// 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/timer1.htm

// Reference: PIC18F14K50 data sheet

#include "configurationsbits.h"
#include <plib.h>

#define _XTAL_FREQ 1000000 // Default PIC18F14K50 clock

#define TIMER1_VALUE 49999 // T1 count from 0 to 49999 (50000 count)

void interrupt __high_priority my_isr_high(void) {
    if (PIR1bits.CCP1IF == 1) // Interrupt from ECCP ?
    {
        LATCbits.LC0 = ~LATCbits.LC0; // Change RC0 pin status
        PIR1bits.CCP1IF = 0; // Clear interrupt status
    }
}

void main(void) {

    TRISC = 0x00; // Set PORTC as output

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

    OpenTimer1(TIMER_INT_OFF & T1_16BIT_RW & T1_SOURCE_INT & T1_PS_1_1);
    // Enable Timer1: internal clock, no prescaler, no interrupt

    OpenCompare1(COM_INT_ON & COM_TRIG_SEVNT, TIMER1_VALUE);
    // Enable CCP as compare: at trigger interrupt + Timer1 clear
    T3CONbits.T3CCP1 = 0; // Timer1 is the clock source for compare
    IPR1bits.CCP1IP = 1; // CCP1 Interrupt Priority set to high

    INTCONbits.GIEH = 1; // Enables all interrupts

    while (1); // Do nothing, forever
}