uffs_config.h

来自「一个NAND FLASH文件系统」· C头文件 代码 · 共 81 行

/** 
 * \file uffs_config.h
 * \brief basic configuration of uffs
 * \author Ricky Zheng
 */

#ifndef _UFFS_CONFIG_H_
#define _UFFS_CONFIG_H_

/** \def MAX_CACHED_BLOCK_INFO */
#define MAX_CACHED_BLOCK_INFO	10

/** 
 * \def MAX_PAGE_BUFFERS
 * \note the bigger value will bring better read/write performance.
 *       but few writing performance will be improved when this 
 *       value is become larger than 'max pages per block'
 */
#define MAX_PAGE_BUFFERS		33

/**
 * \def MAX_DIRTY_PAGES_IN_A_BLOCK 
 * \note this value should be between '2' and 'max pages per block'.
 *       the smaller the value the frequently the buffer will be flushed.
 */
#define MAX_DIRTY_PAGES_IN_A_BLOCK 32


/** \def MAX_PATH_LENGTH */
#define MAX_PATH_LENGTH 128

/**
 * \def USE_NATIVE_MEMORY_ALLOCATOR
 * \note  the native memory allocator should only be used for
 *        tracking memory leak bugs or tracking memory consuming.
 *        In your final product, you either disable the native memory
 *        allocator or use the system heap as the memory pool for the
 *        native memory allocator.
 */
#define USE_NATIVE_MEMORY_ALLOCATOR


/** 
 * \def FLUSH_BUF_AFTER_WRITE
 * \note UFFS will write all data directly into flash in 
 *       each 'write' call if you enable this option.
 *       (which means lesser data lost when power failue but lower writing performance)
 *       we recomment not open this define for normal applications.
 */
//#define FLUSH_BUF_AFTER_WRITE

/**
 * \def TREE_NODE_USE_DOUBLE_LINK
 * \note: enable double link tree node will speed up insert/delete operation,
 */
#define TREE_NODE_USE_DOUBLE_LINK

/** 
 * \def MAX_OBJECT_HANDLE
 * maximum number of object handle 
 */
#define MAX_OBJECT_HANDLE	10

/**
 * \def MINIMUN_ERASED_BLOCK
 *  UFFS will not allow appending or creating new files when the erased block
 *  is lower then MINIMUN_ERASED_BLOCK.
 */
#define MINIMUN_ERASED_BLOCK 2

/**
 * \def CHANGE_MODIFY_TIME
 * If defined, closing a file which is opened for writing/appending will
 * update the file's modify time as well. Disable this feature will save a
 * lot of writing activities if you frequently open files for write and close it.
 */
#define CHANGE_MODIFY_TIME

#endif