1627 lines
38 KiB
C
1627 lines
38 KiB
C
/*
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* /src/NTP/REPOSITORY/v3/parse/util/dcfd.c,v 3.18 1994/05/12 12:49:23 kardel Exp
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*
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* dcfd.c,v 3.18 1994/05/12 12:49:23 kardel Exp
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*
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* Ported to FreeBSD 2.0 1995/03/20 by Vincenzo Capuano
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*
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* DCF77 100/200ms pulse synchronisation daemon program (via 50Baud serial line)
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*
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* Features:
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* DCF77 decoding
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* NTP loopfilter logic for local clock
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* interactive display for debugging
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*
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* Lacks:
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* Leap second handling (at that level you should switch to xntp3 - really!)
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*
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* Copyright (c) 1993,1994
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* Frank Kardel, Friedrich-Alexander Universitaet Erlangen-Nuernberg
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*
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* This program may not be sold or used for profit without prior
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* written consent of the author.
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*/
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#include <unistd.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/signal.h>
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#include <sys/errno.h>
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#include <syslog.h>
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/*
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* NTP compilation environment
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*/
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#ifdef USE_PROTOTYPES
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#include "ntp_stdlib.h"
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#include <signal.h>
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#include <stdio.h>
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#endif
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#ifdef SYS_LINUX
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#include "ntp_timex.h"
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#endif
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/*
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* select which terminal handling to use (currently only SysV variants)
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*/
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#if defined(HAVE_TERMIOS) || defined(STREAM)
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#include <termios.h>
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#define TTY_GETATTR(_FD_, _ARG_) tcgetattr((_FD_), (_ARG_))
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#define TTY_SETATTR(_FD_, _ARG_) tcsetattr((_FD_), TCSANOW, (_ARG_))
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#endif
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#if defined(HAVE_TERMIO) || defined(HAVE_SYSV_TTYS)
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#include <termio.h>
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#define TTY_GETATTR(_FD_, _ARG_) ioctl((_FD_), TCGETA, (_ARG_))
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#define TTY_SETATTR(_FD_, _ARG_) ioctl((_FD_), TCSETAW, (_ARG_))
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#endif
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#ifndef TTY_GETATTR
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MUST DEFINE ONE OF "HAVE_TERMIOS" or "HAVE_TERMIO"
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#endif
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#ifndef dysize
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#define dysize(_x_) (((_x_) % 4) ? 365 : (((_x_) % 400) ? 365 : 366))
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#endif
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#define timernormalize(_a_) \
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if ((_a_)->tv_usec >= 1000000) \
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{ \
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(_a_)->tv_sec += (_a_)->tv_usec / 1000000; \
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(_a_)->tv_usec = (_a_)->tv_usec % 1000000; \
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} \
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if ((_a_)->tv_usec < 0) \
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{ \
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(_a_)->tv_sec -= 1 + -(_a_)->tv_usec / 1000000; \
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(_a_)->tv_usec = 1000000 - (-(_a_)->tv_usec % 1000000); \
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}
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#define timeradd(_a_, _b_) \
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(_a_)->tv_sec += (_b_)->tv_sec; \
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(_a_)->tv_usec += (_b_)->tv_usec; \
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timernormalize((_a_))
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#define timersub(_a_, _b_) \
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(_a_)->tv_sec -= (_b_)->tv_sec; \
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(_a_)->tv_usec -= (_b_)->tv_usec; \
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timernormalize((_a_))
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/*
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* debug macros
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*/
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#define PRINTF if (interactive) printf
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#define LPRINTF if (interactive && loop_filter_debug) printf
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#ifdef DEBUG
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#define dprintf(_x_) PRINTF _x_
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#else
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#define dprintf(_x_)
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#endif
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extern int errno;
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/*
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* display received data (avoids also detaching from tty)
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*/
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static int interactive = 0;
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/*
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* display loopfilter (clock control) variables
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*/
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static int loop_filter_debug = 0;
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/*
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* do not set/adjust system time
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*/
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static int no_set = 0;
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/*
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* time that passes between start of DCF impulse and time stamping (fine
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* adjustment) in microseconds (receiver/OS dependent)
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*/
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#define DEFAULT_DELAY 230000 /* rough estimate */
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/*
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* The two states we can be in - eithe we receive nothing
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* usable or we have the correct time
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*/
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#define NO_SYNC 0x01
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#define SYNC 0x02
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static int sync_state = NO_SYNC;
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static time_t last_sync;
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static unsigned long ticks = 0;
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static char pat[] = "-\\|/";
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#define LINES (24-2) /* error lines after which the two headlines are repeated */
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#define MAX_UNSYNC (10*60) /* allow synchronisation loss for 10 minutes */
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#define NOTICE_INTERVAL (20*60) /* mention missing synchronisation every 20 minutes */
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/*
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* clock adjustment PLL - see NTP protocol spec (RFC1305) for details
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*/
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#define USECSCALE 10
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#define TIMECONSTANT 2
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#define ADJINTERVAL 0
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#define FREQ_WEIGHT 18
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#define PHASE_WEIGHT 7
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#define MAX_DRIFT 0x3FFFFFFF
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#define R_SHIFT(_X_, _Y_) (((_X_) < 0) ? -(-(_X_) >> (_Y_)) : ((_X_) >> (_Y_)))
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static struct timeval max_adj_offset = { 0, 128000 };
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static long clock_adjust = 0; /* current adjustment value (usec * 2^USECSCALE) */
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static long drift_comp = 0; /* accumulated drift value (usec / ADJINTERVAL) */
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static long adjustments = 0;
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static char skip_adjust = 1; /* discard first adjustment (bad samples) */
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/*
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* DCF77 state flags
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*/
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#define DCFB_ANNOUNCE 0x0001 /* switch time zone warning (DST switch) */
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#define DCFB_DST 0x0002 /* DST in effect */
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#define DCFB_LEAP 0x0004 /* LEAP warning (1 hour prior to occurence) */
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#define DCFB_ALTERNATE 0x0008 /* alternate antenna used */
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struct clocktime /* clock time broken up from time code */
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{
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long wday; /* Day of week: 1: Monday - 7: Sunday */
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long day;
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long month;
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long year;
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long hour;
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long minute;
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long second;
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long usecond;
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long utcoffset; /* in minutes */
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long flags; /* current clock status (DCF77 state flags) */
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};
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typedef struct clocktime clocktime_t;
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/*
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* (usually) quick constant multiplications
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*/
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#define TIMES10(_X_) (((_X_) << 3) + ((_X_) << 1)) /* *8 + *2 */
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#define TIMES24(_X_) (((_X_) << 4) + ((_X_) << 3)) /* *16 + *8 */
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#define TIMES60(_X_) ((((_X_) << 4) - (_X_)) << 2) /* *(16 - 1) *4 */
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/*
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* generic abs() function
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*/
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#define abs(_x_) (((_x_) < 0) ? -(_x_) : (_x_))
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/*
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* conversion related return/error codes
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*/
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#define CVT_MASK 0x0000000F /* conversion exit code */
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#define CVT_NONE 0x00000001 /* format not applicable */
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#define CVT_FAIL 0x00000002 /* conversion failed - error code returned */
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#define CVT_OK 0x00000004 /* conversion succeeded */
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#define CVT_BADFMT 0x00000010 /* general format error - (unparsable) */
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#define CVT_BADDATE 0x00000020 /* invalid date */
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#define CVT_BADTIME 0x00000040 /* invalid time */
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/*
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* DCF77 raw time code
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*
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* From "Zur Zeit", Physikalisch-Technische Bundesanstalt (PTB), Braunschweig
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* und Berlin, Maerz 1989
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*
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* Timecode transmission:
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* AM:
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* time marks are send every second except for the second before the
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* next minute mark
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* time marks consist of a reduction of transmitter power to 25%
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* of the nominal level
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* the falling edge is the time indication (on time)
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* time marks of a 100ms duration constitute a logical 0
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* time marks of a 200ms duration constitute a logical 1
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* FM:
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* see the spec. (basically a (non-)inverted psuedo random phase shift)
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*
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* Encoding:
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* Second Contents
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* 0 - 10 AM: free, FM: 0
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* 11 - 14 free
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* 15 R - alternate antenna
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* 16 A1 - expect zone change (1 hour before)
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* 17 - 18 Z1,Z2 - time zone
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* 0 0 illegal
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* 0 1 MEZ (MET)
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* 1 0 MESZ (MED, MET DST)
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* 1 1 illegal
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* 19 A2 - expect leap insertion/deletion (1 hour before)
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* 20 S - start of time code (1)
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* 21 - 24 M1 - BCD (lsb first) Minutes
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* 25 - 27 M10 - BCD (lsb first) 10 Minutes
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* 28 P1 - Minute Parity (even)
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* 29 - 32 H1 - BCD (lsb first) Hours
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* 33 - 34 H10 - BCD (lsb first) 10 Hours
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* 35 P2 - Hour Parity (even)
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* 36 - 39 D1 - BCD (lsb first) Days
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* 40 - 41 D10 - BCD (lsb first) 10 Days
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* 42 - 44 DW - BCD (lsb first) day of week (1: Monday -> 7: Sunday)
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* 45 - 49 MO - BCD (lsb first) Month
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* 50 MO0 - 10 Months
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* 51 - 53 Y1 - BCD (lsb first) Years
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* 54 - 57 Y10 - BCD (lsb first) 10 Years
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* 58 P3 - Date Parity (even)
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* 59 - usually missing (minute indication), except for leap insertion
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*/
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/*-----------------------------------------------------------------------
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* conversion table to map DCF77 bit stream into data fields.
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* Encoding:
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* Each field of the DCF77 code is described with two adjacent entries in
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* this table. The first entry specifies the offset into the DCF77 data stream
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* while the length is given as the difference between the start index and
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* the start index of the following field.
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*/
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static struct rawdcfcode
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{
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char offset; /* start bit */
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} rawdcfcode[] =
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{
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{ 0 }, { 15 }, { 16 }, { 17 }, { 19 }, { 20 }, { 21 }, { 25 }, { 28 }, { 29 },
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{ 33 }, { 35 }, { 36 }, { 40 }, { 42 }, { 45 }, { 49 }, { 50 }, { 54 }, { 58 }, { 59 }
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};
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/*-----------------------------------------------------------------------
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* symbolic names for the fields of DCF77 describes in "rawdcfcode".
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* see comment above for the structure of the DCF77 data
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*/
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#define DCF_M 0
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#define DCF_R 1
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#define DCF_A1 2
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#define DCF_Z 3
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#define DCF_A2 4
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#define DCF_S 5
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#define DCF_M1 6
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#define DCF_M10 7
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#define DCF_P1 8
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#define DCF_H1 9
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#define DCF_H10 10
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#define DCF_P2 11
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#define DCF_D1 12
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#define DCF_D10 13
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#define DCF_DW 14
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#define DCF_MO 15
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#define DCF_MO0 16
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#define DCF_Y1 17
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#define DCF_Y10 18
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#define DCF_P3 19
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/*-----------------------------------------------------------------------
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* parity field table (same encoding as rawdcfcode)
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* This table describes the sections of the DCF77 code that are
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* parity protected
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*/
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static struct partab
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{
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char offset; /* start bit of parity field */
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} partab[] =
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{
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{ 21 }, { 29 }, { 36 }, { 59 }
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};
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/*-----------------------------------------------------------------------
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* offsets for parity field descriptions
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*/
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#define DCF_P_P1 0
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#define DCF_P_P2 1
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#define DCF_P_P3 2
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/*-----------------------------------------------------------------------
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* legal values for time zone information
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*/
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#define DCF_Z_MET 0x2
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#define DCF_Z_MED 0x1
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/*-----------------------------------------------------------------------
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* symbolic representation if the DCF77 data stream
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*/
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static struct dcfparam
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{
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unsigned char onebits[60];
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unsigned char zerobits[60];
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} dcfparam =
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{
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"###############RADMLS1248124P124812P1248121241248112481248P", /* 'ONE' representation */
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"--------------------s-------p------p----------------------p" /* 'ZERO' representation */
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};
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/*-----------------------------------------------------------------------
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* extract a bitfield from DCF77 datastream
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* All numeric field are LSB first.
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* buf holds a pointer to a DCF77 data buffer in symbolic
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* representation
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* idx holds the index to the field description in rawdcfcode
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*/
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static unsigned long ext_bf(buf, idx)
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register unsigned char *buf;
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register int idx;
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{
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register unsigned long sum = 0;
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register int i, first;
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first = rawdcfcode[idx].offset;
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for (i = rawdcfcode[idx+1].offset - 1; i >= first; i--)
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{
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sum <<= 1;
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sum |= (buf[i] != dcfparam.zerobits[i]);
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}
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return sum;
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}
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/*-----------------------------------------------------------------------
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* check even parity integrity for a bitfield
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*
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* buf holds a pointer to a DCF77 data buffer in symbolic
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* representation
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* idx holds the index to the field description in partab
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*/
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static unsigned pcheck(buf, idx)
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register unsigned char *buf;
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register int idx;
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{
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register int i,last;
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register unsigned psum = 1;
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last = partab[idx+1].offset;
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for (i = partab[idx].offset; i < last; i++)
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psum ^= (buf[i] != dcfparam.zerobits[i]);
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return psum;
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}
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/*-----------------------------------------------------------------------
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* convert a DCF77 data buffer into wall clock time + flags
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*
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* buffer holds a pointer to a DCF77 data buffer in symbolic
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* representation
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* size describes the length of DCF77 information in bits (represented
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* as chars in symbolic notation
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* clock points to a wall clock time description of the DCF77 data (result)
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*/
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static unsigned long convert_rawdcf(buffer, size, clock)
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register unsigned char *buffer;
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register int size;
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register clocktime_t *clock;
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{
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if (size < 57)
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{
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PRINTF("%-30s", "*** INCOMPLETE");
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return CVT_NONE;
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}
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/*
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* check Start and Parity bits
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*/
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if ((ext_bf(buffer, DCF_S) == 1) &&
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pcheck(buffer, DCF_P_P1) &&
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pcheck(buffer, DCF_P_P2) &&
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pcheck(buffer, DCF_P_P3))
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{
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/*
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* buffer OK - extract all fields and build wall clock time from them
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*/
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clock->flags = 0;
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clock->usecond= 0;
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clock->second = 0;
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clock->minute = ext_bf(buffer, DCF_M10);
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clock->minute = TIMES10(clock->minute) + ext_bf(buffer, DCF_M1);
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clock->hour = ext_bf(buffer, DCF_H10);
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clock->hour = TIMES10(clock->hour) + ext_bf(buffer, DCF_H1);
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clock->day = ext_bf(buffer, DCF_D10);
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clock->day = TIMES10(clock->day) + ext_bf(buffer, DCF_D1);
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clock->month = ext_bf(buffer, DCF_MO0);
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clock->month = TIMES10(clock->month) + ext_bf(buffer, DCF_MO);
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clock->year = ext_bf(buffer, DCF_Y10);
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clock->year = TIMES10(clock->year) + ext_bf(buffer, DCF_Y1);
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clock->wday = ext_bf(buffer, DCF_DW);
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/*
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* determine offset to UTC by examining the time zone
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*/
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switch (ext_bf(buffer, DCF_Z))
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{
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case DCF_Z_MET:
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clock->utcoffset = -60;
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break;
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case DCF_Z_MED:
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clock->flags |= DCFB_DST;
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clock->utcoffset = -120;
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break;
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default:
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PRINTF("%-30s", "*** BAD TIME ZONE");
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return CVT_FAIL|CVT_BADFMT;
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}
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/*
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* extract various warnings from DCF77
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*/
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if (ext_bf(buffer, DCF_A1))
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clock->flags |= DCFB_ANNOUNCE;
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if (ext_bf(buffer, DCF_A2))
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clock->flags |= DCFB_LEAP;
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if (ext_bf(buffer, DCF_R))
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clock->flags |= DCFB_ALTERNATE;
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return CVT_OK;
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}
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else
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{
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/*
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* bad format - not for us
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*/
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PRINTF("%-30s", "*** BAD FORMAT (invalid/parity)");
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return CVT_FAIL|CVT_BADFMT;
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}
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}
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|
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/*-----------------------------------------------------------------------
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* raw dcf input routine - fix up 50 baud
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* characters for 1/0 decision
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*/
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static unsigned long cvt_rawdcf(buffer, size, clock)
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register unsigned char *buffer;
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register int size;
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register clocktime_t *clock;
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{
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register unsigned char *s = buffer;
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register unsigned char *e = buffer + size;
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register unsigned char *b = dcfparam.onebits;
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register unsigned char *c = dcfparam.zerobits;
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register unsigned rtc = CVT_NONE;
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register unsigned int i, lowmax, highmax, cutoff, span;
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#define BITS 9
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unsigned char histbuf[BITS];
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/*
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* the input buffer contains characters with runs of consecutive
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* bits set. These set bits are an indication of the DCF77 pulse
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* length. We assume that we receive the pulse at 50 Baud. Thus
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* a 100ms pulse would generate a 4 bit train (20ms per bit and
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* start bit)
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* a 200ms pulse would create all zeroes (and probably a frame error)
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*
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* The basic idea is that on corret reception we must have two
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* maxima in the pulse length distribution histogram. (one for
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* the zero representing pulses and one for the one representing
|
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* pulses)
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|
* There will always be ones in the datastream, thus we have to see
|
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* two maxima.
|
|
* The best point to cut for a 1/0 decision is the minimum between those
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* between the maxima. The following code tries to find this cutoff point.
|
|
*/
|
|
|
|
/*
|
|
* clear histogram buffer
|
|
*/
|
|
for (i = 0; i < BITS; i++)
|
|
{
|
|
histbuf[i] = 0;
|
|
}
|
|
|
|
cutoff = 0;
|
|
lowmax = 0;
|
|
|
|
/*
|
|
* convert sequences of set bits into bits counts updating
|
|
* the histogram alongway
|
|
*/
|
|
while (s < e)
|
|
{
|
|
register unsigned int ch = *s ^ 0xFF;
|
|
/*
|
|
* check integrity and update histogramm
|
|
*/
|
|
if (!((ch+1) & ch) || !*s)
|
|
{
|
|
/*
|
|
* character ok
|
|
*/
|
|
for (i = 0; ch; i++)
|
|
{
|
|
ch >>= 1;
|
|
}
|
|
|
|
*s = i;
|
|
histbuf[i]++;
|
|
cutoff += i;
|
|
lowmax++;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* invalid character (no consecutive bit sequence)
|
|
*/
|
|
dprintf(("parse: cvt_rawdcf: character check for 0x%x@%d FAILED\n", *s, s - buffer));
|
|
*s = ~0;
|
|
rtc = CVT_FAIL|CVT_BADFMT;
|
|
}
|
|
s++;
|
|
}
|
|
|
|
/*
|
|
* first cutoff estimate (average bit count - must be between both
|
|
* maxima)
|
|
*/
|
|
if (lowmax)
|
|
{
|
|
cutoff /= lowmax;
|
|
}
|
|
else
|
|
{
|
|
cutoff = 4; /* doesn't really matter - it'll fail anyway, but gives error output */
|
|
}
|
|
|
|
dprintf(("parse: cvt_rawdcf: average bit count: %d\n", cutoff));
|
|
|
|
lowmax = 0; /* weighted sum */
|
|
highmax = 0; /* bitcount */
|
|
|
|
/*
|
|
* collect weighted sum of lower bits (left of initial guess)
|
|
*/
|
|
dprintf(("parse: cvt_rawdcf: histogram:"));
|
|
for (i = 0; i <= cutoff; i++)
|
|
{
|
|
lowmax += histbuf[i] * i;
|
|
highmax += histbuf[i];
|
|
dprintf((" %d", histbuf[i]));
|
|
}
|
|
dprintf((" <M>"));
|
|
|
|
/*
|
|
* round up
|
|
*/
|
|
lowmax += highmax / 2;
|
|
|
|
/*
|
|
* calculate lower bit maximum (weighted sum / bit count)
|
|
*
|
|
* avoid divide by zero
|
|
*/
|
|
if (highmax)
|
|
{
|
|
lowmax /= highmax;
|
|
}
|
|
else
|
|
{
|
|
lowmax = 0;
|
|
}
|
|
|
|
highmax = 0; /* weighted sum of upper bits counts */
|
|
cutoff = 0; /* bitcount */
|
|
|
|
/*
|
|
* collect weighted sum of lower bits (right of initial guess)
|
|
*/
|
|
for (; i < BITS; i++)
|
|
{
|
|
highmax+=histbuf[i] * i;
|
|
cutoff +=histbuf[i];
|
|
dprintf((" %d", histbuf[i]));
|
|
}
|
|
dprintf(("\n"));
|
|
|
|
/*
|
|
* determine upper maximum (weighted sum / bit count)
|
|
*/
|
|
if (cutoff)
|
|
{
|
|
highmax /= cutoff;
|
|
}
|
|
else
|
|
{
|
|
highmax = BITS-1;
|
|
}
|
|
|
|
/*
|
|
* following now holds:
|
|
* lowmax <= cutoff(initial guess) <= highmax
|
|
* best cutoff is the minimum nearest to higher bits
|
|
*/
|
|
|
|
/*
|
|
* find the minimum between lowmax and highmax (detecting
|
|
* possibly a minimum span)
|
|
*/
|
|
span = cutoff = lowmax;
|
|
for (i = lowmax; i <= highmax; i++)
|
|
{
|
|
if (histbuf[cutoff] > histbuf[i])
|
|
{
|
|
/*
|
|
* got a new minimum move beginning of minimum (cutoff) and
|
|
* end of minimum (span) there
|
|
*/
|
|
cutoff = span = i;
|
|
}
|
|
else
|
|
if (histbuf[cutoff] == histbuf[i])
|
|
{
|
|
/*
|
|
* minimum not better yet - but it spans more than
|
|
* one bit value - follow it
|
|
*/
|
|
span = i;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* cutoff point for 1/0 decision is the middle of the minimum section
|
|
* in the histogram
|
|
*/
|
|
cutoff = (cutoff + span) / 2;
|
|
|
|
dprintf(("parse: cvt_rawdcf: lower maximum %d, higher maximum %d, cutoff %d\n", lowmax, highmax, cutoff));
|
|
|
|
/*
|
|
* convert the bit counts to symbolic 1/0 information for data conversion
|
|
*/
|
|
s = buffer;
|
|
while ((s < e) && *c && *b)
|
|
{
|
|
if (*s == (unsigned char)~0)
|
|
{
|
|
/*
|
|
* invalid character
|
|
*/
|
|
*s = '?';
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* symbolic 1/0 representation
|
|
*/
|
|
*s = (*s >= cutoff) ? *b : *c;
|
|
}
|
|
s++;
|
|
b++;
|
|
c++;
|
|
}
|
|
|
|
/*
|
|
* if everything went well so far return the result of the symbolic
|
|
* conversion routine else just the accumulated errors
|
|
*/
|
|
if (rtc != CVT_NONE)
|
|
{
|
|
PRINTF("%-30s", "*** BAD DATA");
|
|
}
|
|
|
|
return (rtc == CVT_NONE) ? convert_rawdcf(buffer, size, clock) : rtc;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* convert a wall clock time description of DCF77 to a Unix time (seconds
|
|
* since 1.1. 1970 UTC)
|
|
*/
|
|
time_t
|
|
dcf_to_unixtime(clock, cvtrtc)
|
|
register clocktime_t *clock;
|
|
register unsigned long *cvtrtc;
|
|
{
|
|
#define SETRTC(_X_) { if (cvtrtc) *cvtrtc = (_X_); }
|
|
static int days_of_month[] =
|
|
{
|
|
0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
|
|
};
|
|
register int i;
|
|
time_t t;
|
|
|
|
/*
|
|
* map 2 digit years to 19xx (DCF77 is a 20th century item)
|
|
*/
|
|
if (clock->year < 100)
|
|
clock->year += 1900;
|
|
|
|
/*
|
|
* assume that we convert timecode within the unix/UTC epoch -
|
|
* prolonges validity of 2 digit years
|
|
*/
|
|
if (clock->year < 1994)
|
|
clock->year += 100; /* XXX this will do it till <2094 */
|
|
|
|
/*
|
|
* must have been a really negative year code - drop it
|
|
*/
|
|
if (clock->year < 0)
|
|
{
|
|
SETRTC(CVT_FAIL|CVT_BADDATE);
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* sorry, slow section here - but it's not time critical anyway
|
|
*/
|
|
|
|
/*
|
|
* calculate days since 1970 (watching leap years)
|
|
*/
|
|
t = (clock->year - 1970) * 365;
|
|
t += (clock->year >> 2) - (1970 >> 2);
|
|
t -= clock->year / 400 - 1970 / 400;
|
|
|
|
/* month */
|
|
if (clock->month <= 0 || clock->month > 12)
|
|
{
|
|
SETRTC(CVT_FAIL|CVT_BADDATE);
|
|
return -1; /* bad month */
|
|
}
|
|
/* adjust current leap year */
|
|
if (clock->month >= 3 && dysize(clock->year) == 366)
|
|
t++;
|
|
|
|
/*
|
|
* collect days from months excluding the current one
|
|
*/
|
|
for (i = 1; i < clock->month; i++)
|
|
{
|
|
t += days_of_month[i];
|
|
}
|
|
/* day */
|
|
if (clock->day < 1 || ((clock->month == 2 && dysize(clock->year) == 366) ?
|
|
clock->day > 29 : clock->day > days_of_month[clock->month]))
|
|
{
|
|
SETRTC(CVT_FAIL|CVT_BADDATE);
|
|
return -1; /* bad day */
|
|
}
|
|
|
|
/*
|
|
* collect days from date excluding the current one
|
|
*/
|
|
t += clock->day - 1;
|
|
|
|
/* hour */
|
|
if (clock->hour < 0 || clock->hour >= 24)
|
|
{
|
|
SETRTC(CVT_FAIL|CVT_BADTIME);
|
|
return -1; /* bad hour */
|
|
}
|
|
|
|
/*
|
|
* calculate hours from 1. 1. 1970
|
|
*/
|
|
t = TIMES24(t) + clock->hour;
|
|
|
|
/* min */
|
|
if (clock->minute < 0 || clock->minute > 59)
|
|
{
|
|
SETRTC(CVT_FAIL|CVT_BADTIME);
|
|
return -1; /* bad min */
|
|
}
|
|
|
|
/*
|
|
* calculate minutes from 1. 1. 1970
|
|
*/
|
|
t = TIMES60(t) + clock->minute;
|
|
/* sec */
|
|
|
|
/*
|
|
* calculate UTC in minutes
|
|
*/
|
|
t += clock->utcoffset;
|
|
|
|
if (clock->second < 0 || clock->second > 60) /* allow for LEAPs */
|
|
{
|
|
SETRTC(CVT_FAIL|CVT_BADTIME);
|
|
return -1; /* bad sec */
|
|
}
|
|
|
|
/*
|
|
* calculate UTC in seconds - phew !
|
|
*/
|
|
t = TIMES60(t) + clock->second;
|
|
/* done */
|
|
return t;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* cheap half baked 1/0 decision - for interactive operation only
|
|
*/
|
|
static char type(c)
|
|
unsigned char c;
|
|
{
|
|
c ^= 0xFF;
|
|
return (c > 0xF);
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* week day representation
|
|
*/
|
|
static char *wday[8] =
|
|
{
|
|
"??",
|
|
"Mo",
|
|
"Tu",
|
|
"We",
|
|
"Th",
|
|
"Fr",
|
|
"Sa",
|
|
"Su"
|
|
};
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* generate a string representation for a timeval
|
|
*/
|
|
static char * pr_timeval(val)
|
|
struct timeval *val;
|
|
{
|
|
static char buf[20];
|
|
|
|
if (val->tv_sec == 0)
|
|
sprintf(buf, "%c0.%06ld", (val->tv_usec < 0) ? '-' : '+', (long int)abs(val->tv_usec));
|
|
else
|
|
sprintf(buf, "%ld.%06ld", (long int)val->tv_sec, (long int)abs(val->tv_usec));
|
|
return buf;
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* correct the current time by an offset by setting the time rigorously
|
|
*/
|
|
static void set_time(offset)
|
|
struct timeval *offset;
|
|
{
|
|
struct timeval the_time;
|
|
|
|
if (no_set)
|
|
return;
|
|
|
|
LPRINTF("set_time: %s ", pr_timeval(offset));
|
|
syslog(LOG_NOTICE, "setting time (offset %s)", pr_timeval(offset));
|
|
|
|
if (gettimeofday(&the_time, 0L) == -1)
|
|
{
|
|
perror("gettimeofday()");
|
|
}
|
|
else
|
|
{
|
|
timeradd(&the_time, offset);
|
|
if (settimeofday(&the_time, 0L) == -1)
|
|
{
|
|
perror("settimeofday()");
|
|
}
|
|
}
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* slew the time by a given offset
|
|
*/
|
|
static void adj_time(offset)
|
|
register long offset;
|
|
{
|
|
struct timeval time_offset;
|
|
|
|
if (no_set)
|
|
return;
|
|
|
|
time_offset.tv_sec = offset / 1000000;
|
|
time_offset.tv_usec = offset % 1000000;
|
|
|
|
LPRINTF("adj_time: %ld us ", (long int)offset);
|
|
if (adjtime(&time_offset, 0L) == -1)
|
|
perror("adjtime()");
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* read in a possibly previously written drift value
|
|
*/
|
|
static void read_drift(drift_file)
|
|
char *drift_file;
|
|
{
|
|
FILE *df;
|
|
|
|
df = fopen(drift_file, "r");
|
|
if (df != NULL)
|
|
{
|
|
int idrift, fdrift;
|
|
|
|
fscanf(df, "%4d.%03d", &idrift, &fdrift);
|
|
fclose(df);
|
|
LPRINTF("read_drift: %d.%03d ppm ", idrift, fdrift);
|
|
|
|
drift_comp = idrift << USECSCALE;
|
|
fdrift = (fdrift << USECSCALE) / 1000;
|
|
drift_comp += fdrift & (1<<USECSCALE);
|
|
LPRINTF("read_drift: drift_comp %ld ", (long int)drift_comp);
|
|
}
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* write out the current drift value
|
|
*/
|
|
static void update_drift(drift_file, offset, reftime)
|
|
char *drift_file;
|
|
long offset;
|
|
time_t reftime;
|
|
{
|
|
FILE *df;
|
|
|
|
df = fopen(drift_file, "w");
|
|
if (df != NULL)
|
|
{
|
|
int idrift = R_SHIFT(drift_comp, USECSCALE);
|
|
int fdrift = drift_comp & ((1<<USECSCALE)-1);
|
|
|
|
LPRINTF("update_drift: drift_comp %ld ", (long int)drift_comp);
|
|
fdrift = (fdrift * 1000) / (1<<USECSCALE);
|
|
fprintf(df, "%4d.%03d %c%ld.%06ld %.24s\n", idrift, fdrift,
|
|
(offset < 0) ? '-' : '+', (long int)(abs(offset) / 1000000),
|
|
(long int)(abs(offset) % 1000000), asctime(localtime(&reftime)));
|
|
fclose(df);
|
|
LPRINTF("update_drift: %d.%03d ppm ", idrift, fdrift);
|
|
}
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* process adjustments derived from the DCF77 observation
|
|
* (controls clock PLL)
|
|
*/
|
|
static void adjust_clock(offset, drift_file, reftime)
|
|
struct timeval *offset;
|
|
char *drift_file;
|
|
time_t reftime;
|
|
{
|
|
struct timeval toffset;
|
|
register long usecoffset;
|
|
int tmp;
|
|
|
|
if (no_set)
|
|
return;
|
|
|
|
if (skip_adjust)
|
|
{
|
|
skip_adjust = 0;
|
|
return;
|
|
}
|
|
|
|
toffset = *offset;
|
|
toffset.tv_sec = abs(toffset.tv_sec);
|
|
toffset.tv_usec = abs(toffset.tv_usec);
|
|
if (timercmp(&toffset, &max_adj_offset, >))
|
|
{
|
|
/*
|
|
* hopeless - set the clock - and clear the timing
|
|
*/
|
|
set_time(offset);
|
|
clock_adjust = 0;
|
|
skip_adjust = 1;
|
|
return;
|
|
}
|
|
|
|
usecoffset = offset->tv_sec * 1000000 + offset->tv_usec;
|
|
|
|
clock_adjust = R_SHIFT(usecoffset, TIMECONSTANT); /* adjustment to make for next period */
|
|
|
|
tmp = 0;
|
|
while (adjustments > (1 << tmp))
|
|
tmp++;
|
|
adjustments = 0;
|
|
if (tmp > FREQ_WEIGHT)
|
|
tmp = FREQ_WEIGHT;
|
|
|
|
drift_comp += R_SHIFT(usecoffset << USECSCALE, TIMECONSTANT+TIMECONSTANT+FREQ_WEIGHT-tmp);
|
|
|
|
if (drift_comp > MAX_DRIFT) /* clamp into interval */
|
|
drift_comp = MAX_DRIFT;
|
|
else
|
|
if (drift_comp < -MAX_DRIFT)
|
|
drift_comp = -MAX_DRIFT;
|
|
|
|
update_drift(drift_file, usecoffset, reftime);
|
|
LPRINTF("clock_adjust: %s, clock_adjust %ld, drift_comp %ld(%ld) ",
|
|
pr_timeval(offset),(long int) R_SHIFT(clock_adjust, USECSCALE),
|
|
(long int)R_SHIFT(drift_comp, USECSCALE), (long int)drift_comp);
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* adjust the clock by a small mount to simulate frequency correction
|
|
*/
|
|
static void periodic_adjust()
|
|
{
|
|
register long adjustment;
|
|
|
|
adjustments++;
|
|
|
|
adjustment = R_SHIFT(clock_adjust, PHASE_WEIGHT);
|
|
|
|
clock_adjust -= adjustment;
|
|
|
|
adjustment += R_SHIFT(drift_comp, USECSCALE+ADJINTERVAL);
|
|
|
|
adj_time(adjustment);
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* control synchronisation status (warnings) and do periodic adjusts
|
|
* (frequency control simulation)
|
|
*/
|
|
static void tick()
|
|
{
|
|
static unsigned long last_notice = 0;
|
|
|
|
#ifndef SV_ONSTACK
|
|
(void)signal(SIGALRM, tick);
|
|
#endif
|
|
|
|
periodic_adjust();
|
|
|
|
ticks += 1<<ADJINTERVAL;
|
|
|
|
if ((ticks - last_sync) > MAX_UNSYNC)
|
|
{
|
|
/*
|
|
* not getting time for a while
|
|
*/
|
|
if (sync_state == SYNC)
|
|
{
|
|
/*
|
|
* completely lost information
|
|
*/
|
|
sync_state = NO_SYNC;
|
|
syslog(LOG_INFO, "DCF77 reception lost (timeout)");
|
|
last_notice = ticks;
|
|
}
|
|
else
|
|
/*
|
|
* in NO_SYNC state - look whether its time to speak up again
|
|
*/
|
|
if ((ticks - last_notice) > NOTICE_INTERVAL)
|
|
{
|
|
syslog(LOG_NOTICE, "still not synchronized to DCF77 - check receiver/signal");
|
|
last_notice = ticks;
|
|
}
|
|
}
|
|
|
|
#ifndef ITIMER_REAL
|
|
(void) alarm(1<<ADJINTERVAL);
|
|
#endif
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* break association from terminal to avoid catching terminal
|
|
* or process group related signals (-> daemon operation)
|
|
*/
|
|
static void detach()
|
|
{
|
|
int s;
|
|
|
|
if (fork())
|
|
exit(0);
|
|
|
|
for (s = 0; s < 3; s++)
|
|
(void) close(s);
|
|
(void) open("/", 0);
|
|
(void) dup2(0, 1);
|
|
(void) dup2(0, 2);
|
|
|
|
#if defined(NTP_POSIX_SOURCE) || defined(_POSIX_)
|
|
(void) setsid();
|
|
#else /* _POSIX_ */
|
|
#ifndef BSD
|
|
(void) setpgrp();
|
|
#else /* BSD */
|
|
(void) setpgrp(0, getpid());
|
|
#endif /* BSD */
|
|
#endif /* _POSIX_ */
|
|
#if defined(hpux)
|
|
if (fork())
|
|
exit(0);
|
|
#endif /* hpux */
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* list possible arguments and options
|
|
*/
|
|
static void usage(program)
|
|
char *program;
|
|
{
|
|
fprintf(stderr, "usage: %s [-f] [-l] [-t] [-i] [-o] [-d <drift_file>] <device>\n", program);
|
|
fprintf(stderr, "\t-n do not change time\n");
|
|
fprintf(stderr, "\t-i interactive\n");
|
|
fprintf(stderr, "\t-t trace (print all datagrams)\n");
|
|
fprintf(stderr, "\t-f print all databits (includes PTB private data)\n");
|
|
fprintf(stderr, "\t-l print loop filter debug information\n");
|
|
fprintf(stderr, "\t-o print offet average for current minute\n");
|
|
fprintf(stderr, "\t-d <drift_file> specify alternate drift file\n");
|
|
fprintf(stderr, "\t-D <input delay>specify delay from input edge to processing in micro seconds\n");
|
|
}
|
|
|
|
/*-----------------------------------------------------------------------
|
|
* main loop - argument interpreter / setup / main loop
|
|
*/
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
unsigned char c;
|
|
char **a = argv;
|
|
int ac = argc;
|
|
char *file = NULL;
|
|
char *drift_file = "/etc/dcfd.drift";
|
|
int fd;
|
|
int offset = 15;
|
|
int offsets = 0;
|
|
int delay = DEFAULT_DELAY; /* average delay from input edge to time stamping */
|
|
int trace = 0;
|
|
int errs = 0;
|
|
|
|
/*
|
|
* process arguments
|
|
*/
|
|
while (--ac)
|
|
{
|
|
char *arg = *++a;
|
|
if (*arg == '-')
|
|
while ((c = *++arg))
|
|
switch (c)
|
|
{
|
|
case 't':
|
|
trace = 1;
|
|
interactive = 1;
|
|
break;
|
|
|
|
case 'f':
|
|
offset = 0;
|
|
interactive = 1;
|
|
break;
|
|
|
|
case 'l':
|
|
loop_filter_debug = 1;
|
|
offsets = 1;
|
|
interactive = 1;
|
|
break;
|
|
|
|
case 'n':
|
|
no_set = 1;
|
|
break;
|
|
|
|
case 'o':
|
|
offsets = 1;
|
|
interactive = 1;
|
|
break;
|
|
|
|
case 'i':
|
|
interactive = 1;
|
|
break;
|
|
|
|
case 'D':
|
|
if (ac > 1)
|
|
{
|
|
delay = atoi(*++a);
|
|
ac--;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "%s: -D requires integer argument\n", argv[0]);
|
|
errs=1;
|
|
}
|
|
break;
|
|
|
|
case 'd':
|
|
if (ac > 1)
|
|
{
|
|
drift_file = *++a;
|
|
ac--;
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "%s: -d requires file name argument\n", argv[0]);
|
|
errs=1;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
fprintf(stderr, "%s: unknown option -%c\n", argv[0], c);
|
|
errs=1;
|
|
break;
|
|
}
|
|
else
|
|
if (file == NULL)
|
|
file = arg;
|
|
else
|
|
{
|
|
fprintf(stderr, "%s: device specified twice\n", argv[0]);
|
|
errs=1;
|
|
}
|
|
}
|
|
|
|
if (errs)
|
|
{
|
|
usage(argv[0]);
|
|
exit(1);
|
|
}
|
|
else
|
|
if (file == NULL)
|
|
{
|
|
fprintf(stderr, "%s: device not specified\n", argv[0]);
|
|
usage(argv[0]);
|
|
exit(1);
|
|
}
|
|
|
|
errs = LINES+1;
|
|
|
|
/*
|
|
* get access to DCF77 tty port
|
|
*/
|
|
#if defined(SYS_FREEBSD) && defined(BOEDER)
|
|
fd = open(file, O_RDONLY | O_NONBLOCK);
|
|
#else
|
|
fd = open(file, O_RDONLY);
|
|
#endif
|
|
if (fd == -1)
|
|
{
|
|
perror(file);
|
|
exit(1);
|
|
}
|
|
else
|
|
{
|
|
int i, rrc;
|
|
struct timeval t, tt, tlast;
|
|
struct timeval timeout;
|
|
struct timeval phase;
|
|
struct timeval time_offset;
|
|
char pbuf[61]; /* printable version */
|
|
char buf[61]; /* raw data */
|
|
clocktime_t clock; /* wall clock time */
|
|
time_t utc_time = 0;
|
|
time_t last_utc_time = 0;
|
|
long usecerror = 0;
|
|
long lasterror = 0;
|
|
#if defined(HAVE_TERMIOS) || defined(STREAM)
|
|
struct termios term;
|
|
#endif
|
|
#if defined(HAVE_TERMIO) || defined(HAVE_SYSV_TTYS)
|
|
struct termio term;
|
|
#endif
|
|
int rtc = CVT_NONE;
|
|
|
|
timeout.tv_sec = 1;
|
|
timeout.tv_usec = 500000;
|
|
|
|
phase.tv_sec = 0;
|
|
phase.tv_usec = delay;
|
|
|
|
/*
|
|
* setup TTY (50 Baud, Read, 8Bit, No Hangup, 1 character IO)
|
|
*/
|
|
if (TTY_GETATTR(fd, &term) == -1)
|
|
{
|
|
perror("tcgetattr");
|
|
exit(1);
|
|
}
|
|
|
|
memset(term.c_cc, 0, sizeof(term.c_cc));
|
|
term.c_cc[VMIN] = 1;
|
|
#if defined(SYS_FREEBSD)
|
|
term.c_cflag = CS8|CREAD|CLOCAL|PARENB;
|
|
term.c_iflag = 0;
|
|
#else
|
|
term.c_cflag = B50|CS8|CREAD|CLOCAL|PARENB;
|
|
term.c_iflag = IGNPAR;
|
|
#endif
|
|
term.c_oflag = 0;
|
|
term.c_lflag = 0;
|
|
|
|
#if defined(SYS_FREEBSD)
|
|
if (cfsetspeed(&term, B50) == -1)
|
|
perror("cfsetspeed");
|
|
#endif
|
|
if (TTY_SETATTR(fd, &term) == -1)
|
|
{
|
|
perror("tcsetattr");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* loose terminal if in daemon operation
|
|
*/
|
|
if (!interactive)
|
|
detach();
|
|
|
|
/*
|
|
* get syslog() initialized
|
|
*/
|
|
#ifdef LOG_DAEMON
|
|
openlog("dcfd", LOG_PID, LOG_DAEMON);
|
|
#else
|
|
openlog("dcfd", LOG_PID);
|
|
#endif
|
|
|
|
/*
|
|
* setup periodic operations (state control / frequency control)
|
|
*/
|
|
#ifdef SV_ONSTACK
|
|
{
|
|
struct sigvec vec;
|
|
|
|
vec.sv_handler = tick;
|
|
vec.sv_mask = 0;
|
|
vec.sv_flags = 0;
|
|
|
|
if (sigvec(SIGALRM, &vec, (struct sigvec *)0) == -1)
|
|
{
|
|
syslog(LOG_ERR, "sigvec(SIGALRM): %m");
|
|
exit(1);
|
|
}
|
|
}
|
|
#else
|
|
(void) signal(SIGALRM, tick);
|
|
#endif
|
|
|
|
#ifdef ITIMER_REAL
|
|
{
|
|
struct itimerval it;
|
|
|
|
it.it_interval.tv_sec = 1<<ADJINTERVAL;
|
|
it.it_interval.tv_usec = 0;
|
|
it.it_value.tv_sec = 1<<ADJINTERVAL;
|
|
it.it_value.tv_usec = 0;
|
|
|
|
if (setitimer(ITIMER_REAL, &it, (struct itimerval *)0) == -1)
|
|
{
|
|
syslog(LOG_ERR, "setitimer: %m");
|
|
exit(1);
|
|
}
|
|
}
|
|
#else
|
|
(void) alarm(1<<ADJINTERVAL);
|
|
#endif
|
|
#if defined(SYS_FREEBSD) && defined(BOEDER)
|
|
if (fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) & ~O_NONBLOCK) == -1)
|
|
perror("F_SETFL");
|
|
|
|
if (ioctl(fd, TIOCCDTR, 0) == -1)
|
|
perror("TIOCCDTR");
|
|
#endif
|
|
|
|
PRINTF(" DCF77 monitor - Copyright 1993,1994, Frank Kardel\n\n");
|
|
syslog(LOG_NOTICE, "Starting on %s", file);
|
|
|
|
pbuf[60] = '\0';
|
|
for ( i = 0; i < 60; i++)
|
|
pbuf[i] = '.';
|
|
|
|
read_drift(drift_file);
|
|
|
|
/*
|
|
* what time is it now (for interval measurement)
|
|
*/
|
|
gettimeofday(&tlast, 0L);
|
|
i = 0;
|
|
/*
|
|
* loop until input trouble ...
|
|
*/
|
|
do
|
|
{
|
|
/*
|
|
* get an impulse
|
|
*/
|
|
while ((rrc = read(fd, &c, 1)) == 1)
|
|
{
|
|
gettimeofday(&t, 0L);
|
|
tt = t;
|
|
timersub(&t, &tlast);
|
|
|
|
if (errs > LINES)
|
|
{
|
|
PRINTF(" %s", &"PTB private....RADMLSMin....PHour..PMDay..DayMonthYear....P\n"[offset]);
|
|
PRINTF(" %s", &"---------------RADMLS1248124P124812P1248121241248112481248P\n"[offset]);
|
|
errs = 0;
|
|
}
|
|
|
|
/*
|
|
* timeout -> possible minute mark -> interpretation
|
|
*/
|
|
if (timercmp(&t, &timeout, >))
|
|
{
|
|
PRINTF("%c %.*s ", pat[i % (sizeof(pat)-1)], 59 - offset, &pbuf[offset]);
|
|
|
|
if ((rtc = cvt_rawdcf(buf, i, &clock)) != CVT_OK)
|
|
{
|
|
/*
|
|
* this data was bad - well - forget synchronisation for now
|
|
*/
|
|
PRINTF("\n");
|
|
if (sync_state == SYNC)
|
|
{
|
|
sync_state = NO_SYNC;
|
|
syslog(LOG_INFO, "DCF77 reception lost (bad data)");
|
|
}
|
|
errs++;
|
|
}
|
|
else
|
|
if (trace)
|
|
{
|
|
PRINTF("\r %.*s ", 59 - offset, &buf[offset]);
|
|
}
|
|
|
|
|
|
buf[0] = c;
|
|
|
|
/*
|
|
* collect first character
|
|
*/
|
|
if (((c^0xFF)+1) & (c^0xFF))
|
|
pbuf[0] = '?';
|
|
else
|
|
pbuf[0] = type(c) ? '#' : '-';
|
|
|
|
for ( i = 1; i < 60; i++)
|
|
pbuf[i] = '.';
|
|
|
|
i = 0;
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* collect character
|
|
*/
|
|
buf[i] = c;
|
|
|
|
/*
|
|
* initial guess (usually correct)
|
|
*/
|
|
if (((c^0xFF)+1) & (c^0xFF))
|
|
pbuf[i] = '?';
|
|
else
|
|
pbuf[i] = type(c) ? '#' : '-';
|
|
|
|
PRINTF("%c %.*s ", pat[i % (sizeof(pat)-1)], 59 - offset, &pbuf[offset]);
|
|
}
|
|
|
|
if (i == 0 && rtc == CVT_OK)
|
|
{
|
|
/*
|
|
* we got a good time code here - try to convert it to
|
|
* UTC
|
|
*/
|
|
if ((utc_time = dcf_to_unixtime(&clock, &rtc)) == -1)
|
|
{
|
|
PRINTF("*** BAD CONVERSION\n");
|
|
}
|
|
|
|
if (utc_time != (last_utc_time + 60))
|
|
{
|
|
/*
|
|
* well, two successive sucessful telegrams are not 60 seconds
|
|
* apart
|
|
*/
|
|
PRINTF("*** NO MINUTE INC\n");
|
|
if (sync_state == SYNC)
|
|
{
|
|
sync_state = NO_SYNC;
|
|
syslog(LOG_INFO, "DCF77 reception lost (data mismatch)");
|
|
}
|
|
errs++;
|
|
rtc = CVT_FAIL|CVT_BADTIME|CVT_BADDATE;
|
|
}
|
|
else
|
|
usecerror = 0;
|
|
|
|
last_utc_time = utc_time;
|
|
}
|
|
|
|
if (rtc == CVT_OK)
|
|
{
|
|
if (i == 0)
|
|
{
|
|
/*
|
|
* valid time code - determine offset and
|
|
* note regained reception
|
|
*/
|
|
last_sync = ticks;
|
|
if (sync_state == NO_SYNC)
|
|
{
|
|
syslog(LOG_INFO, "receiving DCF77");
|
|
}
|
|
else
|
|
{
|
|
/*
|
|
* we had at least one minute SYNC - thus
|
|
* last error is valid
|
|
*/
|
|
#if defined(BOEDER)
|
|
if (abs(utc_time - tt.tv_sec) > 10)
|
|
{
|
|
time_offset.tv_sec = utc_time - tt.tv_sec;
|
|
time_offset.tv_usec = 0;
|
|
}
|
|
else
|
|
{
|
|
time_offset.tv_sec = lasterror / 1000000;
|
|
time_offset.tv_usec = lasterror % 1000000;
|
|
}
|
|
#else
|
|
time_offset.tv_sec = lasterror / 1000000;
|
|
time_offset.tv_usec = lasterror % 1000000;
|
|
#endif
|
|
adjust_clock(&time_offset, drift_file, utc_time);
|
|
}
|
|
sync_state = SYNC;
|
|
}
|
|
|
|
time_offset.tv_sec = utc_time + i;
|
|
time_offset.tv_usec = 0;
|
|
|
|
timeradd(&time_offset, &phase);
|
|
|
|
usecerror += (time_offset.tv_sec - tt.tv_sec) * 1000000 + time_offset.tv_usec
|
|
-tt.tv_usec;
|
|
|
|
/*
|
|
* output interpreted DCF77 data
|
|
*/
|
|
PRINTF(offsets ? "%s, %2d:%02d:%02d, %d.%02d.%02d, <%s%s%s%s> (%c%d.%06ds)" :
|
|
"%s, %2d:%02d:%02d, %d.%02d.%02d, <%s%s%s%s>",
|
|
wday[clock.wday],
|
|
clock.hour, clock.minute, i, clock.day, clock.month,
|
|
clock.year,
|
|
(clock.flags & DCFB_ALTERNATE) ? "R" : "_",
|
|
(clock.flags & DCFB_ANNOUNCE) ? "A" : "_",
|
|
(clock.flags & DCFB_DST) ? "D" : "_",
|
|
(clock.flags & DCFB_LEAP) ? "L" : "_",
|
|
(lasterror < 0) ? '-' : '+', abs(lasterror) / 1000000, abs(lasterror) % 1000000
|
|
);
|
|
|
|
if (trace && (i == 0))
|
|
{
|
|
PRINTF("\n");
|
|
errs++;
|
|
}
|
|
lasterror = usecerror / (i+1);
|
|
}
|
|
else
|
|
{
|
|
lasterror = 0; /* we cannot calculate phase errors on bad reception */
|
|
}
|
|
|
|
PRINTF("\r");
|
|
|
|
if (i < 60)
|
|
{
|
|
i++;
|
|
}
|
|
|
|
tlast = tt;
|
|
|
|
if (interactive)
|
|
fflush(stdout);
|
|
}
|
|
} while ((rrc == -1) && (errno == EINTR));
|
|
|
|
/*
|
|
* lost IO - sorry guys
|
|
*/
|
|
syslog(LOG_ERR, "TERMINATING - cannot read from device %s (%m)", file);
|
|
|
|
(void)close(fd);
|
|
}
|
|
|
|
closelog();
|
|
|
|
return 0;
|
|
}
|