ButtonIn.cpp

00001 /*
00002 ButtonIn is a debouncing InterruptIn class for mbed (http://mbed.org).
00003 
00004 Copyright (C) 2012 Erik van Wijk (http://mbed.org/users/evwijk/)
00005 
00006 This program is free software: you can redistribute it and/or modify
00007 it under the terms of the GNU General Public License as published by
00008 the Free Software Foundation, either version 3 of the License, or
00009 (at your option) any later version.
00010 
00011 This library is distributed in the hope that it will be useful,
00012 but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 GNU General Public License for more details.
00015 
00016 You should have received a copy of the GNU General Public License
00017 along with this program.  If not, see <http://www.gnu.org/licenses/>.
00018 */    
00019     
00020 #include "ButtonIn.h"
00021 
00022 ButtonIn::ButtonIn(PinName buttonPin) :
00023     _button(buttonPin) {
00024         _buttonCanPress = true;
00025         _callback = NULL;
00026         _callbackInstance = NULL;
00027         _callbackMethod = NULL;
00028         timeout = 200;
00029         _button.rise(this, &ButtonIn::click);
00030 }
00031 
00032 void ButtonIn::attach(void (*method)(void)) {
00033     _callback = method;
00034 }
00035     
00036 template<class T>
00037 void attach(T* instance, void (T::*method)(void)) {
00038     _callbackInstance = (ButtonInCallbackInstance *)instance;
00039     _callbackMethod = (void (ButtonInCallbackInstance::*)(void))method;
00040 }
00041 
00042 void ButtonIn::click() {
00043     if (_buttonCanPress) {
00044         _buttonCanPress = false;
00045         _buttonDownTimeout.attach_us(this, &ButtonIn::reset, timeout * 1000);
00046         call();
00047     }
00048 }
00049 
00050 void ButtonIn::call() {
00051     if (_callback != NULL)
00052         (*_callback)();
00053     else
00054         (_callbackInstance->*_callbackMethod)();        
00055 }
00056 
00057 void ButtonIn::reset() {
00058     _buttonCanPress = true;
00059 }