Add 8052 IRQ test; Fix places where IDLE task could try to wait on semaphores
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@61 42af7a65-404d-4744-a932-0658087f49c3
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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>
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<hr>
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<center><h1><i>Under Construction</i></h1></center>
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<hr>
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<hr>
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<h1>Overview</h1>
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<center>
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<hr><hr>
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<h1><big><i>NuttX RTOS</i></big></h1>
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<p>Last Updated: March 14, 2007</p>
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<hr><hr>
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<h1>Table of Contents</h1>
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</center>
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<li><a href="#overview">Overview</a></li>
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<li><a href="#downloads">Downloads</a></li>
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<li><a href="#platforms">Supported Platforms</a></li>
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<li><a href="#footprint">Memory Footprint</a></li>
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<li><a href="#licensing">Licensing</a></li>
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<li><a href="#history">Release History</a></li>
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<li><a href="#documentation">Other Documentation</a></li>
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<a name="overview"><h1>Overview</h1></a>
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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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@ -60,7 +70,7 @@
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</p>
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</ol>
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<h1>Downloads</h1>
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<a name="downloads"><h1>Downloads</h1></a>
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<p>
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The initial release of NuttX (nuttx-0.1.0) is avalable for download
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@ -68,7 +78,7 @@
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website.
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</p>
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<h1>Supported Platforms</h1>
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<a name="platforms"><h1>Supported Platforms</h1></a>
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<ul>
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<li><b>Linux User Mode</b></li>
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@ -95,7 +105,9 @@
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and the <a href="http://sdcc.sourceforge.net/">SDCC</a> toolchain.
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</p>
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<p>
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STATUS: This port will require a few more weeks before it is ready for prime time.
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STATUS: 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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</p>
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<li><b>Other ports</b></li>
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<p>
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@ -106,7 +118,7 @@
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<blockquote>* A highly modified <a href="http://buildroot.uclibc.org/">buildroot</a>
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is available that be used to build a NuttX-compatible arm-elf toolchain.</blockquote>
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<h1>Memory Footprint</h1>
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<a name="footprint"><h1>Memory Footprint</h1></a>
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<p><b>C5471 (Arm7)</b>
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The build for this ARM7 target that includes most of the OS features and
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@ -118,11 +130,21 @@ is available that be used to build a NuttX-compatible arm-elf toolchain.</blockq
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53272 428 3568 57268 dfb4 nuttx
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</pre>
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<p><b>87C52</b>
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A reduced functionality OS test for the 8051 target requires only
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about 18Kb (see <a href="codesize-070301.xls">spreadsheet</a> for details).
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A reduced functionality OS test for the 8052 target requires only
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about 18-19Kb:
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</p>
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<pre>
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Stack starts at: 0x21 (sp set to 0x20) with 223 bytes available.
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<h1>Licensing</h1>
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Other memory:
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Name Start End Size Max
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---------------- -------- -------- -------- --------
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PAGED EXT. RAM 0 256
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EXTERNAL RAM 0x0100 0x02fd 510 7936
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ROM/EPROM/FLASH 0x2100 0x6e55 19798 24384
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</pre>
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<a name="licensing"><h1>Licensing</h1></a>
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<p>NuttX is available under the highly permissive
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<a href="http://en.wikipedia.org/wiki/BSD_license">BSD license</a>.
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@ -131,7 +153,45 @@ is available that be used to build a NuttX-compatible arm-elf toolchain.</blockq
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without any concern for jeopardizing any proprietary software that
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you may link with it.</p>
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<h1>Other Documentation</h1>
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<a name="history"><h1>Release History</h1></a>
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<pre>
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0.1.0 2007-03-09 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Initial Release
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* Support for Linux user mode simulation and TI
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TMS320C5471 (Arm7) provided
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0.1.1 2007-03-14 Gregory Nutt <spudmonkey@racsa.co.cr>
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* Corrected an error in interrupt level context switching
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for C5471
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* Added fgets() and gets() logic; verified c5471 console read.
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* Corrected error in reading from the C5471 serial port:
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Improper use of semaphore can cause deadlock.
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* Fixed an error in the memory cleanup: The idle task
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cannot take sempahores (because it must always be ready
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to run).
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* Tasks can now accept a configurable maximum number of
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input parameters (argc)
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* _task_init() was divided into separate functions that
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require fewer parameters. This was necessary to keep
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the stack usage down for the 8051/2 (which has only
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256 bytes of stack).
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* Attempts to use C5471 console from interrupt handlers
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can casue errors. Added a special path for this case.
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* Refuse calls to sem_wait and sem_trywait from interrupt
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handlers. This was happening because interrupt handlers
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were calling printf-like functions.
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* Added strtok() and strtok_r()
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* Added a simple shell called nsh (see examples/nsh).
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* Platform support for 8052 is complete but not stable
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when the timer interrupt is enabled. Seems to be an
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issue when SP enters indirect address space.
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* Documentation updates
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</pre>
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<a name="documentation"><h1>Other Documentation</h1></a>
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<li><a href="NuttxUserGuide.html">User Guide</li>
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<li><a href="NuttxPortingGuide.html">Porting Guide</li>
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