Debounce a mechanical switch by periodic sampling.
Dependents: RedButton WS_7_Seg_mit_LM1635 WS_7_Seg_mit_LM1635 Lichtschalter_M0 ... more
Diff: Debouncer.h
- Revision:
- 0:2359961af424
- Child:
- 2:7f2f00805d41
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Debouncer.h Mon May 18 12:57:27 2015 +0000 @@ -0,0 +1,49 @@ +/* Copyright (c) 2015 Liyang HU, MIT License + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice shall be + * included in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY + * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + +#include <mbed.h> +#include <DigitalIn.h> +#include <Ticker.h> + +class Debouncer : private Ticker +{ +private: + FunctionPointer fun_fall, fun_rise; + DigitalIn in; + bool now; + int _samples; + uint32_t previous; + void tick(void); + +public: + Debouncer(PinName pin, PinMode mode = PullUp); + Debouncer &samples(int n = 8); + Debouncer &period(float seconds = 3.90625e-3); + operator bool(void); + + Debouncer &attach_fall(void (*fun)(void) = NULL); + Debouncer &attach_rise(void (*fun)(void) = NULL); + template <typename T> + Debouncer &attach_fall(T *obj, void (T::*fun)(void) = NULL); + template <typename T> + Debouncer &attach_rise(T *obj, void (T::*fun)(void) = NULL); +};