keypad3x4.cpp

00001 
00002 
00003 //Dimiter Kentri update
00004 
00005 
00006 /*   Copyright (c) 2010 Dimiter Kentri
00007 
00008 Permission is hereby granted, free of charge, to any person obtaining a copy
00009 of this software and associated documentation files (the "Software"), to deal
00010 in the Software without restriction, including without limitation the rights
00011 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00012 copies of the Software, and to permit persons to whom the Software is
00013 furnished to do so, subject to the following conditions:
00014 
00015 The above copyright notice and this permission notice shall be included in
00016 all copies or substantial portions of the Software.
00017 
00018 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00019 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00020 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00021 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00022 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00023 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00024 THE SOFTWARE.
00025 */
00026 
00027 #include "mbed.h"
00028 #include "keypad3x4.h"
00029 
00030 using namespace mbed;
00031 
00032 Keypad::Keypad(PinName col1,PinName col2,PinName col3,PinName row1,PinName row2,PinName row3,PinName row4):_col1(col1),_col2(col2),_col3(col3),_rows(row1,row2,row3,row4)    
00033 {    
00034     _col1.mode(PullUp);
00035     _col2.mode(PullUp);
00036     _col3.mode(PullUp);      
00037 }     
00038 
00039 int Keypad::getKeyIndex()
00040 {
00041     _rows = 0;   
00042     for(int i=0; i<4; i++) 
00043     {
00044         _rows = 1 << i;     
00045         for(int j=0; j<4;j++)
00046         {         
00047             if (_col1)
00048                 return 1+(i*3);
00049             else if (_col2)
00050                 return 2+(i*3);
00051             else if (_col3)
00052                 return 3+(i*3);            
00053         }
00054     }    
00055     return 11;
00056 }          
00057 
00058 char Keypad::getKey()
00059 {
00060     int k = getKeyIndex();    
00061     if(k != 11)
00062         return  keys[k-1];
00063     else 
00064         return 0;
00065 }