Bodmer/TFT_eSPI
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Improved touch detection and position reliability

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Bodmer
2017-10-25 01:41:01 +01:00
parent 94520c4071
commit df4e658fe4
1 changed files with 30 additions and 21 deletions
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51
TFT_eSPI.cpp
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@@ -3735,24 +3735,29 @@ uint16_t TFT_eSPI::getTouchRawZ(void){
uint8_t TFT_eSPI::validTouch(uint16_t *x, uint16_t *y, uint16_t threshold){
uint16_t x_tmp, y_tmp, x_tmp2, y_tmp2;
// Wait until pressure stops increasing
uint16_t z1 = 1;
uint16_t z2 = 0;
while (z1 > z2)
{
z2 = z1;
z1 = getTouchRawZ();
delay(1);
}
// uint16_t z_tmp = getTouchRawZ(); // Save value for debug message
// Debug messages used for tuning
// Serial.print("Z = ");Serial.println(z_tmp);
if (getTouchRawZ() <= threshold) return false;
delay(2); // Small debounce delay to the next sample
// Serial.print("Z = ");Serial.println(z1);
if (z1 <= threshold) return false;
getTouchRaw(&x_tmp,&y_tmp);
// z_tmp = getTouchRawZ();
// Serial.print("Sample 1 x,y = "); Serial.print(x_tmp);Serial.print(",");Serial.print(y_tmp);
// Serial.print(", Z = ");Serial.println(z_tmp);
// Serial.print(", Z = ");Serial.println(z1);
delay(2); // Small debounce delay to the next sample
delay(1); // Small delay to the next sample
if (getTouchRawZ() <= threshold) return false;
delay(2); // Small debounce delay to the next sample
delay(2); // Small delay to the next sample
getTouchRaw(&x_tmp2,&y_tmp2);
// Serial.print("Sample 2 x,y = "); Serial.print(x_tmp2);Serial.print(",");Serial.println(y_tmp2);
@@ -3771,28 +3776,32 @@ uint8_t TFT_eSPI::validTouch(uint16_t *x, uint16_t *y, uint16_t threshold){
** Function name: getTouch
** Description: read callibrated position. Return false if not pressed.
***************************************************************************************/
#define Z_THRESHOLD 0x200 // Touch pressure threshold for validating touches
#define Z_THRESHOLD 350 // Touch pressure threshold for validating touches
uint8_t TFT_eSPI::getTouch(uint16_t *x, uint16_t *y){
uint16_t x_tmp, y_tmp;
uint16_t x_tmp, y_tmp, xx, yy;
if(!validTouch(&x_tmp, &y_tmp, Z_THRESHOLD)) return false;
if(!touchCalibration_rotate){
*x=(x_tmp-touchCalibration_x0)*_width/touchCalibration_x1;
*y=(y_tmp-touchCalibration_y0)*_height/touchCalibration_y1;
xx=(x_tmp-touchCalibration_x0)*_width/touchCalibration_x1;
yy=(y_tmp-touchCalibration_y0)*_height/touchCalibration_y1;
if(touchCalibration_invert_x)
*x = _width - *x;
xx = _width - xx;
if(touchCalibration_invert_y)
*y = _height - *y;
yy = _height - yy;
} else {
*y=(x_tmp-touchCalibration_x0)*_height/touchCalibration_x1;
*x=(y_tmp-touchCalibration_y0)*_width/touchCalibration_y1;
yy=(x_tmp-touchCalibration_x0)*_height/touchCalibration_x1;
xx=(y_tmp-touchCalibration_y0)*_width/touchCalibration_y1;
if(touchCalibration_invert_x)
*x = _width - *x;
xx = _width - xx;
if(touchCalibration_invert_y)
*y = _height - *y;
yy = _height - yy;
}
if (xx >= _width || yy >= _height) return false;
*x = xx;
*y = yy;
return true;
}