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83 lines
2.2 KiB
Plaintext
Executable File
83 lines
2.2 KiB
Plaintext
Executable File
/*
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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 inclided in the download
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*/
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#include <Time.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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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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{
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time_t t = processSyncMessage();
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if(t >0)
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{
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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_MSG_LEN 11 // time sync to PC is HEADER followed by unix time_t as ten ascii digits
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#define TIME_HEADER 'T' // Header tag for serial time sync message
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time_t processSyncMessage() {
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// return the time if a valid sync message is received on the serial port.
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while(Serial.available() >= TIME_MSG_LEN ){ // time message consists of a header and ten ascii digits
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char c = Serial.read() ;
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Serial.print(c);
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if( c == TIME_HEADER ) {
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time_t pctime = 0;
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for(int i=0; i < TIME_MSG_LEN -1; i++){
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c = Serial.read();
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if( c >= '0' && c <= '9'){
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pctime = (10 * pctime) + (c - '0') ; // convert digits to a number
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}
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}
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return pctime;
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}
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}
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return 0;
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}
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