NerdNos-Firmware/lib/TFT_eSPI/TFT_Drivers/ILI9163_Rotation.h

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// This is the command sequence that rotates the ILI9163 driver coordinate frame
rotation = m % 4;
writecommand(TFT_MADCTL);
switch (rotation) {
case 0:
writedata(TFT_MAD_MX | TFT_MAD_MY | TFT_MAD_BGR);
_width = _init_width;
_height = _init_height;
#ifdef CGRAM_OFFSET
colstart = 0;
rowstart = 0;
#endif
break;
case 1:
writedata(TFT_MAD_MV | TFT_MAD_MY | TFT_MAD_BGR);
_width = _init_height;
_height = _init_width;
#ifdef CGRAM_OFFSET
colstart = 0;
rowstart = 0;
#endif
break;
case 2:
writedata(TFT_MAD_BGR);
_width = _init_width;
_height = _init_height;
#ifdef CGRAM_OFFSET
colstart = 0;
rowstart = 32;
#endif
break;
case 3:
writedata(TFT_MAD_MX | TFT_MAD_MV | TFT_MAD_BGR);
_width = _init_height;
_height = _init_width;
#ifdef CGRAM_OFFSET
colstart = 32;
rowstart = 0;
#endif
break;
}