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diff --git a/components/dac-at73c213/at73c213.h b/components/dac-at73c213/at73c213.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
+/// 
+/// Definitions and methods for using a single external AT73C213 DAC. Several
+/// constants must be declared at the board.h level for that:
+/// - BOARD_AT73C213_SPI
+/// - BOARD_AT73C213_SPI_ID 
+/// - BOARD_AT73C213_NPCS
+/// - BOARD_AT73C213_SSC
+/// - BOARD_AT73C213_SSC_ID
+///
+/// !Usage
+/// 
+/// -# Configure the mode register of the SPI associated with the DAC and
+///    enable the SPI peripheral (see spi.h).
+/// -# Enable the master clock of the DAC (usually, it will be connected to
+///    a programmable clock output).
+/// -# Call the AT73C213_Enable function with the desired parameters. This
+///    function configures the associated NPCS register of the SPI for correct
+///    interfacing with the DAC, starts the DAC and configures the SSC.
+/// -# Send audio data to the DAC using the SSC, with SSC_WriteBuffer or
+///    SSC_Write.
+//------------------------------------------------------------------------------
+
+#ifndef AT73C213_H
+#define AT73C213_H
+
+//------------------------------------------------------------------------------
+//         Definitions
+//------------------------------------------------------------------------------
+
+// Master Clock Selector
+#define AT73C213_MCK_SEL_256_FS 0
+#define AT73C213_MCK_SEL_384_FS 1
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+extern void AT73C213_Enable(unsigned int Fs,
+                            unsigned int sampleSize,
+                            unsigned int numChannels,
+                            unsigned char isClock384,
+                            unsigned int masterClock);
+extern void AT73C213_Disable();
+extern void AT73C213_SetMuteStatus(unsigned char leftChannelMuted,
+                                   unsigned char rightChannelMuted);
+
+#endif //#ifndef AT73C213_H
+