Create a RTC example for new library.

Author: csnol

STM32F1/libraries/RTClock/examples/RTC-Serial-Set-Newlibrary.ino

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+/*   STM32F103C8 Black Pill ( PB12)
+
+  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 PB12 per 1s.
+  2. 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
+time_t tt;
+tm_t mtt = { 47, 8, 27, 0, 1, 20, 30, 30 };
+char weekday1[][7] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};  // 0,1,2,3,4,5,6
+uint8_t timeread[11];
+int timezone = 8 * 3600;    // timezone -8 + DST +1 = -7  CA USA
+time_t tt1;
+
+#define LED_PIN PB12
+
+// This function is called in the attachSecondsInterrpt
+void blink ()
+{
+  digitalWrite(LED_PIN, !digitalRead(LED_PIN));
+  tt++;
+}
+
+void setup()
+{
+  Serial.begin(115200);
+  pinMode(LED_PIN, OUTPUT);
+  tt = rtclock.makeTime(mtt);
+  tt1 = tt;
+  rtclock.attachSecondsInterrupt(blink);// Call blink
+}
+
+
+int i = 0;
+void loop()
+{
+  while (Serial.available())
+  { timeread[i] = Serial.read();
+    if (i < 11) {
+      i++;
+    }
+    else {
+      i = 0;
+      tt = (timeread[0] - '0') * 1000000000 + (timeread[1] - '0') * 100000000 + (timeread[2] - '0') * 10000000 + (timeread[3] - '0') * 1000000 + (timeread[4] - '0') * 100000;
+      tt += (timeread[5] - '0') * 10000 + (timeread[6] - '0') * 1000 + (timeread[7] - '0') * 100 + (timeread[8] - '0') * 10 + (timeread[9] - '0') + timezone;
+    }
+  }
+  if (tt1 != tt)
+  {
+    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);
+  }
+}