PWM control using push buttons

I am new to microcontroller. I am going to build my first project "Push button controlled PWM" using PIC12F675 for dimming of LED.

I want to control the duty cycle of 100Hz pulse from 0-100%.
Two push buttons, one for increment and another for decrement of duty cycle.
Resolution required is in steps of 2%.

Kindly help me with code.


Thx.
ashwal.patel@gmail.com

infact this this the coding for dc motor control using PWM with increment and decrement key just try with this u may get some idea

#include<pic.h>
#include"delay.c"

__CONFIG(0x1932);

void PWM_INIT();
void PWM_ON(unsigned int);
void PWM_OFF();
void PWM_INC();

static unsigned int inc;
unsigned int pwm;

void main()
{
TRISB=0x0F;
RB4=0;
RB7=0;
RBPU=0;

PWM_INIT();
inc=1;
DelayMs(10);
while(1)
{
if(RB0==0)
{
DelayMs(3);
if(RB0==0)
{
RB7=1;
if(inc<23)
inc++;
}
}
if(RB1==0)
{
DelayMs(3);
if(RB1==0)
{
RB7=1;
if(inc>1)
inc--;
}
}

if(RB2==0)
{
DelayMs(5);
if(RB2==0){
pwm = (inc * 6) + 60;
PWM_ON(pwm);
}
}
if(RB3==0)
{
DelayMs(5);
if(RB3==0)
{
PWM_OFF();
RB7=0;
DelayMs(5);
PWM_INIT();
}
}
}
}


void PWM_INIT()
{
TRISC1 = TRISC2 = 0;
RC1 = RC2 = 0;
PR2 = 199;
CCPR2L = 0;
CCP2CON = 0x0C;
T2CON = 0x06;
}

void PWM_ON(unsigned int val)
{
CCPR2L=val;
}
void PWM_OFF(){
CCP2CON = 0x00;
if(PR2) PR2 = 0;
if(CCPR2L) CCPR2L =0;
TMR2ON = 0;
RC1 = 0;
}