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diff --git a/n/avr/modules/twi/twi.h b/n/avr/modules/twi/twi.h
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+#ifndef twi_h
+#define twi_h
+/* twi.h */
+/* avr.twi - TWI AVR module. {{{
+ *
+ * Copyright (C) 2005 Demonchy Clément
+ *
+ * Robot APB Team/Efrei 2006.
+ * 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 <inttypes.h>
+
+/** Initialise twi. */
+void
+twi_init (uint8_t addr);
+
+#ifdef TWI_SLAVE_ENABLE
+/** Récupère dans buffer les données recues en tant qu'esclave */
+uint8_t
+twi_sl_poll (uint8_t *buffer, uint8_t size);
+/** Met à jour le buffer de donnée à envoyer */
+void
+twi_sl_update (uint8_t *buffer, uint8_t size);
+#endif /* TWI_SLAVE_ENABLE */
+
+#ifdef TWI_MASTER_ENABLE
+/** Is the current transaction finished ? */
+int8_t
+twi_ms_is_finished (void);
+/** Send len bytes of data to address */
+int8_t
+twi_ms_send (uint8_t address, uint8_t *data, uint8_t len);
+/** Read len bytes at addresse en put them in data */
+int8_t
+twi_ms_read (uint8_t address, uint8_t *data, uint8_t len);
+#endif /* TWI_MASTER_ENABLE */
+
+#endif /* twi_h */