Diff: settings.cpp

Revision:

15:688b3e3958fd

diff -r 27a488215184 -r 688b3e3958fd settings.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/settings.cpp	Fri Aug 23 21:45:08 2013 +0000
@@ -0,0 +1,70 @@
+// Copyright (c) 2013, jake (at) allaboutjake (dot) com
+// All rights reserved.
+// 
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above copyright
+//       notice, this list of conditions and the following disclaimer in the
+//       documentation and/or other materials provided with the distribution.
+//     * The name of the author and/or copyright holder nor the
+//       names of its contributors may be used to endorse or promote products
+//       derived from this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER, AUTHOR, OR ANY CONTRIBUTORS
+// BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 
+// GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 
+// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 
+// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 
+// OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// DESCRIPTION OF FILE:
+//
+// This file contains routines for storing and retreiving settings values in flash.
+// Currently, there is only one thing stored in flash: the username/password for
+// authentication.  This makes the routine very simple.  However, if more settings
+// become necessary, a more advanced method for managing the block of memory in
+// flash will need to be created.
+//
+
+#include "settings.h"
+#include "mbed.h"
+#include "main.h"
+
+IAP iap;
+
+// This function clears the memory block and stores the new authenticaiton token in flash
+void setAuthenticationToken(char* token, int length) {
+    if (length+1 < IAP_MEM_SIZE) {
+        char terminatedToken[IAP_MEM_SIZE];
+        memcpy(terminatedToken, token, length);
+        terminatedToken[length]=0;//terminator
+        
+        // Erase the flash area
+        iap.prepare( TARGET_SECTOR, TARGET_SECTOR );       
+        iap.erase( TARGET_SECTOR, TARGET_SECTOR );       
+        
+        // Write the new value
+        iap.prepare( TARGET_SECTOR, TARGET_SECTOR );               
+        iap.write( terminatedToken, sector_start_adress[ TARGET_SECTOR ], IAP_MEM_SIZE );        
+    }
+}
+
+// This function checks to see if the memory is blank.  If it is, a password hasn't been set
+// If no password, return NULL, otherwise return the autenticaiton token. (username:password)
+char* getAuthenticationToken() {    
+    int r   = iap.blank_check( TARGET_SECTOR, TARGET_SECTOR );
+        
+    if (r == 0) {
+        //If the memory is blank, then the token isn't in there.
+        return NULL;
+    }
+                   
+    char* token   = (char*)sector_start_adress[ TARGET_SECTOR ];
+    return token;    
+}