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