switch to setup for Arduino Boards Manager

digistump-sam/libraries/RTC/examples/Due_RTC_Alarm_Sample/Due_RTC_Alarm_Sample.ino

@@ -0,0 +1,32 @@
+#include <rtc_clock.h>
+
+// Select the Slowclock source
+//RTC_clock rtc_clock(RC);
+RTC_clock rtc_clock(XTAL);
+
+char* daynames[]={"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
+
+void setup() {
+  Serial.begin(9600);
+  rtc_clock.init();
+  rtc_clock.set_time(10, 29, 49);
+  
+  rtc_clock.set_alarmtime(10, 30, 0);
+  
+  rtc_clock.attachalarm(announcement);
+//  rtc_clock.disable_alarm();
+}
+
+void loop() {
+  Serial.print("At the third stroke, it will be ");
+  Serial.print(rtc_clock.get_hours());
+  Serial.print(":");
+  Serial.print(rtc_clock.get_minutes());
+  Serial.print(":");
+  Serial.println(rtc_clock.get_seconds());
+}
+
+void announcement() {
+  Serial.println();
+  Serial.println("Get up and buy an Arduino Due.");
+}