sbit UP at RA0_bit;
sbit DOWN at RA1_bit;
 unsigned short new_DC, current_DC;

 void main() {
 adcon1 = 0x07;
 TRISA = 0b00000111; // RA0, RA1 input, RA3
 TRISB = 0;
 portb=0;
 TRISC = 0;
 portc=0;
 PWM1_Init(500);    // PWM module initialization (500Hz)
 new_DC = 0;         // Initial value of variable Duty Cycle
 current_DC = 0;
 PWM1_Start();       // Start PWM1 module with Zero DC
 PWM1_Set_Duty(current_DC);
 do {
  if (!UP){      // If the button connected to RB0 is pressed
   Delay_ms(300);
   portb.f1=1;
   portb.f2=0;
   if (new_DC < 250)      // Don't go above 250
   new_DC = new_DC + 50 ; // increment Duty Cycle by 50
  }
    // If the button connected to RB1 is pressed
  if(!DOWN )  {
   Delay_ms(300);
     portb.f1=0;
     portb.f2=1;
   if (new_DC !=0)        // Don't go below 0
   new_DC= new_DC - 50 ; // Decrement Duty Cycle by 25
}
  if (current_DC != new_DC) {
   current_DC = new_DC ;
   PWM1_Set_Duty(current_DC); // Change the current DC to new value
  }
  if(porta.f2==0){
     portb.f1=0;
     portb.f2=0;
}
 } while(1);
}  // END main()