1 #ifdef HAVE_CONFIG_H 2 # include <config.h> 3 #endif 4 5 #if defined(REFCLOCK) && defined(CLOCK_PARSE) && defined(CLOCK_VARITEXT) 6 /* 7 * clk_varitext.c,v 1.0 1997/01/19 A.McConnell 8 * 9 * Supports Varitext's Radio Clock 10 * 11 * Used the Meinberg/Computime clock as a template for Varitext Radio Clock 12 * 13 * Copyright (C) 1992-1996 by Frank Kardel 14 * Friedrich-Alexander Universitt Erlangen-Nrnberg, Germany 15 * 16 * This program is distributed in the hope that it will be useful, but WITHOUT 17 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 18 * FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 */ 21 22 #include "ntp_fp.h" 23 #include "ntp_unixtime.h" 24 #include "ntp_calendar.h" 25 26 #include "parse.h" 27 28 #ifndef PARSESTREAM 29 # include "ntp_stdlib.h" 30 # include <stdio.h> 31 #else 32 # include "sys/parsestreams.h" 33 extern void printf P((const char *, ...)); 34 #endif 35 36 static const u_char VT_INITIALISED = 0x01; 37 static const u_char VT_SYNCHRONISED = 0x02; 38 static const u_char VT_ALARM_STATE = 0x04; 39 static const u_char VT_BST = 0x08; 40 static const u_char VT_SEASON_CHANGE = 0x10; 41 static const u_char VT_LAST_TELEGRAM_OK = 0x20; 42 43 /* 44 * The Varitext receiver sends a datagram in the following format every minute 45 * 46 * Timestamp T:YY:MM:MD:WD:HH:MM:SSCRLFSTXXX 47 * Pos 0123456789012345678901 2 3 4567 48 * 0000000000111111111122 2 2 2222 49 * Parse T: : : : : : : \r\n 50 * 51 * T Startcharacter "T" specifies start of the timestamp 52 * YY Year MM Month 1-12 53 * MD Day of the month 54 * WD Day of week 55 * HH Hour 56 * MM Minute 57 * SS Second 58 * CR Carriage return 59 * LF Linefeed 60 * ST Status character 61 * Bit 0 - Set= Initialised; Reset=Time Invalid (DO NOT USE) 62 * Bit 1 - Set= Synchronised; Reset= Unsynchronised 63 * Bit 2 - Set= Alarm state; Reset= No alarm 64 * Bit 3 - Set= BST; Reset= GMT 65 * Bit 4 - Set= Seasonal change in approx hour; Reset= No seasonal change expected 66 * Bit 5 - Set= Last MSF telegram was OK; Reset= Last telegram was in error; 67 * Bit 6 - Always set 68 * Bit 7 - Unused 69 * XXX Checksum calculated using Fletcher's method (ignored for now). 70 */ 71 72 static struct format varitext_fmt = 73 { 74 { 75 {8, 2}, {5, 2}, {2, 2}, /* day, month, year */ 76 {14, 2}, {17, 2}, {20, 2}, /* hour, minute, second */ 77 {11, 2}, {24, 1} /* dayofweek, status */ 78 }, 79 (const unsigned char*)"T: : : : : : : \r\n ", 80 0 81 }; 82 83 static u_long cvt_varitext P((unsigned char *, int, struct format *, clocktime_t *, void *)); 84 static u_long inp_varitext P((parse_t *, unsigned int, timestamp_t *)); 85 86 struct varitext { 87 unsigned char start_found; 88 unsigned char end_found; 89 unsigned char end_count; 90 unsigned char previous_ch; 91 timestamp_t tstamp; 92 }; 93 94 clockformat_t clock_varitext = 95 { 96 inp_varitext, /* Because of the strange format we need to parse it ourselves */ 97 cvt_varitext, /* Varitext conversion */ 98 0, /* no PPS monitoring */ 99 (void *)&varitext_fmt, /* conversion configuration */ 100 "Varitext Radio Clock", /* Varitext Radio Clock */ 101 30, /* string buffer */ 102 sizeof(struct varitext), /* Private data size required to hold current parse state */ 103 }; 104 105 /* 106 * cvt_varitext 107 * 108 * convert simple type format 109 */ 110 static u_long 111 cvt_varitext( 112 unsigned char *buffer, 113 int size, 114 struct format *format, 115 clocktime_t *clock_time, 116 void *local 117 ) 118 { 119 120 if (!Strok(buffer, format->fixed_string)) { 121 return CVT_NONE; 122 } else { 123 if (Stoi(&buffer[format->field_offsets[O_DAY].offset], &clock_time->day, 124 format->field_offsets[O_DAY].length) || 125 Stoi(&buffer[format->field_offsets[O_MONTH].offset], &clock_time->month, 126 format->field_offsets[O_MONTH].length) || 127 Stoi(&buffer[format->field_offsets[O_YEAR].offset], &clock_time->year, 128 format->field_offsets[O_YEAR].length) || 129 Stoi(&buffer[format->field_offsets[O_HOUR].offset], &clock_time->hour, 130 format->field_offsets[O_HOUR].length) || 131 Stoi(&buffer[format->field_offsets[O_MIN].offset], &clock_time->minute, 132 format->field_offsets[O_MIN].length) || 133 Stoi(&buffer[format->field_offsets[O_SEC].offset], &clock_time->second, 134 format->field_offsets[O_SEC].length)) { 135 return CVT_FAIL | CVT_BADFMT; 136 } else { 137 u_char *f = (u_char*) &buffer[format->field_offsets[O_FLAGS].offset]; 138 139 clock_time->flags = 0; 140 clock_time->utcoffset = 0; 141 142 if (((*f) & VT_BST)) /* BST flag is set so set to indicate daylight saving time is active and utc offset */ 143 { 144 clock_time->utcoffset = -1*60*60; 145 clock_time->flags |= PARSEB_DST; 146 } 147 /* 148 if (!((*f) & VT_INITIALISED)) Clock not initialised 149 clock_time->flags |= PARSEB_POWERUP; 150 151 if (!((*f) & VT_SYNCHRONISED)) Clock not synchronised 152 clock_time->flags |= PARSEB_NOSYNC; 153 154 if (((*f) & VT_SEASON_CHANGE)) Seasonal change expected in the next hour 155 clock_time->flags |= PARSEB_ANNOUNCE; 156 */ 157 return CVT_OK; 158 } 159 } 160 } 161 162 static u_long 163 inp_varitext( 164 parse_t *parseio, 165 unsigned int ch, 166 timestamp_t *tstamp 167 ) 168 { 169 struct varitext *t = (struct varitext *)parseio->parse_pdata; 170 int rtc; 171 172 parseprintf(DD_PARSE, ("inp_varitext(0x%lx, 0x%x, ...)\n", (long)parseio, ch)); 173 174 if (!t) 175 return PARSE_INP_SKIP; /* local data not allocated - sigh! */ 176 177 if (ch == 'T') 178 t->tstamp = *tstamp; 179 180 if ((t->previous_ch == 'T') && (ch == ':')) 181 { 182 parseprintf(DD_PARSE, ("inp_varitext: START seen\n")); 183 184 parseio->parse_data[0] = 'T'; 185 parseio->parse_index=1; 186 parseio->parse_dtime.parse_stime = t->tstamp; /* Time stamp at packet start */ 187 t->start_found = 1; 188 t->end_found = 0; 189 t->end_count = 0; 190 } 191 192 if (t->start_found) 193 { 194 if ((rtc = parse_addchar(parseio, ch)) != PARSE_INP_SKIP) 195 { 196 parseprintf(DD_PARSE, ("inp_varitext: ABORTED due to too many characters\n")); 197 198 memset(t, 0, sizeof(struct varitext)); 199 return rtc; 200 } 201 202 if (t->end_found) 203 { 204 if (++(t->end_count) == 4) /* Finally found the end of the message */ 205 { 206 parseprintf(DD_PARSE, ("inp_varitext: END seen\n")); 207 208 memset(t, 0, sizeof(struct varitext)); 209 if ((rtc = parse_addchar(parseio, 0)) == PARSE_INP_SKIP) 210 return parse_end(parseio); 211 else 212 return rtc; 213 } 214 } 215 216 if ((t->previous_ch == '\r') && (ch == '\n')) 217 { 218 t->end_found = 1; 219 } 220 221 } 222 223 t->previous_ch = ch; 224 225 return PARSE_INP_SKIP; 226 } 227 228 #else /* not (REFCLOCK && CLOCK_PARSE && CLOCK_VARITEXT) */ 229 int clk_varitext_bs; 230 #endif /* not (REFCLOCK && CLOCK_PARSE && CLOCK_VARITEXT) */ 231 232 /* 233 * Revision 1.0 1997/06/02 13:16:30 McConnell 234 * File created 235 * 236 */ 237