ATMEL公司AT89C51SND1为主控制器MP3源代码

				/*H**************************************************************************
				* NAME:         song_drv.h
				*----------------------------------------------------------------------------
				* Copyright (c) 2003 Atmel.
				*----------------------------------------------------------------------------
				* RELEASE:      snd1c-refd-nf-4_0_3      
				* REVISION:     1.11     
				*----------------------------------------------------------------------------
				* PURPOSE
				* This file contains the song driver definition
				*****************************************************************************/
				
				#ifndef _SONG_DRV_H_
				#define _SONG_DRV_H_
				
				/*_____ I N C L U D E S ____________________________________________________*/
				
				
				/*_____ M A C R O S ________________________________________________________*/
				
				#define NB_SOUND        (Byte)5
				
				#define SND_VOLUME      (Byte)0
				#define SND_BASS        (Byte)1
				#define SND_MEDIUM      (Byte)2
				#define SND_TREBLE      (Byte)3
				#define SND_BBOOST      (Byte)4
				
				#define VOLUME_MAX      (Byte)31
				#define BASS_MAX        (Byte)31
				#define MEDIUM_MAX      (Byte)31
				#define TREBLE_MAX      (Byte)31
				#define BBOOST_MAX      (Byte)1
				
				#define VOLUME_MIN      (Byte)0
				#define BASS_MIN        (Byte)0
				#define MEDIUM_MIN      (Byte)0
				#define TREBLE_MIN      (Byte)0
				#define BBOOST_MIN      (Byte)0
				
				#define VOLUME_MED      (Byte)15
				#define BASS_MED        (Byte)15
				#define MEDIUM_MED      (Byte)15
				#define TREBLE_MED      (Byte)15
				#define BBOOST_MED      (Byte)0
				
				/* MP3 Frame Header */
				#define MP3_SYNC_H      (Byte)0xFF
				#define MP3_SYNC_L      (Byte)0xF0
				#define MP3_MSK_SYNC    (Byte)0xF0
				#define MP3_MSK_VER     (Byte)0x08
				#define MP3_LAYER_III   (Byte)0x02
				#define MP3_MSK_LAYER   (Byte)0x06
				#define MP3_BR_FREE     (Byte)0x00
				#define MP3_BR_224      (Byte)0xC0
				#define MP3_BR_256      (Byte)0xD0
				#define MP3_BR_320      (Byte)0xE0
				#define MP3_BR_112      (Byte)0xB0
				#define MP3_BR_144      (Byte)0xD0
				#define MP3_BR_160      (Byte)0xE0
				#define MP3_MSK_BR      (Byte)0xF0
				#define MP3_FS_22       (Byte)0x00
				#define MP3_FS_24       (Byte)0x01
				#define MP3_FS_16       (Byte)0x02
				#define MP3_FS_44       (Byte)0x04
				#define MP3_FS_48       (Byte)0x05
				#define MP3_FS_32       (Byte)0x06
				#define MP3_MSK_FS      (Byte)0x0C
				#define MP3_MSK_EMP     (Byte)0x01
				
				/* song_init() Return */
				#define SONG_MAX_ERR    (Byte)100
				#define SONG_NO_ERR     (Byte)0x00          /* each error coded on 1 bit */
				#define SONG_LAYER_ERR  (Byte)0x01
				#define SONG_BR_ERR     (Byte)0x02
				#define SONG_FS_ERR     (Byte)0x04
				#define SONG_SYNC_ERR   (Byte)0x08
				
				
				/*_____ D E F I N I T I O N ________________________________________________*/
				
				
				/*_____ D E C L A R A T I O N ______________________________________________*/
				
				Byte    song_init (void);
				void    song_start (void);
				void    song_pause (void);
				void    song_stop (void);
				
				void    song_snd_init (void);
				void    song_snd_inc (void);
				void    song_snd_dec (void);
				void    song_snd_select (void);
				Byte    song_get_sound (void);
				Byte    song_get_level (void);
				
				
				#endif  /* _SONG_DRV_H_ */