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| <li class="toctree-l2"><a class="reference internal" href="../../binfmt.html">Binary Loader</a></li> |
| <li class="toctree-l2 current"><a class="reference internal" href="../index.html">Device Drivers</a><ul class="current"> |
| <li class="toctree-l3"><a class="reference internal" href="../character/index.html">Character Device Drivers</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="../block/index.html">Block Device Drivers</a></li> |
| <li class="toctree-l3 current"><a class="current reference internal" href="#">Specialized Device Drivers</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="audio.html">Audio Device Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="clk.html">Clock management (CLK)</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="devicetree.html">Device Tree support</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="devmem.html">DEVMEM Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="dma.html">DMA Drivers</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="i2c.html">I2C Device Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="ioexpander.html">IO Expander Device Drivers</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="mtd.html">Memory Technology Device Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="regmap.html">drivers/regmap</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="reset.html">Reset Driver</a></li> |
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| <li class="toctree-l4"><a class="reference internal" href="mmcsd.html">MMCSD Device Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="net/index.html">Network interface drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="pinctrl.html">Pinctrl Device Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="pipes.html">FIFO and named pipe drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="power/index.html">Power-related Drivers</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="virtio.html">Virtio Device Drivers</a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../index.html#subdirectories-of-nuttx-drivers">Subdirectories of <code class="docutils literal notranslate"><span class="pre">nuttx/drivers</span></code></a></li> |
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| <li class="toctree-l3"><a class="reference internal" href="../index.html#drivers-early-initialization">Drivers Early Initialization</a></li> |
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| <section id="specialized-device-drivers"> |
| <h1>Specialized Device Drivers<a class="headerlink" href="#specialized-device-drivers" title="Permalink to this heading"></a></h1> |
| <p>All device drivers that are accessible to application logic are |
| either: (1) Character device drivers that can be accessed via the |
| standard driver operations (<code class="docutils literal notranslate"><span class="pre">open()</span></code>, <code class="docutils literal notranslate"><span class="pre">close()</span></code>, <code class="docutils literal notranslate"><span class="pre">read()</span></code>, |
| <code class="docutils literal notranslate"><span class="pre">write()</span></code>, etc.), or (2) block drivers that can be accessing |
| only as part of mounting a file system or other special use cases |
| as described in the preceding paragraph.</p> |
| <p>In addition to this, there are also specialized “drivers” that can |
| be used only within the OS logic itself and are not accessible to |
| application logic. These specialized drivers are discussed in the |
| following section.</p> |
| <div class="admonition note"> |
| <p class="admonition-title">Note</p> |
| <p>While special drivers are <em>internal</em>, in some cases there are also |
| character/block drivers that sit on top of these special drivers |
| and thus expose them to applications.</p> |
| </div> |
| <div class="toctree-wrapper compound"> |
| <p class="caption" role="heading"><span class="caption-text">Supported Drivers</span></p> |
| <ul> |
| <li class="toctree-l1"><a class="reference internal" href="audio.html">Audio Device Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="clk.html">Clock management (CLK)</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="devicetree.html">Device Tree support</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="devmem.html">DEVMEM Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="dma.html">DMA Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="framebuffer.html">Frame Buffer Drivers</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="framebuffer.html#binding">Binding</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="framebuffer.html#generic-lcd-frame-buffer">Generic LCD Frame Buffer</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="framebuffer.html#vsync">VSYNC</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="framebuffer.html#vsync-offset">VSYNC Offset</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="framebuffer.html#examples">Examples</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="framebuffer.html#ttgo-t-display-esp32-board">TTGO T-Display ESP32 board</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="framebuffer.html#nuttx-simulator">NuttX Simulator</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="i2c.html">I2C Device Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="ioexpander.html">IO Expander Device Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="lcd.html">LCD Character Drivers</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="lcd.html#binding">Binding</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="lcd.html#generic-lcd-character-driver">Generic LCD Character Driver</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="lcd.html#supported-devices">Supported devices</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="lcd.html#lcds">LCDs</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="lcd.html#oleds">OLEDs</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="lcd.html#segment-lcds-slcds">Segment LCDS (SLCDs)</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="lcd.html#examples">Examples</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="lcd.html#ttgo-t-display-esp32-board">TTGO T-Display ESP32 board</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="lcd.html#nuttx-simulator">NuttX Simulator</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="lcd.html#lcd-header-files">LCD Header files</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="mtd.html">Memory Technology Device Drivers</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="mtd.html#eeprom">EEPROM</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="mtd.html#nand-memory">NAND MEMORY</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="mtd.html#files">Files</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="mtd.html#file-systems">File Systems</a><ul> |
| <li class="toctree-l4"><a class="reference internal" href="mtd.html#nxffs">NXFFS</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="mtd.html#fat">FAT</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="mtd.html#smart-fs">SMART FS</a></li> |
| <li class="toctree-l4"><a class="reference internal" href="mtd.html#what-is-needed">What is Needed</a></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="regmap.html">drivers/regmap</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="regmap.html#regmap-header-files">Regmap Header files</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="regmap.html#examples">Examples</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="reset.html">Reset Driver</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="rptun.html">Remote Proc Tunnel Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="rwbuffer.html"><code class="docutils literal notranslate"><span class="pre">rwbuffer.c</span></code></a></li> |
| <li class="toctree-l1"><a class="reference internal" href="sensors.html">Sensor Drivers</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#adxl345">ADXL345</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#adxl372">ADXL372</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#lsm330-spi">LSM330_SPI</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#mpl115a">MPL115A</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#common-sensor-register-interface">Common Sensor Register Interface</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#sensor-cluster-driver-interface">Sensor Cluster Driver Interface</a></li> |
| <li class="toctree-l2"><a class="reference internal" href="sensors.html#adt7320">ADT7320</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="segger.html">Segger RTT drivers</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="segger.html#segger-systemview">Segger SystemView</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l1"><a class="reference internal" href="spi.html">SPI Device Drivers</a></li> |
| <li class="toctree-l1"><a class="reference internal" href="syslog.html">SYSLOG</a><ul> |
| <li class="toctree-l2"><a class="reference internal" href="syslog.html#syslog-interfaces">SYSLOG Interfaces</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="syslog.html#standard-syslog-interfaces">Standard SYSLOG Interfaces</a></li> |
| <li class="toctree-l3"><a class="reference internal" href="syslog.html#debug-interfaces">Debug Interfaces</a></li> |
| </ul> |
| </li> |
| <li class="toctree-l2"><a class="reference internal" href="syslog.html#syslog-channels">SYSLOG Channels</a><ul> |
| <li class="toctree-l3"><a class="reference internal" href="syslog.html#syslog-channel-interfaces">SYSLOG Channel Interfaces</a></li> |
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