#include <reg51.h>
sfr DACDATA = P1
void main()
  {
    unsigned char WAVEVALUE[12] = {128,192,238,255,
                                238,192,128,64,
                                17,0,17,64}
    unsigned char x
    while(1)
      {
      for(x=0
       {
        DACDATA = WAVEVALUE[x]
       }
      }
  }