// PIC18 in C - Versione 0.1 - Luglio 2014
// Copyright (c) 2014, Vincenzo Villa
// Creative Commons | Attribuzione-Condividi allo stesso modo 3.0 Unported.
// Creative Commons | Attribution-Share Alike 3.0 Unported
// https://www.vincenzov.net/tutorial/PIC18/pwm.htm

// Reference: PIC18F14K50 data sheet

#define _XTAL_FREQ 1000000 // Default PIC18F14K50 clock

#define TIMER2_VALUE 195u // See text - 2.5 Hz blink

#include "configurationsbits.h"

void interrupt my_isr_l(void) {
    if (PIR1bits.TMR2IF) // Interrupt from TMR2 to PR2 Match ?
    {
        LATCbits.LC0 = ~LATCbits.LC0; // Change LEDs status
        PIR1bits.TMR2IF = 0; // Clear interrupt status
    }
}

void main(void) {

    TRISC = 0x00; // Set PORTC as output

    RCONbits.IPEN = 1; // Enable priority levels on interrupts

    T2CONbits.T2OUTPS = 15; // 1:16 Postscale
    T2CONbits.T2CKPS = 2; // 1:16 Prescaler
    PR2 = TIMER2_VALUE; // Timer2 Period Register (end count)
    PIE1bits.TMR2IE = 1; // Enables the TMR2 to PR2 match interrupt
    IPR1bits.TMR2IP = 1; // TMR2 to PR2 Match Interrupt Priority set to high

    T2CONbits.TMR2ON = 1; // Timer2 is on

    INTCONbits.GIEH = 1; // Enables all interrupts

    while (1);
}