Jan Waclawek
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Simon
would be Simon game, as a demonstrator for buttons debouncing and \"collecting\" ---
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DebounceIn__copy.h
00001 /* 00002 Copyright (c) 2010 Andy Kirkham 00003 00004 Permission is hereby granted, free of charge, to any person obtaining a copy 00005 of this software and associated documentation files (the "Software"), to deal 00006 in the Software without restriction, including without limitation the rights 00007 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 00008 copies of the Software, and to permit persons to whom the Software is 00009 furnished to do so, subject to the following conditions: 00010 00011 The above copyright notice and this permission notice shall be included in 00012 all copies or substantial portions of the Software. 00013 00014 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 00015 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 00016 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 00017 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 00018 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 00019 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 00020 THE SOFTWARE. 00021 */ 00022 00023 #ifndef DEBOUNCEIN_H 00024 #define DEBOUNCEIN_H 00025 00026 #include "mbed.h" 00027 00028 /** DebounceIn adds mechanical switch debouncing to DigitialIn. 00029 * 00030 * Example: 00031 * @code 00032 * #include "mbed.h" 00033 * #include "DebounceIn.h" 00034 * 00035 * DebounceIn d(p5); 00036 * DigitialOut led1(LED1); 00037 * DigitialOut led2(LED2); 00038 * 00039 * int main() { 00040 * while(1) { 00041 * led1 = d; 00042 * led2 = d.read(); 00043 * } 00044 * } 00045 * @endcode 00046 * 00047 * @see set_debounce_us() To change the sampling frequency. 00048 * @see set_samples() To alter the number of samples. 00049 * 00050 * This example shows one input displayed by two outputs. The input 00051 * is debounced by the default 10ms. 00052 */ 00053 00054 class DebounceIn : public DigitalIn { 00055 public: 00056 00057 /** set_debounce_us 00058 * 00059 * Sets the debounce sample period time in microseconds, default is 1000 (1ms) 00060 * 00061 * @param int i The debounce sample period time to set. 00062 */ 00063 void set_debounce_us(int i) { _ticker.attach_us(this, &DebounceIn::_callback, i); } 00064 00065 /** set_samples 00066 * 00067 * Defines the number of samples before switching the shadow 00068 * definition of the pin. 00069 * 00070 * @param int i The number of samples. 00071 */ 00072 void set_samples(int i) { _samples = i; } 00073 00074 /** read 00075 * 00076 * Read the value of the debounced pin. 00077 */ 00078 int read(void) { return _shadow; } 00079 00080 #ifdef MBED_OPERATORS 00081 /** operator int() 00082 * 00083 * Read the value of the debounced pin. 00084 */ 00085 operator int() { return read(); } 00086 #endif 00087 00088 int pressed; 00089 /** Constructor 00090 * 00091 * @param PinName pin The pin to assign as an input. 00092 */ 00093 DebounceIn(PinName pin, const char *name = NULL) : DigitalIn(pin, name) { _counter = 0; _samples = 10; set_debounce_us(1000); pressed = 0;}; 00094 00095 protected: 00096 void _callback(void) { 00097 if (DigitalIn::read()) { 00098 if (_counter < _samples) _counter++; 00099 if ((_counter == _samples) && (_shadow == 0)) { 00100 _shadow = 1; 00101 pressed = 1; 00102 } 00103 } 00104 else { 00105 if (_counter > 0) _counter--; 00106 if (_counter == 0) _shadow = 0; 00107 } 00108 } 00109 00110 Ticker _ticker; 00111 int _shadow; 00112 int _counter; 00113 int _samples; 00114 }; 00115 00116 #endif 00117
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