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This driver has a number of optional settings which can be specified in gfxconf.h:

#define GMOUSE_STMPE811_READ_PRESSURE       TRUE
	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      TRUE
	Scale the touch readings to avoid calibration. This is not as accurate as real calibration.
	
#define GMOUSE_STMPE811_TEST_MODE           TRUE
	Return raw readings for diagnostic use with the "touch_raw_readings" tool.