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Gregory Nutt
2015-02-02 06:45:31 -06:00
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<td> <td>
<h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1> <h1><big><font color="#3c34ec"><i>NuttX RTOS</i></font></big></h1>
<p>Last Updated: January 28, 2014</p> <p>Last Updated: February 2, 2014</p>
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<li>Atmel AVR <li>Atmel AVR
<ul> <ul>
<li><a href="#atmelavr">Atmel 8-bit AVR</a> (3) </li> <li><a href="#atmelavr">Atmel 8-bit AVR</a> (4) </li>
<li><a href="#atmelavr32">Atmel AVR32</a> (1) </li> <li><a href="#atmelavr32">Atmel AVR32</a> (1) </li>
</ul> </ul>
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<li>Atmel <li>Atmel
<ul> <ul>
<li><a href="#avratmega128">AVR ATMega128</a> <small>(8-bit AVR)</small></li> <li><a href="#avratmega128">AVR ATMega128</a> <small>(8-bit AVR)</small></li>
<li><a href="#avratmega1284p">AVR ATMega1284p</a> <small>(8-bit AVR)</small></li>
<li><a href="#avrat90usbxxx">AVR AT90USB64x and AT90USB6128x</a> <small>(8-bit AVR)</small></li> <li><a href="#avrat90usbxxx">AVR AT90USB64x and AT90USB6128x</a> <small>(8-bit AVR)</small></li>
<li><a href="#at32uc3bxxx">AVR32 AT32UC3BXXX</a> <small>(32-bit AVR32)</small></li> <li><a href="#at32uc3bxxx">AVR32 AT32UC3BXXX</a> <small>(32-bit AVR32)</small></li>
<li><a href="#at91samd20">Atmel SAMD20</a> <small>(ARM Cortex-M0+)</small></li> <li><a href="#at91samd20">Atmel SAMD20</a> <small>(ARM Cortex-M0+)</small></li>
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<p> <p>
<a name="avratmega128"><b>SoC Robotics ATMega128</b>.</a> <b>AVR ATMega</b>.
This port of NuttX to the Amber Web Server from <a href="http://www.soc-robotics.com/index.htm">SoC Robotics</a>
is partially completed.
The Amber Web Server is based on an Atmel ATMega128.
</p> </p>
<ul> <ul>
<p> <p>
<b>STATUS:</b> <a name="avratmega128"><b>SoC Robotics ATMega128</b>.</a>
Work on this port has stalled due to toolchain issues. Complete, but untested This port of NuttX to the Amber Web Server from <a href="http://www.soc-robotics.com/index.htm">SoC Robotics</a>
code for this port appears in the NuttX 6.5 release. is partially completed.
Refer to the NuttX board <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/amber/README.txt">README</a> file for further information. The Amber Web Server is based on an Atmel ATMega128.
</p> </p>
<ul>
<p>
<b>STATUS:</b>
Work on this port has stalled due to toolchain issues. Complete, but untested code for this port appears in the NuttX 6.5 release.
Refer to the NuttX board <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/amber/README.txt">README</a> file for further information.
</p>
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<p>
<a name="avratmega1284p"><b>LowPowerLab MoteinoMEGA</b>.</a>
This port of NuttX to the MoteinoMEGA from <a href="http://www.lowpowerlab.com">LowPowerLab</a>.
The MoteinoMEGA is based on an Atmel ATMega1284P.
See the LowPowerlab <a href="https://lowpowerlab.com/shop/index.php?_route_=Moteino/moteinomega">website</a> and the board <a href="http://sourceforge.net/p/nuttx/git/ci/master/tree/nuttx/configs/moteio-mega/README.txt">README</a> file for further information.
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<p>
<b>STATUS:</b>
The basic function port support the NuttShell (NSH) was contribute by Jedi Tek'Enum and first appeard in the NuttX 7.8 release.
</p>
</ul>
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<p><b>AVR-Specific Issues</b>. <p><b>AVR-Specific Issues</b>.
The basic AVR port is solid and biggest issue for using AVR is its tiny SRAM memory and its Harvard architecture. The basic AVR port is solid.
The biggest issue for using AVR is its tiny SRAM memory and its Harvard architecture.
Because of the Harvard architecture, constant data that resides to flash is inaccessible using &quot;normal&quot; memory reads and writes (only SRAM data can be accessed &quot;normally&quot;). Because of the Harvard architecture, constant data that resides to flash is inaccessible using &quot;normal&quot; memory reads and writes (only SRAM data can be accessed &quot;normally&quot;).
Special AVR instructions are available for accessing data in FLASH, but these have not been integrated into the normal, general purpose OS. Special AVR instructions are available for accessing data in FLASH, but these have not been integrated into the normal, general purpose OS.
</p> </p>
<p> <p>
Most NuttX test applications are console-oriented with lots of strings used for printf and debug output. Most NuttX test applications are console-oriented with lots of strings used for <code>printf()</code> and debug output.
These strings are all stored in SRAM now due to these data accessing issues and even the smallest console-oriented applications can quickly fill a 4-8K memory. These strings are all stored in SRAM now due to these data accessing issues and even the smallest console-oriented applications can quickly fill a 4-8K memory.
So, in order for the AVR port to be useful, one of two things would need to be done: So, in order for the AVR port to be useful, one of two things would need to be done:
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