first commit

libraries/RTCLib_by_NeiroN/examples/ds13_ram/ds13_ram.ino

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+// Example for using internal RAM on DS series chips
+
+#include <Wire.h>
+#include <RTClib.h>
+
+// For DS1302 pin configuration, please check ds1302 example
+DS1302 rtc;
+//DS1307 rtc;
+//DS3231 rtc;
+
+#define BUFSIZE DS1302_RAMSIZE
+//#define BUFSIZE DS1307_RAMSIZE
+
+// buffer
+char buf[BUFSIZE];
+
+void printArray(const byte* ptr, int len) {
+  Serial.print("[");
+  for (int i = 0; i < len - 1; i++) {
+    Serial.print(*(ptr + i), DEC);
+    Serial.print(", ");
+  }
+  Serial.print(*(ptr + len - 1), DEC);
+  Serial.println("]");
+}
+
+void setup() {
+  Serial.begin(9600);
+  Wire.begin(); // for DS1307
+  rtc.begin();
+
+  if (!rtc.isrunning()) {
+    Serial.println("RTC is NOT running!");
+    // following line sets the RTC to the date & time this sketch was compiled
+    rtc.adjust(DateTime(__DATE__, __TIME__));
+  }
+
+  byte b = 63;
+  Serial.print("Set first byte of RAM to: ");
+  rtc.writeram(0, b);
+  Serial.println(b);
+
+  Serial.print("Get first byte of RAM: ");
+  b = rtc.readram(0);
+  Serial.println(b);
+  Serial.println();
+
+  // test data
+  for (int i = 0; i < BUFSIZE; i++) buf[i] = i;
+
+  rtc.putram(buf, BUFSIZE);
+}
+
+void loop() {
+  static int counter = 0;
+
+  DateTime now = rtc.now();
+
+  Serial.println("Previous data in RAM:");
+  rtc.getram(buf, BUFSIZE);
+  printArray(buf, BUFSIZE);
+
+  Serial.println("Setting new data to RAM:");
+  snprintf(buf, BUFSIZE, "%s count %d", now.tostr(buf), counter);
+  Serial.println(buf);
+  rtc.putram(buf, BUFSIZE);
+
+  counter++;
+
+  Serial.println();
+  delay(3000);
+}