00001 /*************************************************************************** 00002 tag: Peter Soetens Mon Jan 19 14:11:20 CET 2004 DigitalInput.hpp 00003 00004 DigitalInput.hpp - description 00005 ------------------- 00006 begin : Mon January 19 2004 00007 copyright : (C) 2004 Peter Soetens 00008 email : peter.soetens@mech.kuleuven.ac.be 00009 00010 *************************************************************************** 00011 * This library is free software; you can redistribute it and/or * 00012 * modify it under the terms of the GNU General Public * 00013 * License as published by the Free Software Foundation; * 00014 * version 2 of the License. * 00015 * * 00016 * As a special exception, you may use this file as part of a free * 00017 * software library without restriction. Specifically, if other files * 00018 * instantiate templates or use macros or inline functions from this * 00019 * file, or you compile this file and link it with other files to * 00020 * produce an executable, this file does not by itself cause the * 00021 * resulting executable to be covered by the GNU General Public * 00022 * License. This exception does not however invalidate any other * 00023 * reasons why the executable file might be covered by the GNU General * 00024 * Public License. * 00025 * * 00026 * This library is distributed in the hope that it will be useful, * 00027 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00028 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * 00029 * Lesser General Public License for more details. * 00030 * * 00031 * You should have received a copy of the GNU General Public * 00032 * License along with this library; if not, write to the Free Software * 00033 * Foundation, Inc., 59 Temple Place, * 00034 * Suite 330, Boston, MA 02111-1307 USA * 00035 * * 00036 ***************************************************************************/ 00037 00038 #ifndef DIGITALINPUT_HPP 00039 #define DIGITALINPUT_HPP 00040 00041 #include "DigitalInInterface.hpp" 00042 00043 namespace RTT 00044 { namespace dev { 00045 00054 class RTT_API DigitalInput 00055 { 00056 public: 00065 DigitalInput( DigitalInInterface* dig_in, unsigned int bit_nr, bool invert = false ) 00066 :board(dig_in), bitnumber(bit_nr) , minvert(invert), mvalue(invert) 00067 { 00068 } 00069 00078 DigitalInput( const bool& value, bool invert = false ) 00079 :board(0), bitnumber(0), minvert(invert), mvalue(value) 00080 { 00081 } 00082 00086 ~DigitalInput() {}; 00087 00093 bool isOn() const 00094 { 00095 // Q: who knew that != is logical xor ? 00096 return board ? minvert != board->isOn(bitnumber) : minvert != mvalue; 00097 } 00098 00099 private: 00100 DigitalInInterface *board; 00101 int bitnumber; 00102 bool minvert; 00103 const bool& mvalue; 00104 }; 00105 }} 00106 00107 #endif // DIGITALINPUT_HPP