Pinguino as a real time clock

The timer 1 can be used as a real time clock. I wrote this simple example to test this function.
It will be incorporated to the tutorial website.



and this is the code to start the clock and display the result on the serial:


// Real time clock with a 18F2550 and Pinguino
// Jean-Pierre Mandon 2010
byte hours,mins,secs;
void setup()
{
// configure TIMER 1 to be used as RTCC
TMR1H=0x80;
TMR1L=0;
T1CON=0b00001111;

// init current time
hours=12;
mins=0;
secs=0;

// init interrupt for RTCC module
PIE1bits.TMR1IE=1;
INTCONbits.PEIE=1;
INTCONbits.GIE=1;

// init Serial to display time
Serial.begin(9600);
Serial.print("\r\n");
Serial.print("Pinguino clock\r\n");
}


// timer 1 is interrupt driven
void UserInterrupt()
{
TMR1H=0x80;
PIR1bits.TMR1IF=0;
secs++;
if (secs==60)
{
secs=0;
mins++;
if (mins==60)
{
mins=0;
hours++;
if (hours==24) hours=0;
}
}
}

// The main loop display time on a serial terminal
void loop()
{
if (hours<10) Serial.print("0");
Serial.print(hours,DEC);
Serial.print(":");
if (mins<10) Serial.print("0");
Serial.print(mins,DEC);
Serial.print(":");
if (secs<10) Serial.print("0");
Serial.print(secs,DEC);
Serial.print("\r");
}