445 lines
18 KiB
C
445 lines
18 KiB
C
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/**
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* \file dcftime.c
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* \brief Decoder for DCF-77 time signals
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* \author Ronald Schaten & Thomas Stegemann
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* \version $Id: dcftime.c,v 1.1 2007/01/02 21:30:40 rschaten Exp $
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*
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* License: See documentation.
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*/
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#include "boole.h"
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#include "dcftime.h"
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// TODO: define and use meaningful states for certain situations (valid time, no values received, etc.)
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// TODO: find correct start of the seconds. ATM the clock is running late by one second
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// TODO: check if it is possible to give DCF_RATE as parameter for init()
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typedef unsigned int dcf_sample; /**< number of the current sample */
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typedef unsigned int dcf_sizetype; /**< used for the size of a month */
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const dcf_sample dcf_second_samples = (DCF_RATE); /**< number of samples per second */
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/** dcf signal between 30ms and 130ms => dcf logic false (lower value) */
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const dcf_sample dcf_logic_false_min = (DCF_RATE)*3/100;
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/** dcf signal between 30ms and 130ms => dcf logic false (upper value) */
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const dcf_sample dcf_logic_false_max = (DCF_RATE)*13/100;
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/** dcf signal between 140ms and 230ms => dcf logic true (lower value) */
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const dcf_sample dcf_logic_true_min = (DCF_RATE)*14/100;
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/** dcf signal between 140ms and 230ms => dcf logic true (upper value) */
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const dcf_sample dcf_logic_true_max = (DCF_RATE)*23/100;
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/** duration between begin of dcf second (== begin of signal), should be 1 * second +/- 3% (lower value) */
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const dcf_sample dcf_second_tolerance_min = (DCF_RATE) - (DCF_RATE)*3/100;
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/** duration between begin of dcf second (== begin of signal), should be 1 * second +/- 3% (upper value) */
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const dcf_sample dcf_second_tolerance_max = (DCF_RATE) + (DCF_RATE)*3/100;
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/** definition of logical signal states */
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enum dcf_logic_signal_enum {
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dcf_signal_no, /**< no signal */
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dcf_signal_false, /**< 'false' signal */
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dcf_signal_true, /**< 'true' signal */
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dcf_signal_invalid /**< invalid signal */
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};
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/** definition of logical signal states */
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typedef enum dcf_logic_signal_enum dcf_logic_signal;
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/** format of the received data, filled during reception */
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struct dcf_receiving_data_struct {
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dcf_date date; /**< date */
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dcf_time time; /**< time */
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boolean parity; /**< parity of the received data */
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boolean is_valid; /**< data is valid */
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dcf_logic_signal current_signal; /**< logical state of the received data */
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dcf_sample low_samples; /**< counts low signal samples per second */
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dcf_sample high_samples; /**< counts high signal samples per second */
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};
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/** definition of the received data, filled during reception */
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typedef struct dcf_receiving_data_struct dcf_receiving_data;
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/** format of the DCF data.
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* dcf_current_datetime() and dcf_sample() may be called from different contexts. To avoid changing the current_datetime while it is read:
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* if use_first_current_datetime is true: dcf_current_datetime reads current_datetime[0] and dcf_sample changes current_datetime[1]
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* if use_first_current_datetime is false: vice versa
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*/
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struct dcf_data_struct {
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dcf_datetime current_datetime[2]; /**< two full datasets */
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boolean use_first_current_datetime; /**< flag if the first or the second dataset is used */
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dcf_sample current_datetime_sample; /**< number of the current sample */
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dcf_receiving_data receiving_data; /**< data being filled */
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};
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/*
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global data
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*/
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static struct dcf_data_struct dcf_data; /**< full set of received dcf data */
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/*
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dcf_time
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*/
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/**
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* Initialize a dcf_time value.
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* \param pTime: pointer to a dcf_time variable
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*/
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static void dcf_time_init(dcf_time * pTime) {
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pTime->second = 0;
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pTime->minute = 0;
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pTime->hour = 0;
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pTime->is_dst = False;
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}
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/**
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* Increment a time-value by one second.
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* \param pTime: pointer to a dcf_time variable
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* \return True if the date has to be incremented, too. Otherwise False.
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*/
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static boolean dcf_time_inc(dcf_time * pTime) {
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++(pTime->second);
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if (pTime->second == 60) {
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pTime->second = 0;
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++(pTime->minute);
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if (pTime->minute == 60) {
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pTime->minute = 0;
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++(pTime->hour);
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if (pTime->hour == 24) {
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pTime->hour = 0;
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return True; /* overflow => increment date */
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}
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}
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}
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return False;
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}
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/**
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* Check if a time-value makes sense.
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* \param pTime: pointer to a dcf_time variable
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* \return True if the time is logically correct. Otherwise False.
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*/
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static boolean dcf_time_is_valid(dcf_time * pTime) {
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return (pTime->second <= 60)
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&& (pTime->minute <= 60)
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&& (pTime->hour <= 24);
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}
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/*
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dcf_date
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*/
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/**
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* Initialize a dcf_date value.
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* \param pDate: pointer to a dcf_date variable
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*/
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static void dcf_date_init(dcf_date * pDate) {
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pDate->dayofweek = dcf_sunday;
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pDate->dayofmonth = 1;
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pDate->month = dcf_january;
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pDate->year = 0;
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}
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/**
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* Calculate the number of days in a month.
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* \param pDate: pointer to a dcf_time variable
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* \return The number of days in the given month.
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*/
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static dcf_sizetype dcf_date_days_in_month(dcf_date * pDate) {
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switch (pDate->month) {
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case dcf_february:
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if (pDate->year % 4 != 0)
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return 28; /* year not divisible by 4 */
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else if (pDate->year != 0)
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return 29; /* year divisible by 4 and not divisible by 100 */
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else if (((pDate->dayofmonth % 7) + 1) != pDate->dayofweek)
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return 28; /* year divisible by 100 and not divisible by 400 */
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else
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return 29; /* year divisible by 400 */
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/*
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if year is divisble by 400 (eg year 2000) the 1st february is a tuesday (== 2 (== 1+1))
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if year divided by 400 remains 100 1st February is a monday
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if year divided by 400 remains 200 1st February is a saturday
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if year divided by 400 remains 300 1st February is a thursday
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this repeats every 400 years, because 400 year are 3652425/25 day
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which is 7*521775/25, therefore divisible by 7
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which means every 400 years the day of week are the same
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! dayofmonth and dayofweek must be synchronized to get the right value
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*/
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case dcf_april:
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case dcf_june:
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case dcf_september:
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case dcf_november:
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return 30;
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default:
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return 31;
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}
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}
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/**
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* Increment a date-value by one day.
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* \param pDate: pointer to a dcf_date variable
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*/
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static void dcf_date_inc(dcf_date * pDate) {
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++(pDate->dayofweek);
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if (pDate->dayofweek == 8) {
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pDate->dayofweek = 1;
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}
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++(pDate->dayofmonth);
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if (pDate->dayofmonth == (dcf_date_days_in_month(pDate) + 1)) {
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pDate->dayofmonth = 1;
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++(pDate->month);
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if (pDate->month == 13) {
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pDate->month = 1;
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++(pDate->year);
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if (pDate->year == 100) {
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pDate->year = 0;
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}
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}
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}
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}
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/**
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* Check if a date-value makes sense.
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* \param pDate: pointer to a dcf_date variable
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* \return True if the date is logically correct. Otherwise False.
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*/
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static boolean dcf_date_is_valid(dcf_date * pDate) {
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return (1 <= pDate->dayofweek)
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&& (pDate->dayofweek <= 7)
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&& (1 <= pDate->dayofmonth)
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&& (pDate->dayofmonth <= dcf_date_days_in_month(pDate))
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&& (1 <= pDate->month)
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&& (pDate->month <= 12)
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&& (pDate->year <= 99);
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}
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/*
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dcf_datetime
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*/
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/**
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* Initialize a dcf_datetime value.
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* \param pDatetime: pointer to a dcf_datetime variable
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*/
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static void dcf_datetime_init(dcf_datetime * pDatetime) {
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pDatetime->is_valid = False;
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pDatetime->has_signal = False;
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dcf_time_init(&(pDatetime->time));
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dcf_date_init(&(pDatetime->date));
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}
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/**
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* Increment a datetime-value by one second.
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* \param pDatetime: pointer to a dcf_datetime variable
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*/
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static void dcf_datetime_inc(dcf_datetime * pDatetime) {
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if (dcf_time_inc(&(pDatetime->time))) {
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dcf_date_inc(&(pDatetime->date));
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}
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}
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/*
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dcf_receiving_data
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*/
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/**
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* Initialize a dcf_receiving_data value.
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* \param pReceive: pointer to a dcf_receiving_data variable
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*/
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static void dcf_receiving_data_init(dcf_receiving_data * pReceive) {
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pReceive->current_signal = dcf_signal_no;
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pReceive->parity = False;
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pReceive->is_valid = True;
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pReceive->low_samples = 0;
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pReceive->high_samples = 0;
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dcf_time_init(&(pReceive->time));
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dcf_date_init(&(pReceive->date));
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}
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/**
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* Calculate the time and date while the bits are received.
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* \param signal: True if the received bit is 200ms, False if the bit is 100ms.
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*/
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static void dcf_logic(boolean signal) {
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dcf_data.receiving_data.parity ^= signal;
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switch (dcf_data.receiving_data.time.second) {
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case 16: dcf_data.receiving_data.parity = True; break;
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case 17: dcf_data.receiving_data.time.is_dst = signal; break;
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case 18: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
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case 19: dcf_data.receiving_data.parity = True; break;
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case 20: if(!signal) dcf_data.receiving_data.is_valid = False; break;
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case 21: dcf_data.receiving_data.time.minute = signal ? 1 : 0; break;
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case 22: dcf_data.receiving_data.time.minute += signal ? 2 : 0; break;
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case 23: dcf_data.receiving_data.time.minute += signal ? 4 : 0; break;
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case 24: dcf_data.receiving_data.time.minute += signal ? 8 : 0; break;
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case 25: dcf_data.receiving_data.time.minute += signal ? 10 : 0; break;
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case 26: dcf_data.receiving_data.time.minute += signal ? 20 : 0; break;
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case 27: dcf_data.receiving_data.time.minute += signal ? 40 : 0; break;
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case 28: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
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case 29: dcf_data.receiving_data.time.hour = signal ? 1 : 0; break;
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case 30: dcf_data.receiving_data.time.hour += signal ? 2 : 0; break;
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case 31: dcf_data.receiving_data.time.hour += signal ? 4 : 0; break;
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case 32: dcf_data.receiving_data.time.hour += signal ? 8 : 0; break;
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case 33: dcf_data.receiving_data.time.hour += signal ? 10 : 0; break;
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case 34: dcf_data.receiving_data.time.hour += signal ? 20 : 0; break;
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case 35: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
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case 36: dcf_data.receiving_data.date.dayofmonth = signal ? 1 : 0; break;
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case 37: dcf_data.receiving_data.date.dayofmonth += signal ? 2 : 0; break;
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case 38: dcf_data.receiving_data.date.dayofmonth += signal ? 4 : 0; break;
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case 39: dcf_data.receiving_data.date.dayofmonth += signal ? 8 : 0; break;
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case 40: dcf_data.receiving_data.date.dayofmonth += signal ? 10 : 0; break;
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case 41: dcf_data.receiving_data.date.dayofmonth += signal ? 20 : 0; break;
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case 42: dcf_data.receiving_data.date.dayofweek = signal ? 1 : 0; break;
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case 43: dcf_data.receiving_data.date.dayofweek += signal ? 2 : 0; break;
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case 44: dcf_data.receiving_data.date.dayofweek += signal ? 4 : 0; break;
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case 45: dcf_data.receiving_data.date.month = signal ? 1 : 0; break;
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case 46: dcf_data.receiving_data.date.month += signal ? 2 : 0; break;
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case 47: dcf_data.receiving_data.date.month += signal ? 4 : 0; break;
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case 48: dcf_data.receiving_data.date.month += signal ? 8 : 0; break;
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case 49: dcf_data.receiving_data.date.month += signal ? 10 : 0; break;
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case 50: dcf_data.receiving_data.date.year = signal ? 1 : 0; break;
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case 51: dcf_data.receiving_data.date.year += signal ? 2 : 0; break;
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case 52: dcf_data.receiving_data.date.year += signal ? 4 : 0; break;
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case 53: dcf_data.receiving_data.date.year += signal ? 8 : 0; break;
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case 54: dcf_data.receiving_data.date.year += signal ? 10 : 0; break;
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case 55: dcf_data.receiving_data.date.year += signal ? 20 : 0; break;
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case 56: dcf_data.receiving_data.date.year += signal ? 40 : 0; break;
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case 57: dcf_data.receiving_data.date.year += signal ? 80 : 0; break;
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case 58: if(dcf_data.receiving_data.parity) dcf_data.receiving_data.is_valid = False; break;
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}
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++(dcf_data.receiving_data.time.second);
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}
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/**
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* Copy the values from receiving_data to current_datetime.
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*/
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static void dcf_store(void) {
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if ((dcf_data.receiving_data.is_valid)
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&& dcf_time_is_valid(&(dcf_data.receiving_data.time))
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&& dcf_date_is_valid(&(dcf_data.receiving_data.date))) {
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dcf_data.current_datetime_sample = 0;
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if (dcf_data.use_first_current_datetime) {
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dcf_data.current_datetime[1].time = dcf_data.receiving_data.time;
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dcf_data.current_datetime[1].date = dcf_data.receiving_data.date;
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dcf_data.current_datetime[1].is_valid = True;
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dcf_data.use_first_current_datetime = False;
|
||
|
|
} else {
|
||
|
|
dcf_data.current_datetime[0].time = dcf_data.receiving_data.time;
|
||
|
|
dcf_data.current_datetime[0].date = dcf_data.receiving_data.date;
|
||
|
|
dcf_data.current_datetime[0].is_valid = True;
|
||
|
|
dcf_data.use_first_current_datetime = True;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Copy valid time and increment it.
|
||
|
|
*/
|
||
|
|
static void dcf_inc(void) {
|
||
|
|
if (dcf_data.use_first_current_datetime) {
|
||
|
|
dcf_data.current_datetime[1] = dcf_data.current_datetime[0];
|
||
|
|
dcf_datetime_inc(&(dcf_data.current_datetime[1]));
|
||
|
|
dcf_data.use_first_current_datetime = False;
|
||
|
|
} else {
|
||
|
|
dcf_data.current_datetime[0] = dcf_data.current_datetime[1];
|
||
|
|
dcf_datetime_inc(&(dcf_data.current_datetime[0]));
|
||
|
|
dcf_data.use_first_current_datetime = True;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
exported functions, documented in header file
|
||
|
|
*/
|
||
|
|
|
||
|
|
void dcf_init(void) {
|
||
|
|
dcf_data.use_first_current_datetime = True;
|
||
|
|
dcf_data.current_datetime_sample = 0;
|
||
|
|
dcf_datetime_init(&(dcf_data.current_datetime[0]));
|
||
|
|
dcf_datetime_init(&(dcf_data.current_datetime[1]));
|
||
|
|
dcf_receiving_data_init(&(dcf_data.receiving_data));
|
||
|
|
}
|
||
|
|
|
||
|
|
void dcf_signal(boolean signal) {
|
||
|
|
if (dcf_data.receiving_data.low_samples > dcf_second_samples) {
|
||
|
|
if (dcf_data.receiving_data.time.second == 59) {
|
||
|
|
dcf_data.receiving_data.time.second = 0;
|
||
|
|
dcf_store();
|
||
|
|
} else {
|
||
|
|
dcf_data.receiving_data.time.second = 0;
|
||
|
|
}
|
||
|
|
dcf_data.receiving_data.low_samples = 0;
|
||
|
|
dcf_data.receiving_data.is_valid = True;
|
||
|
|
}
|
||
|
|
/* calculate receiving date time */
|
||
|
|
if (signal) {
|
||
|
|
dcf_data.receiving_data.low_samples = 0;
|
||
|
|
++(dcf_data.receiving_data.high_samples);
|
||
|
|
} else {
|
||
|
|
++(dcf_data.receiving_data.low_samples);
|
||
|
|
if (dcf_data.receiving_data.high_samples == 0) {
|
||
|
|
} else if (dcf_data.receiving_data.high_samples < dcf_logic_false_min) {
|
||
|
|
/* too short signal */
|
||
|
|
dcf_data.receiving_data.is_valid = False;
|
||
|
|
dcf_data.receiving_data.current_signal = dcf_signal_invalid;
|
||
|
|
} else if (dcf_data.receiving_data.high_samples < dcf_logic_false_max) {
|
||
|
|
/* short signal, logic 0 */
|
||
|
|
dcf_logic(False);
|
||
|
|
dcf_data.receiving_data.current_signal = dcf_signal_false;
|
||
|
|
} else if (dcf_data.receiving_data.high_samples < dcf_logic_true_min) {
|
||
|
|
/* signal cannot be assigned to true or false */
|
||
|
|
dcf_data.receiving_data.is_valid = False;
|
||
|
|
dcf_data.receiving_data.current_signal = dcf_signal_invalid;
|
||
|
|
} else if (dcf_data.receiving_data.high_samples < dcf_logic_true_max) {
|
||
|
|
/* long signal, logic 1 */
|
||
|
|
dcf_logic(True);
|
||
|
|
dcf_data.receiving_data.current_signal = dcf_signal_true;
|
||
|
|
} else {
|
||
|
|
/* too long signal */
|
||
|
|
dcf_data.receiving_data.is_valid = False;
|
||
|
|
dcf_data.receiving_data.current_signal = dcf_signal_invalid;
|
||
|
|
}
|
||
|
|
dcf_data.receiving_data.high_samples = 0;
|
||
|
|
}
|
||
|
|
/* calculate current date time */
|
||
|
|
++(dcf_data.current_datetime_sample);
|
||
|
|
if (dcf_data.current_datetime_sample == dcf_second_samples) {
|
||
|
|
dcf_data.current_datetime_sample = 0;
|
||
|
|
dcf_inc();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
dcf_datetime dcf_current_datetime(void) {
|
||
|
|
if (dcf_data.use_first_current_datetime) {
|
||
|
|
dcf_data.current_datetime[0].has_signal = dcf_data.receiving_data.is_valid;
|
||
|
|
return dcf_data.current_datetime[0];
|
||
|
|
} else {
|
||
|
|
dcf_data.current_datetime[1].has_signal = dcf_data.receiving_data.is_valid;
|
||
|
|
return dcf_data.current_datetime[1];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const char *dcf_dayofweek_name(dcf_dayofweek dow) {
|
||
|
|
switch (dow) {
|
||
|
|
case 1:
|
||
|
|
return "Mo";
|
||
|
|
case 2:
|
||
|
|
return "Tu";
|
||
|
|
case 3:
|
||
|
|
return "We";
|
||
|
|
case 4:
|
||
|
|
return "Th";
|
||
|
|
case 5:
|
||
|
|
return "Fr";
|
||
|
|
case 6:
|
||
|
|
return "Sa";
|
||
|
|
case 7:
|
||
|
|
return "Su";
|
||
|
|
default:
|
||
|
|
return "??";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
const char *dcf_is_dst_name(dcf_is_dst dst) {
|
||
|
|
if (dst) {
|
||
|
|
return "ST";
|
||
|
|
} else {
|
||
|
|
return "WT";
|
||
|
|
}
|
||
|
|
}
|