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diff --git a/ext/Transaction.h b/ext/Transaction.h
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+/* mbed Microcontroller Library
+ * Copyright (c) 2015 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef MBED_TRANSACTION_H
+#define MBED_TRANSACTION_H
+
+#include "platform.h"
+#include "FunctionPointer.h"
+
+namespace mbed {
+
+/** Transaction structure
+ */
+typedef struct {
+    void *tx_buffer;           /**< Tx buffer */
+    size_t tx_length;          /**< Length of Tx buffer*/
+    void *rx_buffer;           /**< Rx buffer */
+    size_t rx_length;          /**< Length of Rx buffer */
+    uint32_t event;            /**< Event for a transaction */
+    event_callback_t callback; /**< User's callback */
+    uint8_t width;             /**< Buffer's word width (8, 16, 32, 64) */
+} transaction_t;
+
+/** Transaction class defines a transaction.
+ */
+template<typename Class>
+class Transaction {
+public:
+    Transaction(Class *tpointer, const transaction_t& transaction) : _obj(tpointer), _data(transaction) {
+    }
+
+    Transaction() : _obj(), _data() {
+    }
+
+    ~Transaction() {
+    }
+
+    /** Get object's instance for the transaction
+     *
+     * @return The object which was stored
+     */
+    Class* get_object() {
+        return _obj;
+    }
+
+    /** Get the transaction
+     *
+     * @return The transaction which was stored
+     */
+    transaction_t* get_transaction() {
+        return &_data;
+    }
+
+private:
+    Class* _obj;
+    transaction_t _data;
+};
+
+}
+
+#endif