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| <section id="microchip-at90usb"> |
| <h1>Microchip AT90USB<a class="headerlink" href="#microchip-at90usb" title="Permalink to this heading"></a></h1> |
| <section id="avr-at90usb64x-and-at90usb6128x"> |
| <h2>AVR AT90USB64x and AT90USB6128x<a class="headerlink" href="#avr-at90usb64x-and-at90usb6128x" title="Permalink to this heading"></a></h2> |
| <p><strong>Micropendous 3 AT90USB64x</strong> and <strong>AT90USB6128x</strong>. This port of NuttX |
| to the Opendous Micropendous 3 board. The Micropendous3 is may be |
| populated with an AT90USB646, 647, 1286, or 1287. I have only the |
| AT90USB647 version for testing. This version have very limited memory |
| resources: 64K of FLASH and 4K of SRAM.</p> |
| <p><strong>PJRC Teensy++ 2.0 AT90USB1286</strong>. This is a port of NuttX to the PJRC |
| Teensy++ 2.0 board. This board was developed by |
| <a class="reference external" href="http://pjrc.com/teensy/">PJRC</a>. The Teensy++ 2.0 is based on an |
| Microchip AT90USB1286 MCU.</p> |
| <p><strong>AVR-Specific Issues</strong>. 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 “normal” memory reads and writes (only SRAM data |
| can be accessed “normally”). Special AVR instructions are available for |
| accessing data in FLASH, but these have not been integrated into the |
| normal, general purpose OS.</p> |
| <p>Most NuttX test applications are console-oriented with lots of strings |
| used for <code class="docutils literal notranslate"><span class="pre">printf()</span></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. So, in |
| order for the AVR port to be useful, one of two things would need to be |
| done:</p> |
| <ol class="arabic simple"> |
| <li><p>Don’t use console applications that required lots of strings. The |
| basic AVR port is solid and your typical deeply embedded application |
| should work fine. Or,</p></li> |
| <li><p>Create a special version of printf that knows how to access strings |
| that reside in FLASH (or EEPROM).</p></li> |
| </ol> |
| <p><strong>Development Environments:</strong> 1) Linux with native Linux GNU toolchain, |
| 2) Cygwin/MSYS with Cygwin GNU toolchain, 3) Cygwin/MSYS with Windows |
| native toolchain, or 4) Native Windows. All testing, however, has been |
| performed using the NuttX DIY toolchain for Linux or Cygwin is provided |
| by the NuttX |
| <a class="reference external" href="https://bitbucket.org/nuttx/buildroot/downloads/">buildroot</a> |
| package. As a result, that toolchain is recommended.</p> |
| <section id="supported-boards"> |
| <h3>Supported Boards<a class="headerlink" href="#supported-boards" title="Permalink to this heading"></a></h3> |
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