Watchy/src/WatchyRTC.cpp

#include "WatchyRTC.h"

WatchyRTC::WatchyRTC() : rtc_ds(false) {}

void WatchyRTC::init() {
  byte error;
  Wire.beginTransmission(RTC_DS_ADDR);
  error = Wire.endTransmission();
  if (error == 0) {
    rtcType = DS3231;
  } else {
    Wire.beginTransmission(RTC_PCF_ADDR);
    error = Wire.endTransmission();
    if (error == 0) {
      rtcType = PCF8563;
    } else {
      // RTC Error
    }
  }
}

void WatchyRTC::config(
    String datetime) { // String datetime format is YYYY:MM:DD:HH:MM:SS
  if (rtcType == DS3231) {
    _DSConfig(datetime);
  } else {
    _PCFConfig(datetime);
  }
}

void WatchyRTC::clearAlarm() {
  if (rtcType == DS3231) {
    rtc_ds.alarm(DS3232RTC::ALARM_2);
  } else {
    int nextAlarmMinute = 0;
    rtc_pcf.clearAlarm(); // resets the alarm flag in the RTC
    nextAlarmMinute = rtc_pcf.getMinute();
    nextAlarmMinute =
        (nextAlarmMinute == 59)
            ? 0
            : (nextAlarmMinute + 1); // set alarm to trigger 1 minute from now
    rtc_pcf.setAlarm(nextAlarmMinute, 99, 99, 99);
  }
}

void WatchyRTC::read(tmElements_t &tm) {
  if (rtcType == DS3231) {
    rtc_ds.read(tm);
  } else {
    rtc_pcf.getDate();
    tm.Year  = y2kYearToTm(rtc_pcf.getYear());
    tm.Month = rtc_pcf.getMonth();
    tm.Day   = rtc_pcf.getDay();
    tm.Wday =
        rtc_pcf.getWeekday() + 1; // TimeLib & DS3231 has Wday range of 1-7, but
                                  // PCF8563 stores day of week in 0-6 range
    tm.Hour   = rtc_pcf.getHour();
    tm.Minute = rtc_pcf.getMinute();
    tm.Second = rtc_pcf.getSecond();
  }
}

void WatchyRTC::set(tmElements_t tm) {
  if (rtcType == DS3231) {
    time_t t = makeTime(tm);
    rtc_ds.set(t);
  } else {
    time_t t = makeTime(tm); // make and break to calculate tm.Wday
    breakTime(t, tm);
    // day, weekday, month, century(1=1900, 0=2000), year(0-99)
    rtc_pcf.setDate(
        tm.Day, tm.Wday - 1, tm.Month, 0,
        tmYearToY2k(tm.Year)); // TimeLib & DS3231 has Wday range of 1-7, but
                               // PCF8563 stores day of week in 0-6 range
    // hr, min, sec
    rtc_pcf.setTime(tm.Hour, tm.Minute, tm.Second);
    clearAlarm();
  }
}

uint8_t WatchyRTC::temperature() {
  if (rtcType == DS3231) {
    return rtc_ds.temperature();
  } else {
    return 255; // error
  }
}

void WatchyRTC::_DSConfig(
    String datetime) { // String datetime is YYYY:MM:DD:HH:MM:SS
  if (datetime != "") {
    tmElements_t tm;
    tm.Year = CalendarYrToTm(_getValue(datetime, ':', 0).toInt()); // YYYY -
                                                                   // 1970
    tm.Month  = _getValue(datetime, ':', 1).toInt();
    tm.Day    = _getValue(datetime, ':', 2).toInt();
    tm.Hour   = _getValue(datetime, ':', 3).toInt();
    tm.Minute = _getValue(datetime, ':', 4).toInt();
    tm.Second = _getValue(datetime, ':', 5).toInt();
    time_t t  = makeTime(tm);
    rtc_ds.set(t);
  }
  // https://github.com/JChristensen/DS3232RTC
  rtc_ds.squareWave(DS3232RTC::SQWAVE_NONE); // disable square wave output
  rtc_ds.setAlarm(DS3232RTC::ALM2_EVERY_MINUTE, 0, 0, 0,
                  0); // alarm wakes up Watchy every minute
  rtc_ds.alarmInterrupt(DS3232RTC::ALARM_2, true); // enable alarm interrupt
}

void WatchyRTC::_PCFConfig(
    String datetime) { // String datetime is YYYY:MM:DD:HH:MM:SS
  if (datetime != "") {
    tmElements_t tm;
    tm.Year = CalendarYrToTm(_getValue(datetime, ':', 0).toInt()); // YYYY -
                                                                   // 1970
    tm.Month  = _getValue(datetime, ':', 1).toInt();
    tm.Day    = _getValue(datetime, ':', 2).toInt();
    tm.Hour   = _getValue(datetime, ':', 3).toInt();
    tm.Minute = _getValue(datetime, ':', 4).toInt();
    tm.Second = _getValue(datetime, ':', 5).toInt();
    time_t t  = makeTime(tm); // make and break to calculate tm.Wday
    breakTime(t, tm);
    // day, weekday, month, century(1=1900, 0=2000), year(0-99)
    rtc_pcf.setDate(
        tm.Day, tm.Wday - 1, tm.Month, 0,
        tmYearToY2k(tm.Year)); // TimeLib & DS3231 has Wday range of 1-7, but
                               // PCF8563 stores day of week in 0-6 range
    // hr, min, sec
    rtc_pcf.setTime(tm.Hour, tm.Minute, tm.Second);
  }
  // on POR event, PCF8563 sets month to 0, which will give an error since
  // months are 1-12
  clearAlarm();
}

String WatchyRTC::_getValue(String data, char separator, int index) {
  int found      = 0;
  int strIndex[] = {0, -1};
  int maxIndex   = data.length() - 1;

  for (int i = 0; i <= maxIndex && found <= index; i++) {
    if (data.charAt(i) == separator || i == maxIndex) {
      found++;
      strIndex[0] = strIndex[1] + 1;
      strIndex[1] = (i == maxIndex) ? i + 1 : i;
    }
  }

  return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
}