Detect support for flash chip and disable tab if not available

_locales/en/messages.json

@@ -846,7 +846,10 @@
     },
 
     "dataflashNote": {
-        "message": "Blackbox flight logs can be stored on the onboard dataflash chip if your flight controller supports one."
+        "message": "Blackbox flight logs can be recorded to your flight controller's onboard dataflash chip."
+    },
+    "dataflashNotSupportedNote": {
+        "message": "Your flight controller does not have a compatible dataflash chip available."
     },
     "dataflashButtonSaveFile": {
         "message": "Save flash to file..."

tabs/dataflash.css

@@ -177,3 +177,16 @@
 .dataflash-saving.done .dataflash-saving-after {
     display:block;
 }
+
+.require-dataflash {
+    display:none;
+}
+.tab-dataflash.supported .require-dataflash {
+    display:block;
+}
+.require-no-dataflash {
+    display:block;
+}
+.tab-dataflash.supported .require-no-dataflash {
+    display:none;
+}

tabs/dataflash.html

@@ -1,4 +1,5 @@
 <div class="tab-dataflash">
+    <div class="require-dataflash">
         <div class="note" i18n="dataflashNote">
         </div>
         
@@ -55,9 +56,11 @@
             </li>
         </ul>
         
-    
         <div class="buttons">
             <a href="#" class="erase-flash" i18n="dataflashButtonErase"></a>
             <a href="#" class="save-flash" i18n="dataflashButtonSaveFile"></a>
         </div>
     </div>
+    <div class="note require-no-dataflash" i18n="dataflashNotSupportedNote">
+    </div>
+</div>

tabs/dataflash.js

@@ -71,9 +71,15 @@ TABS.dataflash.initialize = function (callback) {
     }
     
     function create_html() {
+        var
+            supportsDataflash = DATAFLASH.totalSize > 0;
+        
         // translate to user-selected language
         localize();
 
+        $(".tab-dataflash").toggleClass("supported", supportsDataflash);
+        
+        if (supportsDataflash) {
             // UI hooks
             $('.tab-dataflash a.erase-flash').click(ask_to_erase_flash);
             
@@ -85,6 +91,7 @@ TABS.dataflash.initialize = function (callback) {
             $('.tab-dataflash a.save-flash-dismiss').click(dismiss_saving_dialog);
             
             update_html();
+        }
         
         if (callback) callback();
     }