#include <18F4520.h>
#use delay (clock = 20000000)
#fuses HS, NOWDT, NOLVP

int *ADCON1 = 0xFC1, *TRISB = 0xF93, *TRISC = 0xF94;
int *PORTB = 0xF81, *PORTC = 0xF82;

MAIN(){
  int X;
  *ADCON1 = 0xFC;
  *TRISB = 0x01;
  *TRISC = 0x00;
  *PORTC = 0x01;
  while(1){
    if( *PORTB & 0x01){
      if( x == 255)
        x = 100;
      else
        x = 255;
    }
    while( *PORTC < 0x80){
      *PORTC = *PORTC<<1;
      delay_ms(x);
    }
    while( *PORTC > 0x01){
      *PORTC = *PORTC>>1;
      delay_ms(x);
    }
  }
}