// ******************************************************************************************* //
// Include file for PIC24FJ64GA002 microcontroller. This include file defines
// MACROS for special function registers (SFR) and control bits within those
// registers.

#include "p24fj64ga002.h"

// ******************************************************************************************* //
// Configuration bits for CONFIG1 settings. 
//
// Make sure "Configuration Bits set in code." option is checked in MPLAB.
// This option can be set by selecting "Configuration Bits..." under the Configure
// menu in MPLAB.
//
// These settings are appropriate for debugging the PIC microcontroller. If you need to 
// program the PIC for standalone operation, change the COE_ON option to COE_OFF.

_CONFIG1( JTAGEN_OFF & GCP_OFF & GWRP_OFF & 
          BKBUG_ON & COE_ON & ICS_PGx1 & 
          FWDTEN_OFF & WINDIS_OFF & FWPSA_PR128 & WDTPS_PS32768 )

// ******************************************************************************************* //
// Configuration bits for CONFIG2 settings.
// Make sure "Configuration Bits set in code." option is checked in MPLAB. 
// This option can be set by selecting "Configuration Bits..." under the Configure
// menu in MPLAB.

_CONFIG2( IESO_OFF & SOSCSEL_SOSC & WUTSEL_LEG & FNOSC_PRIPLL & FCKSM_CSDCMD & OSCIOFNC_OFF &
          IOL1WAY_OFF & I2C1SEL_PRI & POSCMOD_XT )

// ******************************************************************************************* //

int main(void)
{

	// TRISB controls direction for all PORTB pins, where 0 -> output, 1 -> input.
	// Configure RB15-RB12 as outputs.
	_TRISB15 = 0;

	// Initialize LED to off
	_LATB15 = 1;

	// TODO: Set Timer1's Prescaler to 1:256

	// TODO: Set Timer 1's period value regsiter (PR1) to value for 250ms. 

	// Clear Timer value (i.e. current tiemr value) to 0
	TMR1 = 0;				
	
	// TODO: Clear Timer 1 interrupt flag to detect first interupt.

	// TODO: Enable the interrupt for Timer 1

	// Start Timer 1
	T1CONbits.TON = 1;

	while(1)
	{
		// Nothing to see here. Move along everybody.
	}
	return 0;
}

// ******************************************************************************************* //
// Defines an interrupt service routine that will execute whenever Timer 1's
// count reaches the specfied period value defined within the PR1 register.
// 
//     _ISR and _ISRFAST are macros for specifying interrupts that 
//     automatically inserts the proper interrupt into the interrupt vector 
//     table
//
//     _T1Interrupt is a macro for specifying the interrupt for Timer 1
//
// The functionality defined in an interrupt should be a minimal as possible
// to ensure additional interrupts can be processed. 
void _ISR _T1Interrupt(void)
{
	// TODO: Clear Timer 1 interrupt flag to allow another Timer 1 interrupt to occur.

	_LATB15 = ~(_LATB15);
}

// ******************************************************************************************* //