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diff --git a/timer.h b/timer.h
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+/*
+ * Copyright (C) 2015, 2016 "IoT.bzh"
+ * Author "Romain Forlot" <romain.forlot@iot.bzh>
+ *
+ * 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.
+ */
+
+#pragma once
+
+typedef unsigned long (*TimeFunction)();
+
+/* Public: A frequency counting clock.
+ *  *
+ *   * frequency - the clock freuquency in Hz.
+ *    * lastTime - the last time (in milliseconds since startup) that the clock
+ *     *      ticked.
+ *      */
+typedef struct {
+	    float frequency;
+	        unsigned long lastTick;
+		    TimeFunction timeFunction;
+} FrequencyClock;