2532
Dependencies: QEI WS2812 PixelArray DFPlayerMini MODSERIAL PCA9685_ pca9685
Diff: DebounceIn.h
- Revision:
- 0:474fb16588bf
diff -r 000000000000 -r 474fb16588bf DebounceIn.h --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/DebounceIn.h Sun Jun 02 14:42:26 2019 +0000 @@ -0,0 +1,143 @@ +/* + Copyright (c) 2010 Andy Kirkham + + 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. +*/ + +#ifndef DEBOUNCEIN_H +#define DEBOUNCEIN_H + +#include "mbed.h" + +/** DebounceIn adds mechanical switch debouncing to DigitialIn. + * + * Example: + * @code + * #include "mbed.h" + * #include "DebounceIn.h" + * + * DebounceIn d(p5); + * DigitialOut led1(LED1); + * DigitialOut led2(LED2); + * + * int main() { + * while(1) { + * led1 = d; + * led2 = d.read(); + * } + * } + * @endcode + * + * @see set_debounce_us() To change the sampling frequency. + * @see set_samples() To alter the number of samples. + * + * Users of this library may also be interested in PinDetect library:- + * @see http://mbed.org/users/AjK/libraries/PinDetect/latest + * + * This example shows one input displayed by two outputs. The input + * is debounced by the default 10ms. + */ + +class DebounceIn : public DigitalIn { + public: + + /** set_debounce_us + * + * Sets the debounce sample period time in microseconds, default is 1000 (1ms) + * + * @param int i The debounce sample period time to set. + */ + void set_debounce_us(int i) + { + _ticker.attach_us(this, &DebounceIn::_callback, i); + //ticker.attach(callback(this, &Sonar::background_read), 0.01f) + } + + /** set_samples + * + * Defines the number of samples before switching the shadow + * definition of the pin. + * + * @param int i The number of samples. + */ + void set_samples(int i) { _samples = i; } + + /** read + * + * Read the value of the debounced pin. + */ + int read(void) { return _shadow; } + int trig(void) { _trig2 = _trig; _trig = 0; return _trig2; } + int ntrig(void) { _ntrig2 = _ntrig; _ntrig = 0; return _ntrig2; } + +#ifdef MBED_OPERATORS + /** operator int() + * + * Read the value of the debounced pin. + */ + operator int() { return read(); } +#endif + + /** Constructor + * + * @param PinName pin The pin to assign as an input. + */ + DebounceIn(PinName pin) : DigitalIn(pin,PullUp) { _counter = 0; _samples = 5; set_debounce_us(8100); }; + + protected: + void _callback(void) { + if (DigitalIn::read()) { + if (_counter < _samples) _counter++; + if (_counter == _samples) + { + _ntrig = 0; // comment if you don`t want to miss signal + _nlock = 0; + _shadow = 1; + if (!_lock) {_trig = 1; _lock = 1;} + } + } + else { + if (_counter > 0) _counter--; + if (_counter == 0) + { + _shadow = 0; + _trig = 0; // comment if you don`t want to miss signal + _lock = 0; + if (!_nlock) {_ntrig = 1; _nlock = 1;} + } + } + } + + Ticker _ticker; + int _lock; + int _nlock; + + int _ntrig; + int _ntrig2; + + int _trig; + int _trig2; + + int _shadow; + int _counter; + int _samples; +}; + +#endif +