File content as of revision 0:471239ea932b:

#include "DebouncedEdgeIn.h"
#include "mbed.h"

/*
 * Constructor
 */
DebouncedEdgeIn::DebouncedEdgeIn(PinName in)
    : _in(in),
      _ticker(),
      _rise(),
      _fall(),
      // reset all the flags and counters
      _samples(0),
      _output(0),
      _output_last(0)
{
    // Attach ticker
    _ticker.attach(this, &DebouncedEdgeIn::_sample, 0.005);
}

DebouncedEdgeIn::~DebouncedEdgeIn() {
    _ticker.detach();
}

void DebouncedEdgeIn::rise(void (*fptr)(void))
{
    _rise.attach(fptr);
}

void DebouncedEdgeIn::fall(void (*fptr)(void))
{
    _fall.attach(fptr);
}

void DebouncedEdgeIn::mode(PinMode pull) {
    _in.mode(pull);
}

// return the debounced status
int DebouncedEdgeIn::read(void)
{
    return(_output);
}

// shorthand for read()
DebouncedEdgeIn::operator int()
{
    return read();
}

void DebouncedEdgeIn::_sample(void)
{
    // take a sample
    _samples = _samples >> 1; // shift left

    if (_in) {
        _samples |= 0x80;
    }

    // examine the sample window, look for steady state
    if (_samples == 0x00) {
        _output = 0;
    } else if (_samples == 0xFF) {
        _output = 1;
    }

    // Rising edge detection
    if ((_output == 1) && (_output_last == 0)) {
        _rise.call();
    }
    // Falling edge detection
    else if ((_output == 0) && (_output_last == 1)) {
        _fall.call();
    }

    // update the output
    _output_last = _output;
}