bfsa_internal.h

ATMEL公司的demo程序,USB驱动程序,与识别片上flash,并进行枚举和操作.

//  ----------------------------------------------------------------------------
//          ATMEL Microcontroller Software Support  -  ROUSSET  -
//  ----------------------------------------------------------------------------
//  DISCLAIMER:  CONDITIONS AS PER SIGNED LIMITED LICENSE AGREEMENT (AT91
//  SOFTWARE AND USER DOCUMENTATION)
//  ALL SOFTWARE IS PROVIDED AS IS, WITH ALL FAULTS, AND WITH NO WARRANTY
//  WHATSOEVER.  ATMEL EXPRESSLY DISCLAIMS ALL WARRANTIES, EXPRESS, IMPLIED,
//  OR STATUTORY, INCLUDING WITHOUT LIMITATION ANY WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.
//  ----------------------------------------------------------------------------
// File Name           : bfsa_internal.h
// Object              : internal functions and definition for the Basic File System FAT12
// Creation            : FB  10/feb/2005
// Modif               : JCB 15/apr/2005
// --------------------------------------------------------------------------
#ifndef __bfsa_internal__
#define __bfsa_internal__

// **************************************************
//     Internal definitions
// **************************************************
#define LOW_BYTE(x) (unsigned char)(x&0x00FFU)
#define HIGH_BYTE(x) (unsigned char)((x&0xFF00U)>>8)
// Finding the Starting Sector : subtract 2 from the cluster number and multiply 
// the result by the disk's sectors per cluster.
#define FIRST_SECTOR_DATACLUSTER(x) (((x-2)*BFSA_media.SectPerCluster) + BFSA_media.ClusterStart)

// **************************************************
//     Internal definitions
// **************************************************
typedef struct _CUR_DIR
{
  char    absolutePath[BFSA_MAX_PATH_LEN];
  USHORT  DirStart;               // Sector where the directory structure starts
  UCHAR   IsRoot;
}CURRENT_DIR, *pCURRENT_DIR;

// **************************************************
//     FAT 12/16
// **************************************************
#define BPB_SIZE                62
#define DIRECTORY_ENTRIE_SIZE   32

#define EOC16                   0xFFFF      // End of cluster FAT16
#define EOC12                   0x0FFF      // End of cluster FAT12

#define BAD16                   0xFFF7      // Bad cluster FAT16 Cluster contains bad sectors
#define BAD12                   0x0FF7      // Bad cluster FAT12 Cluster contains bad sectors

#define FREE                    0x0000      // Free cluster

/**************************************************/
/* Special value for DIR_Name[0] */

#define FREE_ENTRY_DIR_AND_NO_ALLOCATED 0x00 
// directory entry is free (same as for 0xE5), 
//   and there are no allocated directory entries after this one

#define FREE_ENTRY_DIR_2 0x05 
/* The actual file name character for this byte is 0xE5 */
#define FREE_ENTRY_DIR   0xE5 /* directory entry is free */

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

// **************************************************
//     Global data
// **************************************************
extern CURRENT_DIR     BFSA_current_dir;
extern MEDIA_INFO      BFSA_media;
extern UCHAR*          FlashBaseAdd;
extern const           ULONG FlashSize;

// **************************************************
//     Internal Functions
// **************************************************
extern void   readFAT(void);
extern ULONG  writeFAT(void);
extern USHORT readFatEntry(USHORT cluster);
extern ULONG  writeFatEntry(USHORT cluster,USHORT value);

extern USHORT findFreeCluster(void);
extern ULONG getNextCluster(USHORT uCurrent);
extern ULONG addNewEntry(UCHAR newEntry[32],USHORT dirCluster, UCHAR isRoot);
extern void deleteEntry(char* fileName);
extern int findEntry(char *fileName);
extern ULONG readBPB(UCHAR *pucBuff, USHORT uSize);

extern UCHAR isValidFileName(char *fileName);
extern USHORT findFile(const char* fileName);
extern ULONG deleteFile(char* filename);
extern ULONG listFile(FILE_OBJECT* pfobj,ULONG nbFileObj,ULONG *nbFileObjFound,USHORT dirCluster);
extern void padFileName(const char *filename, char* strFileName);

#endif  //__bfsa_internal__