first commit

libraries/RTCLib_by_NeiroN/examples/pcf_alarm/pcf_alarm.ino

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+#include <Wire.h>
+#include <RTClib.h>
+
+PCF8563 rtc;
+DateTime alarm_l;
+const byte rtc_int = 2;
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("start");
+  pinMode(rtc_int, INPUT);
+  attachInterrupt(digitalPinToInterrupt(rtc_int), interrupt, FALLING);
+  Wire.begin();
+  rtc.begin();
+
+  if (!rtc.isrunning()) {
+    Serial.println("RTC is NOT running!");
+    rtc.adjust(DateTime(__DATE__, __TIME__));
+  }
+  else {
+    Serial.println("RTC OK");
+    DateTime now = DateTime(2020, 4, 1, 12, 00, 0);
+    rtc.adjust(now);
+
+    setAlarm(1);
+  }
+}
+
+void loop() {
+  DateTime now = rtc.now();
+  char buf[100];
+  strncpy(buf, "DD.MM.YYYY hh:mm:ss", 100);
+  Serial.println(now.format(buf));
+
+  delay(1000);
+}
+
+void interrupt() {
+  Serial.println("WakeUp atmega");
+}
+
+void setAlarm(int value) {
+  char buf[100];
+  strncpy(buf, "DD.MM.YYYY hh:mm:ss", 100);
+
+  DateTime alarm = rtc.now();
+  alarm.setminute(alarm.minute() + value);
+  Serial.print("Setting alarm: ");
+  strncpy(buf, "DD hh:mm MM", 100);
+  Serial.println(alarm.format(buf));
+  rtc.set_alarm(alarm, {1, 0, 0, 0});
+  rtc.on_alarm();
+}