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diff --git a/digital/io-hub/src/common-cc/chrono.stm32.cc b/digital/io-hub/src/common-cc/chrono.stm32.cc
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+// io-hub - Modular Input/Output. {{{
+//
+// Copyright (C) 2013 Nicolas Schodet
+//
+// APBTeam:
+// Web: http://apbteam.org/
+// Email: team AT apbteam DOT org
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 2 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+//
+// }}}
+#include "chrono.hh"
+
+#include <libopencm3/stm32/f4/rcc.h>
+#include <libopencm3/stm32/f4/timer.h>
+
+Chrono::Chrono (int duration_ms)
+ : duration_ms_ (duration_ms), started_ (false)
+{
+}
+
+void
+Chrono::start ()
+{
+ started_ = true;
+ rcc_peripheral_enable_clock (&RCC_APB1ENR, RCC_APB1ENR_TIM2EN);
+ TIM2_PSC = 2 * rcc_ppre1_frequency / 1000 - 1; // 1 ms prescaler
+ TIM2_ARR = 3600 * 1000;
+ TIM2_EGR = TIM_EGR_UG;
+ TIM2_CR1 = TIM_CR1_OPM | TIM_CR1_CEN;
+}
+
+int
+Chrono::remaining_time_ms () const
+{
+ int now = 0;
+ if (started_)
+ now = TIM2_CNT;
+ return duration_ms_ - now;
+}