581 lines
14 KiB
C
581 lines
14 KiB
C
#if defined(REFCLOCK) && (defined(PARSE) || defined(PARSEPPS)) && defined(CLOCK_RAWDCF)
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/*
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* /src/NTP/REPOSITORY/v3/parse/clk_rawdcf.c,v 3.16 1994/05/31 20:02:40 kardel Exp
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*
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* clk_rawdcf.c,v 3.16 1994/05/31 20:02:40 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) 1992,1993,1994
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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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*/
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#include "sys/types.h"
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#include "sys/time.h"
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#include "sys/errno.h"
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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 cvt_rawdcf();
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static u_long pps_rawdcf();
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static u_long snt_rawdcf();
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clockformat_t clock_rawdcf =
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{
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(unsigned LONG (*)())0, /* no input handling */
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cvt_rawdcf, /* raw dcf input conversion */
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(void (*)())0, /* no character bound synchronisation */
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pps_rawdcf, /* examining PPS information */
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snt_rawdcf, /* synthesize time code from input */
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(void *)0, /* buffer bit representation */
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"RAW DCF77 Timecode", /* direct decoding / time synthesis */
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61, /* bit buffer */
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SYNC_ONE|SYNC_ZERO|SYNC_TIMEOUT|SYNC_SYNTHESIZE|CVT_FIXEDONLY,
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/* catch all transitions, buffer restart on timeout, fixed configuration only */
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0, /* no private data (currently in input buffer) */
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{ 1, 500000}, /* restart after 1.5 seconds */
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'\0',
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'\0',
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'\0'
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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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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 ext_bf(buf, idx, zero)
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register char *buf;
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register int idx;
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register char *zero;
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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 pcheck(buf, idx, zero)
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register char *buf;
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register int idx;
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register char *zero;
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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] != zero[i]);
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return psum;
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}
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static u_long convert_rawdcf(buffer, size, dcfparam, clock)
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register unsigned char *buffer;
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register int size;
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register struct dcfparam *dcfparam;
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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 *b = dcfparam->onebits;
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register unsigned char *c = dcfparam->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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#ifdef PARSEKERNEL
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printf("parse: convert_rawdcf: INCOMPLETE DATA - time code only has %d bits\n", size);
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#else
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syslog(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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#ifdef PARSEKERNEL
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printf("parse: convert_rawdcf: BAD DATA - no conversion for \"%s\"\n", buffer);
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#else
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syslog(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, dcfparam->zerobits) == 1) &&
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pcheck(buffer, DCF_P_P1, dcfparam->zerobits) &&
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pcheck(buffer, DCF_P_P2, dcfparam->zerobits) &&
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pcheck(buffer, DCF_P_P3, dcfparam->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->flags = PARSEB_S_ANTENNA|PARSEB_S_LEAP;
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clock->utctime= 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, dcfparam->zerobits);
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clock->minute = TIMES10(clock->minute) + ext_bf(buffer, DCF_M1, dcfparam->zerobits);
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clock->hour = ext_bf(buffer, DCF_H10, dcfparam->zerobits);
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clock->hour = TIMES10(clock->hour) + ext_bf(buffer, DCF_H1, dcfparam->zerobits);
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clock->day = ext_bf(buffer, DCF_D10, dcfparam->zerobits);
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clock->day = TIMES10(clock->day) + ext_bf(buffer, DCF_D1, dcfparam->zerobits);
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clock->month = ext_bf(buffer, DCF_MO0, dcfparam->zerobits);
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clock->month = TIMES10(clock->month) + ext_bf(buffer, DCF_MO, dcfparam->zerobits);
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clock->year = ext_bf(buffer, DCF_Y10, dcfparam->zerobits);
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clock->year = TIMES10(clock->year) + ext_bf(buffer, DCF_Y1, dcfparam->zerobits);
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switch (ext_bf(buffer, DCF_Z, dcfparam->zerobits))
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{
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case DCF_Z_MET:
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clock->utcoffset = -1*60*60;
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break;
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case DCF_Z_MED:
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clock->flags |= PARSEB_DST;
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clock->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, dcfparam->zerobits))
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clock->flags |= PARSEB_ANNOUNCE;
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if (ext_bf(buffer, DCF_A2, dcfparam->zerobits))
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clock->flags |= PARSEB_LEAPADD; /* default: DCF77 data format deficiency */
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if (ext_bf(buffer, DCF_R, dcfparam->zerobits))
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clock->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->hour, (int)clock->minute, (int)clock->day, (int)clock->month,(int) clock->year,
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(u_long)clock->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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#ifdef PARSEKERNEL
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printf("parse: convert_rawdcf: parity check FAILED for \"%s\"\n", buffer);
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#else
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syslog(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 cvt_rawdcf(buffer, size, param, clock)
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register unsigned char *buffer;
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register int size;
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register void *param;
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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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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, s - buffer));
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*s = ~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 = 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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return (rtc == CVT_NONE) ? convert_rawdcf(buffer, size, &dcfparam, clock) : 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 pps_rawdcf(parseio, status, ptime)
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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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if (status)
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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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|
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/*ARGSUSED*/
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static u_long snt_rawdcf(parseio, ptime)
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register parse_t *parseio;
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register timestamp_t *ptime;
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{
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clocktime_t clock;
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u_long cvtrtc;
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time_t t;
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|
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/*
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* start at last sample and add second index - gross, may have to be much more careful
|
|
*/
|
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if (convert_rawdcf(parseio->parse_ldata, parseio->parse_ldsize - 1, &dcfparam, &clock) == CVT_OK)
|
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{
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if ((t = parse_to_unixtime(&clock, &cvtrtc)) == -1)
|
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{
|
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parseprintf(DD_RAWDCF,("parse: snt_rawdcf: time conversion FAILED\n"));
|
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return CVT_FAIL|cvtrtc;
|
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}
|
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}
|
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else
|
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{
|
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parseprintf(DD_RAWDCF,("parse: snt_rawdcf: data conversion FAILED\n"));
|
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return CVT_NONE;
|
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}
|
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|
|
parseio->parse_dtime.parse_stime = *ptime;
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|
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t += parseio->parse_index - 1;
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|
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/*
|
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* time stamp
|
|
*/
|
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#ifdef PARSEKERNEL
|
|
parseio->parse_dtime.parse_time.tv.tv_sec = t;
|
|
parseio->parse_dtime.parse_time.tv.tv_usec = clock.usecond;
|
|
#else
|
|
parseio->parse_dtime.parse_time.fp.l_ui = t + JAN_1970;
|
|
TVUTOTSF(clock.usecond, parseio->parse_dtime.parse_time.fp.l_uf);
|
|
#endif
|
|
|
|
parseprintf(DD_RAWDCF,("parse: snt_rawdcf: time stamp synthesized offset %d seconds\n", parseio->parse_index - 1));
|
|
|
|
return updatetimeinfo(parseio, t, clock.usecond, clock.flags);
|
|
}
|
|
#endif /* defined(PARSE) && defined(CLOCK_RAWDCF) */
|
|
|
|
/*
|
|
* History:
|
|
*
|
|
* clk_rawdcf.c,v $
|
|
* Revision 3.16 1994/05/31 20:02:40 kardel
|
|
* sync on ONE transition
|
|
*
|
|
* Revision 3.15 1994/05/30 10:20:01 kardel
|
|
* LONG cleanup
|
|
*
|
|
* Revision 3.14 1994/05/12 12:49:09 kardel
|
|
* printf fmt/arg cleanup
|
|
*
|
|
* Revision 3.13 1994/03/10 19:00:43 kardel
|
|
* clear utctime field to avoid confusion on synthesize time stamps
|
|
*
|
|
* Revision 3.12 1994/02/20 13:04:39 kardel
|
|
* parse add/delete second support
|
|
*
|
|
* Revision 3.11 1994/02/02 17:45:23 kardel
|
|
* rcs ids fixed
|
|
*
|
|
* Revision 3.9 1994/01/25 19:05:12 kardel
|
|
* 94/01/23 reconcilation
|
|
*
|
|
* Revision 3.8 1994/01/22 11:24:11 kardel
|
|
* fixed PPS handling
|
|
*
|
|
* Revision 3.7 1993/10/30 09:44:41 kardel
|
|
* conditional compilation flag cleanup
|
|
*
|
|
* Revision 3.6 1993/10/03 19:10:45 kardel
|
|
* restructured I/O handling
|
|
*
|
|
* Revision 3.5 1993/09/27 21:08:07 kardel
|
|
* utcoffset now in seconds
|
|
*
|
|
* Revision 3.4 1993/09/26 23:40:25 kardel
|
|
* new parse driver logic
|
|
*
|
|
* Revision 3.3 1993/09/01 21:44:54 kardel
|
|
* conditional cleanup
|
|
*
|
|
* Revision 3.2 1993/07/09 11:37:18 kardel
|
|
* Initial restructured version + GPS support
|
|
*
|
|
* Revision 3.1 1993/07/06 10:00:19 kardel
|
|
* DCF77 driver goes generic...
|
|
*
|
|
*/
|