Andrew Boyson / Mbed 2 deprecated iot

Backing up an unused program in case of future need

Dependencies:   mbed

time.cpp@8:45a0205a298f, 2018-12-06 (annotated)

Committer:
andrewboyson
Date:
Thu Dec 06 11:40:19 2018 +0000
Revision:
8:45a0205a298f
Parent:
7:024ace6d943c 
Backing up

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 0:09f915e6f9f6 1 #include "mbed.h"
andrewboyson 0:09f915e6f9f6 2 #define ONE_MILLION 1000000
andrewboyson 0:09f915e6f9f6 3
andrewboyson 6:be97d38e0b01 4 static Ticker ticker;
andrewboyson 6:be97d38e0b01 5 static volatile uint64_t unixTime16ths;
andrewboyson 0:09f915e6f9f6 6 static void tick(void)
andrewboyson 0:09f915e6f9f6 7 {
andrewboyson 0:09f915e6f9f6 8 unixTime16ths++;
andrewboyson 0:09f915e6f9f6 9 }
andrewboyson 0:09f915e6f9f6 10 void TimeSet(uint32_t t)
andrewboyson 0:09f915e6f9f6 11 {
andrewboyson 0:09f915e6f9f6 12 unixTime16ths = (uint64_t)t << 4;
andrewboyson 0:09f915e6f9f6 13 }
andrewboyson 0:09f915e6f9f6 14 uint32_t TimeGet()
andrewboyson 0:09f915e6f9f6 15 {
andrewboyson 0:09f915e6f9f6 16 return unixTime16ths >> 4;
andrewboyson 0:09f915e6f9f6 17 }
andrewboyson 0:09f915e6f9f6 18 void TimeSet16ths(uint64_t t)
andrewboyson 0:09f915e6f9f6 19 {
andrewboyson 0:09f915e6f9f6 20 unixTime16ths = t;
andrewboyson 0:09f915e6f9f6 21 }
andrewboyson 0:09f915e6f9f6 22 uint64_t TimeGet16ths()
andrewboyson 0:09f915e6f9f6 23 {
andrewboyson 0:09f915e6f9f6 24 return unixTime16ths;
andrewboyson 6:be97d38e0b01 25 }
andrewboyson 7:024ace6d943c 26 void TimeToTm(uint32_t time, struct tm* ptm)
andrewboyson 7:024ace6d943c 27 {
andrewboyson 7:024ace6d943c 28 int seconds = time % 60; time /= 60;
andrewboyson 7:024ace6d943c 29 int minutes = time % 60; time /= 60;
andrewboyson 7:024ace6d943c 30 int hours = time % 24; time /= 24;
andrewboyson 7:024ace6d943c 31 int daysLeft = time;
andrewboyson 7:024ace6d943c 32
andrewboyson 7:024ace6d943c 33 //Add a year at a time while there is more than a year of days left
andrewboyson 7:024ace6d943c 34 int year = 1970; //Unix epoch is 1970
andrewboyson 7:024ace6d943c 35 int dayOfWeek = 4; //1 Jan 1970 is a Thursday
andrewboyson 7:024ace6d943c 36 int leapYear;
andrewboyson 7:024ace6d943c 37 while(1)
andrewboyson 7:024ace6d943c 38 {
andrewboyson 7:024ace6d943c 39 //See if it is a leap year
andrewboyson 8:45a0205a298f 40 leapYear = false;
andrewboyson 8:45a0205a298f 41 if (year % 4 == 0) leapYear = true;
andrewboyson 8:45a0205a298f 42 if (year % 100 == 0) leapYear = false;
andrewboyson 8:45a0205a298f 43 if (year % 400 == 0) leapYear = true;
andrewboyson 7:024ace6d943c 44
andrewboyson 7:024ace6d943c 45 //Find the number of days in this year
andrewboyson 7:024ace6d943c 46 int daysInYear = leapYear ? 366 : 365;
andrewboyson 7:024ace6d943c 47
andrewboyson 7:024ace6d943c 48 //Stop if this is the final year
andrewboyson 7:024ace6d943c 49 if (daysLeft < daysInYear) break;
andrewboyson 7:024ace6d943c 50
andrewboyson 7:024ace6d943c 51 //Calculate the current day of the week at the start of the year
andrewboyson 7:024ace6d943c 52 dayOfWeek += leapYear ? 2 : 1;
andrewboyson 7:024ace6d943c 53 if (dayOfWeek >= 7) dayOfWeek -= 7;
andrewboyson 7:024ace6d943c 54
andrewboyson 7:024ace6d943c 55 //Move on to the next year
andrewboyson 7:024ace6d943c 56 daysLeft -= daysInYear;
andrewboyson 7:024ace6d943c 57 year++;
andrewboyson 7:024ace6d943c 58 }
andrewboyson 7:024ace6d943c 59
andrewboyson 8:45a0205a298f 60 //Days left contains the days left from the start (1 Jan) of the current year
andrewboyson 8:45a0205a298f 61 int dayOfYear = daysLeft + 1;
andrewboyson 7:024ace6d943c 62 dayOfWeek += daysLeft;
andrewboyson 7:024ace6d943c 63 dayOfWeek %= 7;
andrewboyson 7:024ace6d943c 64
andrewboyson 7:024ace6d943c 65 //Add a month at a time while there is more than a month of days left
andrewboyson 8:45a0205a298f 66 static char monthlengths[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
andrewboyson 8:45a0205a298f 67 int month = 1;
andrewboyson 7:024ace6d943c 68 while(1)
andrewboyson 7:024ace6d943c 69 {
andrewboyson 8:45a0205a298f 70 int daysInMonth = monthlengths[month-1];
andrewboyson 8:45a0205a298f 71 if (month == 2 && leapYear) daysInMonth++;
andrewboyson 7:024ace6d943c 72
andrewboyson 7:024ace6d943c 73 //Stop if this is the last month
andrewboyson 7:024ace6d943c 74 if (daysLeft < daysInMonth) break;
andrewboyson 7:024ace6d943c 75
andrewboyson 7:024ace6d943c 76 //Move onto next month
andrewboyson 7:024ace6d943c 77 daysLeft -= daysInMonth;
andrewboyson 7:024ace6d943c 78 month++;
andrewboyson 7:024ace6d943c 79 }
andrewboyson 8:45a0205a298f 80
andrewboyson 8:45a0205a298f 81 //Days left contains the days left from the start (1st) of the current month
andrewboyson 8:45a0205a298f 82 int dayOfMonth = daysLeft + 1;
andrewboyson 8:45a0205a298f 83
andrewboyson 8:45a0205a298f 84 //Find the last Sunday in the month
andrewboyson 8:45a0205a298f 85 int lastSunday = monthlengths[month-1];
andrewboyson 8:45a0205a298f 86 while (lastSunday > 0)
andrewboyson 8:45a0205a298f 87 {
andrewboyson 8:45a0205a298f 88 int weekday = (dayOfWeek + lastSunday - dayOfMonth) % 7;
andrewboyson 8:45a0205a298f 89 if (weekday == 0) break; //Stop when weekday is Sunday
andrewboyson 8:45a0205a298f 90 lastSunday--;
andrewboyson 8:45a0205a298f 91 }
andrewboyson 8:45a0205a298f 92
andrewboyson 8:45a0205a298f 93 //Work out if Daylight Saving Time applies
andrewboyson 8:45a0205a298f 94 int dst;
andrewboyson 8:45a0205a298f 95 if (month <= 2) dst = false; //Jan, Feb
andrewboyson 8:45a0205a298f 96 if (month == 3) //Mar - DST true after 1am UTC on the last Sunday in March
andrewboyson 8:45a0205a298f 97 {
andrewboyson 8:45a0205a298f 98 if (dayOfMonth < lastSunday) dst = false;
andrewboyson 8:45a0205a298f 99 if (dayOfMonth == lastSunday) dst = hours >= 1;
andrewboyson 8:45a0205a298f 100 if (dayOfMonth > lastSunday) dst = true;
andrewboyson 8:45a0205a298f 101 }
andrewboyson 8:45a0205a298f 102 if (month >= 4 && month <= 9) dst = true; //Apr, May, Jun, Jul, Aug, Sep
andrewboyson 8:45a0205a298f 103 if (month == 10) //Oct - DST false after 1am UTC on the last Sunday in October
andrewboyson 8:45a0205a298f 104 {
andrewboyson 8:45a0205a298f 105 if (dayOfMonth < lastSunday) dst = true;
andrewboyson 8:45a0205a298f 106 if (dayOfMonth == lastSunday) dst = hours < 1;
andrewboyson 8:45a0205a298f 107 if (dayOfMonth > lastSunday) dst = false;
andrewboyson 8:45a0205a298f 108 }
andrewboyson 8:45a0205a298f 109 if (month >= 11) dst = false; //Nov, Dec
andrewboyson 8:45a0205a298f 110
andrewboyson 8:45a0205a298f 111
andrewboyson 8:45a0205a298f 112 //Set up the broken time TM structure
andrewboyson 8:45a0205a298f 113 ptm->tm_sec = seconds; // 00 --> 59
andrewboyson 8:45a0205a298f 114 ptm->tm_min = minutes; // 00 --> 59
andrewboyson 8:45a0205a298f 115 ptm->tm_hour = hours; // 00 --> 23
andrewboyson 8:45a0205a298f 116 ptm->tm_mday = dayOfMonth; // 01 --> 31
andrewboyson 8:45a0205a298f 117 ptm->tm_mon = month - 1; // 00 --> 11
andrewboyson 8:45a0205a298f 118 ptm->tm_year = year - 1900; // Years since 1900
andrewboyson 8:45a0205a298f 119 ptm->tm_wday = dayOfWeek; // 0 --> 6 where 0 == Sunday
andrewboyson 8:45a0205a298f 120 ptm->tm_yday = dayOfYear - 1; // 0 --> 365
andrewboyson 8:45a0205a298f 121 ptm->tm_isdst = dst; // +ve if DST, 0 if not DSTime, -ve if the information is not available. Note that 'true' evaluates to +1.
andrewboyson 8:45a0205a298f 122
andrewboyson 7:024ace6d943c 123 }
andrewboyson 7:024ace6d943c 124 void TimeGetTm(struct tm* ptm)
andrewboyson 7:024ace6d943c 125 {
andrewboyson 7:024ace6d943c 126 uint32_t time = TimeGet();
andrewboyson 7:024ace6d943c 127 TimeToTm(time, ptm);
andrewboyson 7:024ace6d943c 128 }
andrewboyson 6:be97d38e0b01 129 static Timer timer;
andrewboyson 6:be97d38e0b01 130 int TimeScanUs = 0;
andrewboyson 6:be97d38e0b01 131 int TimeMain()
andrewboyson 6:be97d38e0b01 132 {
andrewboyson 6:be97d38e0b01 133 int scanUs = timer.read_us();
andrewboyson 6:be97d38e0b01 134 timer.reset();
andrewboyson 6:be97d38e0b01 135 timer.start();
andrewboyson 6:be97d38e0b01 136 if (scanUs > TimeScanUs) TimeScanUs++;
andrewboyson 6:be97d38e0b01 137 if (scanUs < TimeScanUs) TimeScanUs--;
andrewboyson 6:be97d38e0b01 138 return 0;
andrewboyson 6:be97d38e0b01 139 }
andrewboyson 6:be97d38e0b01 140 int TimeInit()
andrewboyson 6:be97d38e0b01 141 {
andrewboyson 6:be97d38e0b01 142 ticker.attach_us(&tick, ONE_MILLION >> 4);
andrewboyson 6:be97d38e0b01 143 timer.stop();
andrewboyson 6:be97d38e0b01 144 timer.reset();
andrewboyson 6:be97d38e0b01 145 return 0;
andrewboyson 6:be97d38e0b01 146 }