PIC16F877A PWM

#include<pic.h>
#include<htc.h>
#define __PIC16F877AH
#define _XTAL_FREQ   2000000

__CONFIG(PWRTE_ON & FOSC_HS & LVP_OFF & WDTE_OFF);

unsigned int a=0;

void InitPWM(void);
void SetPWMDutyCycle(unsigned int l);

void delay(unsigned int i)
{
while(i--);
}



void InitPWM(void)
{
TRISC2  = 0;            // Make CCP1 pin as output
CCP1CON = 0x0C;         // Configure CCP1 module in PWM mode

PR2   = 0xFF;           // Configure the Timer2 period
T2CON = 0x01;           // Set Prescaler to be 4, hence PWM frequency is set to 4.88KHz.

SetPWMDutyCycle(0);     // Intialize the PWM to 0 duty cycle

T2CON |= 0x04;          // Enable the Timer2, hence enable the PWM.
}



void SetPWMDutyCycle(unsigned int l) // Give a value in between 0 and 1024 for DutyCycle
{
CCPR1L   = l>>2;         // Put MSB 8 bits in CCPR1L
CCP1CON &= 0xCF;                 // Make bit4 and 5 zero
CCP1CON |= (0x30&(l<<4));   // Assign Last 2 LSBs to CCP1CON
}

void main(void)
{
InitPWM();

while(1)
{
     SetPWMDutyCycle(a);   //50% duty cycle
     a++;
     if(a>1000)
      a=0;
}
}