/*----------------------------------------------------------------------*
 * button.h -- Library for reading momentary contact switches like		*
 * tactile button switches.												*
 *																		*
 * Jack Christensen 11 May 2011											*
 *                                                                      *
 * This work is licensed under the Creative Commons Attribution-        *
 * ShareAlike 3.0 Unported License. To view a copy of this license,     *
 * visit http://creativecommons.org/licenses/by-sa/3.0/ or send a       *
 * letter to Creative Commons, 171 Second Street, Suite 300,            *
 * San Francisco, California, 94105, USA.                               *
 *----------------------------------------------------------------------*/
#ifndef button_h
#define button_h
#include "WProgram.h"
class button
{
	public:
		button(uint8_t pin, uint8_t puEnabled, uint8_t invert, uint32_t dbTime);
		uint8_t read();
		uint8_t isPressed();
		uint8_t isReleased();
		uint8_t wasPressed();
		uint8_t wasReleased();
		uint8_t pressedFor(uint32_t ms);
		uint8_t releasedFor(uint32_t ms);
		uint32_t lastChange();
	private:
		uint8_t _pin;			//arduino pin number
		uint8_t _puEnabled;		//internal pullup resistor enabled
		uint8_t _invert;		//if 0, interpret high state as pressed, else interpret low state as pressed
		uint8_t _state;			//current button state
		uint8_t _lastState;		//previous button state
		uint8_t _changed;		//state changed since last read
		uint32_t _time;			//time of current state (all times are in ms)
		uint32_t _lastTime;		//time of previous state
		uint32_t _lastChange;	//time of last state change
		uint32_t _dbTime;		//debounce time
};
#endif