void FillCircle(unsigned char x0, unsigned char y0, unsigned char radius, unsigned int color)
{
   char f = 1 - radius;
   char ddF_x = 0;
   char ddF_y = -2 * radius;
   char x = 0;
   char y = radius;
	   S65_DrawLine(x0,y0 - radius,x0,y0 + radius, color);
	   S65_DrawLine(x0 - radius, y0, x0 + radius, y0, color);
   while(x < y)
   {
     if(f >= 0)
     {
       y--;
       ddF_y += 2;
       f += ddF_y;
     }
     x++;
     ddF_x += 2;
     f += ddF_x + 1;
		 S65_DrawLine(x0 + x, y0 - y, x0 + x, y0 + y,color);
		 S65_DrawLine(x0 + y, y0 - x, x0 + y, y0 +x,color);
		 S65_DrawLine(x0 - x, y0 -y, x0 - x, y0 + y,color);
		 S65_DrawLine(x0 - y, y0 -x, x0 - y, y0 + x,color);
   }
}