diff --git a/sam3s_example/sam3s_examples_include/pio.h b/sam3s_example/sam3s_examples_include/pio.h
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+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2010, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * ----------------------------------------------------------------------------
+ */
+
+/**
+ *  \file
+ *
+ *  \section Purpose
+ *
+ *  This file provides a basic API for PIO configuration and usage of
+ *  user-controlled pins. Please refer to the board.h file for a list of
+ *  available pin definitions.
+ *
+ *  \section Usage
+ *
+ *  -# Define a constant pin description array such as the following one, using
+ *     the existing definitions provided by the board.h file if possible:
+ *     \code
+ *        const Pin pPins[] = {PIN_USART0_TXD, PIN_USART0_RXD};
+ *     \endcode
+ *     Alternatively, it is possible to add new pins by provided the full Pin
+ *     structure:
+ *     \code
+ *     // Pin instance to configure PA10 & PA11 as inputs with the internal
+ *     // pull-up enabled.
+ *     const Pin pPins = {
+ *          (1 << 10) | (1 << 11),
+ *          REG_PIOA,
+ *          ID_PIOA,
+ *          PIO_INPUT,
+ *          PIO_PULLUP
+ *     };
+ *     \endcode
+ *  -# Configure a pin array by calling PIO_Configure() with a pointer to the
+ *     array and its size (which is computed using the PIO_LISTSIZE macro).
+ *  -# Change and get the value of a user-controlled pin using the PIO_Set,
+ *     PIO_Clear and PIO_Get methods.
+ *  -# Get the level being currently output by a user-controlled pin configured
+ *     as an output using PIO_GetOutputDataStatus().
+ */
+
+#ifndef _PIO_
+#define _PIO_
+
+/*
+ *         Headers
+ */
+
+#include "chip.h"
+
+#include <stdint.h>
+
+/*
+ *         Global Definitions
+ */
+
+/*  The pin is controlled by the associated signal of peripheral A. */
+#define PIO_PERIPH_A                0
+/*  The pin is controlled by the associated signal of peripheral B. */
+#define PIO_PERIPH_B                1
+/*  The pin is controlled by the associated signal of peripheral C. */
+#define PIO_PERIPH_C                2
+/*  The pin is controlled by the associated signal of peripheral D. */
+#define PIO_PERIPH_D                3
+/*  The pin is an input. */
+#define PIO_INPUT                   4
+/*  The pin is an output and has a default level of 0. */
+#define PIO_OUTPUT_0                5
+/*  The pin is an output and has a default level of 1. */
+#define PIO_OUTPUT_1                6
+
+/*  Default pin configuration (no attribute). */
+#define PIO_DEFAULT                 (0 << 0)
+/*  The internal pin pull-up is active. */
+#define PIO_PULLUP                  (1 << 0)
+/*  The internal glitch filter is active. */
+#define PIO_DEGLITCH                (1 << 1)
+/*  The pin is open-drain. */
+#define PIO_OPENDRAIN               (1 << 2)
+
+/*  The internal debouncing filter is active. */
+#define PIO_DEBOUNCE                (1 << 3)
+
+/*  Enable additional interrupt modes. */
+#define PIO_IT_AIME                 (1 << 4)
+
+/*  Interrupt High Level/Rising Edge detection is active. */
+#define PIO_IT_RE_OR_HL             (1 << 5)
+/*  Interrupt Edge detection is active. */
+#define PIO_IT_EDGE                 (1 << 6)
+
+/*  Low level interrupt is active */
+#define PIO_IT_LOW_LEVEL            (0               | 0 | PIO_IT_AIME)
+/*  High level interrupt is active */
+#define PIO_IT_HIGH_LEVEL           (PIO_IT_RE_OR_HL | 0 | PIO_IT_AIME)
+/*  Falling edge interrupt is active */
+#define PIO_IT_FALL_EDGE            (0               | PIO_IT_EDGE | PIO_IT_AIME)
+/*  Rising edge interrupt is active */
+#define PIO_IT_RISE_EDGE            (PIO_IT_RE_OR_HL | PIO_IT_EDGE | PIO_IT_AIME)
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*
+ *          Global Macros
+ */
+
+/**
+ *  Calculates the size of an array of Pin instances. The array must be defined
+ *  locally (i.e. not a pointer), otherwise the computation will not be correct.
+ *  \param pPins  Local array of Pin instances.
+ *  \return Number of elements in array.
+ */
+#define PIO_LISTSIZE(pPins)    (sizeof(pPins) / sizeof(Pin))
+
+/*
+ *         Global Types
+ */
+
+
+/*
+ *  Describes the type and attribute of one PIO pin or a group of similar pins.
+ *  The #type# field can have the following values:
+ *     - PIO_PERIPH_A
+ *     - PIO_PERIPH_B
+ *     - PIO_OUTPUT_0
+ *     - PIO_OUTPUT_1
+ *     - PIO_INPUT
+ *
+ *  The #attribute# field is a bitmask that can either be set to PIO_DEFAULt,
+ *  or combine (using bitwise OR '|') any number of the following constants:
+ *     - PIO_PULLUP
+ *     - PIO_DEGLITCH
+ *     - PIO_DEBOUNCE
+ *     - PIO_OPENDRAIN
+ *     - PIO_IT_LOW_LEVEL
+ *     - PIO_IT_HIGH_LEVEL
+ *     - PIO_IT_FALL_EDGE
+ *     - PIO_IT_RISE_EDGE
+ */
+typedef struct _Pin
+{
+    /*  Bitmask indicating which pin(s) to configure. */
+    uint32_t mask;
+    /*  Pointer to the PIO controller which has the pin(s). */
+    Pio    *pio;
+    /*  Peripheral ID of the PIO controller which has the pin(s). */
+    uint8_t id;
+    /*  Pin type. */
+    uint8_t type;
+    /*  Pin attribute. */
+    uint8_t attribute;
+} Pin ;
+
+/*
+ *         Global Access Macros
+ */
+
+/*
+ *         Global Functions
+ */
+
+extern uint8_t PIO_Configure( const Pin *list, uint32_t size ) ;
+
+extern void PIO_Set( const Pin *pin ) ;
+
+extern void PIO_Clear( const Pin *pin ) ;
+
+extern uint8_t PIO_Get( const Pin *pin ) ;
+
+extern uint8_t PIO_GetOutputDataStatus( const Pin *pin ) ;
+
+extern void PIO_SetDebounceFilter( const Pin *pin, uint32_t cuttoff );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* #ifndef _PIO_ */
+