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Tasmota/tasmota/support_rtc.ino

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/*
support_rtc.ino - Real Time Clock support for Tasmota
Copyright (C) 2019 Theo Arends
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*********************************************************************************************\
* Sources: Time by Michael Margolis and Paul Stoffregen (https://github.com/PaulStoffregen/Time)
* Timezone by Jack Christensen (https://github.com/JChristensen/Timezone)
\*********************************************************************************************/
const uint32_t SECS_PER_MIN = 60UL;
const uint32_t SECS_PER_HOUR = 3600UL;
const uint32_t SECS_PER_DAY = SECS_PER_HOUR * 24UL;
const uint32_t MINS_PER_HOUR = 60UL;
#define LEAP_YEAR(Y) (((1970+Y)>0) && !((1970+Y)%4) && (((1970+Y)%100) || !((1970+Y)%400)))
extern "C" {
#include "sntp.h"
}
#include <Ticker.h>
Ticker TickerRtc;
static const uint8_t kDaysInMonth[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }; // API starts months from 1, this array starts from 0
static const char kMonthNamesEnglish[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
struct RTC {
uint32_t utc_time = 0;
uint32_t local_time = 0;
uint32_t daylight_saving_time = 0;
uint32_t standard_time = 0;
uint32_t ntp_time = 0;
uint32_t midnight = 0;
uint32_t restart_time = 0;
int32_t drift_time = 0;
int32_t time_timezone = 0;
uint8_t ntp_sync_minute = 0;
bool midnight_now = false;
bool user_time_entry = false; // Override NTP by user setting
} Rtc;
uint32_t UtcTime(void)
{
return Rtc.utc_time;
}
uint32_t LocalTime(void)
{
return Rtc.local_time;
}
int32_t DriftTime(void)
{
return Rtc.drift_time;
}
uint32_t Midnight(void)
{
return Rtc.midnight;
}
bool MidnightNow(void)
{
if (Rtc.midnight_now) {
Rtc.midnight_now = false;
return true;
}
return false;
}
bool IsDst(void)
{
if (Rtc.time_timezone == Settings.toffset[1]) {
return true;
}
return false;
}
String GetBuildDateAndTime(void)
{
// "2017-03-07T11:08:02" - ISO8601:2004
char bdt[21];
char *p;
char mdate[] = __DATE__; // "Mar 7 2017"
char *smonth = mdate;
int day = 0;
int year = 0;
// sscanf(mdate, "%s %d %d", bdt, &day, &year); // Not implemented in 2.3.0 and probably too much code
uint8_t i = 0;
for (char *str = strtok_r(mdate, " ", &p); str && i < 3; str = strtok_r(nullptr, " ", &p)) {
switch (i++) {
case 0: // Month
smonth = str;
break;
case 1: // Day
day = atoi(str);
break;
case 2: // Year
year = atoi(str);
}
}
int month = (strstr(kMonthNamesEnglish, smonth) -kMonthNamesEnglish) /3 +1;
snprintf_P(bdt, sizeof(bdt), PSTR("%d" D_YEAR_MONTH_SEPARATOR "%02d" D_MONTH_DAY_SEPARATOR "%02d" D_DATE_TIME_SEPARATOR "%s"), year, month, day, __TIME__);
return String(bdt); // 2017-03-07T11:08:02
}
String GetMinuteTime(uint32_t minutes)
{
char tm[6];
snprintf_P(tm, sizeof(tm), PSTR("%02d:%02d"), minutes / 60, minutes % 60);
return String(tm); // 03:45
}
String GetTimeZone(void)
{
char tz[7];
snprintf_P(tz, sizeof(tz), PSTR("%+03d:%02d"), Rtc.time_timezone / 60, abs(Rtc.time_timezone % 60));
return String(tz); // -03:45
}
String GetDuration(uint32_t time)
{
char dt[16];
TIME_T ut;
BreakTime(time, ut);
// "P128DT14H35M44S" - ISO8601:2004 - https://en.wikipedia.org/wiki/ISO_8601 Durations
// snprintf_P(dt, sizeof(dt), PSTR("P%dDT%02dH%02dM%02dS"), ut.days, ut.hour, ut.minute, ut.second);
// "128 14:35:44" - OpenVMS
// "128T14:35:44" - Tasmota
snprintf_P(dt, sizeof(dt), PSTR("%dT%02d:%02d:%02d"), ut.days, ut.hour, ut.minute, ut.second);
return String(dt); // 128T14:35:44
}
String GetDT(uint32_t time)
{
// "2017-03-07T11:08:02" - ISO8601:2004
char dt[20];
TIME_T tmpTime;
BreakTime(time, tmpTime);
snprintf_P(dt, sizeof(dt), PSTR("%04d-%02d-%02dT%02d:%02d:%02d"),
tmpTime.year +1970, tmpTime.month, tmpTime.day_of_month, tmpTime.hour, tmpTime.minute, tmpTime.second);
return String(dt); // 2017-03-07T11:08:02
}
/*
* timestamps in https://en.wikipedia.org/wiki/ISO_8601 format
*
* DT_UTC - current data and time in Greenwich, England (aka GMT)
* DT_LOCAL - current date and time taking timezone into account
* DT_RESTART - the date and time this device last started, in local timezone
*
* Format:
* "2017-03-07T11:08:02-07:00" - if DT_LOCAL and SetOption52 = 1
* "2017-03-07T11:08:02" - otherwise
*/
String GetDateAndTime(uint8_t time_type)
{
// "2017-03-07T11:08:02-07:00" - ISO8601:2004
uint32_t time = Rtc.local_time;
switch (time_type) {
case DT_ENERGY:
time = Settings.energy_kWhtotal_time;
break;
case DT_UTC:
time = Rtc.utc_time;
break;
case DT_RESTART:
if (Rtc.restart_time == 0) {
return "";
}
time = Rtc.restart_time;
break;
}
String dt = GetDT(time); // 2017-03-07T11:08:02
if (Settings.flag3.time_append_timezone && (DT_LOCAL == time_type)) {
dt += GetTimeZone(); // 2017-03-07T11:08:02-07:00
}
return dt; // 2017-03-07T11:08:02-07:00
}
String GetTime(int type)
{
/* type 1 - Local time
* type 2 - Daylight Savings time
* type 3 - Standard time
*/
char stime[25]; // Skip newline
uint32_t time = Rtc.utc_time;
if (1 == type) time = Rtc.local_time;
if (2 == type) time = Rtc.daylight_saving_time;
if (3 == type) time = Rtc.standard_time;
snprintf_P(stime, sizeof(stime), sntp_get_real_time(time));
return String(stime); // Thu Nov 01 11:41:02 2018
}
uint32_t UpTime(void)
{
if (Rtc.restart_time) {
return Rtc.utc_time - Rtc.restart_time;
} else {
return uptime;
}
}
uint32_t MinutesUptime(void)
{
return (UpTime() / 60);
}
String GetUptime(void)
{
return GetDuration(UpTime());
}
uint32_t MinutesPastMidnight(void)
{
uint32_t minutes = 0;
if (RtcTime.valid) {
minutes = (RtcTime.hour *60) + RtcTime.minute;
}
return minutes;
}
void BreakTime(uint32_t time_input, TIME_T &tm)
{
// break the given time_input into time components
// this is a more compact version of the C library localtime function
// note that year is offset from 1970 !!!
uint8_t year;
uint8_t month;
uint8_t month_length;
uint32_t time;
unsigned long days;
time = time_input;
tm.second = time % 60;
time /= 60; // now it is minutes
tm.minute = time % 60;
time /= 60; // now it is hours
tm.hour = time % 24;
time /= 24; // now it is days
tm.days = time;
tm.day_of_week = ((time + 4) % 7) + 1; // Sunday is day 1
year = 0;
days = 0;
while((unsigned)(days += (LEAP_YEAR(year) ? 366 : 365)) <= time) {
year++;
}
tm.year = year; // year is offset from 1970
days -= LEAP_YEAR(year) ? 366 : 365;
time -= days; // now it is days in this year, starting at 0
tm.day_of_year = time;
for (month = 0; month < 12; month++) {
if (1 == month) { // february
if (LEAP_YEAR(year)) {
month_length = 29;
} else {
month_length = 28;
}
} else {
month_length = kDaysInMonth[month];
}
if (time >= month_length) {
time -= month_length;
} else {
break;
}
}
strlcpy(tm.name_of_month, kMonthNames + (month *3), 4);
tm.month = month + 1; // jan is month 1
tm.day_of_month = time + 1; // day of month
tm.valid = (time_input > START_VALID_TIME); // 2016-01-01
}
uint32_t MakeTime(TIME_T &tm)
{
// assemble time elements into time_t
// note year argument is offset from 1970
int i;
uint32_t seconds;
// seconds from 1970 till 1 jan 00:00:00 of the given year
seconds = tm.year * (SECS_PER_DAY * 365);
for (i = 0; i < tm.year; i++) {
if (LEAP_YEAR(i)) {
seconds += SECS_PER_DAY; // add extra days for leap years
}
}
// add days for this year, months start from 1
for (i = 1; i < tm.month; i++) {
if ((2 == i) && LEAP_YEAR(tm.year)) {
seconds += SECS_PER_DAY * 29;
} else {
seconds += SECS_PER_DAY * kDaysInMonth[i-1]; // monthDay array starts from 0
}
}
seconds+= (tm.day_of_month - 1) * SECS_PER_DAY;
seconds+= tm.hour * SECS_PER_HOUR;
seconds+= tm.minute * SECS_PER_MIN;
seconds+= tm.second;
return seconds;
}
uint32_t RuleToTime(TimeRule r, int yr)
{
TIME_T tm;
uint32_t t;
uint8_t m;
uint8_t w; // temp copies of r.month and r.week
m = r.month;
w = r.week;
if (0 == w) { // Last week = 0
if (++m > 12) { // for "Last", go to the next month
m = 1;
yr++;
}
w = 1; // and treat as first week of next month, subtract 7 days later
}
tm.hour = r.hour;
tm.minute = 0;
tm.second = 0;
tm.day_of_month = 1;
tm.month = m;
tm.year = yr - 1970;
t = MakeTime(tm); // First day of the month, or first day of next month for "Last" rules
BreakTime(t, tm);
t += (7 * (w - 1) + (r.dow - tm.day_of_week + 7) % 7) * SECS_PER_DAY;
if (0 == r.week) {
t -= 7 * SECS_PER_DAY; // back up a week if this is a "Last" rule
}
return t;
}
void RtcSecond(void)
{
TIME_T tmpTime;
if (!Rtc.user_time_entry) {
if ((Rtc.ntp_sync_minute > 59) && (RtcTime.minute > 2)) Rtc.ntp_sync_minute = 1; // If sync prepare for a new cycle
uint8_t offset = (uptime < 30) ? RtcTime.second : (((ESP.getChipId() & 0xF) * 3) + 3) ; // First try ASAP to sync. If fails try once every 60 seconds based on chip id
if (!global_state.wifi_down && (((offset == RtcTime.second) && ((RtcTime.year < 2016) || (Rtc.ntp_sync_minute == RtcTime.minute))) || ntp_force_sync)) {
Rtc.ntp_time = sntp_get_current_timestamp();
if (Rtc.ntp_time > START_VALID_TIME) { // Fix NTP bug in core 2.4.1/SDK 2.2.1 (returns Thu Jan 01 08:00:10 1970 after power on)
ntp_force_sync = false;
if (Rtc.utc_time > START_VALID_TIME) { Rtc.drift_time = Rtc.ntp_time - Rtc.utc_time; }
Rtc.utc_time = Rtc.ntp_time;
Rtc.ntp_sync_minute = 60; // Sync so block further requests
if (Rtc.restart_time == 0) {
Rtc.restart_time = Rtc.utc_time - uptime; // save first ntp time as restart time
}
BreakTime(Rtc.utc_time, tmpTime);
RtcTime.year = tmpTime.year + 1970;
Rtc.daylight_saving_time = RuleToTime(Settings.tflag[1], RtcTime.year);
Rtc.standard_time = RuleToTime(Settings.tflag[0], RtcTime.year);
// Do not use AddLog here if syslog is enabled. UDP will force exception 9
// AddLog_P2(LOG_LEVEL_DEBUG, PSTR(D_LOG_APPLICATION "(" D_UTC_TIME ") %s, (" D_DST_TIME ") %s, (" D_STD_TIME ") %s"), GetTime(0).c_str(), GetTime(2).c_str(), GetTime(3).c_str());
ntp_synced_message = true;
if (Rtc.local_time < START_VALID_TIME) { // 2016-01-01
rules_flag.time_init = 1;
} else {
rules_flag.time_set = 1;
}
} else {
Rtc.ntp_sync_minute++; // Try again in next minute
}
}
}
Rtc.utc_time++;
Rtc.local_time = Rtc.utc_time;
if (Rtc.local_time > START_VALID_TIME) { // 2016-01-01
int16_t timezone_minutes = Settings.timezone_minutes;
if (Settings.timezone < 0) { timezone_minutes *= -1; }
Rtc.time_timezone = (Settings.timezone * SECS_PER_HOUR) + (timezone_minutes * SECS_PER_MIN);
if (99 == Settings.timezone) {
int32_t dstoffset = Settings.toffset[1] * SECS_PER_MIN;
int32_t stdoffset = Settings.toffset[0] * SECS_PER_MIN;
if (Settings.tflag[1].hemis) {
// Southern hemisphere
if ((Rtc.utc_time >= (Rtc.standard_time - dstoffset)) && (Rtc.utc_time < (Rtc.daylight_saving_time - stdoffset))) {
Rtc.time_timezone = stdoffset; // Standard Time
} else {
Rtc.time_timezone = dstoffset; // Daylight Saving Time
}
} else {
// Northern hemisphere
if ((Rtc.utc_time >= (Rtc.daylight_saving_time - stdoffset)) && (Rtc.utc_time < (Rtc.standard_time - dstoffset))) {
Rtc.time_timezone = dstoffset; // Daylight Saving Time
} else {
Rtc.time_timezone = stdoffset; // Standard Time
}
}
}
Rtc.local_time += Rtc.time_timezone;
Rtc.time_timezone /= 60;
if (!Settings.energy_kWhtotal_time) { Settings.energy_kWhtotal_time = Rtc.local_time; }
}
BreakTime(Rtc.local_time, RtcTime);
if (RtcTime.valid) {
if (!Rtc.midnight) {
Rtc.midnight = Rtc.local_time - (RtcTime.hour * 3600) - (RtcTime.minute * 60) - RtcTime.second;
}
if (!RtcTime.hour && !RtcTime.minute && !RtcTime.second) {
Rtc.midnight = Rtc.local_time;
Rtc.midnight_now = true;
}
}
RtcTime.year += 1970;
}
void RtcSetTime(uint32_t epoch)
{
if (epoch < START_VALID_TIME) { // 2016-01-01
Rtc.user_time_entry = false;
ntp_force_sync = true;
} else {
Rtc.user_time_entry = true;
Rtc.utc_time = epoch -1; // Will be corrected by RtcSecond
}
RtcSecond();
}
void RtcInit(void)
{
sntp_setservername(0, Settings.ntp_server[0]);
sntp_setservername(1, Settings.ntp_server[1]);
sntp_setservername(2, Settings.ntp_server[2]);
sntp_stop();
sntp_set_timezone(0); // UTC time
sntp_init();
Rtc.utc_time = 0;
BreakTime(Rtc.utc_time, RtcTime);
TickerRtc.attach(1, RtcSecond);
}
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