📄 micrium products file system.htm
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<P><A
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size=2>Licensing</FONT></A></P></TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD>
<P></P>
<P class=titleBIG>The licensing link above also contains pricing request
information. </P>
<P></P>
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color=#ff0000>Product Datasheet</FONT></B></FONT></DIV></TD>
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<P align=center><SPAN class=subtitle>Download a compiled library,
user manual and sample code<BR>for the Windows environment.
<BR></SPAN><BR><A
href="http://www.ucos-ii.com/contents/products/FileSystem/trialfs.html"><FONT
size=3>Trial Download</FONT></A></P></DIV></TD></TR></TBODY></TABLE>
<P></P></TD></TR>
<TR>
<TD class=titleBIG vAlign=top bgColor=#ced6f0 colSpan=2
height=25>Introduction</TD></TR>
<TR>
<TD vAlign=top colSpan=2><B>礐/FS</B> is a FAT file system which can be
used on any media, for which you can provide basic hardware access
functions. <B>礐/FS</B> is a high performance library that has been
optimized for speed, versatility and memory footprint. </TD></TR>
<TR>
<TD class=titleBIG vAlign=top bgColor=#ced6f0 colSpan=2
height=25>Features</TD></TR>
<TR>
<TD>
<P><B>礐/FS</B> is written in ANSI C and can be used on virtually any CPU.
Some of the features of <B>礐/FS</B> are:<BR></P>
<UL>
<LI> MS-DOS/MS-Windows compatible FAT12, FAT16 and FAT32 support.
<BR><BR>
<LI> Multiple device driver support. You can use different device
drivers with <B>礐/FS</B>, which allows you to access different types of
hardware with the file system at the same time. <BR><BR>
<LI> Multiple media support. A device driver allows you to access
different medias at the same time. <BR><BR>
<LI> OS support. <B>礐/FS</B> can easily be integrated into any OS
including <B>礐/OS-II</B>. You can thus make file operations in a
multithreaded environment. <BR><BR>
<LI> ANSI C stdio.h like API for user applications. An application
using standard C I/O library can easily be ported to use<B> 礐/FS</B>.
<BR><BR>
<LI> Very simple device driver structure. <B>礐/FS</B> device
drivers need only very basic functions for reading and writing blocks.
Therefore it is very simple to support your custom hardware. <BR><BR>
<LI> Generic device driver for SmartMedia cards, which can easily
be used with any kind of card reader hardware. <BR></LI></UL></TD></TR>
<TR>
<TD class=titleBIG vAlign=top bgColor=#ced6f0 colSpan=2 height=25>Basic
concepts</TD></TR>
<TR>
<TD>
<P><B>礐/FS</B> is organized in different layers. </P>
<TABLE borderColor=#00004c cellSpacing=0 cellPadding=3 width="100%"
border=1>
<TBODY>
<TR>
<TD width="15%" bgColor=#ced6f0><FONT size=+0><B>Layer</B></FONT></TD>
<TD align=middle width="85%" bgColor=#ced6f0><FONT
size=+0><B>Description</B></FONT></TD></TR>
<TR>
<TD vAlign=top width="15%"><A
href="http://www.ucos-ii.com/contents/products/file_system.html#">API</A></TD>
<TD width="85%">The API layer is the interface between <B>礐/FS</B>
and the user application. It contains a library of ANSI C oriented
file functions, such as FS_FOpen(), FS_FWrite() etc. The API layer
transfers these calls to the file system layer. Currently we only
provide a FAT file system layer for <B>礐/FS</B>, but the API layer
can deal with different file system layers at the same time. So it
is possible to use FAT and any other file system concurrently with
<B>礐/FS</B>.</TD></TR>
<TR>
<TD vAlign=top width="15%"><A
href="http://www.ucos-ii.com/contents/products/file_system.html#">File
System</A></TD>
<TD width="85%">This layer translates file operations to logical
block operations. After such a translation, the file system calls
the logical block layer and specifies the corresponding device
driver for a device.</TD></TR>
<TR>
<TD width="15%"><A
href="http://www.ucos-ii.com/contents/products/file_system.html#">Logical
Block</A></TD>
<TD width="85%">The main purpose of the logical block layer is to
synchronize accesses to a device driver and to have an easy
interface for the file system layer. The logical block layer calls a
device driver to make a block operation.</TD></TR>
<TR>
<TD width="15%"><A
href="http://www.ucos-ii.com/contents/products/file_system.html#">Device
driver</A></TD>
<TD width="85%">Device Drivers are low level routines that are used
to access your hardware. The structure of the device driver is
simple to allow easy integration of your
hardware.</TD></TR></TBODY></TABLE></TD></TR>
<TR>
<TD class=titleBIG vAlign=top bgColor=#ced6f0 colSpan=2 height=25>OS
Integration</TD></TR>
<TR>
<TD><B>礐/FS</B> is suitable for usage with just about any multithreaded
environment. To ensure that different tasks can access the file system
concurently, you have to implement a few operating system dependent
functions. <B>礐/OS-II</B> functions are included with <B>礐/FS</B>.</TD></TR>
<TR>
<TD class=titleBIG vAlign=top bgColor=#ced6f0 colSpan=2 height=25>Device
Drivers </TD></TR>
<TR>
<TD>
<P><B>礐/FS</B> has been designed to cooperate with any kind of hardware.
To use a specific hardware with <B>礐/FS</B>, a device driver for that
hardware is required. The device driver consists of basic I/O functions
for accessing the hardware and a global table, which holds pointers to
these functions.</P>
<P>Available drivers are:</P>
<UL>
<LI> RAM disk <BR><BR>
<LI> SMC (Smart Card)<BR><BR>
<LI> MMC (Multimedia Card)<BR><BR>
<LI> SD (Secure Digital)<BR><BR>
<LI> CF (Compact Flash)<BR><BR>
<LI> Windows (used by the Visual C++ demonstration and simulation
code)<BR><BR>
<LI> IDE Hard Disk<BR><BR>
<LI> Xilinx System ACE<BR><BR>
<LI> Linear Flash memory<BR><BR></LI></UL>
<P>Drivers available soon:<BR></P>
<UL>
<LI> Floppy <BR><BR>
<LI> CD (Compact Disk) <BR><BR></LI></UL></TD></TR>
<TR>
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