ff.c

STM32读取SD卡上FAT12_16_32文件系统源代码

/*----------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.06                     (C)ChaN, 2008
/-----------------------------------------------------------------------------/
/ The FatFs module is an experimenal project to implement FAT file system to
/ cheap microcontrollers. This is a free software and is opened for education,
/ research and development under license policy of following trems.
/
/  Copyright (C) 2008, ChaN, all right reserved.
/
/ * The FatFs module is a free software and there is no warranty.
/ * You can use, modify and/or redistribute it for personal, non-profit or
/   commercial use without restriction under your responsibility.
/ * Redistributions of source code must retain the above copyright notice.
/
/-----------------------------------------------------------------------------/
/ Feb 26,'06 R0.00  Prototype.
/
/ Apr 29,'06 R0.01  First stable version.
/
/ Jun 01,'06 R0.02  Added FAT12 support.
/                   Removed unbuffered mode.
/                   Fixed a problem on small (<32M) patition.
/ Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
/
/ Sep 22,'06 R0.03  Added f_rename().
/                   Changed option _FS_MINIMUM to _FS_MINIMIZE.
/ Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast.
/                   Fixed f_mkdir() creates incorrect directory on FAT32.
/
/ Feb 04,'07 R0.04  Supported multiple drive system.
/                   Changed some interfaces for multiple drive system.
/                   Changed f_mountdrv() to f_mount().
/                   Added f_mkfs().
/ Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive.
/                   Added a capability of extending file size to f_lseek().
/                   Added minimization level 3.
/                   Fixed an endian sensitive code in f_mkfs().
/ May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
/                   Added FSInfo support.
/                   Fixed DBCS name can result FR_INVALID_NAME.
/                   Fixed short seek (<= csize) collapses the file object.
/
/ Aug 25,'07 R0.05  Changed arguments of f_read(), f_write() and f_mkfs().
/                   Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
/                   Fixed f_mkdir() on FAT32 creates incorrect directory.
/ Feb 03,'08 R0.05a Added f_truncate() and f_utime().
/                   Fixed off by one error at FAT sub-type determination.
/                   Fixed btr in f_read() can be mistruncated.
/                   Fixed cached sector is not flushed when create and close
/                   without write.
/
/ Apr 01,'08 R0.06  Added fputc(), fputs(), fprintf() and fgets().
/                   Improved performance of f_lseek() on moving to the same
/                   or following cluster.
/---------------------------------------------------------------------------*/

#include <string.h>
#include "ff.h"			/* FatFs declarations */
#include "diskio.h"		/* Include file for user provided disk functions */

/*--------------------------------------------------------------------------

   Module Private Functions

---------------------------------------------------------------------------*/

static
FATFS *FatFs[_DRIVES];	/* Pointer to the file system objects (logical drives) */
static
WORD fsid;				/* File system mount ID */



/*-----------------------------------------------------------------------*/
/* Change window offset                                                  */
/*-----------------------------------------------------------------------*/

static
BOOL move_window (	/* TRUE: successful, FALSE: failed */
	FATFS *fs,		/* File system object */
	DWORD sector	/* Sector number to make apperance in the fs->win[] */
)					/* Move to zero only writes back dirty window */
{
	DWORD wsect;


	wsect = fs->winsect;
	if (wsect != sector) {	/* Changed current window */
#if !_FS_READONLY
		BYTE n;
		if (fs->winflag) {	/* Write back dirty window if needed */
			if (disk_write(fs->drive, fs->win, wsect, 1) != RES_OK)
				return FALSE;
			fs->winflag = 0;
			if (wsect < (fs->fatbase + fs->sects_fat)) {	/* In FAT area */
				for (n = fs->n_fats; n >= 2; n--) {	/* Refrect the change to FAT copy */
					wsect += fs->sects_fat;
					disk_write(fs->drive, fs->win, wsect, 1);
				}
			}
		}
#endif
		if (sector) {
			if (disk_read(fs->drive, fs->win, sector, 1) != RES_OK)
				return FALSE;
			fs->winsect = sector;
		}
	}
	return TRUE;
}




/*-----------------------------------------------------------------------*/
/* Clean-up cached data                                                  */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
FRESULT sync (	/* FR_OK: successful, FR_RW_ERROR: failed */
	FATFS *fs	/* File system object */
)
{
	fs->winflag = 1;
	if (!move_window(fs, 0)) return FR_RW_ERROR;
#if _USE_FSINFO
	/* Update FSInfo sector if needed */
	if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {
		fs->winsect = 0;
		memset(fs->win, 0, 512);
		ST_WORD(&fs->win[BS_55AA], 0xAA55);
		ST_DWORD(&fs->win[FSI_LeadSig], 0x41615252);
		ST_DWORD(&fs->win[FSI_StrucSig], 0x61417272);
		ST_DWORD(&fs->win[FSI_Free_Count], fs->free_clust);
		ST_DWORD(&fs->win[FSI_Nxt_Free], fs->last_clust);
		disk_write(fs->drive, fs->win, fs->fsi_sector, 1);
		fs->fsi_flag = 0;
	}
#endif
	/* Make sure that no pending write process in the physical drive */
	if (disk_ioctl(fs->drive, CTRL_SYNC, NULL) != RES_OK)
		return FR_RW_ERROR;
	return FR_OK;
}
#endif




/*-----------------------------------------------------------------------*/
/* Get a cluster status                                                  */
/*-----------------------------------------------------------------------*/

static
DWORD get_cluster (	/* 0,>=2: successful, 1: failed */
	FATFS *fs,		/* File system object */
	DWORD clust		/* Cluster# to get the link information */
)
{
	WORD wc, bc;
	DWORD fatsect;


	if (clust >= 2 && clust < fs->max_clust) {		/* Is it a valid cluster#? */
		fatsect = fs->fatbase;
		switch (fs->fs_type) {
		case FS_FAT12 :
			bc = (WORD)clust * 3 / 2;
			if (!move_window(fs, fatsect + (bc / SS(fs)))) break;
			wc = fs->win[bc & (SS(fs) - 1)]; bc++;
			if (!move_window(fs, fatsect + (bc / SS(fs)))) break;
			wc |= (WORD)fs->win[bc & (SS(fs) - 1)] << 8;
			return (clust & 1) ? (wc >> 4) : (wc & 0xFFF);

		case FS_FAT16 :
			if (!move_window(fs, fatsect + (clust / (SS(fs) / 2)))) break;
			return LD_WORD(&fs->win[((WORD)clust * 2) & (SS(fs) - 1)]);

		case FS_FAT32 :
			if (!move_window(fs, fatsect + (clust / (SS(fs) / 4)))) break;
			return LD_DWORD(&fs->win[((WORD)clust * 4) & (SS(fs) - 1)]) & 0x0FFFFFFF;
		}
	}

	return 1;	/* Out of cluster range, or an error occured */
}




/*-----------------------------------------------------------------------*/
/* Change a cluster status                                               */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
BOOL put_cluster (	/* TRUE: successful, FALSE: failed */
	FATFS *fs,		/* File system object */
	DWORD clust,	/* Cluster# to change (must be 2 to fs->max_clust-1) */
	DWORD val		/* New value to mark the cluster */
)
{
	WORD bc;
	BYTE *p;
	DWORD fatsect;


	fatsect = fs->fatbase;
	switch (fs->fs_type) {
	case FS_FAT12 :
		bc = (WORD)clust * 3 / 2;
		if (!move_window(fs, fatsect + (bc / SS(fs)))) return FALSE;
		p = &fs->win[bc & (SS(fs) - 1)];
		*p = (clust & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
		bc++;
		fs->winflag = 1;
		if (!move_window(fs, fatsect + (bc / SS(fs)))) return FALSE;
		p = &fs->win[bc & (SS(fs) - 1)];
		*p = (clust & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
		break;

	case FS_FAT16 :
		if (!move_window(fs, fatsect + (clust / (SS(fs) / 2)))) return FALSE;
		ST_WORD(&fs->win[((WORD)clust * 2) & (SS(fs) - 1)], (WORD)val);
		break;

	case FS_FAT32 :
		if (!move_window(fs, fatsect + (clust / (SS(fs) / 4)))) return FALSE;
		ST_DWORD(&fs->win[((WORD)clust * 4) & (SS(fs) - 1)], val);
		break;

	default :
		return FALSE;
	}
	fs->winflag = 1;
	return TRUE;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Remove a cluster chain                                                */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
BOOL remove_chain (	/* TRUE: successful, FALSE: failed */
	FATFS *fs,		/* File system object */
	DWORD clust		/* Cluster# to remove chain from */
)
{
	DWORD nxt;


	while (clust >= 2 && clust < fs->max_clust) {
		nxt = get_cluster(fs, clust);
		if (nxt == 1) return FALSE;
		if (!put_cluster(fs, clust, 0)) return FALSE;
		if (fs->free_clust != 0xFFFFFFFF) {
			fs->free_clust++;
#if _USE_FSINFO
			fs->fsi_flag = 1;
#endif
		}
		clust = nxt;
	}
	return TRUE;
}
#endif




/*-----------------------------------------------------------------------*/
/* Stretch or create a cluster chain                                     */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
DWORD create_chain (	/* 0: No free cluster, 1: Error, >=2: New cluster number */
	FATFS *fs,			/* File system object */
	DWORD clust			/* Cluster# to stretch, 0 means create new */
)
{
	DWORD cstat, ncl, scl, mcl = fs->max_clust;


	if (clust == 0) {		/* Create new chain */
		scl = fs->last_clust;			/* Get suggested start point */
		if (scl == 0 || scl >= mcl) scl = 1;
	}
	else {					/* Stretch existing chain */
		cstat = get_cluster(fs, clust);	/* Check the cluster status */
		if (cstat < 2) return 1;		/* It is an invalid cluster */
		if (cstat < mcl) return cstat;	/* It is already followed by next cluster */
		scl = clust;
	}

	ncl = scl;				/* Start cluster */
	for (;;) {
		ncl++;							/* Next cluster */
		if (ncl >= mcl) {				/* Wrap around */
			ncl = 2;
			if (ncl > scl) return 0;	/* No free custer */
		}
		cstat = get_cluster(fs, ncl);	/* Get the cluster status */
		if (cstat == 0) break;			/* Found a free cluster */
		if (cstat == 1) return 1;		/* Any error occured */
		if (ncl == scl) return 0;		/* No free custer */
	}

	if (!put_cluster(fs, ncl, 0x0FFFFFFF)) return 1;			/* Mark the new cluster "in use" */
	if (clust != 0 && !put_cluster(fs, clust, ncl)) return 1;	/* Link it to previous one if needed */

	fs->last_clust = ncl;				/* Update fsinfo */
	if (fs->free_clust != 0xFFFFFFFF) {
		fs->free_clust--;
#if _USE_FSINFO
		fs->fsi_flag = 1;
#endif
	}

	return ncl;		/* Return new cluster number */
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/

static
DWORD clust2sect (	/* !=0: sector number, 0: failed - invalid cluster# */
	FATFS *fs,		/* File system object */
	DWORD clust		/* Cluster# to be converted */
)
{
	clust -= 2;
	if (clust >= (fs->max_clust - 2)) return 0;		/* Invalid cluster# */
	return clust * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* Move directory pointer to next                                        */
/*-----------------------------------------------------------------------*/

static
BOOL next_dir_entry (	/* TRUE: successful, FALSE: could not move next */
	DIR *dj				/* Pointer to directory object */
)
{
	DWORD clust;
	WORD idx;


	idx = dj->index + 1;
	if ((idx & ((SS(dj->fs) - 1) / 32)) == 0) {		/* Table sector changed? */
		dj->sect++;				/* Next sector */
		if (dj->clust == 0) {	/* In static table */
			if (idx >= dj->fs->n_rootdir) return FALSE;	/* Reached to end of table */
		} else {					/* In dynamic table */
			if (((idx / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0) {	/* Cluster changed? */
				clust = get_cluster(dj->fs, dj->clust);			/* Get next cluster */
				if (clust < 2 || clust >= dj->fs->max_clust)	/* Reached to end of table */
					return FALSE;
				dj->clust = clust;				/* Initialize for new cluster */
				dj->sect = clust2sect(dj->fs, clust);
			}
		}
	}
	dj->index = idx;	/* Lower several bits of dj->index indicates offset in dj->sect */
	return TRUE;
}




/*-----------------------------------------------------------------------*/
/* Get file status from directory entry                                  */
/*-----------------------------------------------------------------------*/

#if _FS_MINIMIZE <= 1
static
void get_fileinfo (	/* No return code */
	FILINFO *finfo, /* Ptr to store the file information */
	const BYTE *dir	/* Ptr to the directory entry */
)
{