disk.h

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

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

----------------- File Information ---------------------------------------------
       File Name: DISK.H
Last Modify Date: 9/19/2006
     Discription: Logical disk 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 __DISK_H__
#define __DISK_H__



#ifndef MAX_DRIVES
#define MAX_DRIVES                  1     // Max logical disks can be loaded concurrently
#endif


/* Low level driver command */
#define DISK_INIT                   0
#define DISK_CLOSE                  1
#define DISK_READ_SECTOR            2
#define DISK_WRITE_SECTOR           3
#define DISK_CREATE_BOOT_SECTOR		4

/* Low level driver return code */
#define DISK_READ_OK                0x01
#define DISK_READ_NOT_OK            0x80
#define DISK_WRITE_OK               0x02
#define DISK_WRITE_NOT_OK           0x82
#define DISK_INIT_OK                0x03
#define DISK_INIT_NOT_OK            0x83
#define BAD_DISK_COMMAND            0xFFFF



/* Empty logical driver, not used now  */
#define EMPTY_DRIVE                 0xFF



/* Low level driver parameter strucure */
typedef struct _Disk_RW_Parameter
{
	INT8U       Drive;          // Logical disk number
	INT32U      SectorIndex;    // Sector number
	INT32U      RsvdForLow;     // Reserved for low level driver,copy from _Disk_Info
	INT8U       *Buf;           // Data buffer
} Disk_RW_Parameter;



/* Logical disk information structure */
typedef struct _Disk_Info
{
	INT8U       Drive;          // Logical disk number
	INT8U       FATType;        // FAT type: FAT12,FAT16,FAT32
	INT8U       SecPerClus;     // Sector per cluster
	INT8U       NumFATs;        // NO. of FAT

	INT32U      SecPerDisk;     // Sectors per disk
	INT32U      BytsPerSec;     // Bytes per sector
	INT32U      RootDirTable;   // Roor dir start sector(FAT32:start cluster)
	INT32U      RootSecCnt;     // Sectors of root dir
	INT32U      FATStartSec;    // Start sector of FAT
	INT32U      FATSecCnt;      // Sectors per FAT
	INT32U      DataStartSec;   // Start sector of data
	INT32U      ClusPerData;    // Clusters of data
	INT32U      PathClusIndex;  // Start cluster of current dir FAT,0-root dir
	INT32U      RsvdForLow;     // Reserved for low level driver

	INT16U  (* DiskCommand)( INT8U Cammand, void *Parameter );
                               // Driver
} Disk_Info;


extern Disk_Info DiskInfo[MAX_DRIVES];     // Logical disk information

extern void DiskInit( void );

extern Disk_Info * GetDiskInfo( INT8U Drive );

extern Disk_Info * GetEmptyDiskInfoAddr( void );

extern void AddFileDriver( INT16U  (* DiskCommand)(INT8U Cammand, void *Parameter) );

extern void RemoveFileDriver( INT8U Drive );


#endif  /* #ifndef __DISK_H__ */