Bodmer/TFT_eSPI
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Add touch pressure hysterisis and user defined sensitivity

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getTouch accepts a third optional pressure threshold, default is 600,
increasing means harder presses are needed.
getTouch(uint16_t *x, uint16_t *y, uint16_t threshold = 600);
This commit is contained in:
Bodmer
2017-12-21 23:16:11 +00:00
parent 170473b3e4
commit 2e84218ecb
4 changed files with 25 additions and 9 deletions
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26
TFT_eSPI.cpp
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@@ -4114,10 +4114,22 @@ uint8_t TFT_eSPI::validTouch(uint16_t *x, uint16_t *y, uint16_t threshold){
** Description: read callibrated position. Return false if not pressed.
***************************************************************************************/
#define Z_THRESHOLD 350 // Touch pressure threshold for validating touches
uint8_t TFT_eSPI::getTouch(uint16_t *x, uint16_t *y){
uint8_t TFT_eSPI::getTouch(uint16_t *x, uint16_t *y, uint16_t threshold){
uint16_t x_tmp, y_tmp, xx, yy;
if(!validTouch(&x_tmp, &y_tmp, Z_THRESHOLD)) return false;
if (threshold<20) threshold = 20;
if (_pressTime > millis()) threshold=20;
byte n = 5;
byte valid = 0;
while (n--)
{
if (validTouch(&x_tmp, &y_tmp, threshold)) valid++;;
}
if (valid<1) { _pressTime = 0; return false; }
_pressTime = millis() + 50;
if(!touchCalibration_rotate){
xx=(x_tmp-touchCalibration_x0)*_width/touchCalibration_x1;
@@ -4135,11 +4147,13 @@ uint8_t TFT_eSPI::getTouch(uint16_t *x, uint16_t *y){
yy = _height - yy;
}
if (xx >= _width || yy >= _height) return false;
if (xx >= _width || yy >= _height) return valid;
*x = xx;
*y = yy;
return true;
_pressX = xx;
_pressY = yy;
*x = _pressX;
*y = _pressY;
return valid;
}
/***************************************************************************************

4
TFT_eSPI.h
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@@ -458,7 +458,7 @@ class TFT_eSPI : public Print {
// These are associated with the Touch Screen handlers
uint8_t getTouchRaw(uint16_t *x, uint16_t *y);
uint16_t getTouchRawZ(void);
uint8_t getTouch(uint16_t *x, uint16_t *y);
uint8_t getTouch(uint16_t *x, uint16_t *y, uint16_t threshold = 600);
void calibrateTouch(uint16_t *data, uint32_t color_fg, uint32_t color_bg, uint8_t size);
void setTouch(uint16_t *data);
@@ -488,6 +488,8 @@ class TFT_eSPI : public Print {
// Initialise with example calibration values so processor does not crash if setTouch() not called in setup()
uint16_t touchCalibration_x0 = 300, touchCalibration_x1 = 3600, touchCalibration_y0 = 300, touchCalibration_y1 = 3600;
uint8_t touchCalibration_rotate = 1, touchCalibration_invert_x = 2, touchCalibration_invert_y = 0;
uint32_t _pressTime;
uint16_t _pressX, _pressY;
protected:

2
library.json
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@@ -1,6 +1,6 @@
{
"name": "TFT_eSPI",
"version": "0.17.19",
"version": "0.17.20",
"keywords": "TFT, ESP8266, NodeMCU, ESP32, ILI9341, ST7735, ILI9163, S6D02A1, ILI9486",
"description": "A TFT SPI graphics library for ESP8266",
"repository":

2
library.properties
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@@ -1,5 +1,5 @@
name=TFT_eSPI
version=0.17.19
version=0.17.20
author=Bodmer
maintainer=Bodmer
sentence=A fast TFT library for ESP8266 processors and the Arduino IDE