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/*
* Block device emulated in RAM
*
* Copyright (c) 2022, The littlefs authors.
* Copyright (c) 2017, Arm Limited. All rights reserved.
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef LFS_RAMBD_H
#define LFS_RAMBD_H
#include "lfs.h"
#include "lfs_util.h"
#ifdef __cplusplus
extern "C"
{
#endif
// Block device specific tracing
#ifndef LFS_RAMBD_TRACE
#ifdef LFS_RAMBD_YES_TRACE
#define LFS_RAMBD_TRACE(...) LFS_TRACE(__VA_ARGS__)
#else
#define LFS_RAMBD_TRACE(...)
#endif
#endif
// rambd config (optional)
struct lfs_rambd_config {
// Optional statically allocated buffer for the block device.
void *buffer;
};
// rambd state
typedef struct lfs_rambd {
uint8_t *buffer;
const struct lfs_rambd_config *cfg;
} lfs_rambd_t;
// Create a RAM block device using the geometry in lfs_config
int lfs_rambd_create(const struct lfs_config *cfg);
int lfs_rambd_createcfg(const struct lfs_config *cfg,
const struct lfs_rambd_config *bdcfg);
// Clean up memory associated with block device
int lfs_rambd_destroy(const struct lfs_config *cfg);
// Read a block
int lfs_rambd_read(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, void *buffer, lfs_size_t size);
// Program a block
//
// The block must have previously been erased.
int lfs_rambd_prog(const struct lfs_config *cfg, lfs_block_t block,
lfs_off_t off, const void *buffer, lfs_size_t size);
// Erase a block
//
// A block must be erased before being programmed. The
// state of an erased block is undefined.
int lfs_rambd_erase(const struct lfs_config *cfg, lfs_block_t block);
// Sync the block device
int lfs_rambd_sync(const struct lfs_config *cfg);
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
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