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diff --git a/ucoo/hal/timer/timer.stm32.tcc b/ucoo/hal/timer/timer.stm32.tcc
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+#ifndef ucoo_hal_timer_timer_stm32_tcc
+#define ucoo_hal_timer_timer_stm32_tcc
+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2015 Nicolas Schodet
+//
+// Permission is hereby granted, free of charge, to any person obtaining a
+// copy of this software and associated documentation files (the "Software"),
+// to deal in the Software without restriction, including without limitation
+// the rights to use, copy, modify, merge, publish, distribute, sublicense,
+// and/or sell copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+//
+// }}}
+#include <libopencm3/stm32/timer.h>
+#include <libopencm3/stm32/rcc.h>
+
+namespace ucoo {
+
+template<uint32_t Base>
+struct TimerHardware { };
+
+template<>
+struct TimerHardware<TIM2>
+{
+ static const enum rcc_periph_clken clken = RCC_TIM2;
+ // TODO timer uses a double frequency only if APB prescaler is not 1.
+ static int freq () { return 2 * rcc_apb1_frequency; }
+};
+
+template<uint32_t Base>
+TimerHard<Base>::~TimerHard ()
+{
+ disable ();
+}
+
+template<uint32_t Base>
+void
+TimerHard<Base>::enable (int freq)
+{
+ rcc_periph_clock_enable (TimerHardware<Base>::clken);
+ int in_freq = TimerHardware<Base>::freq ();
+ int div = in_freq / freq;
+ assert (div <= 0x10000 && in_freq / div == freq);
+ TIM_CR1 (Base) = 0;
+ TIM_PSC (Base) = div - 1;
+ TIM_ARR (Base) = 0xffffffff;
+ TIM_EGR (Base) = TIM_EGR_UG;
+ TIM_CR1 (Base) = TIM_CR1_CEN;
+}
+
+template<uint32_t Base>
+void
+TimerHard<Base>::disable ()
+{
+ TIM_CR1 (Base) = 0;
+ rcc_periph_clock_disable (TimerHardware<Base>::clken);
+}
+
+template<uint32_t Base>
+uint32_t
+TimerHard<Base>::get_value ()
+{
+ return TIM_CNT (Base);
+}
+
+} // namespace ucoo
+
+#endif // ucoo_hal_timer_timer_stm32_tcc