Who needs a Software Real Time Clock?

Forum 2005-2010 (read only) Software Development
17

That code worked for well over a half an hour without a hitch and I haven't had any trouble with any other code running on it before. Your question about serial data had me thinking so I tried a modified version of the playground code to try to eliminate that possibility.
I came up with this:

#include <DateTime.h>
#include <DateTimeStrings.h>

void setup(){
  Serial.begin(19200);
}

void  loop(){  
 DateTime.sync(1218757280);   // Sync DateTime clock to the time received on the serial port
 while (1){
  if(DateTime.available()) { // update clocks if time has been synced
    unsigned long prevtime = DateTime.now();
    while( prevtime == DateTime.now() )  // wait for the second to rollover
      ;
    DateTime.available(); //refresh the Date and time properties
    digitalClockDisplay( );   // update digital clock

    // send our time to an app listening on the serial port
    Serial.println(DateTime.now());      
  }
 }
}

void digitalClockDisplay(){
  // digital clock display of current time
  Serial.print(DateTime.Hour,DEC);  
  printDigits(DateTime.Minute);  
  printDigits(DateTime.Second);
  Serial.print(" ");
  Serial.print(DateTimeStrings.dayStr(DateTime.DayofWeek));
  Serial.print(" ");  
  Serial.print(DateTimeStrings.monthStr(DateTime.Month));  
  Serial.print(" ");
  Serial.println(DateTime.Day, DEC);  
}

void printDigits(byte digits){
  // utility function for digital clock display: prints colon and leading 0
  Serial.print(":");
  if(digits < 10)
    Serial.print('0');
  Serial.print(digits,DEC);  
}

Unfortunately I got the same problem, a freeze, and then a bit later a seemingly random date and time started up again. If you had it running with no problems then I'm wondering if it might be a hardware issue of some sort.

edit: I'm starting to wonder if it is indeed a random date and time it restarts at: with this code it always seems to jump to October 3rd when it starts up again... hmm.