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https://github.com/eledio-devices/thirdparty-littlefs.git
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b55719bab1
Adopted buffer followed by size. The other order was original chosen due to some other functions with a more complicated parameter list. This convention is important, as the bd api is one of the main apis facing porting efforts.
79 lines
1.7 KiB
C
79 lines
1.7 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.h"
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#include "lfs_util.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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// 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 {
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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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} stats;
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struct {
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uint32_t read_size;
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uint32_t prog_size;
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uint32_t block_size;
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uint32_t block_count;
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} cfg;
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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(const struct lfs_config *cfg, const char *path);
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// Clean up memory associated with emu block device
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void lfs_emubd_destroy(const struct lfs_config *cfg);
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// Read a block
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int lfs_emubd_read(const struct lfs_config *cfg, lfs_block_t block,
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lfs_off_t off, void *buffer, lfs_size_t size);
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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(const struct lfs_config *cfg, lfs_block_t block,
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lfs_off_t off, const void *buffer, lfs_size_t size);
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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(const struct lfs_config *cfg, lfs_block_t block);
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// Sync the block device
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int lfs_emubd_sync(const struct lfs_config *cfg);
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#endif
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