ebox学习之SD & fat 配置

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fatfs可配置项很多，相关的配置均在ffconfig.h文件中
  1. /*---------------------------------------------------------------------------/
  2. / Function Configurations 功能配置
  3. /---------------------------------------------------------------------------*/
  5. #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
  6. /* This option switches read-only configuration. (0:Read/Write or 1:Read-only)
  7. /  Read-only configuration removes writing API functions, f_write(), f_sync(),
  8. /  f_unlink(), f_mkdir(), f_chmod(), f_rename(), f_truncate(), f_getfree()
  9. /  and optional writing functions as well. */
  12. #define _FS_MINIMIZE	0 //通过移除基本API来裁剪代码，使代码最小
  13. /* This option defines minimization level to remove some basic API functions.
  14. /
  15. /   0: All basic functions are enabled. 所有基本功能有效
  16. /   1: f_stat(), f_getfree(), f_unlink(), f_mkdir(), f_chmod(), f_utime(),
  17. /      f_truncate() and f_rename() function are removed. 
  18. /   2: f_opendir(), f_readdir() and f_closedir() are removed in addition to 1.
  19. /      在1的基础上移除目录相关函数
  20. /   3: f_lseek() function is removed in addition to 2. 在2的基础上移除f_lseek函数 */
  23. #define	_USE_STRFUNC	0 // 是否使能字符串函数
  24. /* This option switches string functions, f_gets(), f_putc(), f_puts() and
  25. /  f_printf().
  26. /
  27. /  0: Disable string functions.
  28. /  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
  29. /  2: Enable with LF-CRLF conversion. */
  32. #define _USE_FIND		0  // 配置文件夹查找过滤及相关函数
  33. /* This option switches filtered directory read feature and related functions,
  34. /  f_findfirst() and f_findnext(). (0:Disable or 1:Enable) */
  36. #define	_USE_MKFS		0  
  37. /* This option switches f_mkfs() function. (0:Disable or 1:Enable) */
  40. #define	_USE_FASTSEEK	0 // 快速查找
  41. /* This option switches fast seek feature. (0:Disable or 1:Enable) */
  44. #define _USE_LABEL		0 // 磁盘卷标
  45. /* This option switches volume label functions, f_getlabel() and f_setlabel().
  46. /  (0:Disable or 1:Enable) */
  49. #define	_USE_FORWARD	0 // 数据流转法
  50. /* This option switches f_forward() function. (0:Disable or 1:Enable)
  51. /  To enable it, also _FS_TINY need to be set to 1. */
  54. /*---------------------------------------------------------------------------/
  55. / Locale and Namespace Configurations // 地区和命名空间配置
  56. /---------------------------------------------------------------------------*/
  58. #define _CODE_PAGE	932  // 配置目标系统OEM code
  59. /* This option specifies the OEM code page to be used on the target system.
  60. /  Incorrect setting of the code page can cause a file open failure.
  61. /  错误的配置会导致文件打开失败
  62. /   1   - ASCII (No extended character. Non-LFN cfg. only)
  63. /   437 - U.S.
  64. /   720 - Arabic
  65. /   737 - Greek
  66. /   771 - KBL
  67. /   775 - Baltic
  68. /   850 - Latin 1
  69. /   852 - Latin 2
  70. /   855 - Cyrillic
  71. /   857 - Turkish
  72. /   860 - Portuguese
  73. /   861 - Icelandic
  74. /   862 - Hebrew
  75. /   863 - Canadian French
  76. /   864 - Arabic
  77. /   865 - Nordic
  78. /   866 - Russian
  79. /   869 - Greek 2
  80. /   932 - Japanese (DBCS)
  81. /   936 - Simplified Chinese (DBCS)
  82. /   949 - Korean (DBCS)
  83. /   950 - Traditional Chinese (DBCS)
  84. */
  87. #define	_USE_LFN	0    // 长文件名
  88. #define	_MAX_LFN	255  // LFN缓冲区，LFN禁止时无效
  89. /* The _USE_LFN option switches the LFN feature.
  90. /
  91. /   0: Disable LFN feature. _MAX_LFN has no effect.
  92. /   1: Enable LFN with static working buffer on the BSS. Always NOT thread-safe. 
  93. /      启用LFN,并使用BSS上的静态缓冲区
  94. /   2: Enable LFN with dynamic working buffer on the STACK. 使用堆上的动态缓冲区
  95. /   3: Enable LFN with dynamic working buffer on the HEAP.
  96. /
  97. /  When enable the LFN feature, Unicode handling functions (option/unicode.c) must
  98. /  如果使用LFN功能，optin/unicode.c必须添加到工程里，
  99. /  be added to the project. The LFN working buffer occupies (_MAX_LFN + 1) * 2 bytes.
  100. /  When use stack for the working buffer, take care on stack overflow. When use heap
  101. /  memory for the working buffer, memory management functions, ff_memalloc() and
  102. /  ff_memfree(), must be added to the project. */
  105. #define	_LFN_UNICODE	0 // 编码类型
  106. /* This option switches character encoding on the API. (0:ANSI/OEM or 1:Unicode)
  107. /  To use Unicode string for the path name, enable LFN feature and set _LFN_UNICODE
  108. /  to 1. This option also affects behavior of string I/O functions. */
  111. #define _STRF_ENCODE	// 字符串I/O功能编码，仅在_LFN_UNICODE为1时有效
  112. /* When _LFN_UNICODE is 1, this option selects the character encoding on the file to
  113. /  be read/written via string I/O functions, f_gets(), f_putc(), f_puts and f_printf().
  114. /
  115. /  0: ANSI/OEM
  116. /  1: UTF-16LE
  117. /  2: UTF-16BE
  118. /  3: UTF-8
  119. /
  120. /  When _LFN_UNICODE is 0, this option has no effect. */
  123. #define _FS_RPATH	0 // 相对路径
  124. /* This option configures relative path feature.
  125. /
  126. /   0: Disable relative path feature and remove related functions.
  127. /   1: Enable relative path feature. f_chdir() and f_chdrive() are available.
  128. /   2: f_getcwd() function is available in addition to 1.
  129. /
  130. /  Note that directory items read via f_readdir() are affected by this option. */
  133. /*---------------------------------------------------------------------------/
  134. / Drive/Volume Configurations // 驱动器/卷标配置
  135. /---------------------------------------------------------------------------*/
  137. #define _VOLUMES	1
  138. /* Number of volumes (logical drives) to be used. */
  141. #define _STR_VOLUME_ID	0
  142. #define _VOLUME_STRS	"RAM","NAND","CF","SD1","SD2","USB1","USB2","USB3"
  143. /* _STR_VOLUME_ID option switches string volume ID feature.
  144. /  When _STR_VOLUME_ID is set to 1, also pre-defined strings can be used as drive
  145. /  number in the path name. _VOLUME_STRS defines the drive ID strings for each
  146. /  logical drives. Number of items must be equal to _VOLUMES. Valid characters for
  147. /  the drive ID strings are: A-Z and 0-9. */
  150. #define	_MULTI_PARTITION	0 // 多分区
  151. /* This option switches multi-partition feature. By default (0), each logical drive
  152. /  number is bound to the same physical drive number and only an FAT volume found on
  153. /  the physical drive will be mounted. When multi-partition feature is enabled (1),
  154. /  each logical drive number is bound to arbitrary physical drive and partition
  155. /  listed in the VolToPart[]. Also f_fdisk() funciton will be available. */
  158. #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
  159. #define	_MAX_SS		512
  160. /* These options configure the range of sector size to be supported. (512, 1024,
  161. /  2048 or 4096) Always set both 512 for most systems, all type of memory cards and
  162. /  harddisk. But a larger value may be required for on-board flash memory and some
  163. /  type of optical media. When _MAX_SS is larger than _MIN_SS, FatFs is configured
  164. /  to variable sector size and GET_SECTOR_SIZE command must be implemented to the
  165. /  disk_ioctl() function. */
  168. #define	_USE_TRIM	0
  169. /* This option switches ATA-TRIM feature. (0:Disable or 1:Enable)
  170. /  To enable Trim feature, also CTRL_TRIM command should be implemented to the
  171. /  disk_ioctl() function. */
  174. #define _FS_NOFSINFO	0 // 精确地剩余空间
  175. /* If you need to know correct free space on the FAT32 volume, set bit 0 of this
  176. /  option, and f_getfree() function at first time after volume mount will force
  177. /  a full FAT scan. Bit 1 controls the use of last allocated cluster number.
  178. /
  179. /  bit0=0: Use free cluster count in the FSINFO if available.
  180. /  bit0=1: Do not trust free cluster count in the FSINFO.
  181. /  bit1=0: Use last allocated cluster number in the FSINFO if available.
  182. /  bit1=1: Do not trust last allocated cluster number in the FSINFO.
  183. */
  187. /*---------------------------------------------------------------------------/
  188. / System Configurations 系统配置
  189. /---------------------------------------------------------------------------*/
  191. #define	_FS_TINY	0 // 最小缓冲区
  192. /* This option switches tiny buffer configuration. (0:Normal or 1:Tiny)
  193. /  At the tiny configuration, size of the file object (FIL) is reduced _MAX_SS
  194. /  bytes. Instead of private sector buffer eliminated from the file object,
  195. /  common sector buffer in the file system object (FATFS) is used for the file
  196. /  data transfer. */
  199. #define _FS_NORTC	0  // 是否使用时间戳 0-使用，1-禁止
  200. #define _NORTC_MON	1  // 禁用时间戳是使用预设的时间戳
  201. #define _NORTC_MDAY	1
  202. #define _NORTC_YEAR	2015
  203. /* The _FS_NORTC option switches timestamp feature. If the system does not have
  204. /  an RTC function or valid timestamp is not needed, set _FS_NORTC to 1 to disable
  205. /  the timestamp feature. All objects modified by FatFs will have a fixed timestamp
  206. /  defined by _NORTC_MON, _NORTC_MDAY and _NORTC_YEAR.
  207. /  When timestamp feature is enabled (_FS_NORTC == 0), get_fattime() function need
  208. /  to be added to the project to read current time form RTC. _NORTC_MON,
  209. /  _NORTC_MDAY and _NORTC_YEAR have no effect.  文件系统配置为只读时无效
  210. /  These options have no effect at read-only configuration (_FS_READONLY == 1). */
  213. #define	_FS_LOCK	0
  214. /* The _FS_LOCK option switches file lock feature to control duplicated file open
  215. /  and illegal operation to open objects. This option must be 0 when _FS_READONLY
  216. /  is 1.
  217. /
  218. /  0:  Disable file lock feature. To avoid volume corruption, application program
  219. /      should avoid illegal open, remove and rename to the open objects.
  220. /  >0: Enable file lock feature. The value defines how many files/sub-directories
  221. /      can be opened simultaneously under file lock control. Note that the file
  222. /      lock feature is independent of re-entrancy. */
  225. #define _FS_REENTRANT	0
  226. #define _FS_TIMEOUT		1000
  227. #define	_SYNC_t			HANDLE
  228. /* The _FS_REENTRANT option switches the re-entrancy (thread safe) of the FatFs
  229. /  module itself. Note that regardless of this option, file access to different
  230. /  volume is always re-entrant and volume control functions, f_mount(), f_mkfs()
  231. /  and f_fdisk() function, are always not re-entrant. Only file/directory access
  232. /  to the same volume is under control of this feature.
  233. /
  234. /   0: Disable re-entrancy. _FS_TIMEOUT and _SYNC_t have no effect.
  235. /   1: Enable re-entrancy. Also user provided synchronization handlers,
  236. /      ff_req_grant(), ff_rel_grant(), ff_del_syncobj() and ff_cre_syncobj()
  237. /      function, must be added to the project. Samples are available in
  238. /      option/syscall.c.
  239. /
  240. /  The _FS_TIMEOUT defines timeout period in unit of time tick.
  241. /  The _SYNC_t defines O/S dependent sync object type. e.g. HANDLE, ID, OS_EVENT*,
  242. /  SemaphoreHandle_t and etc.. A header file for O/S definitions needs to be
  243. /  included somewhere in the scope of ff.c. */
  246. #define _WORD_ACCESS	0 // 默认，一般不需要改
  247. /* The _WORD_ACCESS option is an only platform dependent option. It defines
  248. /  which access method is used to the word data on the FAT volume.
  249. /   Byte-By-Byte模式，可以用在所有平台   
  250. /   0: Byte-by-byte access. Always compatible with all platforms.
  251. /   1: Word access. Do not choose this unless under both the following conditions.
  252. /
  253. /  * Address misaligned memory access is always allowed to ALL instructions.
  254. /  * Byte order on the memory is little-endian.
  255. /
  256. /  If it is the case, _WORD_ACCESS can also be set to 1 to reduce code size.
  257. /  Following table shows allowable settings of some type of processors.
  258. /
  259. /  ARM7TDMI   0   *2          ColdFire   0    *1         V850E      0    *2
  260. /  Cortex-M3  0   *3          Z80        0/1             V850ES     0/1
  261. /  Cortex-M0  0   *2          x86        0/1             TLCS-870   0/1
  262. /  AVR        0/1             RX600(LE)  0/1             TLCS-900   0/1
  263. /  AVR32      0   *1          RL78       0    *2         R32C       0    *2
  264. /  PIC18      0/1             SH-2       0    *1         M16C       0/1
  265. /  PIC24      0   *2          H8S        0    *1         MSP430     0    *2
  266. /  PIC32      0   *1          H8/300H    0    *1         8051       0/1
  267. /
  268. /  *1:Big-endian. 大端模式
  269. /  *2:Unaligned memory access is not supported. 不支持非对齐访问
  270. /  *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
  271. */
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




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