My Thesis

How to use the Double Frame Buffer ...

 ///*
 for( Yin = 0; Yin < 480; Yin++)
  {
  for( Xin = 0; Xin < 640; Xin++)
   {
  // if( Yin == 0  Xin == 0  Xin == 639  Yin == 479)
  //  PalFrameBufferDBWrite(FBPtr, Xin, Yin, 0x00FFFF);
  
   PalFrameBufferDBWrite(FBPtr, Xin, Yin, 0xFFFFFF);
   }
  }
 //*/

 PalFrameBufferDBSwapBuffers(FBPtr);
 for( Yin = 0; Yin < 480; Yin++)
  {
  for( Xin = 0; Xin < 640; Xin++)
   {
   PalFrameBufferDBWrite(FBPtr, Xin, Yin, 0x00FF00);

   if( Yin == 0  Xin == 0  Xin == 639  Yin == 479)
   //if( Yin == 0 )
    PalFrameBufferDBWrite(FBPtr, Xin, Yin, 0xFFFFFF);
   }
  }

 PalFrameBufferDBSwapBuffers(FBPtr);

You must run a "dummy" loop (first two-for-loops) to sort of inititalize the frame buffer. The second framebuffer will work correctly. Failure to do so will cause undefined behaviour stuff.