Atmel provided hardware specifics.

Demo/Common/drivers/Atmel/at91lib/peripherals/ac97c/ac97c.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.
+ * ----------------------------------------------------------------------------
+ */
+
+
+#ifndef AC97C_H
+#define AC97C_H
+
+//------------------------------------------------------------------------------
+//         Constants
+//------------------------------------------------------------------------------
+
+/// The channel is already busy with a transfer.
+#define AC97C_ERROR_BUSY            1
+/// The transfer has been stopped by the user.
+#define AC97C_ERROR_STOPPED         2
+
+/// Codec channel index.
+#define AC97C_CHANNEL_CODEC	        0
+/// Channel A index.
+#define AC97C_CHANNEL_A	            1
+/// Channel B index.
+#define AC97C_CHANNEL_B	            2
+
+/// Codec transmit/receive transfer index.
+#define AC97C_CODEC_TRANSFER        0
+/// Channel A receive transfer index.
+#define AC97C_CHANNEL_A_RECEIVE     1
+/// Channel A transmit transfer index.
+#define AC97C_CHANNEL_A_TRANSMIT    2
+/// Channel B receive transfer index.
+#define AC97C_CHANNEL_B_RECEIVE     3
+/// Channel B transmit transfer index.
+#define AC97C_CHANNEL_B_TRANSMIT    4
+
+//------------------------------------------------------------------------------
+//         Types
+//------------------------------------------------------------------------------
+
+/// AC97C transfer callback function.
+typedef void (*Ac97Callback)(void *pArg,
+                             unsigned char status,
+                             unsigned int remaining);
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+extern void AC97C_Configure();
+
+extern void AC97C_ConfigureChannel(unsigned char channel, unsigned int cfg);
+
+extern void AC97C_AssignInputSlots(unsigned char channel, unsigned int slots);
+
+extern void AC97C_AssignOutputSlots(unsigned char channel, unsigned int slots);
+
+extern unsigned char AC97C_Transfer(
+				unsigned char channel,
+				unsigned char *pBuffer,
+				unsigned int numSamples,
+				Ac97Callback callback,
+				void *pArg);
+
+extern unsigned char AC97C_IsFinished(unsigned char channel);
+
+extern void AC97C_WriteCodec(unsigned char address, unsigned short data);
+
+extern unsigned short AC97C_ReadCodec(unsigned char address);
+
+extern void AC97C_SetChannelSize(unsigned char channel, unsigned char size);
+
+extern void AC97C_CancelTransfer(unsigned char channel);
+
+#endif //#ifndef AC97C_H
+