/elec/propeller-clock

/*

 *      This program is free software; you can redistribute it and/or modify

 *      it under the terms of the GNU General Public License as published by

 *      the Free Software Foundation; either version 2 of the License, or

 *      (at your option) any later version.

 *      

 *      This program is distributed in the hope that it will be useful,

 *      but WITHOUT ANY WARRANTY; without even the implied warranty of

 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *      GNU General Public License for more details.

 *      

 *      You should have received a copy of the GNU General Public License

 *      along with this program; if not, write to the Free Software

 *      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

 *      MA 02110-1301, USA.

 */

/*  * * * * * * * * * * * * * * * * * * * * * * * * * * * 

 Main code by Thomas O Fredericks

 Rebounce and duration functions contributed by Eric Lowry

 Write function contributed by Jim Schimpf

 risingEdge and fallingEdge contributed by Tom Harkaway

* * * * * * * * * * * * * * * * * * * * * * * * * * * * */

#ifndef Bounce_h

#define Bounce_h

#include <inttypes.h>

class Bounce

{

public:

	// Initialize

  Bounce(uint8_t pin, unsigned long interval_millis ); 

	// Sets the debounce interval

  void interval(unsigned long interval_millis); 

	// Updates the pin

	// Returns 1 if the state changed

	// Returns 0 if the state did not change

  int update(); 

	// Forces the pin to signal a change (through update()) in X milliseconds 

	// even if the state does not actually change

	// Example: press and hold a button and have it repeat every X milliseconds

  void rebounce(unsigned long interval); 

	// Returns the updated pin state

  int read();

	// Sets the stored pin state

  void write(int new_state);

    // Returns the number of milliseconds the pin has been in the current state

  unsigned long duration();

    // The risingEdge method is true for one scan after the de-bounced

    // input goes from off-to-on.

  bool risingEdge();

    // The fallingEdge method it true for one scan after the

    // de-bounced input goes from on-to-off.

  bool fallingEdge();

protected:

  int debounce();

  unsigned long  previous_millis, interval_millis, rebounce_millis;

  uint8_t state;

  uint8_t pin;

  uint8_t stateChanged;

};

#endif