t_in_pkt) {
t->t_dle = 0;
t->t_in_pkt = 1;
parseio->parse_index = 0;
parseio->parse_data[parseio->parse_index++] = ch;
parseio->parse_dtime.parse_msglen = 0;
parseio->parse_dtime.parse_msg[parseio->parse_dtime.parse_msglen++] = ch;
parseio->parse_dtime.parse_stime = *tstamp; /* pick up time stamp at packet start */
} else if (t->t_dle) {
/* Double DLE -> insert a DLE */
t->t_dle = 0;
parseio->parse_data[parseio->parse_index++] = DLE;
parseio->parse_dtime.parse_msg[parseio->parse_dtime.parse_msglen++] = DLE;
} else
t->t_dle = 1;
break;
case ETX:
if (t->t_dle) {
/* DLE,ETX -> end of packet */
parseio->parse_data[parseio->parse_index++] = DLE;
parseio->parse_data[parseio->parse_index] = ch;
parseio->parse_ldsize = parseio->parse_index+1;
memcpy(parseio->parse_ldata, parseio->parse_data, parseio->parse_ldsize);
parseio->parse_dtime.parse_msg[parseio->parse_dtime.parse_msglen++] = DLE;
parseio->parse_dtime.parse_msg[parseio->parse_dtime.parse_msglen++] = ch;
t->t_in_pkt = t->t_dle = 0;
return PARSE_INP_TIME|PARSE_INP_DATA;
}
default: /* collect data */
t->t_dle = 0;
parseio->parse_data[parseio->parse_index++] = ch;
parseio->parse_dtime.parse_msg[parseio->parse_dtime.parse_msglen++] = ch;
}
return PARSE_INP_SKIP;
}
static int
getshort(
unsigned char *p
)
{
return get_msb_short(&p);
}
/*
* cvt_trimtsip
*
* convert TSIP type format
*/
static unsigned long
cvt_trimtsip(
unsigned char *buffer,
int size,
struct format *format,
clocktime_t *clock_time,
void *local
)
{
register struct trimble *t = (struct trimble *)local; /* get local data space */
#define mb(_X_) (buffer[2+(_X_)]) /* shortcut for buffer access */
register u_char cmd;
clock_time->flags = 0;
if (!t) {
return CVT_NONE; /* local data not allocated - sigh! */
}
if ((size < 4) ||
(buffer[0] != DLE) ||
(buffer[size-1] != ETX) ||
(buffer[size-2] != DLE))
{
printf("TRIMBLE BAD packet, size %d:\n", size);
return CVT_NONE;
}
else
{
unsigned char *bp;
cmd = buffer[1];
switch(cmd)
{
case CMD_RCURTIME:
{ /* GPS time */
l_fp secs;
int week = getshort((unsigned char *)&mb(4));
l_fp utcoffset;
l_fp gpstime;
bp = &mb(0);
if (fetch_ieee754(&bp, IEEE_SINGLE, &secs, trim_offsets) != IEEE_OK)
return CVT_FAIL|CVT_BADFMT;
if ((secs.l_i <= 0) ||
(t->t_utcknown == 0))
{
clock_time->flags = PARSEB_POWERUP;
return CVT_OK;
}
if (week < 990) {
week += 1024;
}
/* time OK */
/* fetch UTC offset */
bp = &mb(6);
if (fetch_ieee754(&bp, IEEE_SINGLE, &utcoffset, trim_offsets) != IEEE_OK)
return CVT_FAIL|CVT_BADFMT;
L_SUB(&secs, &utcoffset); /* adjust GPS time to UTC time */
gpstolfp((unsigned short)week, (unsigned short)0,
secs.l_ui, &gpstime);
gpstime.l_uf = secs.l_uf;
clock_time->utctime = gpstime.l_ui - JAN_1970;
TSFTOTVU(gpstime.l_uf, clock_time->usecond);
if (t->t_leap == ADDSECOND)
clock_time->flags |= PARSEB_LEAPADD;
if (t->t_leap == DELSECOND)
clock_time->flags |= PARSEB_LEAPDEL;
switch (t->t_operable)
{
case STATUS_SYNC:
clock_time->flags &= ~(PARSEB_POWERUP|PARSEB_NOSYNC);
break;
case STATUS_UNSAFE:
clock_time->flags |= PARSEB_NOSYNC;
break;
case STATUS_BAD:
clock_time->flags |= PARSEB_NOSYNC|PARSEB_POWERUP;
break;
}
if (t->t_mode == 0)
clock_time->flags |= PARSEB_POSITION;
clock_time->flags |= PARSEB_S_LEAP|PARSEB_S_POSITION;
return CVT_OK;
} /* case 0x41 */
case CMD_RRECVHEALTH:
{
/* TRIMBLE health */
u_char status = mb(0);
switch (status)
{
case 0x00: /* position fixes */
t->t_operable = STATUS_SYNC;
break;
case 0x09: /* 1 satellite */
case 0x0A: /* 2 satellites */
case 0x0B: /* 3 satellites */
t->t_operable = STATUS_UNSAFE;
break;
default:
t->t_operable = STATUS_BAD;
break;
}
t->t_mode = status;
}
break;
case CMD_RUTCPARAM:
{
l_fp t0t;
unsigned char *lbp;
/* UTC correction data - derive a leap warning */
int tls = t->t_gpsutc = getshort((unsigned char *)&mb(12)); /* current leap correction (GPS-UTC) */
int tlsf = t->t_gpsutcleap = getshort((unsigned char *)&mb(24)); /* new leap correction */
t->t_weekleap = getshort((unsigned char *)&mb(20)); /* week no of leap correction */
if (t->t_weekleap < 990)
t->t_weekleap += 1024;
t->t_dayleap = getshort((unsigned char *)&mb(22)); /* day in week of leap correction */
t->t_week = getshort((unsigned char *)&mb(18)); /* current week no */
if (t->t_week < 990)
t->t_week += 1024;
lbp = (unsigned char *)&mb(14); /* last update time */
if (fetch_ieee754(&lbp, IEEE_SINGLE, &t0t, trim_offsets) != IEEE_OK)
return CVT_FAIL|CVT_BADFMT;
t->t_utcknown = t0t.l_ui != 0;
if ((t->t_utcknown) && /* got UTC information */
(tlsf != tls) && /* something will change */
((t->t_weekleap - t->t_week) < 5)) /* and close in the future */
{
/* generate a leap warning */
if (tlsf > tls)
t->t_leap = ADDSECOND;
else
t->t_leap = DELSECOND;
}
else
{
t->t_leap = 0;
}
}
break;
default:
/* it's validly formed, but we don't care about it! */
break;
}
}
return CVT_SKIP;
}
#else /* not (REFCLOCK && CLOCK_PARSE && CLOCK_TRIMTSIP && !PARSESTREAM) */
int clk_trimtsip_bs;
#endif /* not (REFCLOCK && CLOCK_PARSE && CLOCK_TRIMTSIP && !PARSESTREAM) */
/*
* History:
*
* clk_trimtsip.c,v
* Revision 4.13 1999/11/28 09:13:51 kardel
* RECON_4_0_98F
*
* Revision 4.12 1999/02/28 13:00:08 kardel
* *** empty log message ***
*
* Revision 4.11 1999/02/28 11:47:54 kardel
* (struct trimble): new member t_utcknown
* (cvt_trimtsip): fixed status monitoring, bad receiver states are
* now recognized
*
* Revision 4.10 1999/02/27 15:57:15 kardel
* use mmemcpy instead of bcopy
*
* Revision 4.9 1999/02/21 12:17:42 kardel
* 4.91f reconcilation
*
* Revision 4.8 1998/11/15 20:27:58 kardel
* Release 4.0.73e13 reconcilation
*
* Revision 4.7 1998/08/16 18:49:20 kardel
* (cvt_trimtsip): initial kernel capable version (no more floats)
* (clock_trimtsip =): new format name
*
* Revision 4.6 1998/08/09 22:26:05 kardel
* Trimble TSIP support
*
* Revision 4.5 1998/08/02 10:37:05 kardel
* working TSIP parser
*
* Revision 4.4 1998/06/28 16:50:40 kardel
* (getflt): fixed ENDIAN issue
* (getdbl): fixed ENDIAN issue
* (getint): use get_msb_short()
* (cvt_trimtsip): use gpstolfp() for conversion
*
* Revision 4.3 1998/06/13 12:07:31 kardel
* fix SYSV clock name clash
*
* Revision 4.2 1998/06/12 15:22:30 kardel
* fix prototypes
*
* Revision 4.1 1998/05/24 09:39:54 kardel
* implementation of the new IO handling model
*
* Revision 4.0 1998/04/10 19:45:32 kardel
* Start 4.0 release version numbering
*
* from V3 1.8 loginfo deleted 1998/04/11 kardel
*/
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