d586fa633b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@484 42af7a65-404d-4744-a932-0658087f49c3
799 lines
18 KiB
HTML
799 lines
18 KiB
HTML
<html>
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<head>
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<title>NuttX</title>
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</head>
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<body background="backgd.gif">
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<hr><hr>
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<table width ="100%">
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<tr align="center" bgcolor="#e4e4e4">
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<td>
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<h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
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<p>Last Updated: January 1, 2008</p>
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<hr><hr>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<h1>Table of Contents</h1>
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</table>
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<center><table width ="80%">
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<td>
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<table>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#overview">Overview</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#downloads">Downloads</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#platforms">Supported Platforms</a></td>
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<td><img src="favicon.ico"></td>
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<td><a href="#footprint">Memory Footprint</a></td>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#licensing">Licensing</a></td>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#history">Release History</a></td>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#TODO">Bugs, Issues, <i>Things-To-Do</i></a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#documentation">Other Documentation</a></td>
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</tr>
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<tr>
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<td><img src="favicon.ico"></td>
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<td><a href="#trademarks">Trademarks</a></td>
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</tr>
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</table>
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</td>
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</td>
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</table></center>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="overview"><h1>Overview</h1></a>
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</td>
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</tr>
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</table>
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<p>
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<b>Goals</b>.
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Nuttx is a real timed embedded operating system (RTOS).
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Its goals are:
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<p>
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<center><table width="90%">
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Small Footprint</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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Usable in all but the tightest micro-controller environments,
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The focus is on the tiny-to-small, deeply embedded environment.
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Rich Feature OS Set</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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The goal is to provide implementations of most standard POSIX OS interfaces
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to support a rich, multi-threaded development environment for deeply embedded
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processors.
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</p>
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NON-GOALS: (1) It is not a goal to provide the rich level of OS
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features like those provided with Linux.
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Small footprint is more important than features.
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Standard compliance is more important than small footprint.
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(2) There is no MMU-based support for processes.
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At present, NuttX assumes a flat address space.
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Highly Scalable</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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Fully scalable from tiny (8-bit) to moderate embedded (32-bit).
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Scalability with rich feature set is accomplished with:
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Many tiny source files, link from static libraries, highly configurable, use of
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weak symbols when available.
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Standards Compliance</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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NuttX strives to achieve a high degree of standards compliance.
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The primary governing standards are POSIX and ANSI standards.
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Additional standard APIs from Unix and other common RTOS's are
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adopted for functionality not available under these standards
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or for functionaly that is not appropriate for the deeply-embedded
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RTOS (such as <code>fork()</code>).
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</p>
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<p>
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Because of this standards conformance, software developed under other
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standard OSs (such as Linux) should port easily to NuttX.
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Real-Time</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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Fully pre-emptible, fixed priority and round-robin scheduling.
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Totally Open</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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Non-restrictive BSD license.
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</p>
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</tr>
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</table></center>
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<p>
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<b>Feature Set</b>.
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Key features of NuttX include:
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<p>
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<center><table width="90%">
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Standards Compliant Core Task Management</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Modular, micro-kernel</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Fully pre-emptible.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Naturally scalable.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Easily extensible to new processor architectures, SoC architecture, or board architectures.
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A <a href="NuttxPortingGuide.html">Porting Guide</a> is in development.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>FIFO and round-robin scheduling.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Realtime, deterministic.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>POSIX/ANSI-like task controls, named message queues, counting semaphores, clocks/timers, signals, pthreads, environment variables, filesystem.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>VxWorks-like task management and watchdog timers.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>BSD socket interface.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Extensions to manage pre-emption.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Well documented in the NuttX <a href="NuttxUserGuide.html">User Guide</a>.</li>
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>File system</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Tiny in-memory, root pseudo-file-system.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Supports character and block drivers.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Network and serial driver architecture.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Mount-able volumes. Bind mountpoint, filesystem, and block device driver.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>VFAT filesystem support.</li>
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>C Library</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Fully integrated into the OS.</li>
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</p>
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</tr>
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<tr>
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<td valign="top" width="18"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Networking</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>TCP/IP, UDP, ICMP stacks.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Small footprint (based on uIP).</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>BSD compatible socket layer.</li>
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</p>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<li>Networking utilities.</li>
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</p>
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</tr>
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</table></center>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="downloads"><h1>Downloads</h1></a>
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</td>
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</tr>
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</table>
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<p>
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The 17th release of NuttX (nuttx-0.3.5) is available for download
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from the <a href="http://sourceforge.net/project/showfiles.php?group_id=189573">SourceForge</a>
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website.
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The change log associated with the release is available <a href="#currentrelease">here</a>.
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Unreleased changes after this release are avalable in CVS.
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These unreleased changes are listed <a href="#pendingchanges">here</a>.
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</p>
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<p>
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NuttX 0.3.5 is the 6th release containing the integration of a network
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subsystem and the uIP TCP/IP, UDP, and ICMP stacks based on
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<a href="http://www.sics.se/~adam/uip/index.php/Main_Page">uIP</a>
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into NuttX.
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</p>
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<p>
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This release is primarily a bug-fix release and intended to synchronize
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with the current CVS contents. See the <a href="#currentrelease">ChangeLog</a>
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for a detailed list of changes and fixes.
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</p>
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<p>
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The level of network reliability is at a strong beta release level. The
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baseline functionality of NuttX continues to mature and remains at
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post-beta or production level.
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Extensive testing has been done for the ARM architecture using the GCC
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compiler/toolchain.
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Other architectures and the SDCC toolchain are also supported but not as
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well exercised.
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</p>
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<p>
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This release was verified only on the Spectrum Digital C5471 EVM using
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the C5471 Ethernet driver. Any feedback about bugsor suggestions for
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improvement would be greatly appreciated.
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</p>
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<table width ="100%">
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<tr bgcolor="#e4e4e4">
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<td>
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<a name="platforms"><h1>Supported Platforms</h1></a>
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</td>
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</tr>
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</table>
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<center><table width="90%">
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Linux User Mode</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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A user-mode port of NuttX to the x86 Linux platform is available.
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The purpose of this port is primarily to support OS feature developement.
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</p>
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<p>
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<b>STATUS:</b>
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Does not support interrupts but is otherwise fully functional.
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</p>
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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>ARM7TDMI</b>.
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<b>TI TMS320C5471</b> (also called <b>C5471</b> or <b>TMS320DA180</b> or <b>DA180</b>).
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NuttX operates on the ARM7 of this dual core processor.
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This port uses the <a href="http://www.spectrumdigital.com/">Spectrum Digital</a>
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evaluation board with a GNU arm-elf toolchain* under Linux or Cygwin.
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</p>
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<p>
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<b>STATUS:</b>
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This port is complete, verified, and included in the initial NuttX release.
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</p>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<b>NXP LPC214x</b>.
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Support is provided for the NXP LPC214x family of processors. In particular,
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support is provided for the mcu123.com lpc214x evaluation board (LPC2148).
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This port also used the GNU arm-eld toolchain* under Linux or Cygwin.
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</p>
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<p>
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<b>STATUS:</b>
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Initial coding of this port code complete but has not yet been verified.
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</p>
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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>ARM926EJS</b>.
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<b>TI TMS320DM320</b> (also called <b>DM320</b>).
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NuttX operates on the ARM9 of this dual core processor.
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This port uses the
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<a href="http://wiki.neurostechnology.com/index.php/Developer_Welcome">Neuros OSD</a>
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with a GNU arm-elf toolchain* under Linux or Cygwin.
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</p>
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<p>
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<b>STATUS:</b>
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This port is complete and verified.
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</p>
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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>8052 Microcontroller</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<b>PJRC 87C52 Development Board</b>.
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This port uses the <a href="http://www.pjrc.com/">PJRC</a> 87C52 development system
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and the <a href="http://sdcc.sourceforge.net/">SDCC</a> toolchain under Linux or Cygwin.
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</p>
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<p>
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<b>STATUS:</b>
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This port is complete but not stable with timer interrupts enabled.
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There seems to be some issue when the stack pointer enters into the indirect IRAM
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address space during interrupt handling.
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This architecture has not been built in some time will likely have some compilation
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problems because of SDCC compiler differences.
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</p>
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</td>
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</tr>
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<tr>
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<td valign="top"><img src="favicon.ico"></td>
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<td bgcolor="#5eaee1">
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<b>Z80</b>
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</td>
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</tr>
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<tr>
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<td><br></td>
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<td>
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<p>
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<b>Z80 Instruction Set Simulator</b>.
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This port uses the <a href="http://sdcc.sourceforge.net/">SDCC</a> toolchain
|
|
under Linux or Cygwin (verfied using version 2.6.0).
|
|
This port has been verified using only a Z80 instruction simulator.
|
|
That simulator can be found in the NuttX CVS
|
|
<a href="http://nuttx.cvs.sourceforge.net/nuttx/misc/sims/z80sim/">here</a>.
|
|
</p>
|
|
<p>
|
|
<b>STATUS:</b>
|
|
This port is complete and stable to the extent that it can be teste
|
|
using an instruction set simulator.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td valign="top"><img src="favicon.ico"></td>
|
|
<td bgcolor="#5eaee1">
|
|
<b>Other ports</b>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><br></td>
|
|
<td>
|
|
<p>
|
|
There are partial ports for the TI TMS320DM270 and for MIPS.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
</table></center>
|
|
|
|
<blockquote>* A highly modified <a href="http://buildroot.uclibc.org/">buildroot</a>
|
|
is available that may be used to build a NuttX-compatible arm-elf toolchain under
|
|
Linux or Cygwin.</blockquote>
|
|
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="footprint"><h1>Memory Footprint</h1></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<ul>
|
|
<p><b>C5471 (ARM7)</b>
|
|
The build for this ARM7 target that includes most of the OS features and
|
|
a broad range of OS tests. The size of this executable as given by the
|
|
Linux <tt>size</tt> command is (3/9/07):
|
|
</p>
|
|
<pre>
|
|
text data bss dec hex filename
|
|
53272 428 3568 57268 dfb4 nuttx
|
|
</pre>
|
|
<p><b>DM320 (ARM9)</b>
|
|
This build for the ARM9 target includes a significant subset of OS
|
|
features, a filesystem, Ethernet driver, full TCP/IP, UDP and (minimal)
|
|
ICMP stacks (via uIP) and a small network test application: (11/8/07,
|
|
configuration netconfig, examples/nettest)
|
|
</p>
|
|
<pre>
|
|
text data bss dec hex filename
|
|
49472 296 3972 53740 d1ec nuttx
|
|
</pre>
|
|
<p>
|
|
Another build for the ARM9 target includes a minimal OS feature
|
|
set, Ethernet driver, full TCP/IP and (minimal) ICMP stacks, and
|
|
a small webserver: (11/20/07, configuration uipconfig, examples/uip)
|
|
</p>
|
|
<pre>
|
|
text data bss dec hex filename
|
|
52040 72 4148 56260 dbc4 nuttx
|
|
</pre>
|
|
<p><b>87C52</b>
|
|
A reduced functionality OS test for the 8052 target requires only
|
|
about 18-19Kb:
|
|
</p>
|
|
<pre>
|
|
Stack starts at: 0x21 (sp set to 0x20) with 223 bytes available.
|
|
|
|
Other memory:
|
|
Name Start End Size Max
|
|
---------------- -------- -------- -------- --------
|
|
PAGED EXT. RAM 0 256
|
|
EXTERNAL RAM 0x0100 0x02fd 510 7936
|
|
ROM/EPROM/FLASH 0x2100 0x6e55 19798 24384
|
|
</pre>
|
|
</ul>
|
|
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="licensing"><h1>Licensing</h1></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<ul>
|
|
<p>
|
|
NuttX is available under the highly permissive
|
|
<a href="http://en.wikipedia.org/wiki/BSD_license">BSD license</a>.
|
|
Other than some fine print that you agree to respect the copyright
|
|
you should feel absolutely free to use NuttX in any environment and
|
|
without any concern for jeopardizing any proprietary software that
|
|
you may link with it.
|
|
</p>
|
|
</ul>
|
|
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="history"><h1>Release History</h1></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<ul>
|
|
<p>
|
|
The current NuttX Change Log is available in CVS <a href="http://nuttx.cvs.sourceforge.net/*checkout*/nuttx/nuttx/ChangeLog">here</a>.
|
|
ChangeLog snapshots associated with the current release are available below.
|
|
</p>
|
|
</ul>
|
|
|
|
<center><table width ="80%">
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td>
|
|
<a href="ChangeLog.txt">Change Logs for all releases</a><br>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td>
|
|
<a href="#currentrelease">ChangeLog for Current Release</a><br>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td>
|
|
<a href="#pendingchanges">Unreleased Changes</a>
|
|
</td>
|
|
</tr>
|
|
</table></center>
|
|
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="currentrelease">ChangeLog for Current Release</a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<pre><ul>
|
|
0.3.5 2007-12-18 Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
|
|
* Added inet_ntoa() and ether_ntoa()
|
|
* Added netdev_foreach() to support traversal of registered network devices
|
|
* Added support for 'ifconfig' command to NSH (examples/nsh)
|
|
* Moved MAC and ethernet definitions to net/ethernet.h
|
|
* Fix sim and DM90x0 compilation errors introduced in 0.3.4
|
|
* Fixed errors in C5471 configuration files for examples/uip
|
|
* Modified DHCPC (netutils/dhcpc) so that it should work in environments where
|
|
there are more than one DHCPD server.
|
|
* NSH ifconfig command now shows uIP status was well (examples/nsh)
|
|
</pre></ul>
|
|
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="pendingchanges">Unreleased Changes</a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<pre><ul>
|
|
0.3.6 2007-xx-xx Gregory Nutt <spudmonkey@racsa.co.cr>
|
|
|
|
* Changes for use with SDCC compiler
|
|
* Added a simulated z80 target
|
|
* Fix deadlock errors when using stdio but with no buffering
|
|
</pre></ul>
|
|
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="TODO"><h1>Bugs, Issues, <i>Things-To-Do</i></h1></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<ul>
|
|
<p>
|
|
The current list of NuttX <i>Things-To-Do</i> in CVS <a href="http://nuttx.cvs.sourceforge.net/*checkout*/nuttx/nuttx/TODO">here</a>.
|
|
A snapshot of the <i>To-Do</i> list associated with the current release are available <a href="TODO.txt">here</a>.
|
|
</p>
|
|
</ul>
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="documentation"><h1>Other Documentation</h1></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<ul><table>
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td><a href="NuttxUserGuide.html">User Guide</a></td>
|
|
</tr>
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td><a href="NuttxPortingGuide.html">Porting Guide</a></td>
|
|
</tr>
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td><a href="ChangeLog.txt">Change Log</a></td>
|
|
</tr>
|
|
<tr>
|
|
<td><img src="favicon.ico"></td>
|
|
<td><a href="TODO.txt">To-Do List</a></td>
|
|
</tr>
|
|
</center></ul>
|
|
|
|
<small>
|
|
<table width ="100%">
|
|
<tr bgcolor="#e4e4e4">
|
|
<td>
|
|
<a name="trademarks"><h1>Trademarks</h1></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
<ul>
|
|
<li>ARM, ARM7 ARM7TDMI, ARM9, ARM926EJS are trademarks of Advanced RISC Machines, Limited.</li>
|
|
<li>Cygwin is a trademark of Red Hat, Incorporated.</li>
|
|
<li>Linux is a registered trademark of Linus Torvalds.</li>
|
|
<li>LPC2148 is a trademark of NXP Semiconductors.</li>
|
|
<li>TI is a tradename of Texas Instruments Incorporated.</li>
|
|
<li>UNIX is a registered trademark of The Open Group.</li>
|
|
<li>VxWorks is a registered trademark of Wind River Systems, Incorporated.</li>
|
|
<li>Z80 is a registered trademark of Zilog, Inc.</li>
|
|
</ul>
|
|
<p>
|
|
NOTE: NuttX is <i>not</i> licensed to use the POSIX trademark. NuttX uses the POSIX
|
|
standard as a development guideline only.
|
|
</p>
|
|
</small>
|
|
|
|
</body>
|
|
</html>
|
|
|