int x=55;
void main()
 {cmcon=07;
 trisa=15;trisb.f3=0;portb.f3=0;
  pwm1_init(5000);
  while(1)
         {if(porta==1){while(porta==1){}
                       pwm1_set_duty(x);
                       pwm1_start();
                      }
          else if(porta==2){while(porta==2){}
                      pwm1_stop();
                      }
          else if(porta==4){while(porta==4){x+=10;
                                            if(x>255)x=255;
                                            pwm1_set_duty(x);
                                            delay_ms(1000);
                                           }
                           }
          else if(porta==8){while(porta==8){x-=10;
                                            if(x<55)x=55;
                                            pwm1_set_duty(x);
                                            delay_ms(1000);
                                           }


                           }
         }

}

int x=55;
void main()
 {cmcon=07;
 trisa=15;trisb.f3=0;portb.f3=0;
  pwm1_init(5000);
  while(1)
         {if(porta.f0==0){while(porta.f0==0){}
                       pwm1_set_duty(x);
                       pwm1_start();
                      }
          else if(porta.f1==0){while(porta.f1==0){}
                      pwm1_stop();
                      }
          else if(porta.f2==0){while(porta.f2==0){x+=10;
                                            if(x>255)x=255;
                                            pwm1_set_duty(x);
                                            delay_ms(500);
                                           }
                           }
          else if(porta.f3==0){while(porta.f3==0){x-=10;
                                            if(x<55)x=55;
                                            pwm1_set_duty(x);
                                            delay_ms(500);
                                           }


                           }
         }

}