keypad.cpp

00001 /*   Copyright (c) 2010 Dimiter Kentri
00002 
00003 Permission is hereby granted, free of charge, to any person obtaining a copy
00004 of this software and associated documentation files (the "Software"), to deal
00005 in the Software without restriction, including without limitation the rights
00006 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
00007 copies of the Software, and to permit persons to whom the Software is
00008 furnished to do so, subject to the following conditions:
00009 
00010 The above copyright notice and this permission notice shall be included in
00011 all copies or substantial portions of the Software.
00012 
00013 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
00014 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
00015 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
00016 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
00017 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
00018 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
00019 THE SOFTWARE.
00020 */
00021 
00022 /*Simple example
00023 
00024 #include "mbed.h"
00025 #include "keypad.h"
00026       
00027 Serial pc(USBTX, USBRX); 
00028 Keypad telepad(p13,p14,p15,p16,p17,p18,p19,p20);
00029                     
00030 int main(void){
00031   char key;
00032   pc.printf("Enter codes\n\r");
00033   while(1){ 
00034     key = telepad.getKey(); 
00035     if(key != KEY_RELEASED){
00036     pc.printf("%c\n",key);
00037     wait(0.6);
00038      }
00039     }
00040 }       */
00041 
00042 #include "mbed.h"
00043 #include "keypad.h"
00044 
00045 using namespace mbed;
00046 
00047 Keypad::Keypad(PinName col1, PinName col2, PinName col3, PinName col4, PinName row1,PinName row2, PinName row3, PinName row4): _col1(col1),
00048     _col2(col2),_col3(col3),_col4(col4),_rows(row1,row2,row3,row4)    {    
00049         
00050 }     
00051 
00052 int Keypad::getKeyIndex(){
00053     for(int k=0; k<4; k++) {
00054             _rows = 0;
00055     }    
00056     for(int i=0; i<4; i++) {
00057             _rows = 1 << i;     
00058         for(int j=0; j<4;j++){         
00059             if (_col1)
00060                 return 1+(i*4);
00061             else if (_col2)
00062                 return 2+(i*4);
00063                else if (_col3)
00064                    return 3+(i*4); 
00065             else if (_col4)
00066                 return 4+(i*4);            
00067         }
00068     }    
00069     return -1;
00070 }          
00071 
00072 char Keypad::getKey(){
00073 int k = getKeyIndex();    
00074 if(k != -1)
00075     return  keys[k-1];
00076  else 
00077  return 0;
00078 }