64 lines
1.7 KiB
C++
64 lines
1.7 KiB
C++
// Example of using the non-volatile RAM storage on the DS1307.
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// You can write up to 56 bytes from address 0 to 55.
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// Data will be persisted as long as the DS1307 has battery power.
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#include <Wire.h>
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#include "RTClib.h"
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#if defined(ARDUINO_ARCH_SAMD)
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// for Zero, output on USB Serial console, remove line below if using programming port to program the Zero!
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#define Serial SerialUSB
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#endif
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RTC_DS1307 rtc;
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void printnvram(uint8_t address) {
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Serial.print("Address 0x");
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Serial.print(address, HEX);
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Serial.print(" = 0x");
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Serial.println(rtc.readnvram(address), HEX);
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}
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void setup () {
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#ifndef ESP8266
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while (!Serial); // for Leonardo/Micro/Zero
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#endif
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Serial.begin(57600);
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rtc.begin();
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// Print old RAM contents on startup.
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Serial.println("Current NVRAM values:");
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for (int i = 0; i < 6; ++i) {
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printnvram(i);
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}
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// Write some bytes to non-volatile RAM storage.
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// NOTE: You can only read and write from addresses 0 to 55 (i.e. 56 byte values).
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Serial.println("Writing NVRAM values.");
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// Example writing one byte at a time:
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rtc.writenvram(0, 0xFE);
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rtc.writenvram(1, 0xED);
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// Example writing multiple bytes:
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uint8_t writeData[4] = { 0xBE, 0xEF, 0x01, 0x02 };
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rtc.writenvram(2, writeData, 4);
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// Read bytes from non-volatile RAM storage.
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Serial.println("Reading NVRAM values:");
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// Example reading one byte at a time.
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Serial.println(rtc.readnvram(0), HEX);
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Serial.println(rtc.readnvram(1), HEX);
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// Example reading multiple bytes:
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uint8_t readData[4] = {0};
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rtc.readnvram(readData, 4, 2);
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Serial.println(readData[0], HEX);
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Serial.println(readData[1], HEX);
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Serial.println(readData[2], HEX);
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Serial.println(readData[3], HEX);
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}
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void loop () {
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// Do nothing in the loop.
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}
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