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80 lines
2.0 KiB
80 lines
2.0 KiB
/*
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* TimeRTCSet.pde
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* example code illustrating Time library with Real Time Clock.
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*
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* RTC clock is set in response to serial port time message
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* A Processing example sketch to set the time is included in the download
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* On Linux, you can use "date +T%s > /dev/ttyACM0" (UTC time zone)
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*/
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#include <TimeLib.h>
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#include <Wire.h>
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#include <DS1307RTC.h> // a basic DS1307 library that returns time as a time_t
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void setup() {
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Serial.begin(9600);
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while (!Serial) ; // Needed for Leonardo only
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setSyncProvider(RTC.get); // the function to get the time from the RTC
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if (timeStatus() != timeSet)
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Serial.println("Unable to sync with the RTC");
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else
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Serial.println("RTC has set the system time");
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}
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void loop()
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{
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if (Serial.available()) {
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time_t t = processSyncMessage();
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if (t != 0) {
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RTC.set(t); // set the RTC and the system time to the received value
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setTime(t);
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}
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}
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digitalClockDisplay();
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delay(1000);
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}
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void digitalClockDisplay(){
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// digital clock display of the time
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Serial.print(hour());
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printDigits(minute());
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printDigits(second());
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Serial.print(" ");
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Serial.print(day());
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Serial.print(" ");
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Serial.print(month());
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Serial.print(" ");
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Serial.print(year());
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Serial.println();
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}
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void printDigits(int digits){
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// utility function for digital clock display: prints preceding colon and leading 0
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Serial.print(":");
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if(digits < 10)
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Serial.print('0');
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Serial.print(digits);
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}
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/* code to process time sync messages from the serial port */
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#define TIME_HEADER "T" // Header tag for serial time sync message
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unsigned long processSyncMessage() {
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unsigned long pctime = 0L;
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const unsigned long DEFAULT_TIME = 1357041600; // Jan 1 2013
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if(Serial.find(TIME_HEADER)) {
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pctime = Serial.parseInt();
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return pctime;
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if( pctime < DEFAULT_TIME) { // check the value is a valid time (greater than Jan 1 2013)
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pctime = 0L; // return 0 to indicate that the time is not valid
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}
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}
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return pctime;
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}
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