#include <p18F458.h>
rom const unsigned char WAVEVALUE[12] ={128,192,238,255,
                238,192,128,64,
                17,0,17,64};
void main()
  {
    unsigned char x;
    TRISB=0;
    while(1)
      {
      for(x=0;x<12;x++)
       PORTB = WAVEVALUE[x];
      }
  }