TFT_Drivers/ST7789_Rotation.h

  // This is the command sequence that rotates the ST7789 driver coordinate frame

  writecommand(TFT_MADCTL);
  rotation = m % 4;
  switch (rotation) {
    case 0: // Portrait
#ifdef CGRAM_OFFSET
      if (_init_width == 135)
      {
        colstart = 52;
        rowstart = 40;
      }
      else if(_init_height == 280)
      {
        colstart = 0;
        rowstart = 20;
      }
      else if(_init_width == 172)
      {
        colstart = 34;
        rowstart = 0;
      }
      else if(_init_width == 170)
      {
        colstart = 35;
        rowstart = 0;
      }
      else
      {
        colstart = 0;
        rowstart = 0;
      }
#endif
      writedata(TFT_MAD_COLOR_ORDER);

      _width  = _init_width;
      _height = _init_height;
      break;

    case 1: // Landscape (Portrait + 90)
#ifdef CGRAM_OFFSET
      if (_init_width == 135)
      {
        colstart = 40;
        rowstart = 53;
      }
      else if(_init_height == 280)
      {
        colstart = 20;
        rowstart = 0;
      }
      else if(_init_width == 172)
      {
        colstart = 0;
        rowstart = 34;
      }
      else if(_init_width == 170)
      {
        colstart = 0;
        rowstart = 35;
      }
      else
      {
        colstart = 0;
        rowstart = 0;
      }
#endif
      writedata(TFT_MAD_MX | TFT_MAD_MV | TFT_MAD_COLOR_ORDER);

      _width  = _init_height;
      _height = _init_width;
      break;

      case 2: // Inverter portrait
#ifdef CGRAM_OFFSET
      if (_init_width == 135)
      {
        colstart = 53;
        rowstart = 40;
      }
      else if(_init_height == 280)
      {
        colstart = 0;
        rowstart = 20;
      }
      else if(_init_width == 172)
      {
        colstart = 34;
        rowstart = 0;
      }
      else if(_init_width == 170)
      {
        colstart = 35;
        rowstart = 0;
      }
      else
      {
        colstart = 0;
        rowstart = 80;
      }
#endif
      writedata(TFT_MAD_MX | TFT_MAD_MY | TFT_MAD_COLOR_ORDER);

      _width  = _init_width;
      _height = _init_height;
       break;
    case 3: // Inverted landscape
#ifdef CGRAM_OFFSET
      if (_init_width == 135)
      {
        colstart = 40;
        rowstart = 52;
      }
      else if(_init_height == 280)
      {
        colstart = 20;
        rowstart = 0;
      }
      else if(_init_width == 172)
      {
        colstart = 0;
        rowstart = 34;
      }
      else if(_init_width == 170)
      {
        colstart = 0;
        rowstart = 35;
      }
      else
      {
        colstart = 80;
        rowstart = 0;
      }
#endif
      writedata(TFT_MAD_MV | TFT_MAD_MY | TFT_MAD_COLOR_ORDER);

      _width  = _init_height;
      _height = _init_width;
      break;
  }