rwsec.h

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/*******************************************************************************

   (C) Copyright 2006, RAE Systems Inc. 	 All rights reserved

----------------- File Information ---------------------------------------------
       File Name: RWSEC.H
Last Modify Date: 9/19/2006
     Discription: Cache management header file

---------------- Important Notes -----------------------------------------------


----------------- Rivision History ---------------------------------------------
         Version: V1.00
Last Modify Date: 9/17/2006
     Discription: Initial version, imported from ZLG_FS V1.00, derived from FAT.H

*******************************************************************************/

#ifndef __RWSEC_H__
#define __RWSEC_H__



#ifndef DISK_CACHE_SIZE
// Cache size(byte), should be the maximum sector bytes
#define DISK_CACHE_SIZE             512
#endif

#ifndef MAX_DISK_CACHES
#define MAX_DISK_CACHES             2          // Cache number
#endif

/* Cache flags definition */
#define CACHE_READED                0x02
#define CACHE_WRITED                0x01

/* File system cache data structure */
typedef struct _Disk_Cache
{
	INT8U       Drive;          			// Logical disk number
	INT8U       Flag;           			// Flags
	INT16U      RW_ID;          			// Write/Read ID, used for cache release
//	INT8U       Lock;           			// Lock sector?
	INT32U      SecIndex;       			// Sector index of cached
	INT8U       buf[DISK_CACHE_SIZE]; 	// Buffer
} Disk_cache;


extern Disk_cache DiskCache[MAX_DISK_CACHES];      /* Disk cache */


extern void CacheInit(void);

extern void CloseSec(INT8U Drive, INT32U Index);

extern void CacheWriteBack2(INT16U Index);

extern void CacheWriteBack(INT8U Drive, INT32U Index);

extern void AllCacheWriteBack(void);

extern INT16U GetCache(void);

extern INT8U *OpenSec(INT8U Drive, INT32U Index);

extern INT8U ReadSec(INT8U Drive, INT32U Index);

extern void WriteSec(INT8U Drive, INT32U Index);


#endif  /* #ifndef __RWSEC_H__ */