ebox学习之SD & fat 配置

fatfs可配置项很多，相关的配置均在ffconfig.h文件中

/*---------------------------------------------------------------------------/
/ Function Configurations 功能配置
/---------------------------------------------------------------------------*/

#define _FS_READONLY	0  //是否只读，只读模式下所有和写操作相关的api均被移除
/* This option switches read-only configuration. (0:Read/Write or 1:Read-only)
/  Read-only configuration removes writing API functions, f_write(), f_sync(),
/  f_unlink(), f_mkdir(), f_chmod(), f_rename(), f_truncate(), f_getfree()
/  and optional writing functions as well. */


#define _FS_MINIMIZE	0 //通过移除基本API来裁剪代码，使代码最小
/* This option defines minimization level to remove some basic API functions.
/
/   0: All basic functions are enabled. 所有基本功能有效
/   1: f_stat(), f_getfree(), f_unlink(), f_mkdir(), f_chmod(), f_utime(),
/      f_truncate() and f_rename() function are removed. 
/   2: f_opendir(), f_readdir() and f_closedir() are removed in addition to 1.
/      在1的基础上移除目录相关函数
/   3: f_lseek() function is removed in addition to 2. 在2的基础上移除f_lseek函数 */


#define	_USE_STRFUNC	0 // 是否使能字符串函数
/* This option switches string functions, f_gets(), f_putc(), f_puts() and
/  f_printf().
/
/  0: Disable string functions.
/  1: Enable without LF-CRLF conversion. 使能字符串函数，但不包括LF-CRLF（不同系统下的换行）转换
/  2: Enable with LF-CRLF conversion. */


#define _USE_FIND		0  // 配置文件夹查找过滤及相关函数
/* This option switches filtered directory read feature and related functions,
/  f_findfirst() and f_findnext(). (0:Disable or 1:Enable) */

#define	_USE_MKFS		0  

/* This option switches f_mkfs() function. (0:Disable or 1:Enable) */


#define	_USE_FASTSEEK	0 // 快速查找
/* This option switches fast seek feature. (0:Disable or 1:Enable) */


#define _USE_LABEL		0 // 磁盘卷标
/* This option switches volume label functions, f_getlabel() and f_setlabel().
/  (0:Disable or 1:Enable) */


#define	_USE_FORWARD	0 // 数据流转法
/* This option switches f_forward() function. (0:Disable or 1:Enable)
/  To enable it, also _FS_TINY need to be set to 1. */


/*---------------------------------------------------------------------------/
/ Locale and Namespace Configurations // 地区和命名空间配置
/---------------------------------------------------------------------------*/

#define _CODE_PAGE	932  // 配置目标系统OEM code
/* This option specifies the OEM code page to be used on the target system.
/  Incorrect setting of the code page can cause a file open failure.
/  错误的配置会导致文件打开失败
/   1   - ASCII (No extended character. Non-LFN cfg. only)
/   437 - U.S.
/   720 - Arabic
/   737 - Greek
/   771 - KBL
/   775 - Baltic
/   850 - Latin 1
/   852 - Latin 2
/   855 - Cyrillic
/   857 - Turkish
/   860 - Portuguese
/   861 - Icelandic
/   862 - Hebrew
/   863 - Canadian French
/   864 - Arabic
/   865 - Nordic
/   866 - Russian
/   869 - Greek 2
/   932 - Japanese (DBCS)
/   936 - Simplified Chinese (DBCS)
/   949 - Korean (DBCS)
/   950 - Traditional Chinese (DBCS)
*/


#define	_USE_LFN	0    // 长文件名
#define	_MAX_LFN	255  // LFN缓冲区，LFN禁止时无效
/* The _USE_LFN option switches the LFN feature.
/
/   0: Disable LFN feature. _MAX_LFN has no effect.
/   1: Enable LFN with static working buffer on the BSS. Always NOT thread-safe. 
/      启用LFN,并使用BSS上的静态缓冲区
/   2: Enable LFN with dynamic working buffer on the STACK. 使用堆上的动态缓冲区
/   3: Enable LFN with dynamic working buffer on the HEAP.
/
/  When enable the LFN feature, Unicode handling functions (option/unicode.c) must
/  如果使用LFN功能，optin/unicode.c必须添加到工程里，
/  be added to the project. The LFN working buffer occupies (_MAX_LFN + 1) * 2 bytes.
/  When use stack for the working buffer, take care on stack overflow. When use heap
/  memory for the working buffer, memory management functions, ff_memalloc() and
/  ff_memfree(), must be added to the project. */


#define	_LFN_UNICODE	0 // 编码类型
/* This option switches character encoding on the API. (0:ANSI/OEM or 1:Unicode)
/  To use Unicode string for the path name, enable LFN feature and set _LFN_UNICODE
/  to 1. This option also affects behavior of string I/O functions. */


#define _STRF_ENCODE	// 字符串I/O功能编码，仅在_LFN_UNICODE为1时有效
/* When _LFN_UNICODE is 1, this option selects the character encoding on the file to
/  be read/written via string I/O functions, f_gets(), f_putc(), f_puts and f_printf().
/
/  0: ANSI/OEM
/  1: UTF-16LE
/  2: UTF-16BE
/  3: UTF-8
/
/  When _LFN_UNICODE is 0, this option has no effect. */


#define _FS_RPATH	0 // 相对路径
/* This option configures relative path feature.
/
/   0: Disable relative path feature and remove related functions.
/   1: Enable relative path feature. f_chdir() and f_chdrive() are available.
/   2: f_getcwd() function is available in addition to 1.
/
/  Note that directory items read via f_readdir() are affected by this option. */


/*---------------------------------------------------------------------------/
/ Drive/Volume Configurations // 驱动器/卷标配置
/---------------------------------------------------------------------------*/

#define _VOLUMES	1
/* Number of volumes (logical drives) to be used. */


#define _STR_VOLUME_ID	0
#define _VOLUME_STRS	"RAM","NAND","CF","SD1","SD2","USB1","USB2","USB3"
/* _STR_VOLUME_ID option switches string volume ID feature.
/  When _STR_VOLUME_ID is set to 1, also pre-defined strings can be used as drive
/  number in the path name. _VOLUME_STRS defines the drive ID strings for each
/  logical drives. Number of items must be equal to _VOLUMES. Valid characters for
/  the drive ID strings are: A-Z and 0-9. */


#define	_MULTI_PARTITION	0 // 多分区
/* This option switches multi-partition feature. By default (0), each logical drive
/  number is bound to the same physical drive number and only an FAT volume found on
/  the physical drive will be mounted. When multi-partition feature is enabled (1),
/  each logical drive number is bound to arbitrary physical drive and partition
/  listed in the VolToPart[]. Also f_fdisk() funciton will be available. */


#define	_MIN_SS		512  // 配置支持的扇区大小，硬盘和SD卡多为512.flash 和 光盘可能需要更大的
#define	_MAX_SS		512
/* These options configure the range of sector size to be supported. (512, 1024,
/  2048 or 4096) Always set both 512 for most systems, all type of memory cards and
/  harddisk. But a larger value may be required for on-board flash memory and some
/  type of optical media. When _MAX_SS is larger than _MIN_SS, FatFs is configured
/  to variable sector size and GET_SECTOR_SIZE command must be implemented to the
/  disk_ioctl() function. */


#define	_USE_TRIM	0
/* This option switches ATA-TRIM feature. (0:Disable or 1:Enable)
/  To enable Trim feature, also CTRL_TRIM command should be implemented to the
/  disk_ioctl() function. */


#define _FS_NOFSINFO	0 // 精确地剩余空间
/* If you need to know correct free space on the FAT32 volume, set bit 0 of this
/  option, and f_getfree() function at first time after volume mount will force
/  a full FAT scan. Bit 1 controls the use of last allocated cluster number.
/
/  bit0=0: Use free cluster count in the FSINFO if available.
/  bit0=1: Do not trust free cluster count in the FSINFO.
/  bit1=0: Use last allocated cluster number in the FSINFO if available.
/  bit1=1: Do not trust last allocated cluster number in the FSINFO.
*/



/*---------------------------------------------------------------------------/
/ System Configurations 系统配置
/---------------------------------------------------------------------------*/

#define	_FS_TINY	0 // 最小缓冲区
/* This option switches tiny buffer configuration. (0:Normal or 1:Tiny)
/  At the tiny configuration, size of the file object (FIL) is reduced _MAX_SS
/  bytes. Instead of private sector buffer eliminated from the file object,
/  common sector buffer in the file system object (FATFS) is used for the file
/  data transfer. */


#define _FS_NORTC	0  // 是否使用时间戳 0-使用，1-禁止
#define _NORTC_MON	1  // 禁用时间戳是使用预设的时间戳
#define _NORTC_MDAY	1
#define _NORTC_YEAR	2015
/* The _FS_NORTC option switches timestamp feature. If the system does not have
/  an RTC function or valid timestamp is not needed, set _FS_NORTC to 1 to disable
/  the timestamp feature. All objects modified by FatFs will have a fixed timestamp
/  defined by _NORTC_MON, _NORTC_MDAY and _NORTC_YEAR.
/  When timestamp feature is enabled (_FS_NORTC == 0), get_fattime() function need
/  to be added to the project to read current time form RTC. _NORTC_MON,
/  _NORTC_MDAY and _NORTC_YEAR have no effect.  文件系统配置为只读时无效
/  These options have no effect at read-only configuration (_FS_READONLY == 1). */


#define	_FS_LOCK	0
/* The _FS_LOCK option switches file lock feature to control duplicated file open
/  and illegal operation to open objects. This option must be 0 when _FS_READONLY
/  is 1.
/
/  0:  Disable file lock feature. To avoid volume corruption, application program
/      should avoid illegal open, remove and rename to the open objects.
/  >0: Enable file lock feature. The value defines how many files/sub-directories
/      can be opened simultaneously under file lock control. Note that the file
/      lock feature is independent of re-entrancy. */


#define _FS_REENTRANT	0
#define _FS_TIMEOUT		1000
#define	_SYNC_t			HANDLE
/* The _FS_REENTRANT option switches the re-entrancy (thread safe) of the FatFs
/  module itself. Note that regardless of this option, file access to different
/  volume is always re-entrant and volume control functions, f_mount(), f_mkfs()
/  and f_fdisk() function, are always not re-entrant. Only file/directory access
/  to the same volume is under control of this feature.
/
/   0: Disable re-entrancy. _FS_TIMEOUT and _SYNC_t have no effect.
/   1: Enable re-entrancy. Also user provided synchronization handlers,
/      ff_req_grant(), ff_rel_grant(), ff_del_syncobj() and ff_cre_syncobj()
/      function, must be added to the project. Samples are available in
/      option/syscall.c.
/
/  The _FS_TIMEOUT defines timeout period in unit of time tick.
/  The _SYNC_t defines O/S dependent sync object type. e.g. HANDLE, ID, OS_EVENT*,
/  SemaphoreHandle_t and etc.. A header file for O/S definitions needs to be
/  included somewhere in the scope of ff.c. */


#define _WORD_ACCESS	0 // 默认，一般不需要改
/* The _WORD_ACCESS option is an only platform dependent option. It defines
/  which access method is used to the word data on the FAT volume.
/   Byte-By-Byte模式，可以用在所有平台   
/   0: Byte-by-byte access. Always compatible with all platforms.
/   1: Word access. Do not choose this unless under both the following conditions.
/
/  * Address misaligned memory access is always allowed to ALL instructions.
/  * Byte order on the memory is little-endian.
/
/  If it is the case, _WORD_ACCESS can also be set to 1 to reduce code size.
/  Following table shows allowable settings of some type of processors.
/
/  ARM7TDMI   0   *2          ColdFire   0    *1         V850E      0    *2
/  Cortex-M3  0   *3          Z80        0/1             V850ES     0/1
/  Cortex-M0  0   *2          x86        0/1             TLCS-870   0/1
/  AVR        0/1             RX600(LE)  0/1             TLCS-900   0/1
/  AVR32      0   *1          RL78       0    *2         R32C       0    *2
/  PIC18      0/1             SH-2       0    *1         M16C       0/1
/  PIC24      0   *2          H8S        0    *1         MSP430     0    *2
/  PIC32      0   *1          H8/300H    0    *1         8051       0/1
/
/  *1:Big-endian. 大端模式
/  *2:Unaligned memory access is not supported. 不支持非对齐访问
/  *3:Some compilers generate LDM/STM for mem_cpy function. 某些编译器生成LDM/STM内存拷贝功能
*/

一般情况下，我们只要配置下面几项即可：

1  #define _FS_READONLY 如果不写入数据可以配置为只读

2 #define _USE_FIND 文件查找过滤

3 #define _CODE_PAGE 编码格式

4 #define _FS_NORTC 时间戳

5 #define _FS_RPATH 是否使用相对路径

6 #define _USE_LFN 0 是否使用长文件名

来自为知笔记(Wiz)