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Introduction
properties and data of files and to format those structures to modify existing entries and
create new ones. Finally, an application-level interface must provide for the exigencies of
file and directory access.
1-2 μC/FS
μC/FS is a compact, reliable, high-performance file system. It offers full-featured file and
directory access with flexible device and volume management including support for
partitions.
Source Code: μC/FS is provided in ANSI-C source to licensees. The source code is written
to an exacting coding standard that emphasizes cleanness and readability. Moreover,
extensive comments pepper the code to elucidate its logic and describe global variables and
functions. Where appropriate, the code directly references standards and supporting
documents.
Device Drivers: Device drivers are available for most common media including SD/MMC
cards, NAND flash, NOR flash and IDE/CF. Each of these is written with a clear, layered
structure so that it can easily be ported to your hardware. The device driver structure is
simple—basically just initialization, read and write functions—so that μC/FS can easily be
ported to a new medium.
Devices and Volumes: Multiple media can be accessed simultaneously, including multiple
instances of the same type of medium (since all drivers are re-entrant). DOS partitions are
supported, so more than one volume can be located on a device. In addition, the logical
device driver allows a single volume to span several (typically identical) devices, such as a
bank of flash chips.
FAT: All standard FAT variants and features are supported including FAT12/FAT16/FAT32
and long file names, which encompasses Unicode file names. Files can be up to 4-GB and
volumes up to 8-TB (the standard maximum). An optional journaling module provides total
power fail-safety to the FAT system driver.
Application Programming Interface (API): μC/FS provides two APIs for file and
directory access. A standard POSIX-compatible API is provided, including functions like
fs_fwrite(), fs_fread() and fs_fsetpos() that have the same arguments and return values as
16
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