82 lines
2.2 KiB
Arduino
82 lines
2.2 KiB
Arduino
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/*
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* TimeSerial.pde
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* example code illustrating Time library set through serial port messages.
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*
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* Messages consist of the letter T followed by ten digit time (as seconds since Jan 1 1970)
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* you can send the text on the next line using Serial Monitor to set the clock to noon Jan 1 2013
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T1357041600
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*
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* A Processing example sketch to automatically send the messages is included in the download
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* On Linux, you can use "date +T%s\n > /dev/ttyACM0" (UTC time zone)
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*/
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#include <TimeLib.h>
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#define TIME_HEADER "T" // Header tag for serial time sync message
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#define TIME_REQUEST 7 // ASCII bell character requests a time sync message
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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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pinMode(13, OUTPUT);
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setSyncProvider( requestSync); //set function to call when sync required
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Serial.println("Waiting for sync message");
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}
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void loop(){
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if (Serial.available()) {
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processSyncMessage();
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}
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if (timeStatus()!= timeNotSet) {
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digitalClockDisplay();
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}
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if (timeStatus() == timeSet) {
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digitalWrite(13, HIGH); // LED on if synced
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} else {
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digitalWrite(13, LOW); // LED off if needs refresh
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}
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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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void processSyncMessage() {
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unsigned long pctime;
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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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if( pctime >= DEFAULT_TIME) { // check the integer is a valid time (greater than Jan 1 2013)
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setTime(pctime); // Sync Arduino clock to the time received on the serial port
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}
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}
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}
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time_t requestSync()
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{
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Serial.write(TIME_REQUEST);
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return 0; // the time will be sent later in response to serial mesg
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}
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