Diff: keypad.cpp

Revision:

1:fa689a04c361

Parent:

0:1fa357ea3fcc

Child:

14:d6592dac4365

--- a/keypad.cpp	Sat Nov 06 14:36:22 2010 +0000
+++ b/keypad.cpp	Sat Sep 19 07:51:21 2015 +0000
@@ -1,4 +1,4 @@
-/*	 Copyright (c) 2010 Dimiter Kentri
+/*	 Copyright (c) 2015 Rune Langøy
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
@@ -19,60 +19,54 @@
 THE SOFTWARE.
 */
 
-/*Simple example
+/*
+  Example is available in keypad.h
 
-#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)    {    
-        
-}     
+Keypad::Keypad(PinName col0, PinName col1, PinName col2, PinName col3, 
+               PinName row0,PinName row1, PinName row2, PinName row3): 
+               _cols(col0,col1,col2,col3) ,_rows(row0,row1,row2,row3)    {    }     
+
+ void Keypad::enablePullUp()
+{
+  _cols.mode(PullUp);
+}
 
-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);            
-        }
+bool Keypad::getKeyPressed()
+{
+    _rows = 0;              // Ground all keys  
+    if(_cols.read()==0xff)  //Chk if key is pressed
+       return false;
+       
+    return true; 
+}
+
+int Keypad::getKeyIndex()
+{
+    if (!getKeyPressed())
+       return -1;
+     
+     //Scan rows and cols and return switch index   
+    for(int i=0; i<4; i++) 
+    {   _rows = ~(0x01 << i);   
+        for(int j=0; j<4;j++)         
+          if (  !( (_cols.read()>> j )& 0x1 ))
+              return  j + (i*4);
     }    
     return -1;
 }          
 
-char Keypad::getKey(){
-int k = getKeyIndex();    
-if(k != -1)
-    return  keys[k-1];
- else 
- return 0;
+char Keypad::getKey()
+{
+  int k = getKeyIndex();    
+  if(k != -1)
+    return  keys[k];
+ 
+   return 0;
 }