TOAY i am using pic16f877a microcontroller to generate 10bit pwm
#pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)
#pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT disabled)
#pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled)
#pragma config BOREN = OFF // Brown-out Reset Enable bit (BOR disabled)
#pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming)
#pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off; all program memory may be written to by EECON control)
#pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off)
// #pragma config statements should precede project file includes.
// Use project enums instead of #define for ON and OFF.
#include <xc.h>
#define _XTAL_FREQ 20000000
int main()
{
int i = 0;
TRISC = 0x00; // Configure PORTC as output(RC2-PWM1, RC1-PWM2)
PR2 = (_XTAL_FREQ/(50000*4*4)) - 1; //Setting the PR2 formulae using Datasheet // Makes the PWM work in 5KHZ
CCP1M3 = 1; CCP1M2 = 1; //Configure the CCP1 module
T2CKPS0 = 1;T2CKPS1 = 0; TMR2ON = 1; //Configure the Timer module
TRISC2 = 0; // make port pin on C as output
while (1)
{
for (i = 0; i<100; i++) // Keep increasing the dutyCyle to increase the brightness of LED
{
CCP1X = i & 1; //Store the 1st bit
CCP1Y = i & 2; //Store the 0th bit
CCPR1L = i>>2;// Store the remining 8 bit
__delay_ms(100);
}
for (i = 100; i>1;i--) // Keep reducing the dutyCyle to decrease the brightness of LED
{
CCP1X = i &1; //Store the 1st bit
CCP1Y = i & 2; //Store the 0th bit
CCPR1L = i>>2;//
__delay_ms(100);
}
}
}