Added button.cpp

Author: CircuitsFun

src/Button.cpp

@@ -0,0 +1,71 @@
+#include "CircuitsFunBasic.h"
+#if ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
+
+Button::Button(int pin,bool pressedValue){
+	this->pin=pin;
+	this->pressedValue=pressedValue;
+	this->debounceTime=0;
+}
+void Button::begin(){
+	//Must be called in setup
+	pinMode(pin,INPUT);
+}
+bool Button::pressed(int timeout){
+	//from unpressed to pressed
+	return checkPress(timeout,pressedValue);
+}
+bool Button::released(int timeout){
+	//from pressed to unpressed
+	return checkPress(timeout,!pressedValue);
+}
+bool Button::doublePressed(int timeout,int tolerance){
+	//two clicks within tolerance time
+	if(pressed(timeout)){
+		return pressed(tolerance);
+	}else{
+		return false;
+	}
+}
+
+bool Button::isPressed(){
+	bool state=getState();
+	bool result=false;
+	if(state!=lastState && state==HIGH){
+		result=true;
+	}
+	lastState=state;
+
+	return result;
+}
+
+
+bool Button::checkPress(int timeout,bool requiredState){
+	//help function, check if the button has changed
+	//from not "requiredState" to "requiredState" within timeout
+	unsigned long timer=millis();
+	bool iStart=false;
+
+	do{
+		if(!iStart){
+			if(getState()!=requiredState){
+				iStart=true;
+			}
+		}else{
+			if(getState()==requiredState){
+				delay(debounceTime);
+				return true;
+			}
+		}
+		//delay(10);
+	}while(millis()-timer<=(unsigned long)timeout || timeout==0 );
+
+	return false;
+}
+
+bool Button::getState(){
+	return digitalRead(pin);
+}