/*----------------------------------------------------------------------*

* Example sketch for Arduino MCP79412 Library by Jack Christensen *

* *

* Set the RTC by entering a "Set" command on the serial monitor. *

* Use a 24-hour clock and enter the command (case sensitive) exactly *

* as follows: Set yyyy-mm-dd hh:mm:ss *

* *

* This work is licensed under the Creative Commons Attribution- *

* ShareAlike 3.0 Unported License. To view a copy of this license, *

* visit http://creativecommons.org/licenses/by-sa/3.0/ or send a *

* letter to Creative Commons, 171 Second Street, Suite 300, *

* San Francisco, California, 94105, USA. *

*----------------------------------------------------------------------*/

#include <MCP79412RTC.h> //http://github.com/JChristensen/MCP79412RTC

#include <Time.h> //http://www.arduino.cc/playground/Code/Time

#include <Wire.h> //http://arduino.cc/en/Reference/Wire (included with Arduino IDE)

#define PRINT_INTERVAL 1000 //ms between printing the time

unsigned long ms, msLast;

void setup()

{

delay(2000);

Serial.begin(9600);

setSyncProvider(RTC.get); //the function to get the time from the RTC

Serial.print("RTC SYNC");

if (timeStatus() != timeSet) Serial.print(" FAIL");

Serial.println();

}

void loop(void)

{

ms = millis();

readCommand();

if (ms - msLast >= PRINT_INTERVAL) {

msLast = ms;

printTime(now());

}

}

//Read command from the Arduino serial monitor to set the RTC.

//Case-sensitive and must be entered exactly as (24-hour clock):

// Set yyyy-mm-dd hh:mm:ss

void readCommand()

{

char cmd[24] = "Set yyyy-mm-dd hh:mm:ss";

static int i;

tmElements_t tmSet;

time_t tSet;

if (Serial.available() >= 23) { //enough characters for the whole command?

i = 0; //yes, read the available characters

while (Serial.available() > 0) {

if (i >= sizeof(cmd) - 1) { //more than we can enjoy

flushInput(); //clear out the input buffer

Serial.print("Too long: ");

Serial.println(cmd);

return;

}

delay(2); //let the next character trickle in

cmd[i++] = char(Serial.read());

}

cmd[i] = 0; //put in string terminator

if (strncmp(cmd, "Set ", 4) == 0) {

tmSet.Year = 1000 * (cmd[4] - '0') + 100 * (cmd[5] - '0') + 10 * (cmd[6] - '0') + cmd[7] - '0' - 1970;

tmSet.Month = 10 * (cmd[9] - '0') + cmd[10] - '0';

tmSet.Day = 10 * (cmd[12] - '0') + cmd[13] - '0';

tmSet.Hour = 10 * (cmd[15] - '0') + cmd[16] - '0';

tmSet.Minute = 10 * (cmd[18] - '0') + cmd[19] - '0';

tmSet.Second = 10 * (cmd[21] - '0') + cmd[22] - '0';

tSet = makeTime(tmSet); //convert to time_t

setTime(tSet); //set the system time

RTC.set(now()); //set the rtc

Serial.println("RTC set!");

flushInput(); //discard any extraneous trailing characters

}

else {

Serial.print("Unknown: ");

Serial.println(cmd);

}

}

}

void flushInput(void)

{

do {

delay(2);

Serial.read();

} while (Serial.available() > 0);

}

//Print time (and date) given a time_t value

void printTime(time_t t)

{

printI00(hour(t), ':');

printI00(minute(t), ':');

printI00(second(t), ' ');

Serial.print(dayShortStr(weekday(t)));

Serial.print(' ');

printI00(day(t), ' ');

Serial.print(monthShortStr(month(t)));

Serial.print(' ');

Serial.println(year(t));

}

//Print an integer in "00" format (with leading zero),

//followed by a delimiter.

//Input value assumed to be between 0 and 99.

void printI00(int val, char delim)

{

if (val < 10) Serial.print('0');

Serial.print(val);

Serial.print(delim);

return;

}