PIC12F615 PWM example on AF pin GP5

pic12f615.c

#include "xc.h"
#include "config.h"

#define _XTAL_FREQ 8000000

/* Variables */
unsigned int i;

void setDuty(unsigned int duty) {
    CCPR1L = duty >> 2;
    CCP1CON &= 0xCF;
    CCP1CON |= (0x30 & (duty << 4));
}

void main(void) {

    /* CONFIGURE GPIO */
    ANSEL = 0;      // disable analog
    TRISA = 0;      // disable pin

    /* CONFIGURE PWM on GPIO5 */
    // Pin configuration
    GP5 = 0;        // GP5 put low
    TRISIO5 = 0;    // GP5 as output
    P1ASEL = 1;     // GP5 as AF > P1A (PWM)
    // Configure PWM
    T2CONbits.T2CKPS = 0b00;    // set prescaler as 1:1 (default)
    CCP1CONbits.P1M = 0;        // single / P1A modulated
    CCP1CONbits.CCP1M = 0b1100; // set PWM mode 
    // Timer configuration
    TMR2 = 0;       // reset TMR2 count
    TMR2ON = 1;     // enable TMR2, start PWM


    while(1) {
        for(i = 0; i < 255; i++) {
            setDuty(i);
            __delay_ms(10);
        }
    }
}