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diff --git a/at91lib/peripherals/usart/usart.h b/at91lib/peripherals/usart/usart.h
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+/* ----------------------------------------------------------------------------
+ *         ATMEL Microcontroller Software Support 
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \dir
+/// !Purpose
+/// 
+/// This module provides several definitions and methods for using an USART
+/// peripheral.
+///
+/// !Usage
+/// -# Enable the USART peripheral clock in the PMC.
+/// -# Enable the required USART PIOs (see pio.h).
+/// -# Configure the UART by calling USART_Configure.
+/// -# Enable the transmitter and/or the receiver of the USART using
+///    USART_SetTransmitterEnabled and USART_SetReceiverEnabled.
+/// -# Send data through the USART using the USART_Write and
+///    USART_WriteBuffer methods.
+/// -# Receive data from the USART using the USART_Read and
+///    USART_ReadBuffer functions; the availability of data can be polled
+///    with USART_IsDataAvailable.
+/// -# Disable the transmitter and/or the receiver of the USART with
+///    USART_SetTransmitterEnabled and USART_SetReceiverEnabled.
+//------------------------------------------------------------------------------
+
+#ifndef USART_H
+#define USART_H
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include <board.h>
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// \page "USART modes"
+/// This page lists several common operating modes for an USART peripheral.
+/// 
+/// !Modes
+/// - USART_MODE_ASYNCHRONOUS
+/// - USART_MODE_IRDA
+
+/// Basic asynchronous mode, i.e. 8 bits no parity.
+#define USART_MODE_ASYNCHRONOUS (AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE)
+
+/// IRDA mode
+#define USART_MODE_IRDA         (AT91C_US_USMODE_IRDA | AT91C_US_CHRL_8_BITS | AT91C_US_PAR_NONE | AT91C_US_FILTER)
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+extern void USART_Configure(
+    AT91S_USART *usart,
+    unsigned int mode,
+    unsigned int baudrate,
+    unsigned int masterClock);
+
+extern void USART_SetTransmitterEnabled(AT91S_USART *usart, unsigned char enabled);
+
+extern void USART_SetReceiverEnabled(AT91S_USART *usart, unsigned char enabled);
+
+extern void USART_Write(
+    AT91S_USART *usart, 
+    unsigned short data, 
+    volatile unsigned int timeOut);
+
+extern unsigned char USART_WriteBuffer(
+    AT91S_USART *usart,
+    void *buffer,
+    unsigned int size);
+
+extern unsigned short USART_Read(
+    AT91S_USART *usart, 
+    volatile unsigned int timeOut);
+
+extern unsigned char USART_ReadBuffer(
+    AT91S_USART *usart,
+    void *buffer,
+    unsigned int size);
+
+extern unsigned char USART_IsDataAvailable(AT91S_USART *usart);
+
+extern void USART_SetIrdaFilter(AT91S_USART *pUsart, unsigned char filter);
+
+#endif //#ifndef USART_H
+