halvol.h

威望公司MP3 + USB MCU 的参考软件

/****************************************************************
*                      Viaon Technology (Suzhou) Co.,Ltd
*
*    Copyright 2007, Viaon Technology (Suzhou) Co.,Ltd,Suzhou,China
*                    All rights reserved.
*
*
* Filename:      	halvol.h
*
* Programmer:    	Greg 
*
* Created: 	 	1/2/2008
*
* Description: 		public functions 
*              
*        
* Change History (most recent first):	2008.1.2
****************************************************************/
#ifndef __HALVOL_H__
#define __HALVOL_H__

//Volume smooth status definition for FSM
#define SMOOTH_CAUSE_VOLDOWN 	0X10
#define SMOOTH_CAUSE_OVER 	0X11
#define SMOOTH_CAUSE_VOLUP 	0X12
#define SMOOTH_CAUSE_IDLE		0X13

//Volume level 
#define VOLLEVEL_DEFAULT	12
#define VOLLEVEL_MAX	16
#define VOLLEVEL_MIN	0
#define VOLLEVEL_SMTHLOW	0

//Volume adjustment step
#define VOL_DOWN_STEP   1
#define VOL_SMTHDOWN_STEP   12

#define VOL_SMTH_BEGIN		0X06	//unit 100ms

//API for volume control.
void halVolInit(void);
BYTE halVolGet(void);
void halVolSet(BYTE bVol);
BYTE halVolUp(void);
BYTE halVolDown(void);
void halVolSmthSet(BYTE bVol, BYTE bSta, BYTE bBeg);
void halVolSmthFSM(void);

#endif