File content as of revision 0:e43521d55082:

/* A digital input with switch debouncing
 * Copyright 2015, Takuo Watanabe
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "DebounceIn.h"

DebounceIn::DebounceIn(PinName pin, timestamp_t us) : DigitalIn(pin) {
    _prev = _curr = 0;
    _rise = _fall = NULL;
    set_sample_rate(us);
}

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

int DebounceIn::read() {
    return _curr;
}

#ifdef MBED_OPERATORS
    /** An operator shorthand for read()
     */
    DebounceIn::operator int() {
        return read();
    }
#endif

void DebounceIn::set_sample_rate(timestamp_t us) {
    _ticker.detach();
    _ticker.attach_us(this, &DebounceIn::sample, us);
}

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

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

void DebounceIn::sample() {
    int now = DigitalIn::read();
    if (now == _prev) {
        if (!_curr && now) _rise.call();
        if (_curr && !now) _fall.call();
        _curr = now;
    }
    _prev = now;
}