littlefs.h

Go to the documentation of this file.

/*
 * Copyright (c) 2019 Bolt Innovation Management, LLC
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_FS_LITTLEFS_H_
#define ZEPHYR_INCLUDE_FS_LITTLEFS_H_
 
#include <zephyr/types.h>
#include <zephyr/kernel.h>
#include <zephyr/storage/flash_map.h>
 
#include <lfs.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
struct fs_littlefs {
        /* Defaulted in driver, customizable before mount. */
        struct lfs_config cfg;
 
        /* Must be cfg.cache_size */
        uint8_t *read_buffer;
 
        /* Must be cfg.cache_size */
        uint8_t *prog_buffer;
 
        /* Must be cfg.lookahead_size/4 elements, and
         * cfg.lookahead_size must be a multiple of 8.
         */
        uint32_t *lookahead_buffer[CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE / sizeof(uint32_t)];
 
        /* These structures are filled automatically at mount. */
        struct lfs lfs;
        void *backend;
        struct k_mutex mutex;
};
 
#define FS_LITTLEFS_DECLARE_CUSTOM_CONFIG(name, read_sz, prog_sz, cache_sz, lookahead_sz) \
        static uint8_t __aligned(4) name ## _read_buffer[cache_sz];                       \
        static uint8_t __aligned(4) name ## _prog_buffer[cache_sz];                       \
        static uint32_t name ## _lookahead_buffer[(lookahead_sz) / sizeof(uint32_t)];             \
        static struct fs_littlefs name = {                                                \
                .cfg = {                                                                  \
                        .read_size = (read_sz),                                           \
                        .prog_size = (prog_sz),                                           \
                        .cache_size = (cache_sz),                                         \
                        .lookahead_size = (lookahead_sz),                                 \
                        .read_buffer = name ## _read_buffer,                              \
                        .prog_buffer = name ## _prog_buffer,                              \
                        .lookahead_buffer = name ## _lookahead_buffer,                    \
                },                                                                        \
        }
 
#define FS_LITTLEFS_DECLARE_DEFAULT_CONFIG(name)                         \
        FS_LITTLEFS_DECLARE_CUSTOM_CONFIG(name,                          \
                                          CONFIG_FS_LITTLEFS_READ_SIZE,  \
                                          CONFIG_FS_LITTLEFS_PROG_SIZE,  \
                                          CONFIG_FS_LITTLEFS_CACHE_SIZE, \
                                          CONFIG_FS_LITTLEFS_LOOKAHEAD_SIZE)
 
#ifdef __cplusplus
}
#endif
 
#endif /* ZEPHYR_INCLUDE_FS_LITTLEFS_H_ */