//
// Interrupts
//
// 

#include <p24fj128ga010.h>

// notify the compiler we are not modifying the PSV
#define _NOPSV  __attribute__((no_auto_psv))

int dSec = 0;
int Sec = 0;
int Min = 0;

// 1. Timer1 interrupt service routine
void _ISR _NOPSV _T1Interrupt( void) 
{
	// 1.1 your code here
	dSec++;			// increment the tens of a second counter
	if ( dSec > 9) 	// 10 tens in a second
	{ 
		dSec = 0;
		Sec++;		// increment the seconds counter
		
		if ( Sec > 59)	// 60 seconds make a minute
		{
			Sec = 0;
			Min++;	// increment the minute counter
	
			if ( Min > 59)// 59 minutes in an hour
				Min = 0;
		} // minutes
	} // seconds

	// 1.2 clear the interrupt flag
	_T1IF = 0;
	
} //T1Interrupt

main()
{
	// 2. init Timer 1, T1ON, 1:1 prescaler, internal source
	_T1IP = 4; 		// this is the default value anyway
	TMR1 = 0;		// clear the timer
	PR1 = 25000-1;	// set the period register
	TRISA = 0xff00;	// set PORTA lsb as output
	
	// 2.1 configure Timer1 module
	T1CON = 0x8020;	// enabled, prescaler 1:64, internal clock 	
	
	// 2.2 init the Timer 1 Interrupt, clear the flag, enable
	_T1IF = 0;	
	_T1IE = 1;
	
	// 2.3 init the processor priority level
	_IPL = 0;	// this is the default value anyway
	
	// 3. main loop
	while( 1)
	{
		// your main code here
		PORTA = Sec;   
		
	} // main loop

} // main