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+#ifndef ucoolib_utils_delay_arm_hh
+#define ucoolib_utils_delay_arm_hh
+// ucoolib - Microcontroller object oriented library. {{{
+//
+// Copyright (C) 2012 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.
+//
+// }}}
+
+namespace ucoo {
+
+/// Wait for an integral number of microseconds, used to implement delay.
+void
+delay_us (int us);
+
+/// Wait for a small integral number of nanoseconds, used to implement short
+/// delay.
+void
+delay_ns (int us);
+
+/// Wait for the specified delay in seconds.
+extern inline void
+delay (double s)
+{
+ if (s < 1e-6)
+ delay_ns (static_cast<int> (s * 1e9));
+ else
+ delay_us (static_cast<int> (s * 1e6));
+}
+extern inline void
+delay (double s) __attribute__ ((always_inline));
+
+} // namespace ucoo
+
+#endif // ucoolib_utils_delay_arm_hh