initial blocks for storage

.gitignore

@@ -6,6 +6,7 @@ temp
 projects
 win10/app/bin
 win10/app/bld
+win10/*.opendb
 
 *.user
 *.sw?

libs/microbit/enums.d.ts

@@ -281,5 +281,7 @@ declare namespace serial {
     Int32BE = 10,
     // UInt32,
     }
+declare namespace storage {
+}
 
 // Auto-generated. Do not edit. Really.

libs/microbit/pxt.json

@@ -26,7 +26,8 @@
         "pins.ts",
         "serial.cpp",
         "serial.ts",
-        "buffer.cpp"
+        "buffer.cpp",
+        "storage.cpp"
     ],
     "public": true,
     "dependencies": {},

libs/microbit/shims.d.ts

@@ -585,4 +585,36 @@ declare interface Buffer {
     write(dstOffset: number, src: Buffer): void;
 }
 
+
+    /**
+     * Allows to save and read values in the flash storage
+     */
+    //% weight=10 color=#cc6600
+declare namespace storage {
+
+    /**
+     * Writes the key and buffer pair into flash.
+     */
+    //% blockId="storage_put_buffer" block="storage put buffer %key|with %buffer" weight=50 shim=storage::putBuffer
+    function putBuffer(key: string, buffer: Buffer): void;
+
+    /**
+     * Gets the buffer at the given key if any. If no key is available, empty buffer is returned.
+     */
+    //% blockId="storage_get_buffer" block="storage get buffer %key" weight=49 shim=storage::getBuffer
+    function getBuffer(key: string): Buffer;
+
+    /**
+     * Removes an entry identified by the key.
+     */
+    //% blockId="storage_remove" block="storage remove %key" weight=20 shim=storage::remove
+    function remove(key: string): void;
+
+    /**
+     * The number of entries in the key value store
+     */
+    //% blockId="storage_size" block="storage size" weight=10 shim=storage::size
+    function size(): number;
+}
+
 // Auto-generated. Do not edit. Really.

libs/microbit/storage.cpp

@@ -0,0 +1,42 @@
+#include "ksbit.h"
+
+/**
+* Allows to save and read values in the flash storage
+*/
+//% weight=10 color=#cc6600
+namespace storage {
+    /**
+    * Writes the key and buffer pair into flash.
+    */
+    //% blockId="storage_put_buffer" block="storage put buffer %key|with %buffer" weight=50
+    void putBuffer(StringData* key, Buffer buffer) {        
+        uBit.storage.put(ManagedString(key), ManagedBuffer(buffer).getBytes());
+    }
+      
+    /**
+    * Gets the buffer at the given key if any. If no key is available, empty buffer is returned.
+    */
+    //% blockId="storage_get_buffer" block="storage get buffer %key" weight=49
+    Buffer getBuffer(StringData* key) {
+        KeyValuePair* pv = uBit.storage.get(ManagedString(key));
+        if (pv == NULL) return ManagedBuffer().leakData();
+        
+        return ManagedBuffer(pv->value, sizeof(pv->value)).leakData();
+    }
+    
+    /**
+    * Removes an entry identified by the key.
+    */
+    //% blockId="storage_remove" block="storage remove %key" weight=20
+    void remove(StringData * key) {
+        uBit.storage.remove(ManagedString(key));
+    }
+    
+    /**
+    * The number of entries in the key value store
+    */
+    //% blockId="storage_size" block="storage size" weight=10
+    int size() {
+        return uBit.storage.size();
+    }
+}