Tested on BluePill for new function of RTC

Author: csnol

STM32F1/libraries/RTClock/examples/BlutPill-RTClock-test/BlutPill-RTClock-test.ino

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+/*   STM32F103C8 Blue Pill ( PC13)
+
+  Serialport set and display RTC clock , Write by CSNOL https://github.com/csnol/STM32-Examples
+  based on https://github.com/rogerclarkmelbourne/Arduino_STM32
+
+  1. Blink on PC13 per 4s or 7s by attachAlarmInterrupt for 10 times
+  2. Second counter by attachSecondsInterrpt
+  3. Serial output on(41s) or off(21s) by creatAlarm
+  4. change to your timezone in the sketch; .
+  3. get Unix epoch time from https://www.epochconverter.com/ ;
+  4. last step input the 10 bits number( example: 1503945555) to Serialport ;
+  5. the clock will be reset to you wanted.
+
+  ##  Why the 10 bits Unix epoch time be used?
+****Because I wanna connect to NTP server by ESP-8266.
+****in the <NTPClient.h> library. getNtpTime() will return this 10 bits Unix epoch time.
+*/
+
+
+#include <RTClock.h>
+
+RTClock rtclock (RTCSEL_LSE); // initialise
+int timezone = 8;      // change to your timezone
+time_t tt;
+time_t tt1;
+tm_t mtt = { 47, 9, 13, 3, 1, 22, 30, 30 };    // init time 47+1970 = 2017  Unix epoch Time counted from 00:00:00 1 Jan 1970  
+char weekday1[][7] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};  // 0,1,2,3,4,5,6
+uint8_t dateread[11];
+int globAlmCount = 0;
+int lastGlobAlmCount;
+int SPECAlmCount = 0;
+int lastSPECAlmCount;
+int i = 0;
+int alarmcount = 3;
+uint8_t AlarmExchange = 0;
+bool dispflag = true;
+
+#define LED_PIN PC13
+
+// This function is called in the attachSecondsInterrpt
+void SecondCount ()
+{
+  tt++;
+}
+// This function is called in the attachAlarmInterrpt
+void blink ()
+{
+  digitalWrite(LED_PIN, !digitalRead(LED_PIN));
+  globAlmCount++;
+  //tt++;
+}
+
+void OnOffSerial ()
+{
+  dispflag = !dispflag;
+  SPECAlmCount++;
+}
+
+void setup()
+{
+  lastGlobAlmCount = ~globAlmCount;
+  lastSPECAlmCount = ~SPECAlmCount;
+  Serial.begin(115200);
+  pinMode(LED_PIN, OUTPUT);
+  tt = rtclock.makeTime(mtt);   
+  tt1 = tt;
+  rtclock.attachAlarmInterrupt(blink);// Call blink
+  rtclock.attachSecondsInterrupt(SecondCount);// Call SecondCount
+}
+
+void loop()
+{
+  while (Serial.available())
+  { dateread[i] = Serial.read();
+    if (i < 11) {
+      i++;
+    }
+    else {
+      i = 0;
+      tt = (dateread[0] - '0') * 1000000000 + (dateread[1] - '0') * 100000000 + (dateread[2] - '0') * 10000000 + (dateread[3] - '0') * 1000000 + (dateread[4] - '0') * 100000;
+      tt += (dateread[5] - '0') * 10000 + (dateread[6] - '0') * 1000 + (dateread[7] - '0') * 100 + (dateread[8] - '0') * 10 + (dateread[9] - '0');
+      tt = rtclock.TimeZone(tt, timezone);    //adjust to your local date
+    }
+  }
+  if (lastGlobAlmCount != globAlmCount | lastSPECAlmCount != SPECAlmCount ) {
+    if (globAlmCount == 10) {        // to detachAlarmInterrupt and start creatAlarm after 10 times about 110s
+      rtclock.detachAlarmInterrupt();
+      globAlmCount = 0;
+      rtclock.createAlarm(OnOffSerial, (rtclock.getTime() + 20));   // call OnOffSerial stop output date from Serial after 2 mins
+      alarmcount = 20;   //change to creatAlarm  21S close Serial output and 41s open Serial output.
+    }
+    else {
+      lastGlobAlmCount = globAlmCount;
+      lastSPECAlmCount = SPECAlmCount;
+      Serial.println(" Say hello to every guys ");
+      if(dispflag == false)
+      Serial.println(" SPECAlarm turn Display Off ");
+      switch (AlarmExchange)  {
+        case 0:
+          rtclock.setAlarmTime(rtclock.getTime() + alarmcount);  // reset alarm = current time + 4s for attachAlarmInterrupt,  21s for creatAlarm
+          AlarmExchange = 1;
+          break;
+        case 1:
+          rtclock.breakTime(rtclock.getTime() + alarmcount * 2, mtt); //// reset alarm = current time + 7s for attachAlarmInterrupt,  41s for creatAlarm
+          rtclock.setAlarmTime(mtt);
+          AlarmExchange = 0;
+          break;
+      }
+    }
+  }
+  if (tt1 != tt & dispflag == true )
+  {
+    tt1 = tt;
+    rtclock.breakTime(tt, mtt);
+    Serial.print("Date:  ");
+    Serial.print(mtt.day);
+    Serial.print("- ");
+    Serial.print(mtt.month);
+    Serial.print("  ");
+    Serial.print(mtt.year + 1970);
+    Serial.print("  ");
+    Serial.print(weekday1[mtt.weekday]);
+    Serial.print("  Time: ");
+    Serial.print(mtt.hour);
+    Serial.print(" : ");
+    Serial.print(mtt.minute);
+    Serial.print(" : ");
+    Serial.println(mtt.second);
+  }
+}