auddspeakerchannel.h

本代bootloader通过usb下载代码首先存放在sdram中

/* ----------------------------------------------------------------------------
 *         ATMEL Microcontroller Software Support 
 * ----------------------------------------------------------------------------
 * Copyright (c) 2008, Atmel Corporation
 *
 * All rights reserved.
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 * modification, are permitted provided that the following conditions are met:
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 * Atmel's name may not be used to endorse or promote products derived from
 * this software without specific prior written permission.
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/**
    \unit

    !Purpose

        Manipulation of the channels of an USB audio speaker device.

    !Usage

        -# Initialize a AUDDSpeakerChannel instance using
           AUDDSpeakerChannel_Initialize.
        -# Retrieves the current status of a channel with the
           AUDDSpeakerChannel_IsMuted method.
        -# Re-implement the AUDDSpeakerChannel_MuteChanged callback to get
           notified when the status of a channel changes.
*/

#ifndef AUDDSPEAKERCHANNEL_H
#define AUDDSPEAKERCHANNEL_H

//------------------------------------------------------------------------------
//         Types
//------------------------------------------------------------------------------

//------------------------------------------------------------------------------
/// Modelizes a channel of an USB audio speaker device.
//------------------------------------------------------------------------------
typedef struct {

    /// Zero-based channel number in the audio function.
    unsigned char number;
    /// Indicates if the channel is currently muted.
    unsigned char muted;

} AUDDSpeakerChannel;

//------------------------------------------------------------------------------
//         Callbacks
//------------------------------------------------------------------------------

extern void AUDDSpeakerChannel_MuteChanged(AUDDSpeakerChannel *channel,
                                           unsigned char muted);

//------------------------------------------------------------------------------
//         Exported functions
//------------------------------------------------------------------------------

extern void AUDDSpeakerChannel_Initialize(AUDDSpeakerChannel *channel,
                                          unsigned char number,
                                          unsigned char muted);

extern unsigned char AUDDSpeakerChannel_GetNumber(
    const AUDDSpeakerChannel *channel);

extern void AUDDSpeakerChannel_Mute(AUDDSpeakerChannel *channel);

extern void AUDDSpeakerChannel_Unmute(AUDDSpeakerChannel *channel);

extern unsigned char AUDDSpeakerChannel_IsMuted(
    const AUDDSpeakerChannel *channel);

#endif //#ifndef AUDDSPEAKERCHANNEL_H