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diff --git a/CAN-binder/low-can-binding/utils/timer.hpp b/CAN-binder/low-can-binding/utils/timer.hpp
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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
+
+/// @brief return epoch in milliseconds
+///
+/// @return long long int epoch in milliseconds
+typedef long long int (*time_function_t)();
+
+long long int system_time_us();
+long long int system_time_ms();
+long long int system_time_s();
+
+
+/// @brief A frequency counting clock.
+/// Utility class allowing some time function.
+class frequency_clock_t
+{
+private:
+	float unit_; ///< unit_ - multiplicator to make operation to be in the right unit (milli, micro, nano, etc)
+	float frequency_; ///< the clock frequency in Hz.
+	unsigned long last_tick_; ///< the last time (in milliseconds since startup) that the clock ticked.
+	time_function_t time_function_; ///<  a function returning current time
+
+public:
+	frequency_clock_t();
+	frequency_clock_t(float frequency);
+	frequency_clock_t(float frequency, unsigned long last_tick, time_function_t time_function);
+
+	float get_frequency() const;
+
+	float frequency_to_period();
+	bool started();
+	time_function_t get_time_function();
+	bool elapsed(bool stagger);
+
+	void tick();
+};
+\ No newline at end of file