S3R8TX/lib/TFT_eSPI/TFT_Drivers/ILI9481_Rotation.h

  // This is the command sequence that rotates the ILI9481 driver coordinate frame

  writecommand(TFT_MADCTL);
  rotation = m % 4;
  switch (rotation) {
   case 0: // Portrait
     writedata(TFT_MAD_BGR | TFT_MAD_SS);
      _width  = TFT_WIDTH;
      _height = TFT_HEIGHT;
     break;
   case 1: // Landscape (Portrait + 90)
     writedata(TFT_MAD_MV | TFT_MAD_BGR);
      _width  = TFT_HEIGHT;
      _height = TFT_WIDTH;
     break;
   case 2: // Inverter portrait
     writedata(TFT_MAD_BGR | TFT_MAD_GS);
      _width  = TFT_WIDTH;
      _height = TFT_HEIGHT;
     break;
   case 3: // Inverted landscape
     writedata(TFT_MAD_MV | TFT_MAD_BGR | TFT_MAD_SS | TFT_MAD_GS);
      _width  = TFT_HEIGHT;
      _height = TFT_WIDTH;
     break;
  }