TftTouchGetCoordinates()

Syntax

TftTouchGetCoordinates(pMode As Bit), Bit

Parameters

Overview

This procedure returns the Touch-to-Screen equivalent coordinates, which are placed into two global variables: wTouchToPointX and wTouchToPointY.

Low Pass Filter vs. No Filter:

• Low Pass Filter: Using the low pass filter results in slower but more accurate touch readings. It smooths out the ADC noise, making the results more reliable.
• No Low Pass Filter: Skipping the low pass filter provides faster touch readouts, but with potentially reduced accuracy.

Low Pass Filter Mechanics:

• When a touch event is detected that exceeds the minimum pressure threshold in the Z direction (Z_Threshold), a number of samples (TouchAveragePoints) are taken.
• X and Y are processed independently. Samples farther than TouchMedianDistance from the median for that axis are discarded.
• The remaining samples for each axis are averaged to produce the final coordinates.

The return value indicates whether a touch reading was obtained and the calibrated coordinates are within the usable screen bounds.

Example

TftTouchGetCoordinates(1)

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