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+#ifndef ack_h
+#define ack_h
+// ack.h
+// es - Input/Output general purpose board. {{{
+//
+// Copyright (C) 2006 Dufour Jérémy
+//
+// Robot APB Team/Efrei 2004.
+// Web: http://assos.efrei.fr/robot/
+// Email: robot AT efrei DOT fr
+//
+// 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 "common.h"
+
+/** Module for telling upper class something important has occured ! */
+
+/** List here what you want to tell to the world and put a description.
+ * You must use a different number for each code and it must be lower than 255
+ * of course ! */
+#define ACK_NOTHING 0 /* Nothing to ack */
+#define ACK_CONTACT_FRONT 1 /* Something in the front */
+#define ACK_BARILLET_BALL_FRONT 2 /* A ball has been get from the front
+ */
+#define ACK_BARILLET_BALL_REAR 3 /* Ball in the rear */
+
+#define ACK_BARILLET_BALL_ARRIVED 4 /* Ball is comming */
+
+// FIXME, inline ? static ?
+
+/** Reset ack status */
+void ack_reset (void);
+
+/** Init to nothing. */
+void ack_init (void);
+
+/* Set an ack */
+void ack_set (uint8_t ack_code);
+
+/* Get current ack */
+uint8_t ack_get (void);
+
+#endif // ack_h