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📁 scmRTOS is real-time preemptive operating system and supports up to 31 user processes (and one syste
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<title>scmRTOS - Single-Chip Microcontroller Real-Time Operating System</title>
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        <td><h1><nobr>Single-Chip Microcontroller</nobr></h1><br>
        <div id="subtitle"><nobr>Real-Time Operating System</nobr></div></td>
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<tr><th class="head">scmRTOS</th>
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<tr><td><a class="reference" href="description.html">Description</a></td>
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<h1><a id="synopsis" name="synopsis">Synopsis</a></h1>
<p>scmRTOS is a free tiny preemptive Real-Time Operating System intended for use
with Single-Chip Microcontrollers.</p>
<p>scmRTOS is capable to run on small uCs with as little amount of RAM as 512 bytes.
The RTOS is written on C++. All source code is available. Five target platforms
are supported for now:</p>
<ul class="simple">
<li>MSP430 (Texas Instruments);</li>
<li>AVR (Atmel);</li>
<li>Blackfin (Analog Devices);</li>
<li>ARM7;</li>
<li>FR (Fujitsu).</li>
</ul>
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<h1><a id="features" name="features">Features:</a></h1>
<ul class="simple">
<li><strong>Preemptive multitasking.</strong></li>
<li><strong>Up to 31 user processes (tasks).</strong></li>
<li><strong>Fast interprocess program control flow transfer:</strong><ul>
<li>MSP430: 45-50 us &#64;5MHz.</li>
<li>AVR:  38-42 us &#64;8MHz.</li>
<li>Blackfin:  1.5 us &#64;200 MHz.</li>
<li>ARM7: 5us &#64;50 MHz (ARM mode), 8 us &#64;50 MHz (Thumb mode).</li>
<li>FR:  10 us &#64;32MHz.</li>
</ul>
</li>
<li><strong>Low Resource Requirements:</strong><ul>
<li>Code: from about 1 kilobyte (depend on application and target platform).</li>
<li>Kernel Data:  8 + 2*Process Count.</li>
<li>Process Data: 5 bytes.</li>
</ul>
</li>
<li><strong>Supports separate return stack (required for IAR EW AVR).</strong></li>
<li><strong>Two methods of program control flow passing:</strong><ul>
<li>Direct context switcher call.</li>
<li>Software Interrupt context switch.</li>
</ul>
</li>
<li><strong>Interprocess communication:</strong><ul>
<li>Fast Event Flags (binary semaphores).</li>
<li>Mutual Exclusion Semaphores (Mutexes).</li>
<li>Byte-wide Channels (queues of &quot;raw&quot; data).</li>
<li>Arbitrary-type Channels (queues of arbitrary-type objects).</li>
<li>Messages.</li>
</ul>
</li>
<li><strong>Optional software switch on separate ISR stack on some platforms.</strong></li>
<li><strong>Support of various target hardware features such as hardware shifters etc., for more efficiency.</strong></li>
</ul>
<p>See <a class="reference" href="doc/index.html">User's Manual</a> and other <a class="reference" href="doc/index.html">documentation</a> for more details.</p>
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        <td align="right">Copyright 漏 scmRTOS Team 2006-2008</td>
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