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/*
* Schmid clock support
* based on information and testing from Adam W. Feigin et. al (Swisstime iis.ethz.ch)
*
* Copyright Frank Kardel <kardel@ntp.org>
* Copyright the NTPsec project contributors
* SPDX-License-Identifier: BSD-3-Clause
*/
#include "config.h"
#include "ntp_fp.h"
#include "ntp_calendar.h"
#include "parse.h"
#include "ntp_stdlib.h"
#include <stdio.h>
/*
* Description courtesy of Adam W. Feigin et. al (Swisstime iis.ethz.ch)
*
* The command to Schmid's DCF77 clock is a single byte; each bit
* allows the user to select some part of the time string, as follows (the
* output for the lsb is sent first).
*
* Bit 0: time in MEZ, 4 bytes *binary, not BCD*; hh.mm.ss.tenths
* Bit 1: date 3 bytes *binary, not BCD: dd.mm.yy
* Bit 2: week day, 1 byte (unused here)
* Bit 3: time zone, 1 byte, 0=MET, 1=MEST. (unused here)
* Bit 4: clock status, 1 byte, 0=time invalid,
* 1=time from crystal backup,
* 3=time from DCF77
* Bit 5: transmitter status, 1 byte,
* bit 0: backup antenna
* bit 1: time zone change within 1h
* bit 3,2: TZ 01=MEST, 10=MET
* bit 4: leap second will be
* added within one hour
* bits 5-7: Zero
* Bit 6: time in backup mode, units of 5 minutes (unused here)
*
*/
#define WS_TIME 0x01
#define WS_SIGNAL 0x02
#define WS_CALLBIT 0x01 /* "call bit" used to signalize irregularities in the control facilities */
#define WS_ANNOUNCE 0x02
#define WS_TZ 0x0c
#define WS_MET 0x08
#define WS_MEST 0x04
#define WS_LEAP 0x10
static parse_cvt_fnc_t cvt_schmid;
static parse_inp_fnc_t inp_schmid;
clockformat_t clock_schmid = {
inp_schmid, /* no input handling */
cvt_schmid, /* Schmid conversion */
0, /* not direct PPS monitoring */
0, /* conversion configuration */
"Schmid", /* Schmid receiver */
12, /* binary data buffer */
0, /* no private data (complete messages) */
};
/* parse_cvt_fnc_t */
static unsigned long
cvt_schmid(
unsigned char *buffer,
int size,
struct format *format,
clocktime_t *clock_time,
void *local
)
{
UNUSED_ARG(format);
UNUSED_ARG(local);
if ((size != 11) || (buffer[10] != (unsigned char)'\375')) {
return CVT_NONE;
} else {
if (buffer[0] > 23 || buffer[1] > 59 || buffer[2] > 59 || buffer[3] > 9) /* Time */ {
return CVT_FAIL|CVT_BADTIME;
} else if (buffer[4] < 1 || buffer[4] > 31 || buffer[5] < 1 || buffer[5] > 12 || buffer[6] > 99) {
return CVT_FAIL|CVT_BADDATE;
} else {
clock_time->hour = buffer[0];
clock_time->minute = buffer[1];
clock_time->second = buffer[2];
clock_time->usecond = buffer[3] * 100000;
clock_time->day = buffer[4];
clock_time->month = buffer[5];
clock_time->year = buffer[6];
clock_time->flags = 0;
switch (buffer[8] & WS_TZ) {
case WS_MET:
clock_time->utcoffset = -1*60*60;
break;
case WS_MEST:
clock_time->utcoffset = -2*60*60;
clock_time->flags |= PARSEB_DST;
break;
default:
return CVT_FAIL|CVT_BADFMT;
}
if (!(buffer[7] & WS_TIME)) {
clock_time->flags |= PARSEB_POWERUP;
}
if (!(buffer[7] & WS_SIGNAL)) {
clock_time->flags |= PARSEB_NOSYNC;
}
if (buffer[7] & WS_SIGNAL) {
if (buffer[8] & WS_CALLBIT) {
clock_time->flags |= PARSEB_CALLBIT;
}
if (buffer[8] & WS_ANNOUNCE) {
clock_time->flags |= PARSEB_ANNOUNCE;
}
if (buffer[8] & WS_LEAP) {
clock_time->flags |= PARSEB_LEAPADD; /* default: DCF77 data format deficiency */
}
}
clock_time->flags |= PARSEB_S_LEAP|PARSEB_S_CALLBIT;
return CVT_OK;
}
}
}
/*
* parse_inp_fnc_t inp_schmid
*
* grab data from input stream
*/
static unsigned long
inp_schmid(
parse_t *parseio,
char ch,
timestamp_t *tstamp
)
{
unsigned int rtc;
UNUSED_ARG(tstamp);
parseprintf(DD_PARSE, ("inp_schmid(0x%lx, 0x%x, ...)\n",
(unsigned long)parseio, (unsigned)ch));
switch ((uint8_t)ch) {
case 0xFD: /* */
parseprintf(DD_PARSE, ("inp_schmid: 0xFD seen\n"));
if ((rtc = parse_addchar(parseio, ch)) == PARSE_INP_SKIP) {
return parse_end(parseio);
} else {
return rtc;
}
default:
return parse_addchar(parseio, ch);
}
}
/*
* History:
*
* clk_schmid.c,v
* Revision 4.9 2005/04/16 17:32:10 kardel
* update copyright
*
* Revision 4.8 2004/11/14 15:29:41 kardel
* support PPSAPI, upgrade Copyright to Berkeley style
*
* Revision 4.5 1999/11/28 09:13:51 kardel
* RECON_4_0_98F
*
* Revision 4.4 1998/06/13 12:06:03 kardel
* fix SYSV clock name clash
*
* Revision 4.3 1998/06/12 15:22:29 kardel
* fix prototypes
*
* Revision 4.2 1998/06/12 09:13:26 kardel
* conditional compile macros fixed
* printf prototype
*
* Revision 4.1 1998/05/24 09:39:53 kardel
* implementation of the new IO handling model
*
* Revision 4.0 1998/04/10 19:45:31 kardel
* Start 4.0 release version numbering
*
* from V3 3.22 log info deleted 1998/04/11 kardel
*/
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