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diff --git a/src/common/led.h b/src/common/led.h
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+#ifndef led_h
+#define led_h
+/* led.h */
+/* binwatch - Tiny binary wristwatch. {{{
+ *
+ * Copyright (C) 2010 Nicolas Schodet
+ *
+ * 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.
+ *
+ * Contact :
+ * Web: http://ni.fr.eu.org/
+ * Email: <nico at ni.fr.eu.org>
+ * }}} */
+
+/** Display a binary number on leds during a duration (1 = 5 ms). */
+void
+led_display (uint16_t leds, uint16_t duration);
+
+#endif /* led_h */