clock.h

来自「这是atmel公司的89C51SND1C的mp3源程序」· C头文件 代码 · 共 51 行

/*H**************************************************************************
* $RCSfile: clock.h,v $
*----------------------------------------------------------------------------
* Copyright (c) 2002 Atmel.
*----------------------------------------------------------------------------
* RELEASE:      $Name: DEMO_FAT_1_2_5 $      
* REVISION:     $Revision: 1.2 $     
* FILE_CVSID:   $Id: clock.h,v 1.2 2002/06/06 15:17:11 ffosse Exp $       
*----------------------------------------------------------------------------
* PURPOSE:
* This file contains the clock definition
*****************************************************************************/

#ifndef _CLOCK_H_
#define _CLOCK_H_

/*_____ I N C L U D E S ____________________________________________________*/

#include "..\..\..\..\lib\pll\pll_drv.h"      /* clock driver definition */


/*_____ M A C R O S ________________________________________________________*/

#define _256Fs              0       /* HLR = 0 => 256 Fs */
#define _384Fs              1       /* HLR = 1 => 384 Fs */

#define VOC_FREQ            3       /* 8 KHz index in freq tables */
#define USB_FREQ            7       /* 96 MHz index for USB */


/*_____ D E F I N I T I O N ________________________________________________*/
                                    /* Fpll = Fosc * (R+1) / (N+1) */
typedef struct { Uint16 r_div;      /* pll R divider */
                 Byte   n_div;      /* pll N divider */
                 Byte   mp3_div;    /* mp3 clock - 1 divider */
                 Byte   aud_div;    /* audio clock - 1 divider */
                 Byte   dac_over;   /* 256 or 384 Fs oversampling freq */
               } St_clock;


/*_____ D E C L A R A T I O N ______________________________________________*/

void    clock_song_init (Byte);
void    clock_voice_init (void);
void    clock_usb_init (void);
void    clock_disable (void);


#endif  /* _CLOCK_H_ */