clk_wharton.c revision 54359 
1/*
2 * /src/NTP/ntp-4/libparse/clk_wharton.c,v 4.1 1999/02/28 15:27:24 kardel RELEASE_19990228_A
3 *
4 * clk_wharton.c,v 4.1 1999/02/28 15:27:24 kardel RELEASE_19990228_A
5 *
6 * From Philippe De Muyter <phdm@macqel.be>, 1999
7 */
8#ifdef HAVE_CONFIG_H
9#include <config.h>
10#endif
11
12#if defined(REFCLOCK) && defined(CLOCK_PARSE) && defined(CLOCK_WHARTON_400A)
13/*
14 * Support for WHARTON 400A Series clock + 404.2 serial interface.
15 *
16 * Copyright (C) 1999 by Philippe De Muyter <phdm@macqel.be>
17 *
18 * This program is distributed in the hope that it will be useful, but WITHOUT
19 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
20 * FITNESS FOR A PARTICULAR PURPOSE.
21 *
22 */
23
24#include "ntp_fp.h"
25#include "ascii.h"
26#include "parse.h"
27
28#ifndef PARSESTREAM
29#include "ntp_stdlib.h"
30#include <stdio.h>
31#else
32#include "sys/parsestreams.h"
33extern void printf P((const char *, ...));
34#endif
35
36/*
37 * In private e-mail alastair@wharton.co.uk said :
38 * "If you are going to use the 400A and 404.2 system [for ntp] I recommend
39 * that you set the 400A to output the message every second.  The start of
40 * transmission of the first byte of the message is synchronised to the
41 * second edge."
42 * The WHARTON 400A Series is able to send date/time serial messages
43 * in 7 output formats.  We use format 1 here because it is the shortest.
44 * For use with this driver, the WHARTON 400A Series clock must be set-up
45 * as follows :
46 *					Programmable	Selected
47 *					Option No	Option
48 *	BST or CET display		3		9 or 11
49 *	No external controller		7		0
50 *	Serial Output Format 1		9		1
51 *	Baud rate 9600 bps		10		96
52 *	Bit length 8 bits		11		8
53 *	Parity even			12		E
54 *
55 * WHARTON 400A Series output format 1 is as follows :
56 *
57 * Timestamp	STXssmmhhDDMMYYSETX
58 * Pos		0  12345678901234
59 *		0  00000000011111
60 *
61 *	STX	start transmission (ASCII 0x02)
62 *	ETX	end transmission (ASCII 0x03)
63 *	ss	Second expressed in reversed decimal (units then tens)
64 *	mm	Minute expressed in reversed decimal
65 *	hh	Hour expressed in reversed decimal
66 *	DD	Day of month expressed in reversed decimal
67 *	MM	Month expressed in reversed decimal (January is 1)
68 *	YY	Year (without century) expressed in reversed decimal
69 *	S	Status byte : 0x30 +
70 *			bit 0	0 = MSF source		1 = DCF source
71 *			bit 1	0 = Winter time		1 = Summer time
72 *			bit 2	0 = not synchronised	1 = synchronised
73 *			bit 3	0 = no early warning	1 = early warning
74 *
75 */
76
77/*
78 * cvt_wharton_400a
79 *
80 * convert simple type format
81 */
82static          u_long
83cvt_wharton_400a(
84	unsigned char *buffer,
85	int            size,
86	struct format *format,
87	clocktime_t   *clock_time,
88	void          *local
89	)
90{
91	int	i;
92
93	/* The given `size' includes a terminating null-character. */
94	if (size != 16 || buffer[0] != STX || buffer[14] != ETX)
95		return CVT_NONE;
96	for (i = 1; i < 14; i += 1)
97		if (buffer[i] < '0' || buffer[i] > '9')
98			return CVT_NONE;
99	clock_time->second = (buffer[2] - '0') * 10 + buffer[1] - '0';
100	clock_time->minute = (buffer[4] - '0') * 10 + buffer[3] - '0';
101	clock_time->hour   = (buffer[6] - '0') * 10 + buffer[5] - '0';
102	clock_time->day    = (buffer[8] - '0') * 10 + buffer[7] - '0';
103	clock_time->month  = (buffer[10] - '0') * 10 + buffer[9] - '0';
104	clock_time->year   = (buffer[12] - '0') * 10 + buffer[11] - '0';
105	clock_time->usecond = 0;
106	if (buffer[13] & 0x1) /* We have CET time */
107		clock_time->utcoffset = -1*60*60;
108	else		/* We have BST time */
109		clock_time->utcoffset = 0;
110	if (buffer[13] & 0x2) {
111		clock_time->flags |= PARSEB_DST;
112		clock_time->utcoffset += -1*60*60;
113	}
114	if (!(buffer[13] & 0x4))
115		clock_time->flags |= PARSEB_NOSYNC;
116	if (buffer[13] & 0x8)
117		clock_time->flags |= PARSEB_ANNOUNCE;
118
119	return CVT_OK;
120}
121
122/*
123 * inp_wharton_400a
124 *
125 * grep data from input stream
126 */
127static u_long
128inp_wharton_400a(
129	      parse_t      *parseio,
130	      unsigned int  ch,
131	      timestamp_t  *tstamp
132	      )
133{
134	unsigned int rtc;
135
136	parseprintf(DD_PARSE, ("inp_wharton_400a(0x%x, 0x%x, ...)\n", (int)parseio, (int)ch));
137
138	switch (ch)
139	{
140	case STX:
141		parseprintf(DD_PARSE, ("inp_wharton_400a: STX seen\n"));
142
143		parseio->parse_index = 1;
144		parseio->parse_data[0] = ch;
145		parseio->parse_dtime.parse_stime = *tstamp; /* collect timestamp */
146		return PARSE_INP_SKIP;
147
148	case ETX:
149		parseprintf(DD_PARSE, ("inp_wharton_400a: ETX seen\n"));
150		if ((rtc = parse_addchar(parseio, ch)) == PARSE_INP_SKIP)
151			return parse_end(parseio);
152		else
153			return rtc;
154
155	default:
156		return parse_addchar(parseio, ch);
157	}
158}
159
160clockformat_t   clock_wharton_400a =
161{
162	inp_wharton_400a,	/* input handling function */
163	cvt_wharton_400a,	/* conversion function */
164	0,			/* no PPS monitoring */
165	0,			/* conversion configuration */
166	"WHARTON 400A Series clock Output Format 1",	/* String format name */
167	15,			/* string buffer */
168	0			/* no private data (complete pakets) */
169};
170
171#else /* not (REFCLOCK && CLOCK_PARSE && CLOCK_WHARTON_400A) */
172int clk_wharton_400a_bs;
173#endif /* not (REFCLOCK && CLOCK_PARSE && CLOCK_WHARTON_400A) */
174
175/*
176 * clk_wharton.c,v
177 * Revision 4.1  1999/02/28 15:27:24  kardel
178 * wharton clock integration
179 *
180 */
181