1 /* $NetBSD: refclock_true.c,v 1.1.1.3 2013/12/27 23:31:00 christos Exp $ */ 2 3 /* 4 * refclock_true - clock driver for the Kinemetrics Truetime receivers 5 * Receiver Version 3.0C - tested plain, with CLKLDISC 6 * Developement work being done: 7 * - Properly handle varying satellite positions (more acurately) 8 * - Integrate GPSTM and/or OMEGA and/or TRAK and/or ??? drivers 9 */ 10 11 #ifdef HAVE_CONFIG_H 12 #include <config.h> 13 #endif 14 15 #if defined(REFCLOCK) && defined(CLOCK_TRUETIME) 16 17 #include <stdio.h> 18 #include <ctype.h> 19 20 #include "ntpd.h" 21 #include "ntp_io.h" 22 #include "ntp_refclock.h" 23 #include "ntp_unixtime.h" 24 #include "ntp_stdlib.h" 25 26 #ifdef SYS_WINNT 27 extern int async_write(int, const void *, unsigned int); 28 #undef write 29 #define write(fd, data, octets) async_write(fd, data, octets) 30 #endif 31 32 /* This should be an atom clock but those are very hard to build. 33 * 34 * The PCL720 from P C Labs has an Intel 8253 lookalike, as well as a bunch 35 * of TTL input and output pins, all brought out to the back panel. If you 36 * wire a PPS signal (such as the TTL PPS coming out of a GOES or other 37 * Kinemetrics/Truetime clock) to the 8253's GATE0, and then also wire the 38 * 8253's OUT0 to the PCL720's INPUT3.BIT0, then we can read CTR0 to get the 39 * number of uSecs since the last PPS upward swing, mediated by reading OUT0 40 * to find out if the counter has wrapped around (this happens if more than 41 * 65535us (65ms) elapses between the PPS event and our being called.) 42 */ 43 #ifdef CLOCK_PPS720 44 # undef min /* XXX */ 45 # undef max /* XXX */ 46 # include <machine/inline.h> 47 # include <sys/pcl720.h> 48 # include <sys/i8253.h> 49 # define PCL720_IOB 0x2a0 /* XXX */ 50 # define PCL720_CTR 0 /* XXX */ 51 #endif 52 53 /* 54 * Support for Kinemetrics Truetime Receivers 55 * GOES 56 * GPS/TM-TMD 57 * XL-DC (a 151-602-210, reported by the driver as a GPS/TM-TMD) 58 * GPS-800 TCU (an 805-957 with the RS232 Talker/Listener module) 59 * OM-DC: getting stale ("OMEGA") 60 * 61 * Most of this code is originally from refclock_wwvb.c with thanks. 62 * It has been so mangled that wwvb is not a recognizable ancestor. 63 * 64 * Timcode format: ADDD:HH:MM:SSQCL 65 * A - control A (this is stripped before we see it) 66 * Q - Quality indication (see below) 67 * C - Carriage return 68 * L - Line feed 69 * 70 * Quality codes indicate possible error of 71 * 468-DC GOES Receiver: 72 * GPS-TM/TMD Receiver: (default quality codes for XL-DC) 73 * ? +/- 1 milliseconds # +/- 100 microseconds 74 * * +/- 10 microseconds . +/- 1 microsecond 75 * space less than 1 microsecond 76 * OM-DC OMEGA Receiver: (default quality codes for OMEGA) 77 * WARNING OMEGA navigation system is no longer existent 78 * > >+- 5 seconds 79 * ? >+/- 500 milliseconds # >+/- 50 milliseconds 80 * * >+/- 5 milliseconds . >+/- 1 millisecond 81 * A-H less than 1 millisecond. Character indicates which station 82 * is being received as follows: 83 * A = Norway, B = Liberia, C = Hawaii, D = North Dakota, 84 * E = La Reunion, F = Argentina, G = Australia, H = Japan. 85 * 86 * The carriage return start bit begins on 0 seconds and extends to 1 bit time. 87 * 88 * Notes on 468-DC and OMEGA receiver: 89 * 90 * Send the clock a 'R' or 'C' and once per second a timestamp will 91 * appear. Send a 'P' to get the satellite position once (GOES only.) 92 * 93 * Notes on the 468-DC receiver: 94 * 95 * Since the old east/west satellite locations are only historical, you can't 96 * set your clock propagation delay settings correctly and still use 97 * automatic mode. The manual says to use a compromise when setting the 98 * switches. This results in significant errors. The solution; use fudge 99 * time1 and time2 to incorporate corrections. If your clock is set for 100 * 50 and it should be 58 for using the west and 46 for using the east, 101 * use the line 102 * 103 * fudge 127.127.5.0 time1 +0.008 time2 -0.004 104 * 105 * This corrects the 4 milliseconds advance and 8 milliseconds retard 106 * needed. The software will ask the clock which satellite it sees. 107 * 108 * Ntp.conf parameters: 109 * time1 - offset applied to samples when reading WEST satellite (default = 0) 110 * time2 - offset applied to samples when reading EAST satellite (default = 0) 111 * val1 - stratum to assign to this clock (default = 0) 112 * val2 - refid assigned to this clock (default = "TRUE", see below) 113 * flag1 - will silence the clock side of ntpd, just reading the clock 114 * without trying to write to it. (default = 0) 115 * flag2 - generate a debug file /tmp/true%d. 116 * flag3 - enable ppsclock streams module 117 * flag4 - use the PCL-720 (BSD/OS only) 118 */ 119 120 121 /* 122 * Definitions 123 */ 124 #define DEVICE "/dev/true%d" 125 #define SPEED232 B9600 /* 9600 baud */ 126 127 /* 128 * Radio interface parameters 129 */ 130 #define PRECISION (-10) /* precision assumed (about 1 ms) */ 131 #define REFID "TRUE" /* reference id */ 132 #define DESCRIPTION "Kinemetrics/TrueTime Receiver" 133 134 /* 135 * Tags which station (satellite) we see 136 */ 137 #define GOES_WEST 0 /* Default to WEST satellite and apply time1 */ 138 #define GOES_EAST 1 /* until you discover otherwise */ 139 140 /* 141 * used by the state machine 142 */ 143 enum true_event {e_Init, e_Huh, e_F18, e_F50, e_F51, e_Satellite, 144 e_Poll, e_Location, e_TS, e_Max}; 145 const char *events[] = {"Init", "Huh", "F18", "F50", "F51", "Satellite", 146 "Poll", "Location", "TS"}; 147 #define eventStr(x) (((int)x<(int)e_Max) ? events[(int)x] : "?") 148 149 enum true_state {s_Base, s_InqTM, s_InqTCU, s_InqOmega, s_InqGOES, 150 s_Init, s_F18, s_F50, s_Start, s_Auto, s_Max}; 151 const char *states[] = {"Base", "InqTM", "InqTCU", "InqOmega", "InqGOES", 152 "Init", "F18", "F50", "Start", "Auto"}; 153 #define stateStr(x) (((int)x<(int)s_Max) ? states[(int)x] : "?") 154 155 enum true_type {t_unknown, t_goes, t_tm, t_tcu, t_omega, t_Max}; 156 const char *types[] = {"unknown", "goes", "tm", "tcu", "omega"}; 157 #define typeStr(x) (((int)x<(int)t_Max) ? types[(int)x] : "?") 158 159 /* 160 * unit control structure 161 */ 162 struct true_unit { 163 unsigned int pollcnt; /* poll message counter */ 164 unsigned int station; /* which station we are on */ 165 unsigned int polled; /* Hand in a time sample? */ 166 enum true_state state; /* state machine */ 167 enum true_type type; /* what kind of clock is it? */ 168 int unit; /* save an extra copy of this */ 169 FILE *debug; /* debug logging file */ 170 #ifdef CLOCK_PPS720 171 int pcl720init; /* init flag for PCL 720 */ 172 #endif 173 }; 174 175 /* 176 * Function prototypes 177 */ 178 static int true_start (int, struct peer *); 179 static void true_shutdown (int, struct peer *); 180 static void true_receive (struct recvbuf *); 181 static void true_poll (int, struct peer *); 182 static void true_send (struct peer *, const char *); 183 static void true_doevent (struct peer *, enum true_event); 184 185 #ifdef CLOCK_PPS720 186 static u_long true_sample720 (void); 187 #endif 188 189 /* 190 * Transfer vector 191 */ 192 struct refclock refclock_true = { 193 true_start, /* start up driver */ 194 true_shutdown, /* shut down driver */ 195 true_poll, /* transmit poll message */ 196 noentry, /* not used (old true_control) */ 197 noentry, /* initialize driver (not used) */ 198 noentry, /* not used (old true_buginfo) */ 199 NOFLAGS /* not used */ 200 }; 201 202 203 #if !defined(__STDC__) 204 # define true_debug (void) 205 #else 206 static void 207 true_debug(struct peer *peer, const char *fmt, ...) 208 { 209 va_list ap; 210 int want_debugging, now_debugging; 211 struct refclockproc *pp; 212 struct true_unit *up; 213 214 va_start(ap, fmt); 215 pp = peer->procptr; 216 up = pp->unitptr; 217 218 want_debugging = (pp->sloppyclockflag & CLK_FLAG2) != 0; 219 now_debugging = (up->debug != NULL); 220 if (want_debugging != now_debugging) 221 { 222 if (want_debugging) { 223 char filename[40]; 224 int fd; 225 226 snprintf(filename, sizeof(filename), 227 "/tmp/true%d.debug", up->unit); 228 fd = open(filename, O_CREAT | O_WRONLY | O_EXCL, 229 0600); 230 if (fd >= 0 && (up->debug = fdopen(fd, "r+"))) { 231 #ifdef HAVE_SETVBUF 232 static char buf[BUFSIZ]; 233 234 setvbuf(up->debug, buf, _IOLBF, BUFSIZ); 235 #else 236 setlinebuf(up->debug); 237 #endif 238 } 239 } else { 240 fclose(up->debug); 241 up->debug = NULL; 242 } 243 } 244 245 if (up->debug) { 246 fprintf(up->debug, "true%d: ", up->unit); 247 vfprintf(up->debug, fmt, ap); 248 } 249 va_end(ap); 250 } 251 #endif /*STDC*/ 252 253 /* 254 * true_start - open the devices and initialize data for processing 255 */ 256 static int 257 true_start( 258 int unit, 259 struct peer *peer 260 ) 261 { 262 register struct true_unit *up; 263 struct refclockproc *pp; 264 char device[40]; 265 int fd; 266 267 /* 268 * Open serial port 269 */ 270 snprintf(device, sizeof(device), DEVICE, unit); 271 fd = refclock_open(device, SPEED232, LDISC_CLK); 272 if (fd <= 0) 273 return 0; 274 275 /* 276 * Allocate and initialize unit structure 277 */ 278 up = emalloc_zero(sizeof(*up)); 279 pp = peer->procptr; 280 pp->io.clock_recv = true_receive; 281 pp->io.srcclock = peer; 282 pp->io.datalen = 0; 283 pp->io.fd = fd; 284 if (!io_addclock(&pp->io)) { 285 close(fd); 286 pp->io.fd = -1; 287 free(up); 288 return (0); 289 } 290 pp->unitptr = up; 291 292 /* 293 * Initialize miscellaneous variables 294 */ 295 peer->precision = PRECISION; 296 pp->clockdesc = DESCRIPTION; 297 memcpy(&pp->refid, REFID, 4); 298 up->pollcnt = 2; 299 up->type = t_unknown; 300 up->state = s_Base; 301 302 /* 303 * Send a CTRL-C character at the start, 304 * just in case the clock is already 305 * sending timecodes 306 */ 307 true_send(peer, "\03\r"); 308 309 true_doevent(peer, e_Init); 310 311 return (1); 312 } 313 314 315 /* 316 * true_shutdown - shut down the clock 317 */ 318 static void 319 true_shutdown( 320 int unit, 321 struct peer *peer 322 ) 323 { 324 register struct true_unit *up; 325 struct refclockproc *pp; 326 327 pp = peer->procptr; 328 up = pp->unitptr; 329 if (pp->io.fd != -1) 330 io_closeclock(&pp->io); 331 if (up != NULL) 332 free(up); 333 } 334 335 336 /* 337 * true_receive - receive data from the serial interface on a clock 338 */ 339 static void 340 true_receive( 341 struct recvbuf *rbufp 342 ) 343 { 344 register struct true_unit *up; 345 struct refclockproc *pp; 346 struct peer *peer; 347 u_short new_station; 348 char synced; 349 int i; 350 int lat, lon, off; /* GOES Satellite position */ 351 /* These variables hold data until we decide to keep it */ 352 char rd_lastcode[BMAX]; 353 l_fp rd_tmp; 354 u_short rd_lencode; 355 356 /* 357 * Get the clock this applies to and pointers to the data. 358 */ 359 peer = rbufp->recv_peer; 360 pp = peer->procptr; 361 up = pp->unitptr; 362 363 /* 364 * Read clock output. Automatically handles STREAMS, CLKLDISC. 365 */ 366 rd_lencode = refclock_gtlin(rbufp, rd_lastcode, BMAX, &rd_tmp); 367 rd_lastcode[rd_lencode] = '\0'; 368 369 /* 370 * There is a case where <cr><lf> generates 2 timestamps. 371 */ 372 if (rd_lencode == 0) 373 return; 374 pp->lencode = rd_lencode; 375 strlcpy(pp->a_lastcode, rd_lastcode, sizeof(pp->a_lastcode)); 376 pp->lastrec = rd_tmp; 377 true_debug(peer, "receive(%s) [%d]\n", pp->a_lastcode, 378 pp->lencode); 379 380 up->pollcnt = 2; 381 record_clock_stats(&peer->srcadr, pp->a_lastcode); 382 383 /* 384 * We get down to business, check the timecode format and decode 385 * its contents. This code decodes a multitude of different 386 * clock messages. Timecodes are processed if needed. All replies 387 * will be run through the state machine to tweak driver options 388 * and program the clock. 389 */ 390 391 /* 392 * Clock misunderstood our last command? 393 */ 394 if (pp->a_lastcode[0] == '?' || 395 strcmp(pp->a_lastcode, "ERROR 05 NO SUCH FUNCTION") == 0) { 396 true_doevent(peer, e_Huh); 397 return; 398 } 399 400 /* 401 * Timecode: "nnnnn+nnn-nnn" 402 * (from GOES clock when asked about satellite position) 403 */ 404 if ((pp->a_lastcode[5] == '+' || pp->a_lastcode[5] == '-') && 405 (pp->a_lastcode[9] == '+' || pp->a_lastcode[9] == '-') && 406 sscanf(pp->a_lastcode, "%5d%*c%3d%*c%3d", &lon, &lat, &off) == 3 407 ) { 408 const char *label = "Botch!"; 409 410 /* 411 * This is less than perfect. Call the (satellite) 412 * either EAST or WEST and adjust slop accodingly 413 * Perfectionists would recalculate the exact delay 414 * and adjust accordingly... 415 */ 416 if (lon > 7000 && lon < 14000) { 417 if (lon < 10000) { 418 new_station = GOES_EAST; 419 label = "EAST"; 420 } else { 421 new_station = GOES_WEST; 422 label = "WEST"; 423 } 424 425 if (new_station != up->station) { 426 double dtemp; 427 428 dtemp = pp->fudgetime1; 429 pp->fudgetime1 = pp->fudgetime2; 430 pp->fudgetime2 = dtemp; 431 up->station = new_station; 432 } 433 } 434 else { 435 /*refclock_report(peer, CEVNT_BADREPLY);*/ 436 label = "UNKNOWN"; 437 } 438 true_debug(peer, "GOES: station %s\n", label); 439 true_doevent(peer, e_Satellite); 440 return; 441 } 442 443 /* 444 * Timecode: "Fnn" 445 * (from TM/TMD clock when it wants to tell us what it's up to.) 446 */ 447 if (sscanf(pp->a_lastcode, "F%2d", &i) == 1 && i > 0 && i < 80) { 448 switch (i) { 449 case 50: 450 true_doevent(peer, e_F50); 451 break; 452 case 51: 453 true_doevent(peer, e_F51); 454 break; 455 default: 456 true_debug(peer, "got F%02d - ignoring\n", i); 457 break; 458 } 459 return; 460 } 461 462 /* 463 * Timecode: " TRUETIME Mk III" or " TRUETIME XL" 464 * (from a TM/TMD/XL clock during initialization.) 465 */ 466 if (strcmp(pp->a_lastcode, " TRUETIME Mk III") == 0 || 467 strncmp(pp->a_lastcode, " TRUETIME XL", 12) == 0) { 468 true_doevent(peer, e_F18); 469 NLOG(NLOG_CLOCKSTATUS) { 470 msyslog(LOG_INFO, "TM/TMD/XL: %s", pp->a_lastcode); 471 } 472 return; 473 } 474 475 /* 476 * Timecode: "N03726428W12209421+000033" 477 * 1 2 478 * index 0123456789012345678901234 479 * (from a TCU during initialization) 480 */ 481 if ((pp->a_lastcode[0] == 'N' || pp->a_lastcode[0] == 'S') && 482 (pp->a_lastcode[9] == 'W' || pp->a_lastcode[9] == 'E') && 483 pp->a_lastcode[18] == '+') { 484 true_doevent(peer, e_Location); 485 NLOG(NLOG_CLOCKSTATUS) { 486 msyslog(LOG_INFO, "TCU-800: %s", pp->a_lastcode); 487 } 488 return; 489 } 490 /* 491 * Timecode: "ddd:hh:mm:ssQ" 492 * 1 2 493 * index 0123456789012345678901234 494 * (from all clocks supported by this driver.) 495 */ 496 if (pp->a_lastcode[3] == ':' && 497 pp->a_lastcode[6] == ':' && 498 pp->a_lastcode[9] == ':' && 499 sscanf(pp->a_lastcode, "%3d:%2d:%2d:%2d%c", 500 &pp->day, &pp->hour, &pp->minute, 501 &pp->second, &synced) == 5) { 502 503 /* 504 * Adjust the synchronize indicator according to timecode 505 * say were OK, and then say not if we really are not OK 506 */ 507 if (synced == '>' || synced == '#' || synced == '?' 508 || synced == 'X') 509 pp->leap = LEAP_NOTINSYNC; 510 else 511 pp->leap = LEAP_NOWARNING; 512 513 true_doevent(peer, e_TS); 514 515 #ifdef CLOCK_PPS720 516 /* If it's taken more than 65ms to get here, we'll lose. */ 517 if ((pp->sloppyclockflag & CLK_FLAG4) && up->pcl720init) { 518 l_fp off; 519 520 #ifdef CLOCK_ATOM 521 /* 522 * find out what time it really is. Include 523 * the count from the PCL720 524 */ 525 if (!clocktime(pp->day, pp->hour, pp->minute, 526 pp->second, GMT, pp->lastrec.l_ui, 527 &pp->yearstart, &off.l_ui)) { 528 refclock_report(peer, CEVNT_BADTIME); 529 return; 530 } 531 off.l_uf = 0; 532 #endif 533 534 pp->usec = true_sample720(); 535 #ifdef CLOCK_ATOM 536 TVUTOTSF(pp->usec, off.l_uf); 537 #endif 538 539 /* 540 * Stomp all over the timestamp that was pulled out 541 * of the input stream. It's irrelevant since we've 542 * adjusted the input time to reflect now (via pp->usec) 543 * rather than when the data was collected. 544 */ 545 get_systime(&pp->lastrec); 546 #ifdef CLOCK_ATOM 547 /* 548 * Create a true offset for feeding to pps_sample() 549 */ 550 L_SUB(&off, &pp->lastrec); 551 552 pps_sample(peer, &off); 553 #endif 554 true_debug(peer, "true_sample720: %luus\n", pp->usec); 555 } 556 #endif 557 558 /* 559 * The clock will blurt a timecode every second but we only 560 * want one when polled. If we havn't been polled, bail out. 561 */ 562 if (!up->polled) 563 return; 564 565 true_doevent(peer, e_Poll); 566 if (!refclock_process(pp)) { 567 refclock_report(peer, CEVNT_BADTIME); 568 return; 569 } 570 /* 571 * If clock is good we send a NOMINAL message so that 572 * any previous BAD messages are nullified 573 */ 574 pp->lastref = pp->lastrec; 575 refclock_receive(peer); 576 refclock_report(peer, CEVNT_NOMINAL); 577 578 /* 579 * We have succedded in answering the poll. 580 * Turn off the flag and return 581 */ 582 up->polled = 0; 583 584 return; 585 } 586 587 /* 588 * No match to known timecodes, report failure and return 589 */ 590 refclock_report(peer, CEVNT_BADREPLY); 591 return; 592 } 593 594 595 /* 596 * true_send - time to send the clock a signal to cough up a time sample 597 */ 598 static void 599 true_send( 600 struct peer *peer, 601 const char *cmd 602 ) 603 { 604 struct refclockproc *pp; 605 606 pp = peer->procptr; 607 if (!(pp->sloppyclockflag & CLK_FLAG1)) { 608 int len = strlen(cmd); 609 610 true_debug(peer, "Send '%s'\n", cmd); 611 if (write(pp->io.fd, cmd, (unsigned)len) != len) 612 refclock_report(peer, CEVNT_FAULT); 613 else 614 pp->polls++; 615 } 616 } 617 618 619 /* 620 * state machine for initializing and controlling a clock 621 */ 622 static void 623 true_doevent( 624 struct peer *peer, 625 enum true_event event 626 ) 627 { 628 struct true_unit *up; 629 struct refclockproc *pp; 630 631 pp = peer->procptr; 632 up = pp->unitptr; 633 if (event != e_TS) { 634 NLOG(NLOG_CLOCKSTATUS) { 635 msyslog(LOG_INFO, "TRUE: clock %s, state %s, event %s", 636 typeStr(up->type), 637 stateStr(up->state), 638 eventStr(event)); 639 } 640 } 641 true_debug(peer, "clock %s, state %s, event %s\n", 642 typeStr(up->type), stateStr(up->state), eventStr(event)); 643 switch (up->type) { 644 case t_goes: 645 switch (event) { 646 case e_Init: /* FALLTHROUGH */ 647 case e_Satellite: 648 /* 649 * Switch back to on-second time codes and return. 650 */ 651 true_send(peer, "C"); 652 up->state = s_Start; 653 break; 654 case e_Poll: 655 /* 656 * After each poll, check the station (satellite). 657 */ 658 true_send(peer, "P"); 659 /* No state change needed. */ 660 break; 661 default: 662 break; 663 } 664 /* FALLTHROUGH */ 665 case t_omega: 666 switch (event) { 667 case e_Init: 668 true_send(peer, "C"); 669 up->state = s_Start; 670 break; 671 case e_TS: 672 if (up->state != s_Start && up->state != s_Auto) { 673 true_send(peer, "\03\r"); 674 break; 675 } 676 up->state = s_Auto; 677 break; 678 default: 679 break; 680 } 681 break; 682 case t_tm: 683 switch (event) { 684 case e_Init: 685 true_send(peer, "F18\r"); 686 up->state = s_Init; 687 break; 688 case e_F18: 689 true_send(peer, "F50\r"); 690 up->state = s_F18; 691 break; 692 case e_F50: 693 true_send(peer, "F51\r"); 694 up->state = s_F50; 695 break; 696 case e_F51: 697 true_send(peer, "F08\r"); 698 up->state = s_Start; 699 break; 700 case e_TS: 701 if (up->state != s_Start && up->state != s_Auto) { 702 true_send(peer, "\03\r"); 703 break; 704 } 705 up->state = s_Auto; 706 break; 707 default: 708 break; 709 } 710 break; 711 case t_tcu: 712 switch (event) { 713 case e_Init: 714 true_send(peer, "MD3\r"); /* GPS Synch'd Gen. */ 715 true_send(peer, "TSU\r"); /* UTC, not GPS. */ 716 true_send(peer, "AU\r"); /* Auto Timestamps. */ 717 up->state = s_Start; 718 break; 719 case e_TS: 720 if (up->state != s_Start && up->state != s_Auto) { 721 true_send(peer, "\03\r"); 722 break; 723 } 724 up->state = s_Auto; 725 break; 726 default: 727 break; 728 } 729 break; 730 case t_unknown: 731 switch (up->state) { 732 case s_Base: 733 if (event != e_Init) 734 abort(); 735 true_send(peer, "P\r"); 736 up->state = s_InqGOES; 737 break; 738 case s_InqGOES: 739 switch (event) { 740 case e_Satellite: 741 up->type = t_goes; 742 true_doevent(peer, e_Init); 743 break; 744 case e_Init: /*FALLTHROUGH*/ 745 case e_Huh: /*FALLTHROUGH*/ 746 case e_TS: 747 up->state = s_InqOmega; 748 true_send(peer, "C\r"); 749 break; 750 default: 751 abort(); 752 } 753 break; 754 case s_InqOmega: 755 switch (event) { 756 case e_TS: 757 up->type = t_omega; 758 up->state = s_Auto; /* Inq side-effect. */ 759 break; 760 case e_Init: /*FALLTHROUGH*/ 761 case e_Huh: 762 up->state = s_InqTM; 763 true_send(peer, "F18\r"); 764 break; 765 default: 766 abort(); 767 } 768 break; 769 case s_InqTM: 770 switch (event) { 771 case e_F18: 772 up->type = t_tm; 773 true_doevent(peer, e_Init); 774 break; 775 case e_Init: /*FALLTHROUGH*/ 776 case e_Huh: 777 true_send(peer, "PO\r"); 778 up->state = s_InqTCU; 779 break; 780 default: 781 abort(); 782 } 783 break; 784 case s_InqTCU: 785 switch (event) { 786 case e_Location: 787 up->type = t_tcu; 788 true_doevent(peer, e_Init); 789 break; 790 case e_Init: /*FALLTHROUGH*/ 791 case e_Huh: 792 up->state = s_Base; 793 sleep(1); /* XXX */ 794 break; 795 default: 796 abort(); 797 } 798 break; 799 /* 800 * An expedient hack to prevent lint complaints, 801 * these don't actually need to be used here... 802 */ 803 case s_Init: 804 case s_F18: 805 case s_F50: 806 case s_Start: 807 case s_Auto: 808 case s_Max: 809 msyslog(LOG_INFO, "TRUE: state %s is unexpected!", 810 stateStr(up->state)); 811 } 812 break; 813 default: 814 abort(); 815 /* NOTREACHED */ 816 } 817 818 #ifdef CLOCK_PPS720 819 if ((pp->sloppyclockflag & CLK_FLAG4) && !up->pcl720init) { 820 /* Make counter trigger on gate0, count down from 65535. */ 821 pcl720_load(PCL720_IOB, PCL720_CTR, i8253_oneshot, 65535); 822 /* 823 * (These constants are OK since 824 * they represent hardware maximums.) 825 */ 826 NLOG(NLOG_CLOCKINFO) { 827 msyslog(LOG_NOTICE, "PCL-720 initialized"); 828 } 829 up->pcl720init++; 830 } 831 #endif 832 833 834 } 835 836 /* 837 * true_poll - called by the transmit procedure 838 */ 839 static void 840 true_poll( 841 int unit, 842 struct peer *peer 843 ) 844 { 845 struct true_unit *up; 846 struct refclockproc *pp; 847 848 /* 849 * You don't need to poll this clock. It puts out timecodes 850 * once per second. If asked for a timestamp, take note. 851 * The next time a timecode comes in, it will be fed back. 852 */ 853 pp = peer->procptr; 854 up = pp->unitptr; 855 if (up->pollcnt > 0) { 856 up->pollcnt--; 857 } else { 858 true_doevent(peer, e_Init); 859 refclock_report(peer, CEVNT_TIMEOUT); 860 } 861 862 /* 863 * polled every 64 seconds. Ask true_receive to hand in a 864 * timestamp. 865 */ 866 up->polled = 1; 867 pp->polls++; 868 } 869 870 #ifdef CLOCK_PPS720 871 /* 872 * true_sample720 - sample the PCL-720 873 */ 874 static u_long 875 true_sample720(void) 876 { 877 unsigned long f; 878 879 /* We wire the PCL-720's 8253.OUT0 to bit 0 of connector 3. 880 * If it is not being held low now, we did not get called 881 * within 65535us. 882 */ 883 if (inb(pcl720_data_16_23(PCL720_IOB)) & 0x01) { 884 NLOG(NLOG_CLOCKINFO) { 885 msyslog(LOG_NOTICE, "PCL-720 out of synch"); 886 } 887 return (0); 888 } 889 f = (65536 - pcl720_read(PCL720_IOB, PCL720_CTR)); 890 #ifdef PPS720_DEBUG 891 msyslog(LOG_DEBUG, "PCL-720: %luus", f); 892 #endif 893 return (f); 894 } 895 #endif 896 897 #else 898 int refclock_true_bs; 899 #endif /* REFCLOCK */ 900