scan a 3x4 keypad with softaware pulldown resistors by polling it continuously.

Fork of keypad by Dimiter K

Revision:
1:b8305e120e11
Parent:
0:1fa357ea3fcc
--- a/keypad.cpp	Sat Nov 06 14:36:22 2010 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,78 +0,0 @@
-/*	 Copyright (c) 2010 Dimiter Kentri
-
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
-
-The above copyright notice and this permission notice shall be included in
-all copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-THE SOFTWARE.
-*/
-
-/*Simple example
-
-#include "mbed.h"
-#include "keypad.h"
-	  
-Serial pc(USBTX, USBRX); 
-Keypad telepad(p13,p14,p15,p16,p17,p18,p19,p20);
-					
-int main(void){
-  char key;
-  pc.printf("Enter codes\n\r");
-  while(1){ 
-	key = telepad.getKey();	
-	if(key != KEY_RELEASED){
-	pc.printf("%c\n",key);
-	wait(0.6);
-	 }
-	}
-}		*/
-
-#include "mbed.h"
-#include "keypad.h"
-
-using namespace mbed;
-
-Keypad::Keypad(PinName col1, PinName col2, PinName col3, PinName col4, PinName row1,PinName row2, PinName row3, PinName row4): _col1(col1),
-    _col2(col2),_col3(col3),_col4(col4),_rows(row1,row2,row3,row4)    {    
-        
-}     
-
-int Keypad::getKeyIndex(){
-    for(int k=0; k<4; k++) {
-            _rows = 0;
-    }    
-    for(int i=0; i<4; i++) {
-            _rows = 1 << i;     
-        for(int j=0; j<4;j++){         
-            if (_col1)
-                return 1+(i*4);
-            else if (_col2)
-                return 2+(i*4);
-               else if (_col3)
-                   return 3+(i*4); 
-            else if (_col4)
-                return 4+(i*4);            
-        }
-    }    
-    return -1;
-}          
-
-char Keypad::getKey(){
-int k = getKeyIndex();    
-if(k != -1)
-    return  keys[k-1];
- else 
- return 0;
-}