add setAlarmEpoch and isConfigured API

Author: facchinm

src/RTCZero.cpp

@@ -382,6 +382,21 @@ uint32_t RTCZero::getY2kEpoch()
   return (getEpoch() - EPOCH_TIME_OFF);
 }
 
+void RTCZero::setAlarmEpoch(uint32_t ts)
+{
+  if (_configured) {
+    if (ts < EPOCH_TIME_OFF) {
+      ts = EPOCH_TIME_OFF;
+    }
+
+    time_t t = ts;
+    struct tm* tmp = gmtime(&t);
+
+    setAlarmDate(tmp->tm_year - EPOCH_TIME_YEAR_OFF, tmp->tm_mon + 1, tmp->tm_mday);
+    setAlarmTime(tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+  }
+}
+
 void RTCZero::setEpoch(uint32_t ts)
 {
   if (_configured) {

src/RTCZero.h

@@ -95,6 +95,13 @@ class RTCZero {
   uint32_t getY2kEpoch();
   void setEpoch(uint32_t ts);
   void setY2kEpoch(uint32_t ts);
+  void setAlarmEpoch(uint32_t ts);
+
+  bool isConfigured() {
+    _configured = RTC->MODE2.CTRL.reg & RTC_MODE2_CTRL_ENABLE;
+    configureClock();
+    return _configured;
+  }
 
 private:
   bool _configured;