unsigned int* punt;

void main (void)
{

      punt=(unsigned int *) 0x40021014;
      *punt |= 1<<17;                    //IOPA enable
      *punt |= 1<<21;                    //IOPE enable


      punt=(unsigned int *) 0x48001000;
      *punt |=0x55550000;


      punt=(unsigned int *) 0x48000000;
      *punt &= -((unsigned int)3);


      while(1)
      {

      punt=(unsigned int *) 0x48000010;

        if ((*punt&0x1)==0x1)
        {

          punt = (unsigned int*) 0x48001014;
            *punt = 255<<8;
        }
        else
        {
          punt=(unsigned int*) 0x48001014;
            *punt=0<<8;
        }
      }
}