Marco Zecchini
Rtos API example
Diff: mbed-os/features/filesystem/fat/FATFileSystem.h
- Revision:
- 0:9fca2b23d0ba
diff -r 000000000000 -r 9fca2b23d0ba mbed-os/features/filesystem/fat/FATFileSystem.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os/features/filesystem/fat/FATFileSystem.h Sat Feb 23 12:13:36 2019 +0000
@@ -0,0 +1,266 @@
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2012 ARM Limited
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+#ifndef MBED_FATFILESYSTEM_H
+#define MBED_FATFILESYSTEM_H
+
+#include "FileSystem.h"
+#include "BlockDevice.h"
+#include "FileHandle.h"
+#include "ff.h"
+#include <stdint.h>
+#include "PlatformMutex.h"
+
+using namespace mbed;
+
+/**
+ * FATFileSystem based on ChaN's Fat Filesystem library v0.8
+ */
+class FATFileSystem : public FileSystem {
+public:
+ /** Lifetime of the FATFileSystem
+ *
+ * @param name Name to add filesystem to tree as
+ * @param bd BlockDevice to mount, may be passed instead to mount call
+ */
+ FATFileSystem(const char *name = NULL, BlockDevice *bd = NULL);
+ virtual ~FATFileSystem();
+
+ /** Formats a logical drive, FDISK partitioning rule.
+ *
+ * The block device to format should be mounted when this function is called.
+ *
+ * @param bd
+ * This is the block device that will be formatted.
+ *
+ * @param cluster_size
+ * This is the number of bytes per cluster. A larger cluster size will decrease
+ * the overhead of the FAT table, but also increase the minimum file size. The
+ * cluster_size must be a multiple of the underlying device's allocation unit
+ * and is currently limited to a max of 32,768 bytes. If zero, a cluster size
+ * will be determined from the device's allocation unit. Defaults to zero.
+ *
+ * @return 0 on success, negative error code on failure
+ */
+ static int format(BlockDevice *bd, bd_size_t cluster_size = 0);
+
+ /** Mounts a filesystem to a block device
+ *
+ * @param bd BlockDevice to mount to
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int mount(BlockDevice *bd);
+
+ /** Unmounts a filesystem from the underlying block device
+ *
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int unmount();
+
+ /** Reformats a filesystem, results in an empty and mounted filesystem
+ *
+ * @param bd
+ * BlockDevice to reformat and mount. If NULL, the mounted
+ * block device will be used.
+ * Note: if mount fails, bd must be provided.
+ * Default: NULL
+ *
+ * @param allocation_unit
+ * This is the number of bytes per cluster size. The valid value is N
+ * times the sector size. N is a power of 2 from 1 to 128 for FAT
+ * volume and upto 16MiB for exFAT volume. If zero is given,
+ * the default allocation unit size is selected by the underlying
+ * filesystem, which depends on the volume size.
+ *
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int reformat(BlockDevice *bd, int allocation_unit);
+
+ /** Reformats a filesystem, results in an empty and mounted filesystem
+ *
+ * @param bd BlockDevice to reformat and mount. If NULL, the mounted
+ * block device will be used.
+ * Note: if mount fails, bd must be provided.
+ * Default: NULL
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int reformat(BlockDevice *bd = NULL)
+ {
+ // required for virtual inheritance shenanigans
+ return reformat(bd, 0);
+ }
+
+ /** Remove a file from the filesystem.
+ *
+ * @param path The name of the file to remove.
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int remove(const char *path);
+
+ /** Rename a file in the filesystem.
+ *
+ * @param path The name of the file to rename.
+ * @param newpath The name to rename it to
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int rename(const char *path, const char *newpath);
+
+ /** Store information about the file in a stat structure
+ *
+ * @param path The name of the file to find information about
+ * @param st The stat buffer to write to
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int stat(const char *path, struct stat *st);
+
+ /** Create a directory in the filesystem.
+ *
+ * @param path The name of the directory to create.
+ * @param mode The permissions with which to create the directory
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int mkdir(const char *path, mode_t mode);
+
+protected:
+ /** Open a file on the filesystem
+ *
+ * @param file Destination for the handle to a newly created file
+ * @param path The name of the file to open
+ * @param flags The flags to open the file in, one of O_RDONLY, O_WRONLY, O_RDWR,
+ * bitwise or'd with one of O_CREAT, O_TRUNC, O_APPEND
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int file_open(fs_file_t *file, const char *path, int flags);
+
+ /** Close a file
+ *
+ * @param file File handle
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int file_close(fs_file_t file);
+
+ /** Read the contents of a file into a buffer
+ *
+ * @param file File handle
+ * @param buffer The buffer to read in to
+ * @param len The number of bytes to read
+ * @return The number of bytes read, 0 at end of file, negative error on failure
+ */
+ virtual ssize_t file_read(fs_file_t file, void *buffer, size_t len);
+
+ /** Write the contents of a buffer to a file
+ *
+ * @param file File handle
+ * @param buffer The buffer to write from
+ * @param len The number of bytes to write
+ * @return The number of bytes written, negative error on failure
+ */
+ virtual ssize_t file_write(fs_file_t file, const void *buffer, size_t len);
+
+ /** Flush any buffers associated with the file
+ *
+ * @param file File handle
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int file_sync(fs_file_t file);
+
+ /** Move the file position to a given offset from from a given location
+ *
+ * @param file File handle
+ * @param offset The offset from whence to move to
+ * @param whence The start of where to seek
+ * SEEK_SET to start from beginning of file,
+ * SEEK_CUR to start from current position in file,
+ * SEEK_END to start from end of file
+ * @return The new offset of the file
+ */
+ virtual off_t file_seek(fs_file_t file, off_t offset, int whence);
+
+ /** Get the file position of the file
+ *
+ * @param file File handle
+ * @return The current offset in the file
+ */
+ virtual off_t file_tell(fs_file_t file);
+
+ /** Get the size of the file
+ *
+ * @param file File handle
+ * @return Size of the file in bytes
+ */
+ virtual off_t file_size(fs_file_t file);
+
+ /** Open a directory on the filesystem
+ *
+ * @param dir Destination for the handle to the directory
+ * @param path Name of the directory to open
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int dir_open(fs_dir_t *dir, const char *path);
+
+ /** Close a directory
+ *
+ * @param dir Dir handle
+ * @return 0 on success, negative error code on failure
+ */
+ virtual int dir_close(fs_dir_t dir);
+
+ /** Read the next directory entry
+ *
+ * @param dir Dir handle
+ * @param ent The directory entry to fill out
+ * @return 1 on reading a filename, 0 at end of directory, negative error on failure
+ */
+ virtual ssize_t dir_read(fs_dir_t dir, struct dirent *ent);
+
+ /** Set the current position of the directory
+ *
+ * @param dir Dir handle
+ * @param offset Offset of the location to seek to,
+ * must be a value returned from dir_tell
+ */
+ virtual void dir_seek(fs_dir_t dir, off_t offset);
+
+ /** Get the current position of the directory
+ *
+ * @param dir Dir handle
+ * @return Position of the directory that can be passed to dir_rewind
+ */
+ virtual off_t dir_tell(fs_dir_t dir);
+
+ /** Rewind the current position to the beginning of the directory
+ *
+ * @param dir Dir handle
+ */
+ virtual void dir_rewind(fs_dir_t dir);
+
+private:
+ FATFS _fs; // Work area (file system object) for logical drive
+ char _fsid[sizeof("0:")];
+ int _id;
+
+protected:
+ virtual void lock();
+ virtual void unlock();
+ virtual int mount(BlockDevice *bd, bool mount);
+};
+
+#endif