Matthias
6cc948eef8
git-svn-id: file:///srv/dev-disk-by-uuid-17e88007-4d0c-45e0-8757-cacfcc458630/repositories/svn/Diplomarbeit@113 9fe90eed-be63-e94b-8204-d34ff4c2ff93
990 lines
32 KiB
C
990 lines
32 KiB
C
/* ---------------------------------------------------------------------------
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* FAT_intern.c (C)ChaN, 2008
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* ---------------------------------------------------------------------------
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* Micro-key bv
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* Industrieweg 28, 9804 TG Noordhorn
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* Postbus 92, 9800 AB Zuidhorn
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* The Netherlands
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* Tel: +31 594 503020
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* Fax: +31 594 505825
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* Email: support@microkey.nl
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* Web: www.microkey.nl
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* ---------------------------------------------------------------------------
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* Description: FatFs - FAT file system module R0.06
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*
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* The FatFs module is an experimenal project to implement FAT file system to
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* cheap microcontrollers. This is a free software and is opened for education,
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* research and development under license policy of following trems.
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*
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* Copyright (C) 2008, ChaN, all right reserved.
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*
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* The FatFs module is a free software and there is no warranty.
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* You can use, modify and/or redistribute it for personal, non-profit or
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* commercial use without restriction under your responsibility.
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* Redistributions of source code must retain the above copyright notice.
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* ---------------------------------------------------------------------------
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* Last Change: 0.2, Aug 11, 2008, MMi
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* Edited to fit into LAN_2636 Project
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*
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*----------------------------------------------------------------------------
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* Feb 26,'06 R0.00 Prototype.
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*
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* Apr 29,'06 R0.01 First stable version.
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*
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* Jun 01,'06 R0.02 Added FAT12 support.
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* Removed unbuffered mode.
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* Fixed a problem on small (<32M) patition.
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* Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
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*
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* Sep 22,'06 R0.03 Added f_rename().
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* Changed option _FS_MINIMUM to _FS_MINIMIZE.
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* Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast.
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* Fixed f_mkdir() creates incorrect directory on FAT32.
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*
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* Feb 04,'07 R0.04 Supported multiple drive system.
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* Changed some interfaces for multiple drive system.
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* Changed f_mountdrv() to f_mount().
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* Added f_mkfs().
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* Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive.
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* Added a capability of extending file size to f_lseek().
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* Added minimization level 3.
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* Fixed an endian sensitive code in f_mkfs().
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* May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
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* Added FSInfo support.
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* Fixed DBCS name can result FR_INVALID_NAME.
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* Fixed short seek (<= csize) collapses the file object.
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*
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* Aug 25,'07 R0.05 Changed arguments of f_read(), f_write() and f_mkfs().
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* Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
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* Fixed f_mkdir() on FAT32 creates incorrect directory.
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* Feb 03,'08 R0.05a Added f_truncate() and f_utime().
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* Fixed off by one error at FAT sub-type determination.
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* Fixed btr in f_read() can be mistruncated.
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* Fixed cached sector is not flushed when create and close
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* without write.
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*
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* Apr 01,'08 R0.06 Added fputc(), fputs(), fprintf() and fgets().
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* Improved performance of f_lseek() on moving to the same
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* or following cluster.
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*---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* System include files
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* ---------------------------------------------------------------------------
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*/
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/* Compiler includes */
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#include <string.h>
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#include "LPC23xx.h"
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#include "types.h"
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/* FreeRTOS includes */
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#include "FreeRTOS.h"
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#include "task.h"
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/* ---------------------------------------------------------------------------
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* Application include files
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* ---------------------------------------------------------------------------
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*/
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#include "fat_intern.h" /* FatFs declarations */
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#include "fat_public.h"
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#include "fat_diskio.h" /* Include file for user provided disk functions */
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#include "fat_time.h" /* Get time from RTC */
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/* ---------------------------------------------------------------------------
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* Local constant and macro definitions
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Global variable definitions
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* ---------------------------------------------------------------------------
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*/
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/* ---------------------------------------------------------------------------
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* Local variable definitions
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* ---------------------------------------------------------------------------
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*/
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FATFS *FatFs[_DRIVES] = {0,0}; /* Pointer to file system objects */
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/* (logical drives) */
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UINT16 fsid; /* File system mount ID */
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/* ---------------------------------------------------------------------------
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* Local function definitions
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* ---------------------------------------------------------------------------
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*/
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BOOLEAN move_window (FATFS *fs, UINT32 sector)
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{
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UINT32 wsect;
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wsect = fs->winsect;
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if (wsect != sector)
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{
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/* Changed current window */
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#if !_FS_READONLY /* If write-access granted */
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UINT8 n;
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if (fs->winflag)
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{
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/* Write back dirty window if needed */
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if (disk_write(fs->drive, fs->win, wsect, 1) != RES_OK)
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return FALSE;
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fs->winflag = 0;
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if (wsect < (fs->fatbase + fs->sects_fat))
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{
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/* In FAT area */
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for (n = fs->n_fats; n >= 2; n--)
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{
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/* Refrect the change to FAT copy */
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wsect += fs->sects_fat;
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disk_write(fs->drive, fs->win, wsect, 1);
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}
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}
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}
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#endif
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if (sector)
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{
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if (disk_read(fs->drive, fs->win, sector, 1) != RES_OK)
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{
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return FALSE;
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}
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fs->winsect = sector;
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}
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}
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return TRUE;
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}
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#if !_FS_READONLY
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FRESULT sync (FATFS *fs)
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{
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fs->winflag = 1;
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if (!move_window(fs, 0))
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return FR_RW_ERROR;
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#if _USE_FSINFO
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/* Update FSInfo sector if needed */
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if (fs->fs_type == FS_FAT32 && fs->fsi_flag)
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{
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fs->winsect = 0;
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memset(fs->win, 0, 512);
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ST_WORD(&fs->win[BS_55AA], 0xAA55);
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ST_DWORD(&fs->win[FSI_LeadSig], 0x41615252);
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ST_DWORD(&fs->win[FSI_StrucSig], 0x61417272);
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ST_DWORD(&fs->win[FSI_Free_Count], fs->free_clust);
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ST_DWORD(&fs->win[FSI_Nxt_Free], fs->last_clust);
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disk_write(fs->drive, fs->win, fs->fsi_sector, 1);
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fs->fsi_flag = 0;
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}
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#endif
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/* Make sure that no pending write process in the physical drive */
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if (disk_ioctl(fs->drive, CTRL_SYNC, NULL) != RES_OK)
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return FR_RW_ERROR;
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return FR_OK;
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}
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#endif
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UINT32 get_cluster (FATFS *fs, UINT32 clust)
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{
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UINT16 wc, bc;
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UINT32 fatsect;
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if (clust >= 2 && clust < fs->max_clust)
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{
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/* Is it a valid cluster number? */
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fatsect = fs->fatbase;
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switch (fs->fs_type)
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{
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case FS_FAT12:
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bc = (UINT16)clust * 3 / 2;
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if (!move_window(fs, fatsect + (bc / SS(fs))))
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break;
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wc = fs->win[bc & (SS(fs) - 1)];
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bc++;
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if (!move_window(fs, fatsect + (bc / SS(fs))))
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break;
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wc |= (UINT16)fs->win[bc & (SS(fs) - 1)] << 8;
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return (clust & 1) ? (wc >> 4) : (wc & 0xFFF);
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case FS_FAT16:
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if (!move_window(fs, fatsect + (clust / (SS(fs) / 2))))
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break;
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return LD_WORD(&fs->win[((UINT16)clust * 2) & (SS(fs) - 1)]);
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case FS_FAT32:
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if (!move_window(fs, fatsect + (clust / (SS(fs) / 4))))
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break;
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return LD_DWORD(&fs->win[((UINT16)clust * 4) & (SS(fs) - 1)]) & 0x0FFFFFFF;
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}
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}
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return 1; /* Out of cluster range, or an error occured */
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}
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#if !_FS_READONLY
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BOOLEAN put_cluster(FATFS *fs, UINT32 clust, UINT32 val)
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{
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UINT32 fatsect;
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UINT16 bc;
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UINT8 *p;
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fatsect = fs->fatbase;
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switch (fs->fs_type)
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{
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case FS_FAT12:
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bc = (UINT16)clust * 3 / 2;
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if (!move_window(fs, fatsect + (bc / SS(fs))))
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{
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return FALSE;
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}
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p = &fs->win[bc & (SS(fs) - 1)];
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*p = (clust & 1) ? ((*p & 0x0F) | ((UINT8)val << 4)) : (UINT8)val;
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bc++;
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fs->winflag = 1;
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if (!move_window(fs, fatsect + (bc / SS(fs))))
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{
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return FALSE;
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}
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p = &fs->win[bc & (SS(fs) - 1)];
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*p = (clust & 1) ? (UINT8)(val >> 4) : ((*p & 0xF0) | ((UINT8)(val
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>> 8) & 0x0F));
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break;
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case FS_FAT16:
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if (!move_window(fs, fatsect + (clust / (SS(fs) / 2))))
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{
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return FALSE;
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}
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ST_WORD(&fs->win[((UINT16)clust * 2) & (SS(fs) - 1)], (UINT16)val);
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break;
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case FS_FAT32:
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if (!move_window(fs, fatsect + (clust / (SS(fs) / 4))))
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{
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return FALSE;
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}
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ST_DWORD(&fs->win[((UINT16)clust * 4) & (SS(fs) - 1)], val);
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break;
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default:
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return FALSE;
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}
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fs->winflag = 1;
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return TRUE;
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}
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#endif /* !_FS_READONLY */
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#if !_FS_READONLY
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BOOLEAN remove_chain (FATFS *fs, UINT32 clust)
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{
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UINT32 nxt;
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while (clust >= 2 && clust < fs->max_clust)
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{
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nxt = get_cluster(fs, clust);
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if (nxt == 1)
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{
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return FALSE;
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}
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if (!put_cluster(fs, clust, 0))
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{
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return FALSE;
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}
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if (fs->free_clust != 0xFFFFFFFF)
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{
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fs->free_clust++;
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#if _USE_FSINFO
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fs->fsi_flag = 1;
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#endif
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}
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clust = nxt;
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}
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return TRUE;
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}
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#endif
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#if !_FS_READONLY
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UINT32 create_chain (FATFS *fs, UINT32 clust)
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{
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UINT32 cstat;
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UINT32 ncl;
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UINT32 scl;
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UINT32 mcl = fs->max_clust;
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if (clust == 0)
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{
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/* Create new chain */
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scl = fs->last_clust; /* Get suggested start point */
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if (scl == 0 || scl >= mcl)
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scl = 1;
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}
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else
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{
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/* Stretch existing chain */
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cstat = get_cluster(fs, clust); /* Check the cluster status */
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if (cstat < 2)
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{
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return 1; /* It is an invalid cluster */
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}
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if (cstat < mcl)
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{
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return cstat; /* Is already followed by cluster */
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}
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scl = clust;
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}
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ncl = scl; /* Start cluster */
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for (;;)
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{
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ncl++; /* Next cluster */
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if (ncl >= mcl)
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{
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/* Wrap around */
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ncl = 2;
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if (ncl > scl)
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return 0; /* No free custer */
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}
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cstat = get_cluster(fs, ncl); /* Get the cluster status */
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if (cstat == 0)
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{
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break; /* Found a free cluster */
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}
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if (cstat == 1)
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{
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return 1; /* Any error occured */
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}
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if (ncl == scl)
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{
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return 0; /* No free custer */
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}
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}
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if (!put_cluster(fs, ncl, 0x0FFFFFFF))
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{
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return 1; /* Mark the new cluster "in use" */
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}
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if (clust != 0 && !put_cluster(fs, clust, ncl))
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{
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return 1; /* Link it to previous one if needed*/
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}
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fs->last_clust = ncl; /* Update fsinfo */
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if (fs->free_clust != 0xFFFFFFFF)
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{
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fs->free_clust--;
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#if _USE_FSINFO
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fs->fsi_flag = 1;
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#endif
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}
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return ncl; /* Return new cluster number */
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}
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#endif /* !_FS_READONLY */
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UINT32 clust2sect(FATFS *fs, UINT32 clust)
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{
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clust -= 2;
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if (clust >= (fs->max_clust - 2))
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{
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return 0; /* Invalid cluster number */
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}
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return (clust * fs->csize + fs->database);
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}
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BOOLEAN next_dir_entry(DIR *dj)
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{
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UINT32 clust;
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UINT16 idx;
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idx = dj->index + 1;
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if ((idx & ((SS(dj->fs) - 1) / 32)) == 0)
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{
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/* Table sector changed? */
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dj->sect++; /* Next sector */
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if (dj->clust == 0)
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{
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/* In static table */
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if (idx >= dj->fs->n_rootdir)
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{
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return FALSE; /* Reached to end of table */
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}
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}
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else
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{
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/* In dynamic table */
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if (((idx / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0)
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{
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/* Cluster changed? */
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clust = get_cluster(dj->fs, dj->clust); /* Get next cluster */
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if (clust < 2 || clust >= dj->fs->max_clust)
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{
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/* Reached to end of table */
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return FALSE;
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}
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dj->clust = clust; /* Initialize for new cluster */
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dj->sect = clust2sect(dj->fs, clust);
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}
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}
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}
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dj->index = idx; /* Lower bits of dj->index indicates*/
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/* offset in dj->sect */
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return TRUE;
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}
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#if _FS_MINIMIZE <= 1
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void get_fileinfo (FILINFO *finfo, const UINT8 *dir)
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{
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UINT8 n;
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UINT8 c;
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UINT8 a;
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char *p;
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p = &finfo->fname[0];
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a = _USE_NTFLAG ? dir[DIR_NTres] : 0; /* NT flag */
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for (n = 0; n < 8; n++)
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{
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/* Convert file name (body) */
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c = dir[n];
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if (c == ' ')
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{
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break;
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}
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if (c == 0x05)
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{
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c = 0xE5;
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}
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if (a & 0x08 && c >= 'A' && c <= 'Z')
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{
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c += 0x20;
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}
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*p++ = c;
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}
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if (dir[8] != ' ')
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{
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/* Convert file name (extension) */
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*p++ = '.';
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for (n = 8; n < 11; n++)
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{
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c = dir[n];
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if (c == ' ')
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{
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break;
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}
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if (a & 0x10 && c >= 'A' && c <= 'Z')
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{
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c += 0x20;
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}
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*p++ = c;
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}
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}
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*p = '\0';
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finfo->fattrib = dir[DIR_Attr]; /* Attribute */
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finfo->fsize = LD_DWORD(&dir[DIR_FileSize]); /* Size */
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finfo->fdate = LD_WORD(&dir[DIR_WrtDate]); /* Date */
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finfo->ftime = LD_WORD(&dir[DIR_WrtTime]); /* Time */
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}
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#endif /* _FS_MINIMIZE <= 1 */
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char make_dirfile(const char **path, char *dirname)
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{
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UINT8 n;
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UINT8 t;
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UINT8 c;
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UINT8 a;
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UINT8 b;
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memset(dirname, ' ', 8+3); /* Fill buffer with spaces */
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a = 0;
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b = 0x18; /* NT flag */
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n = 0;
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t = 8;
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for (;;)
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{
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c = *(*path)++;
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if (c == '\0' || c == '/')
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{
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/* Reached to end of str or directory separator */
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if (n == 0)
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{
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break;
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}
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dirname[11] = _USE_NTFLAG ? (a & b) : 0;
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return c;
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}
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if (c <= ' ' || c == 0x7F)
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{
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break; /* Reject invisible chars */
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}
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if (c == '.')
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{
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if (!(a & 1) && n >= 1 && n <= 8)
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{
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/* Enter extension part */
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n = 8;
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t = 11;
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continue;
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}
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break;
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}
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if (_USE_SJIS && ((c >= 0x81 && c <= 0x9F) || /* Accept S-JIS code */
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(c >= 0xE0 && c <= 0xFC)))
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{
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if (n == 0 && c == 0xE5) /* Change heading \xE5 to \x05 */
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{
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c = 0x05;
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}
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a ^= 0x01;
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goto md_l2; /* LABEL SEE END OF FUNCTION */
|
|
}
|
|
if (c == '"')
|
|
{
|
|
break; /* Reject " */
|
|
}
|
|
if (c <= ')')
|
|
{
|
|
goto md_l1; /* LABEL SEE END OF FUNCTION */
|
|
}
|
|
/* Accept ! # $ % & ' ( ) */
|
|
if (c <= ',')
|
|
{
|
|
break; /* Reject * + , */
|
|
}
|
|
if (c <= '9')
|
|
{
|
|
goto md_l1;
|
|
}
|
|
/* Accept - 0-9 */
|
|
if (c <= '?')
|
|
{
|
|
break; /* Reject : ; < = > ? */
|
|
}
|
|
if (!(a & 1))
|
|
{
|
|
/* These checks are not applied to S-JIS 2nd byte */
|
|
if (c == '|')
|
|
{
|
|
break; /* Reject | */
|
|
}
|
|
if (c >= '[' && c <= ']')
|
|
{
|
|
break; /* Reject [ \ ] */
|
|
}
|
|
if (_USE_NTFLAG && c >= 'A' && c <= 'Z')
|
|
{
|
|
(t == 8) ? (b &= 0xF7) : (b &= 0xEF);
|
|
}
|
|
if (c >= 'a' && c <= 'z')
|
|
{
|
|
/* Convert to upper case */
|
|
c -= 0x20;
|
|
if (_USE_NTFLAG)
|
|
{
|
|
(t == 8) ? (a |= 0x08) : (a |= 0x10);
|
|
}
|
|
}
|
|
}
|
|
/* GOTO LABELS */
|
|
md_l1: a &= 0xFE;
|
|
md_l2: if (n >= t)
|
|
{
|
|
break;
|
|
}
|
|
dirname[n++] = c;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
FRESULT trace_path (DIR *dj, char *fn, const char *path, UINT8 **dir)
|
|
{
|
|
UINT32 clust;
|
|
char ds;
|
|
UINT8 *dptr = NULL;
|
|
FATFS *fs = dj->fs;
|
|
|
|
/* Initialize directory object */
|
|
clust = fs->dirbase;
|
|
if (fs->fs_type == FS_FAT32)
|
|
{
|
|
dj->clust = dj->sclust = clust;
|
|
dj->sect = clust2sect(fs, clust);
|
|
}
|
|
else
|
|
{
|
|
dj->clust = dj->sclust = 0;
|
|
dj->sect = clust;
|
|
}
|
|
dj->index = 0;
|
|
|
|
if (*path == '\0')
|
|
{
|
|
/* Null path means the root directory */
|
|
*dir = NULL;
|
|
return FR_OK;
|
|
}
|
|
|
|
for (;;)
|
|
{
|
|
ds = make_dirfile(&path, fn); /* Get a paragraph into fn[] */
|
|
if (ds == 1)
|
|
{
|
|
return FR_INVALID_NAME;
|
|
}
|
|
for (;;)
|
|
{
|
|
if (!move_window(fs, dj->sect))
|
|
{
|
|
return FR_RW_ERROR;
|
|
}
|
|
/* Pointer to the directory entry */
|
|
dptr = &fs->win[(dj->index & ((SS(fs) - 1) / 32)) * 32];
|
|
if (dptr[DIR_Name] == 0) /* Has it reached to end of dir? */
|
|
{
|
|
return !ds ? FR_NO_FILE : FR_NO_PATH;
|
|
}
|
|
if (dptr[DIR_Name] != 0xE5 /* Matched? */
|
|
&& !(dptr[DIR_Attr] & AR_VOL)
|
|
&& !memcmp(&dptr[DIR_Name], fn, 8+3))
|
|
{
|
|
break;
|
|
}
|
|
if (!next_dir_entry(dj)) /* Next directory pointer */
|
|
{
|
|
return !ds ? FR_NO_FILE : FR_NO_PATH;
|
|
}
|
|
}
|
|
if (!ds)
|
|
{
|
|
*dir = dptr;
|
|
return FR_OK;
|
|
} /* Matched with end of path */
|
|
if (!(dptr[DIR_Attr] & AR_DIR))
|
|
{
|
|
return FR_NO_PATH; /* Cannot trace because it is a file*/
|
|
}
|
|
/* Get cluster# of the directory */
|
|
clust = ((UINT32)LD_WORD(&dptr[DIR_FstClusHI]) << 16)
|
|
| LD_WORD(&dptr[DIR_FstClusLO]);
|
|
/* Restart scanning at the new directory */
|
|
dj->clust = dj->sclust = clust;
|
|
dj->sect = clust2sect(fs, clust);
|
|
dj->index = 2;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
#if !_FS_READONLY
|
|
FRESULT reserve_direntry (DIR *dj, UINT8 **dir)
|
|
{
|
|
UINT32 clust;
|
|
UINT32 sector;
|
|
UINT8 c;
|
|
UINT8 n;
|
|
UINT8 *dptr;
|
|
FATFS *fs = dj->fs;
|
|
|
|
/* Re-initialize directory object */
|
|
clust = dj->sclust;
|
|
if (clust != 0)
|
|
{
|
|
/* Dyanmic directory table */
|
|
dj->clust = clust;
|
|
dj->sect = clust2sect(fs, clust);
|
|
}
|
|
else
|
|
{
|
|
/* Static directory table */
|
|
dj->sect = fs->dirbase;
|
|
}
|
|
dj->index = 0;
|
|
|
|
do
|
|
{
|
|
if (!move_window(fs, dj->sect))
|
|
{
|
|
return FR_RW_ERROR;
|
|
}
|
|
/* Pointer to the directory entry */
|
|
dptr = &fs->win[(dj->index & ((SS(dj->fs) - 1) / 32)) * 32];
|
|
c = dptr[DIR_Name];
|
|
if (c == 0 || c == 0xE5)
|
|
{
|
|
/* Found an empty entry */
|
|
*dir = dptr;
|
|
return FR_OK;
|
|
}
|
|
} while (next_dir_entry(dj)); /* Next directory pointer */
|
|
/* Reached to end of the directory table */
|
|
|
|
/* Abort when it is a static table or could not stretch dynamic table */
|
|
if (clust == 0 || !(clust = create_chain(fs, dj->clust)))
|
|
{
|
|
return FR_DENIED;
|
|
}
|
|
if (clust == 1 || !move_window(fs, 0))
|
|
{
|
|
return FR_RW_ERROR;
|
|
}
|
|
|
|
/* Cleanup the expanded table */
|
|
fs->winsect = sector = clust2sect(fs, clust);
|
|
memset(fs->win, 0, SS(fs));
|
|
for (n = fs->csize; n; n--)
|
|
{
|
|
if (disk_write(fs->drive, fs->win, sector, 1) != RES_OK)
|
|
{
|
|
return FR_RW_ERROR;
|
|
}
|
|
sector++;
|
|
}
|
|
fs->winflag = 1;
|
|
*dir = fs->win;
|
|
|
|
return FR_OK;
|
|
}
|
|
#endif
|
|
|
|
|
|
UINT8 check_fs (FATFS *fs, UINT32 sect)
|
|
{
|
|
|
|
/* Load boot record */
|
|
if (disk_read(fs->drive, fs->win, sect, 1) != RES_OK)
|
|
{
|
|
return 2;
|
|
}
|
|
/* Check record signature (always placed at offset 510 even if the sector
|
|
* size is >512)
|
|
*/
|
|
if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)
|
|
{
|
|
return 2;
|
|
}
|
|
|
|
/* Check FAT signature */
|
|
if (!memcmp(&fs->win[BS_FilSysType], "FAT", 3))
|
|
{
|
|
return 0;
|
|
}
|
|
if (!memcmp(&fs->win[BS_FilSysType32], "FAT32", 5)
|
|
&& !(fs->win[BPB_ExtFlags] & 0x80))
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
FRESULT auto_mount (const char **path, FATFS **rfs, UINT8 chk_wp)
|
|
{
|
|
UINT32 bootsect;
|
|
UINT32 fatsize;
|
|
UINT32 totalsect;
|
|
UINT32 maxclust;
|
|
UINT8 drv;
|
|
UINT8 fmt;
|
|
UINT8 *tbl;
|
|
DSTATUS stat;
|
|
|
|
const char *p = *path;
|
|
FATFS *fs;
|
|
|
|
/* Get drive number from the path name */
|
|
while (*p == ' ')
|
|
{
|
|
p++; /* Strip leading spaces */
|
|
}
|
|
drv = p[0] - '0'; /* Is there a drive number? */
|
|
if (drv <= 9 && p[1] == ':')
|
|
{
|
|
p += 2; /* Found drive number, get&strip it */
|
|
}
|
|
else
|
|
{
|
|
drv = 0; /* No drive number is given, use */
|
|
/* drive number 0 as default */
|
|
}
|
|
if (*p == '/')
|
|
{
|
|
p++; /* Strip heading slash */
|
|
}
|
|
*path = p; /* Return pointer to the path name */
|
|
|
|
/* Check if the drive number is valid or not */
|
|
if (drv >= _DRIVES)
|
|
{
|
|
return FR_INVALID_DRIVE; /* Is the drive number valid? */
|
|
}
|
|
*rfs = fs = FatFs[drv]; /* Returen pointer to the */
|
|
/* corresponding file system object */
|
|
if (!fs)
|
|
{
|
|
return FR_NOT_ENABLED; /* Is file system object registered?*/
|
|
}
|
|
|
|
if (fs->fs_type)
|
|
{
|
|
/* If the logical drive has been mounted */
|
|
stat = disk_status(fs->drive);
|
|
if (!(stat & STA_NOINIT))
|
|
{
|
|
/* and physical drive is kept initialized (has not been changed)*/
|
|
#if !_FS_READONLY
|
|
/* Check write protection if needed */
|
|
if (chk_wp && (stat & STA_PROTECT))
|
|
{
|
|
return FR_WRITE_PROTECTED;
|
|
}
|
|
#endif
|
|
return FR_OK; /* The file system object is valid */
|
|
}
|
|
}
|
|
|
|
/* The logical drive must be re-mounted.
|
|
* Following code attempts to mount the logical drive
|
|
*/
|
|
|
|
memset(fs, 0, sizeof(FATFS)); /* Clean-up the file system object */
|
|
fs->drive = LD2PD(drv); /* Bind logical and physical drive */
|
|
stat = disk_initialize(fs->drive); /* Initialize low level I/O layer */
|
|
|
|
if (stat & STA_NOINIT) /* Check if the drive is ready */
|
|
{
|
|
return FR_NOT_READY;
|
|
}
|
|
#if S_MAX_SIZ > 512 /* Get disk sector size if needed */
|
|
if (disk_ioctl(drv,GET_SECTOR_SIZE,&SS(fs)) != RES_OK || SS(fs)> S_MAX_SIZ)
|
|
{
|
|
return FR_NO_FILESYSTEM;
|
|
}
|
|
#endif
|
|
#if !_FS_READONLY
|
|
if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
|
|
{
|
|
return FR_WRITE_PROTECTED;
|
|
}
|
|
#endif
|
|
/* Search FAT partition on the drive */
|
|
fmt = check_fs(fs, bootsect = 0); /* Check sector 0 as an SFD format */
|
|
if (fmt == 1)
|
|
{
|
|
/* Not an FAT boot record, it may be patitioned */
|
|
/* Check a partition listed in top of the partition table */
|
|
tbl = &fs->win[MBR_Table + LD2PT(drv) * 16]; /* Partition table */
|
|
if (tbl[4])
|
|
{
|
|
/* Is the partition existing? */
|
|
bootsect = LD_DWORD(&tbl[8]); /* Partition offset in LBA */
|
|
fmt = check_fs(fs, bootsect); /* Check the partition */
|
|
}
|
|
}
|
|
/* No valid FAT patition is found */
|
|
if (fmt || LD_WORD(&fs->win[BPB_BytsPerSec]) != SS(fs))
|
|
{
|
|
return FR_NO_FILESYSTEM;
|
|
}
|
|
|
|
/* Initialize the file system object */
|
|
fatsize = LD_WORD(&fs->win[BPB_FATSz16]); /* Number of sectors per FAT */
|
|
if (!fatsize)
|
|
{
|
|
fatsize = LD_DWORD(&fs->win[BPB_FATSz32]);
|
|
}
|
|
fs->sects_fat = fatsize;
|
|
/* Number of FAT copies */
|
|
fs->n_fats = fs->win[BPB_NumFATs];
|
|
/* (Number of sectors in FAT area) */
|
|
fatsize *= fs->n_fats;
|
|
/* FAT start sector (lba) */
|
|
fs->fatbase = bootsect + LD_WORD(&fs->win[BPB_RsvdSecCnt]);
|
|
/* Number of sectors per cluster */
|
|
fs->csize = fs->win[BPB_SecPerClus];
|
|
/* Nmuber of root directory entries */
|
|
fs->n_rootdir = LD_WORD(&fs->win[BPB_RootEntCnt]);
|
|
/* Number of sectors on the file system */
|
|
totalsect = LD_WORD(&fs->win[BPB_TotSec16]);
|
|
if (!totalsect)
|
|
{
|
|
totalsect = LD_DWORD(&fs->win[BPB_TotSec32]);
|
|
}
|
|
|
|
/* max_clust = Last cluster# + 1 */
|
|
fs->max_clust = maxclust = (totalsect - LD_WORD(&fs->win[BPB_RsvdSecCnt])
|
|
- fatsize - fs->n_rootdir / (SS(fs)/32) ) / fs->csize + 2;
|
|
|
|
fmt = FS_FAT12; /* Determine the FAT sub type */
|
|
if (maxclust >= 0xFF7)
|
|
{
|
|
fmt = FS_FAT16;
|
|
}
|
|
if (maxclust >= 0xFFF7)
|
|
{
|
|
fmt = FS_FAT32;
|
|
}
|
|
|
|
if (fmt == FS_FAT32)
|
|
{
|
|
/* Root directory start cluster */
|
|
fs->dirbase = LD_DWORD(&fs->win[BPB_RootClus]);
|
|
}
|
|
else
|
|
{
|
|
/* Root directory start sector (lba) */
|
|
fs->dirbase = fs->fatbase + fatsize;
|
|
}
|
|
|
|
/* Data start sector (lba) */
|
|
fs->database = fs->fatbase + fatsize + fs->n_rootdir / (SS(fs)/32);
|
|
|
|
#if !_FS_READONLY
|
|
/* Initialize allocation information */
|
|
fs->free_clust = 0xFFFFFFFF;
|
|
#if _USE_FSINFO
|
|
/* Get fsinfo if needed */
|
|
if (fmt == FS_FAT32)
|
|
{
|
|
fs->fsi_sector = bootsect + LD_WORD(&fs->win[BPB_FSInfo]);
|
|
if (disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK &&
|
|
LD_WORD(&fs->win[BS_55AA]) == 0xAA55 &&
|
|
LD_DWORD(&fs->win[FSI_LeadSig]) == 0x41615252 &&
|
|
LD_DWORD(&fs->win[FSI_StrucSig]) == 0x61417272)
|
|
{
|
|
fs->last_clust = LD_DWORD(&fs->win[FSI_Nxt_Free]);
|
|
fs->free_clust = LD_DWORD(&fs->win[FSI_Free_Count]);
|
|
}
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
fs->fs_type = fmt; /* FAT syb-type */
|
|
fs->id = ++fsid; /* File system mount ID */
|
|
return FR_OK;
|
|
}
|
|
|
|
|
|
FRESULT validate (const FATFS *fs, UINT16 id)
|
|
{
|
|
if (!fs || !fs->fs_type || fs->id != id)
|
|
{
|
|
return FR_INVALID_OBJECT;
|
|
}
|
|
|
|
if (disk_status(fs->drive) & STA_NOINIT)
|
|
{
|
|
return FR_NOT_READY;
|
|
}
|
|
|
|
return FR_OK;
|
|
}
|