TouchCalibration Struct Reference

Linear calibration mapping raw ADC counts from a resistive touch panel into screen pixel coordinates. More...

#include <touch.h>

Public Member Functions
void	apply (int16_t rawX, int16_t rawY, int16_t &outX, int16_t &outY) const
	Apply the calibration to a pair of raw ADC samples. More...

Public Attributes
int16_t	xMin = 200
int16_t	xMax = 3900
int16_t	yMin = 200
int16_t	yMax = 3900
uint16_t	screenWidth = 320
uint16_t	screenHeight = 240
bool	swapXY = false
bool	invertX = false
bool	invertY = false

Detailed Description

Linear calibration mapping raw ADC counts from a resistive touch panel into screen pixel coordinates.

The mapping is a per-axis affine transform:

screenX = (raw - rawMin) * screenW / (rawMax - rawMin)
screenY = (raw - rawMin) * screenH / (rawMax - rawMin)

with optional axis swap and per-axis inversion to handle different physical mountings of the touch panel relative to the display.

Definition at line 50 of file touch.h.

Member Function Documentation

apply()

void TouchCalibration::apply ( int16_t  rawX, int16_t  rawY, int16_t &  outX, int16_t &  outY  ) const

inline

Apply the calibration to a pair of raw ADC samples.

The result is clamped to [0, screenWidth-1] and [0, screenHeight-1]. Returns x and y by reference.

Definition at line 68 of file touch.h.

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The documentation for this struct was generated from the following file:

• src/touch/touch.h