618 lines
14 KiB
C
618 lines
14 KiB
C
/* $NetBSD: clk_rawdcf.c,v 1.3 2003/12/04 16:23:37 drochner Exp $ */
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/*
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* /src/NTP/ntp-4/libparse/clk_rawdcf.c,v 4.9 1999/12/06 13:42:23 kardel Exp
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*
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* clk_rawdcf.c,v 4.9 1999/12/06 13:42:23 kardel Exp
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*
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* Raw DCF77 pulse clock support
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*
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* Copyright (C) 1992-1998 by Frank Kardel
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* Friedrich-Alexander Universität Erlangen-Nürnberg, Germany
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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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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#if defined(REFCLOCK) && defined(CLOCK_PARSE) && defined(CLOCK_RAWDCF)
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#include "ntp_fp.h"
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#include "ntp_unixtime.h"
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#include "ntp_calendar.h"
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#include "parse.h"
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#ifdef PARSESTREAM
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# include <sys/parsestreams.h>
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#endif
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#ifndef PARSEKERNEL
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# include "ntp_stdlib.h"
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#endif
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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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static u_long pps_rawdcf P((parse_t *, int, timestamp_t *));
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static u_long cvt_rawdcf P((unsigned char *, int, struct format *, clocktime_t *, void *));
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static u_long inp_rawdcf P((parse_t *, unsigned int, timestamp_t *));
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typedef struct last_tcode {
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time_t tcode; /* last converted time code */
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} last_tcode_t;
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clockformat_t clock_rawdcf =
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{
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inp_rawdcf, /* DCF77 input handling */
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cvt_rawdcf, /* raw dcf input conversion */
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pps_rawdcf, /* examining PPS information */
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0, /* no private configuration data */
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"RAW DCF77 Timecode", /* direct decoding / time synthesis */
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61, /* bit buffer */
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sizeof(last_tcode_t)
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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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} dcfparameter =
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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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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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#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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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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#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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#define DCF_Z_MET 0x2
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#define DCF_Z_MED 0x1
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static u_long
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ext_bf(
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register unsigned char *buf,
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register int idx,
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register unsigned char *zero
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)
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{
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register u_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] != zero[i]);
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}
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return sum;
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}
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static unsigned
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pcheck(
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unsigned char *buf,
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int idx,
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unsigned char *zero
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)
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{
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int i,last;
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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] != zero[i]);
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return psum;
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}
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static u_long
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convert_rawdcf(
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unsigned char *buffer,
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int size,
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struct dcfparam *dcfprm,
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clocktime_t *clock_time
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)
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{
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register unsigned char *s = buffer;
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register unsigned char *b = dcfprm->onebits;
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register unsigned char *c = dcfprm->zerobits;
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register int i;
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parseprintf(DD_RAWDCF,("parse: convert_rawdcf: \"%s\"\n", buffer));
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if (size < 57)
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{
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#ifndef PARSEKERNEL
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msyslog(LOG_ERR, "parse: convert_rawdcf: INCOMPLETE DATA - time code only has %d bits\n", size);
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#endif
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return CVT_NONE;
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}
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for (i = 0; i < 58; i++)
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{
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if ((*s != *b) && (*s != *c))
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{
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/*
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* we only have two types of bytes (ones and zeros)
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*/
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#ifndef PARSEKERNEL
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msyslog(LOG_ERR, "parse: convert_rawdcf: BAD DATA - no conversion for \"%s\"\n", buffer);
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#endif
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return CVT_NONE;
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}
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b++;
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c++;
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s++;
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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, dcfprm->zerobits) == 1) &&
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pcheck(buffer, DCF_P_P1, dcfprm->zerobits) &&
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pcheck(buffer, DCF_P_P2, dcfprm->zerobits) &&
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pcheck(buffer, DCF_P_P3, dcfprm->zerobits))
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{
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/*
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* buffer OK
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*/
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parseprintf(DD_RAWDCF,("parse: convert_rawdcf: parity check passed\n"));
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clock_time->flags = PARSEB_S_ANTENNA|PARSEB_S_LEAP;
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clock_time->utctime= 0;
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clock_time->usecond= 0;
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clock_time->second = 0;
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clock_time->minute = ext_bf(buffer, DCF_M10, dcfprm->zerobits);
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clock_time->minute = TIMES10(clock_time->minute) + ext_bf(buffer, DCF_M1, dcfprm->zerobits);
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clock_time->hour = ext_bf(buffer, DCF_H10, dcfprm->zerobits);
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clock_time->hour = TIMES10(clock_time->hour) + ext_bf(buffer, DCF_H1, dcfprm->zerobits);
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clock_time->day = ext_bf(buffer, DCF_D10, dcfprm->zerobits);
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clock_time->day = TIMES10(clock_time->day) + ext_bf(buffer, DCF_D1, dcfprm->zerobits);
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clock_time->month = ext_bf(buffer, DCF_MO0, dcfprm->zerobits);
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clock_time->month = TIMES10(clock_time->month) + ext_bf(buffer, DCF_MO, dcfprm->zerobits);
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clock_time->year = ext_bf(buffer, DCF_Y10, dcfprm->zerobits);
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clock_time->year = TIMES10(clock_time->year) + ext_bf(buffer, DCF_Y1, dcfprm->zerobits);
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switch (ext_bf(buffer, DCF_Z, dcfprm->zerobits))
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{
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case DCF_Z_MET:
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clock_time->utcoffset = -1*60*60;
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break;
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case DCF_Z_MED:
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clock_time->flags |= PARSEB_DST;
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clock_time->utcoffset = -2*60*60;
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break;
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default:
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parseprintf(DD_RAWDCF,("parse: convert_rawdcf: BAD TIME ZONE\n"));
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return CVT_FAIL|CVT_BADFMT;
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}
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if (ext_bf(buffer, DCF_A1, dcfprm->zerobits))
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clock_time->flags |= PARSEB_ANNOUNCE;
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if (ext_bf(buffer, DCF_A2, dcfprm->zerobits))
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clock_time->flags |= PARSEB_LEAPADD; /* default: DCF77 data format deficiency */
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if (ext_bf(buffer, DCF_R, dcfprm->zerobits))
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clock_time->flags |= PARSEB_ALTERNATE;
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parseprintf(DD_RAWDCF,("parse: convert_rawdcf: TIME CODE OK: %d:%d, %d.%d.%d, flags 0x%lx\n",
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(int)clock_time->hour, (int)clock_time->minute, (int)clock_time->day, (int)clock_time->month,(int) clock_time->year,
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(u_long)clock_time->flags));
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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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#ifndef PARSEKERNEL
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msyslog(LOG_ERR, "parse: convert_rawdcf: parity check FAILED for \"%s\"\n", buffer);
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#endif
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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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* raw dcf input routine - needs to fix up 50 baud
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* characters for 1/0 decision
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*/
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static u_long
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cvt_rawdcf(
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unsigned char *buffer,
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int size,
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struct format *param,
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clocktime_t *clock_time,
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void *local
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)
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{
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last_tcode_t *t = (last_tcode_t *)local;
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register unsigned char *s = (unsigned char *)buffer;
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register unsigned char *e = s + size;
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register unsigned char *b = dcfparameter.onebits;
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register unsigned char *c = dcfparameter.zerobits;
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u_long 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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for (i = 0; i < BITS; i++)
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{
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histbuf[i] = 0;
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}
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cutoff = 0;
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lowmax = 0;
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while (s < e)
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{
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register unsigned int ch = *s ^ 0xFF;
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/*
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* these lines are left as an excercise to the reader 8-)
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*/
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if (!((ch+1) & ch) || !*s)
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{
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for (i = 0; ch; i++)
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{
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ch >>= 1;
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}
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*s = i;
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histbuf[i]++;
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cutoff += i;
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lowmax++;
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}
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else
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{
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parseprintf(DD_RAWDCF,("parse: cvt_rawdcf: character check for 0x%x@%d FAILED\n", *s, (int)(s - (unsigned char *)buffer)));
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*s = (unsigned char)~0;
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rtc = CVT_FAIL|CVT_BADFMT;
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}
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s++;
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}
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if (lowmax)
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{
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cutoff /= lowmax;
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}
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else
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{
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cutoff = 4; /* doesn't really matter - it'll fail anyway, but gives error output */
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}
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parseprintf(DD_RAWDCF,("parse: cvt_rawdcf: average bit count: %d\n", cutoff));
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lowmax = 0;
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highmax = 0;
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parseprintf(DD_RAWDCF,("parse: cvt_rawdcf: histogram:"));
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for (i = 0; i <= cutoff; i++)
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{
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lowmax+=histbuf[i] * i;
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highmax += histbuf[i];
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parseprintf(DD_RAWDCF,(" %d", histbuf[i]));
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}
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parseprintf(DD_RAWDCF, (" <M>"));
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lowmax += highmax / 2;
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if (highmax)
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{
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lowmax /= highmax;
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}
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else
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{
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lowmax = 0;
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}
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highmax = 0;
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cutoff = 0;
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for (; i < BITS; i++)
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{
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highmax+=histbuf[i] * i;
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cutoff +=histbuf[i];
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parseprintf(DD_RAWDCF,(" %d", histbuf[i]));
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}
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parseprintf(DD_RAWDCF,("\n"));
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if (cutoff)
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{
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highmax /= cutoff;
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}
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else
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{
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highmax = BITS-1;
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}
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span = cutoff = lowmax;
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for (i = lowmax; i <= highmax; i++)
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{
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if (histbuf[cutoff] > histbuf[i])
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{
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cutoff = i;
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span = i;
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}
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else
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if (histbuf[cutoff] == histbuf[i])
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{
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span = i;
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}
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}
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cutoff = (cutoff + span) / 2;
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parseprintf(DD_RAWDCF,("parse: cvt_rawdcf: lower maximum %d, higher maximum %d, cutoff %d\n", lowmax, highmax, cutoff));
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s = (unsigned char *)buffer;
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while ((s < e) && *c && *b)
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{
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if (*s == (unsigned char)~0)
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{
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*s = '?';
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}
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else
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{
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*s = (*s >= cutoff) ? *b : *c;
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}
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s++;
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b++;
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c++;
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}
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if (rtc == CVT_NONE)
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{
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rtc = convert_rawdcf(buffer, size, &dcfparameter, clock_time);
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if (rtc == CVT_OK)
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{
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time_t newtime;
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newtime = parse_to_unixtime(clock_time, &rtc);
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if ((rtc == CVT_OK) && t)
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{
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if ((newtime - t->tcode) == 60) /* guard against multi bit errors */
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{
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clock_time->utctime = newtime;
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}
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else
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{
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rtc = CVT_FAIL|CVT_BADTIME;
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}
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t->tcode = newtime;
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}
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}
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}
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return rtc;
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}
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/*
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* pps_rawdcf
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*
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* currently a very stupid version - should be extended to decode
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* also ones and zeros (which is easy)
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*/
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/*ARGSUSED*/
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static u_long
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pps_rawdcf(
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register parse_t *parseio,
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register int status,
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register timestamp_t *ptime
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)
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{
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if (!status) /* negative edge for simpler wiring (Rx->DCD) */
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{
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parseio->parse_dtime.parse_ptime = *ptime;
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parseio->parse_dtime.parse_state |= PARSEB_PPS|PARSEB_S_PPS;
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}
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return CVT_NONE;
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}
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static u_long
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snt_rawdcf(
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register parse_t *parseio,
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register timestamp_t *ptime
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)
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{
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if ((parseio->parse_dtime.parse_status & CVT_MASK) == CVT_OK)
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{
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parseio->parse_dtime.parse_stime = *ptime;
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#ifdef PARSEKERNEL
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parseio->parse_dtime.parse_time.tv.tv_sec++;
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#else
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parseio->parse_dtime.parse_time.fp.l_ui++;
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#endif
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parseprintf(DD_RAWDCF,("parse: snt_rawdcf: time stamp synthesized offset %d seconds\n", parseio->parse_index - 1));
|
|
|
|
return updatetimeinfo(parseio, parseio->parse_lstate);
|
|
}
|
|
return CVT_NONE;
|
|
}
|
|
|
|
/*
|
|
* inp_rawdcf
|
|
*
|
|
* grep DCF77 data from input stream
|
|
*/
|
|
static u_long
|
|
inp_rawdcf(
|
|
parse_t *parseio,
|
|
unsigned int ch,
|
|
timestamp_t *tstamp
|
|
)
|
|
{
|
|
static struct timeval timeout = { 1, 500000 }; /* 1.5 secongs denote second #60 */
|
|
|
|
parseprintf(DD_PARSE, ("inp_rawdcf(0x%lx, 0x%x, ...)\n", (long)parseio, ch));
|
|
|
|
parseio->parse_dtime.parse_stime = *tstamp; /* collect timestamp */
|
|
|
|
if (parse_timedout(parseio, tstamp, &timeout))
|
|
{
|
|
parseprintf(DD_PARSE, ("inp_rawdcf: time out seen\n"));
|
|
|
|
(void) parse_end(parseio);
|
|
(void) parse_addchar(parseio, ch);
|
|
return PARSE_INP_TIME;
|
|
}
|
|
else
|
|
{
|
|
unsigned int rtc;
|
|
|
|
rtc = parse_addchar(parseio, ch);
|
|
if (rtc == PARSE_INP_SKIP)
|
|
{
|
|
if (snt_rawdcf(parseio, tstamp) == CVT_OK)
|
|
return PARSE_INP_SYNTH;
|
|
}
|
|
return rtc;
|
|
}
|
|
}
|
|
|
|
#else /* not (REFCLOCK && CLOCK_PARSE && CLOCK_RAWDCF) */
|
|
int clk_rawdcf_bs;
|
|
#endif /* not (REFCLOCK && CLOCK_PARSE && CLOCK_RAWDCF) */
|
|
|
|
/*
|
|
* History:
|
|
*
|
|
* clk_rawdcf.c,v
|
|
* Revision 4.9 1999/12/06 13:42:23 kardel
|
|
* transfer correctly converted time codes always into tcode
|
|
*
|
|
* Revision 4.8 1999/11/28 09:13:50 kardel
|
|
* RECON_4_0_98F
|
|
*
|
|
* Revision 4.7 1999/04/01 20:07:20 kardel
|
|
* added checking for minutie increment of timestamps in clk_rawdcf.c
|
|
*
|
|
* Revision 4.6 1998/06/14 21:09:37 kardel
|
|
* Sun acc cleanup
|
|
*
|
|
* Revision 4.5 1998/06/13 12:04:16 kardel
|
|
* fix SYSV clock name clash
|
|
*
|
|
* Revision 4.4 1998/06/12 15:22:28 kardel
|
|
* fix prototypes
|
|
*
|
|
* Revision 4.3 1998/06/06 18:33:36 kardel
|
|
* simplified condidional compile expression
|
|
*
|
|
* Revision 4.2 1998/05/24 11:04:18 kardel
|
|
* triggering PPS on negative edge for simpler wiring (Rx->DCD)
|
|
*
|
|
* Revision 4.1 1998/05/24 09:39:53 kardel
|
|
* implementation of the new IO handling model
|
|
*
|
|
* Revision 4.0 1998/04/10 19:45:30 kardel
|
|
* Start 4.0 release version numbering
|
|
*
|
|
* from V3 3.24 log info deleted 1998/04/11 kardel
|
|
*
|
|
*/
|