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diff --git a/app/triface/hw/hw_adc.h b/app/triface/hw/hw_adc.h
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+/**
+ * \file
+ * <!--
+ * This file is part of BeRTOS.
+ *
+ * Bertos 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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ * As a special exception, you may use this file as part of a free software
+ * library without restriction.  Specifically, if other files instantiate
+ * templates or use macros or inline functions from this file, or you compile
+ * this file and link it with other files to produce an executable, this
+ * file does not by itself cause the resulting executable to be covered by
+ * the GNU General Public License.  This exception does not however
+ * invalidate any other reasons why the executable file might be covered by
+ * the GNU General Public License.
+ *
+ * Copyright 2003, 2004, 2006 Develer S.r.l. (http://www.develer.com/)
+ * Copyright 2000 Bernardo Innocenti <bernie@codewiz.org>
+ *
+ * -->ght 2006 Develer S.r.l. (http://www.develer.com/)
+ *
+ * \brief Macro for HW_AIN_H
+ *
+ *
+ * \version $Id$
+ *
+ * \author Andrea Grandi <andrea@develer.com>
+ */
+
+#ifndef HW_ADC_H
+#define HW_ADC_H
+
+#include <avr/io.h>
+
+#define START_CONVERTION (ADCSRA |= BV(ADSC))
+#define ENABLE_ADC (ADCSRA |= BV(ADEN))
+#define SET_AI_ADLAR (ADMUX &= ~BV(ADLAR))
+
+/** Microseconds to wait before starting conversion after changing a channel */
+#define STABILIZING_AI_CHANNEL_TIME 125
+
+/** Number of AIN channels */
+#define ADC_CHANNEL_NUM 4
+
+void adc_set_active_ain(int ai);
+void adc_init(void);
+void adc_set_vref_avcc(void);
+int adc_read_ai_channel(int channel);
+
+#endif // HW_ADC_H
+