Initial commit

src/WatchyRTC.cpp

@@ -0,0 +1,112 @@
+#include "WatchyRTC.h"
+
+WatchyRTC::WatchyRTC()
+{
+}
+
+void WatchyRTC::init() {
+  byte error;
+  Wire.beginTransmission(RTC_PCF_ADDR);
+  error = Wire.endTransmission();
+}
+
+void WatchyRTC::config(String datetime) { // String datetime format is YYYY:MM:DD:HH:MM:SS
+  _PCFConfig(datetime);
+}
+
+void WatchyRTC::clearAlarm() {
+  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, int offsetInSeconds) {
+  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();
+
+  int day = tm.Day;
+  int hour = tm.Hour;
+  int minute = tm.Minute;
+  int second = tm.Second;
+
+  // adjust for offset - making some assumptions here: month and year will never change.
+  second += offsetInSeconds;
+  if (second >= 60 || second < 0) {
+    minute += second / 60;
+    second = second % 60;
+  }
+
+  if (minute >= 60 || minute < 0) {
+    hour += minute / 60;
+    minute = minute % 60;
+  }
+
+  if (hour >= 24 || hour < 0) {
+    day += hour / 24;
+    hour = hour % 24;
+  }
+
+  tm.Day = day;
+  tm.Hour = hour;
+  tm.Minute = minute;
+  tm.Second = second;
+}
+
+void WatchyRTC::set(tmElements_t tm) {
+  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));
+  rtc_pcf.setTime(tm.Hour, tm.Minute, tm.Second);
+  clearAlarm();
+}
+
+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]) : "";
+}