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| <section id="spi-device-drivers"> |
| <h1>SPI Device Drivers<a class="headerlink" href="#spi-device-drivers" title="Permalink to this heading"></a></h1> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">include/nuttx/spi/spi.h</span></code>. All structures and APIs needed |
| to work with SPI drivers are provided in this header file.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">spi_ops_s</span></code>. Each SPI device driver must implement |
| an instance of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">spi_ops_s</span></code>. That structure defines a |
| call table with the following methods:</p></li> |
| <li><p><strong>Binding SPI Drivers</strong>. SPI drivers are not normally directly |
| accessed by user code, but are usually bound to another, higher |
| level device driver. See for example, |
| <code class="docutils literal notranslate"><span class="pre">int</span> <span class="pre">mmcsd_spislotinitialize(int</span> <span class="pre">minor,</span> <span class="pre">int</span> <span class="pre">slotno,</span> <span class="pre">FAR</span> <span class="pre">struct</span> <span class="pre">spi_dev_s</span> <span class="pre">*spi)</span></code> |
| in <code class="docutils literal notranslate"><span class="pre">drivers/mmcsd/mmcsd_spi.c</span></code>. In general, the binding |
| sequence is:</p> |
| <ol class="arabic simple"> |
| <li><p>Get an instance of <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">spi_dev_s</span></code> from the |
| hardware-specific SPI device driver, and</p></li> |
| <li><p>Provide that instance to the initialization method of the |
| higher level device driver.</p></li> |
| </ol> |
| </li> |
| <li><p><strong>Examples</strong>: <code class="docutils literal notranslate"><span class="pre">drivers/loop.c</span></code>, |
| <code class="docutils literal notranslate"><span class="pre">drivers/mmcsd/mmcsd_spi.c</span></code>, <code class="docutils literal notranslate"><span class="pre">drivers/ramdisk.c</span></code>, etc.</p></li> |
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