PWM.rar_16f877a pwm_pic 16f877a pwm_pic pwm

#include<pic.h> void delay(void); void pwm_duty_cycle(void); unsigned long int pwm_10=0xffffffff; void main(void) { unsigned int MSB=0,LSB=0x3c,i=0; T2CON=0X07; // SET PRESCALE VALUE AND RUN TIMER2. PR2=0XAB; // Set the PWM period CCP1CON |= 0x0C; // SET PWM MODE PORTC=0X00; // Make the CCP1 pin an output(RC2) CCP1CON = LSB; CCPR1L = MSB; TMR2ON = 1; while(1) { //delay(); pwm_duty_cycle(); } } void delay(void) { unsigned int i=0,j; // for(j=0;j<1234;j++) for(i=0;i<1234;i++); } void pwm_duty_cycle(void) { unsigned char pwm_msb,pwm_lsb; unsigned long int pwm_msb_dummy; //delay(); // pwm_10=~pwm_10; pwm_msb_dummy = ( pwm_10 & 0x3fc); // 11 1111 1100 split the 8 msb pwm_msb_dummy = (pwm_msb_dummy >> 2); // 2 bit right shift to get 1111 1111 pwm_msb = pwm_msb_dummy; pwm_lsb = ( pwm_10 & 0x003); pwm_lsb = ( pwm_lsb << 4 ); pwm_lsb = ( pwm_lsb | 0x0c ); PR2 = 0xab; CCP1CON = pwm_lsb; CCPR1L = pwm_msb; T2CON = 0b00000111; }