/* time.h - low level time and date functions */ /* July 3 2011 - fixed elapsedSecsThisWeek macro (thanks Vincent Valdy for this) - fixed daysToTime_t macro (thanks maniacbug) */ #ifndef _Time_h #ifdef __cplusplus #define _Time_h #include #ifndef __AVR__ #include // for __time_t_defined, but avr libc lacks sys/types.h #endif #if !defined(__time_t_defined) // avoid conflict with newlib or other posix libc typedef unsigned long time_t; #endif // This ugly hack allows us to define C++ overloaded functions, when included // from within an extern "C", as newlib's sys/stat.h does. Actually it is // intended to include "time.h" from the C library (on ARM, but AVR does not // have that file at all). On Mac and Windows, the compiler will find this // "Time.h" instead of the C library "time.h", so we may cause other weird // and unpredictable effects by conflicting with the C library header "time.h", // but at least this hack lets us define C++ functions as intended. Hopefully // nothing too terrible will result from overriding the C library header?! extern "C++" { typedef enum {timeNotSet, timeNeedsSync, timeSet } timeStatus_t ; typedef enum { dowInvalid, dowSunday, dowMonday, dowTuesday, dowWednesday, dowThursday, dowFriday, dowSaturday } timeDayOfWeek_t; typedef enum { tmSecond, tmMinute, tmHour, tmWday, tmDay,tmMonth, tmYear, tmNbrFields } tmByteFields; typedef struct { uint8_t Second; uint8_t Minute; uint8_t Hour; uint8_t Wday; // day of week, sunday is day 1 uint8_t Day; uint8_t Month; uint8_t Year; // offset from 1970; } tmElements_t, TimeElements, *tmElementsPtr_t; //convenience macros to convert to and from tm years #define tmYearToCalendar(Y) ((Y) + 1970) // full four digit year #define CalendarYrToTm(Y) ((Y) - 1970) #define tmYearToY2k(Y) ((Y) - 30) // offset is from 2000 #define y2kYearToTm(Y) ((Y) + 30) typedef time_t(*getExternalTime)(); //typedef void (*setExternalTime)(const time_t); // not used in this version /*==============================================================================*/ /* Useful Constants */ #define SECS_PER_MIN ((time_t)(60UL)) #define SECS_PER_HOUR ((time_t)(3600UL)) #define SECS_PER_DAY ((time_t)(SECS_PER_HOUR * 24UL)) #define DAYS_PER_WEEK ((time_t)(7UL)) #define SECS_PER_WEEK ((time_t)(SECS_PER_DAY * DAYS_PER_WEEK)) #define SECS_PER_YEAR ((time_t)(SECS_PER_DAY * 365UL)) // TODO: ought to handle leap years #define SECS_YR_2000 ((time_t)(946684800UL)) // the time at the start of y2k /* Useful Macros for getting elapsed time */ #define numberOfSeconds(_time_) ((_time_) % SECS_PER_MIN) #define numberOfMinutes(_time_) (((_time_) / SECS_PER_MIN) % SECS_PER_MIN) #define numberOfHours(_time_) (((_time_) % SECS_PER_DAY) / SECS_PER_HOUR) #define dayOfWeek(_time_) ((((_time_) / SECS_PER_DAY + 4) % DAYS_PER_WEEK)+1) // 1 = Sunday #define elapsedDays(_time_) ((_time_) / SECS_PER_DAY) // this is number of days since Jan 1 1970 #define elapsedSecsToday(_time_) ((_time_) % SECS_PER_DAY) // the number of seconds since last midnight // The following macros are used in calculating alarms and assume the clock is set to a date later than Jan 1 1971 // Always set the correct time before settting alarms #define previousMidnight(_time_) (((_time_) / SECS_PER_DAY) * SECS_PER_DAY) // time at the start of the given day #define nextMidnight(_time_) (previousMidnight(_time_) + SECS_PER_DAY) // time at the end of the given day #define elapsedSecsThisWeek(_time_) (elapsedSecsToday(_time_) + ((dayOfWeek(_time_)-1) * SECS_PER_DAY)) // note that week starts on day 1 #define previousSunday(_time_) ((_time_) - elapsedSecsThisWeek(_time_)) // time at the start of the week for the given time #define nextSunday(_time_) (previousSunday(_time_)+SECS_PER_WEEK) // time at the end of the week for the given time /* Useful Macros for converting elapsed time to a time_t */ #define minutesToTime_t ((M)) ( (M) * SECS_PER_MIN) #define hoursToTime_t ((H)) ( (H) * SECS_PER_HOUR) #define daysToTime_t ((D)) ( (D) * SECS_PER_DAY) // fixed on Jul 22 2011 #define weeksToTime_t ((W)) ( (W) * SECS_PER_WEEK) /*============================================================================*/ /* time and date functions */ int hour(); // the hour now int hour(time_t t); // the hour for the given time int hourFormat12(); // the hour now in 12 hour format int hourFormat12(time_t t); // the hour for the given time in 12 hour format uint8_t isAM(); // returns true if time now is AM uint8_t isAM(time_t t); // returns true the given time is AM uint8_t isPM(); // returns true if time now is PM uint8_t isPM(time_t t); // returns true the given time is PM int minute(); // the minute now int minute(time_t t); // the minute for the given time int second(); // the second now int second(time_t t); // the second for the given time int day(); // the day now int day(time_t t); // the day for the given time int weekday(); // the weekday now (Sunday is day 1) int weekday(time_t t); // the weekday for the given time int month(); // the month now (Jan is month 1) int month(time_t t); // the month for the given time int year(); // the full four digit year: (2009, 2010 etc) int year(time_t t); // the year for the given time time_t now(); // return the current time as seconds since Jan 1 1970 void setTime(time_t t); void setTime(int hr,int min,int sec,int day, int month, int yr); void adjustTime(long adjustment); /* date strings */ #define dt_MAX_STRING_LEN 9 // length of longest date string (excluding terminating null) char* monthStr(uint8_t month); char* dayStr(uint8_t day); char* monthShortStr(uint8_t month); char* dayShortStr(uint8_t day); /* time sync functions */ timeStatus_t timeStatus(); // indicates if time has been set and recently synchronized void setSyncProvider( getExternalTime getTimeFunction); // identify the external time provider void setSyncInterval(time_t interval); // set the number of seconds between re-sync /* low level functions to convert to and from system time */ void breakTime(time_t time, tmElements_t &tm); // break time_t into elements time_t makeTime(const tmElements_t &tm); // convert time elements into time_t } // extern "C++" #endif // __cplusplus #endif /* _Time_h */