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https://github.com/eledio-devices/thirdparty-littlefs.git
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90 lines
2.0 KiB
C
90 lines
2.0 KiB
C
/*
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* Block device emulated on standard files
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*
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* Copyright (c) 2017 Christopher Haster
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* Distributed under the MIT license
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*/
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#ifndef LFS_EMUBD_H
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#define LFS_EMUBD_H
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#include "lfs_config.h"
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#include "lfs_util.h"
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#include "lfs_bd.h"
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// Config options
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#ifndef LFS_EMUBD_READ_SIZE
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#define LFS_EMUBD_READ_SIZE 1
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#endif
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#ifndef LFS_EMUBD_PROG_SIZE
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#define LFS_EMUBD_PROG_SIZE 1
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#endif
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#ifndef LFS_EMUBD_ERASE_SIZE
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#define LFS_EMUBD_ERASE_SIZE 512
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#endif
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#ifndef LFS_EMUBD_TOTAL_SIZE
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#define LFS_EMUBD_TOTAL_SIZE 524288
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#endif
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// Stats for debugging and optimization
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struct lfs_bd_stats {
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uint64_t read_count;
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uint64_t prog_count;
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uint64_t erase_count;
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};
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// The emu bd state
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typedef struct lfs_emubd {
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char *path;
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char *child;
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struct lfs_bd_info info;
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struct lfs_bd_stats stats;
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} lfs_emubd_t;
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// Create a block device using path for the directory to store blocks
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int lfs_emubd_create(lfs_emubd_t *emu, const char *path);
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// Clean up memory associated with emu block device
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void lfs_emubd_destroy(lfs_emubd_t *emu);
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// Read a block
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int lfs_emubd_read(lfs_emubd_t *bd, lfs_block_t block,
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lfs_off_t off, lfs_size_t size, void *buffer);
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// Program a block
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//
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// The block must have previously been erased.
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int lfs_emubd_prog(lfs_emubd_t *bd, lfs_block_t block,
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lfs_off_t off, lfs_size_t size, const void *buffer);
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// Erase a block
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//
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// A block must be erased before being programmed. The
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// state of an erased block is undefined.
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int lfs_emubd_erase(lfs_emubd_t *bd, lfs_block_t block,
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lfs_off_t off, lfs_size_t size);
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// Sync the block device
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int lfs_emubd_sync(lfs_emubd_t *bd);
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// Get a description of the block device
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//
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// Any unknown information may be left unmodified
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int lfs_emubd_info(lfs_emubd_t *bd, struct lfs_bd_info *info);
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// Get stats of operations on the block device
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//
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// Used for debugging and optimizations
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int lfs_emubd_stats(lfs_emubd_t *bd, struct lfs_bd_stats *stats);
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// Block device operations
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extern const struct lfs_bd_ops lfs_emubd_ops;
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#endif
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