I'm moving up from my trusty 3.2 to 4.0. The changes in Serial ports and in the RTC have caused me a few headaches, mostly solved. What I cannot solve is how to stop teensyduino from setting the RTC every time I upload a sketch. In my application I'm setting the time to UTC and calculating the timezone time in the part of the country I'm currently in. My understanding was that when the time is initially set, teensy loader would not change it but that is not what is happening. Every time I upload, it sets the time to the PC time. I'm testing using the example sketch TimeTeensy3.
Thanks.
Thanks.
Code:
/*
* TimeRTC.pde
* example code illustrating Time library with Real Time Clock.
*
*/
#include <TimeLib.h>
void setup() {
// set the Time library to use Teensy 3.0's RTC to keep time
setSyncProvider(getTeensy3Time);
Serial.begin(9600);
while (!Serial); // Wait for Arduino Serial Monitor to open
delay(100);
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) {
Teensy3Clock.set(t); // set the RTC
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();
}
time_t getTeensy3Time()
{
return Teensy3Clock.get();
}
/* 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;
}
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);
}