File content as of revision 0:8625b4741933:

#include "button.h"
#include "mbed.h"


/******************************************************************************/
// constructor
/******************************************************************************/
button::button(PinName pBtn, PinMode  pBtnMode)
{
    pin = new DigitalIn(pBtn, pBtnMode);
    init();
}


/******************************************************************************/
// initialisation
/******************************************************************************/
void button::init()
{
    bIsPressed   = false;
    bWasPressed = false;
    bNewState   = false;
    bOldState   = false;

    bBtnNewAction = false;

    iNumCycle = 0;

    return;
}


/******************************************************************************/
// query the button with debouncing
//      - bNewState:        current state of button
//      - bOldState:        previous state of button
//      - bBtnNewAction:    flag, if an action is occur
//      - iNumCycle:        cycle counter of same state
//      - NUNCYCLES:        max. value of cycle counter
/******************************************************************************/
void button::polling()
{

  
    bOldState   = bNewState;
    bNewState   = (bool)pin->read();
    bWasPressed = false;     
        
    if( !bBtnNewAction and (bOldState != bNewState) ) {                         // if there is a action (changing signal) on the button (btn), then rise the flag bBtnNewAction
        bBtnNewAction = true;       
    }



    if(bBtnNewAction) {                                                         // if flag ist true (new action on the button)

        if(bOldState == bNewState) {                                            // if current state equals previous state
            if(iNumCycle <= NUMCYCLE) {                                         // count the number of cycle unless the max. value is reached
                iNumCycle++;

            } else if(iNumCycle > NUMCYCLE) {                                   // else if the max. value is reached
                iNumCycle = 0;                                                  // reset the counter, there is no action any more expected
                bBtnNewAction = false;

                if(bNewState == PRESSED) {
                    bIsPressed = true;

                } else if(bNewState == NOT_PRESSED) {
                
                    if(bIsPressed == true)
                        bWasPressed = true;
                    
                    bIsPressed = false;
                }

            }
        } else {
            iNumCycle = 0;
        }

    }

    return;
}



/******************************************************************************/
//
/******************************************************************************/
bool button::isPressed()
{
    if(bIsPressed)  return true;
    else            return false;
}


/******************************************************************************/
//
/******************************************************************************/
bool button::wasPressed()
{   
    if(bWasPressed) return true;
    else            return false;
    
}