keyboard/qmk/lib/ugfx/drivers/ginput/touch/STMPE811/readme.txt

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This driver has a number of optional settings which can be specified in gfxconf.h:
#define GMOUSE_STMPE811_READ_PRESSURE GFXON
Returns pressure values when the touch is down. On tested boards this ranges from 90 to 150. 255 is touch off.
#define GMOUSE_STMPE811_SELF_CALIBRATE GFXON
Scale the touch readings to avoid calibration. This is not as accurate as real calibration.
#define GMOUSE_STMPE811_TEST_MODE GFXON
Return raw readings for diagnostic use with the "touch_raw_readings" tool.