Conditional inclusion of touch features

Ensure touch features are only included on ESP32 variants that supports touch. Relies on include/soc/soc_caps.h in recent versions of the IDF

Author: ncmreynolds

src/EasyButtonTouch.cpp

@@ -7,6 +7,7 @@
 
 #if defined(ESP32)
 #include "EasyButtonTouch.h"
+#if defined(SOC_TOUCH_SENSOR_SUPPORTED)
 
 void EasyButtonTouch::setThreshold(int threshold)
 {
@@ -33,5 +34,5 @@ bool EasyButtonTouch::_readPin()
 	ADCFilter.Filter(touchRead(_pin));
 	return ADCFilter.Current() < _touch_threshold;
 }
-
+#endif
 #endif

src/EasyButtonTouch.h

@@ -7,6 +7,8 @@
 
 #if !defined(_EasyButtonTouch_h) and defined(ESP32)
 #define _EasyButtonTouch_h
+#include <include/soc/soc_caps.h>
+#if defined(SOC_TOUCH_SENSOR_SUPPORTED)
 
 #include <Arduino.h>
 #include <Filter.h>
@@ -26,5 +28,5 @@ class EasyButtonTouch : public EasyButton
 
 	bool _readPin();
 };
-
+#endif
 #endif