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| <section id="cdcacm-usb-cdc-acm-device-commands"> |
| <h1><code class="docutils literal notranslate"><span class="pre">cdcacm</span></code> USB CDC/ACM Device Commands<a class="headerlink" href="#cdcacm-usb-cdc-acm-device-commands" title="Permalink to this heading"></a></h1> |
| <p>This very simple add-on allows the USB CDC/ACM serial device can be dynamically |
| connected and disconnected from a host. This add-on can only be used as an NSH |
| built-in command. If built-in, then two new NSH commands will be supported:</p> |
| <ol class="arabic simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">sercon</span></code> – Connect the CDC/ACM serial device</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">serdis</span></code> – Disconnect the CDC/ACM serial device</p></li> |
| </ol> |
| <p>Configuration prerequisites (not complete):</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_USBDEV=y</span></code> – USB device support must be enabled</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_CDCACM=y</span></code> – The CDC/ACM driver must be built</p></li> |
| </ul> |
| <p>Configuration options specific to this add-on:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_SYSTEM_CDCACM_DEVMINOR</span></code> – The minor number of the CDC/ACM device, |
| i.e., the <code class="docutils literal notranslate"><span class="pre">x</span></code> in <code class="docutils literal notranslate"><span class="pre">/dev/ttyACMx</span></code>.</p></li> |
| </ul> |
| <p>If <code class="docutils literal notranslate"><span class="pre">CONFIG_USBDEV_TRACE</span></code> is enabled (or <code class="docutils literal notranslate"><span class="pre">CONFIG_DEBUG_FEATURES</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">CONFIG_DEBUG_USB</span></code>, or <code class="docutils literal notranslate"><span class="pre">CONFIG_USBDEV_TRACE</span></code>), then the add-on code will also |
| initialize the USB trace output. The amount of trace output can be controlled |
| using:</p> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_SYSTEM_CDCACM_TRACEINIT</span></code> – Show initialization events.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_SYSTEM_CDCACM_TRACECLASS</span></code> – Show class driver events.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_SYSTEM_CDCACM_TRACETRANSFERS</span></code> – Show data transfer events.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_SYSTEM_CDCACM_TRACECONTROLLER</span></code> – Show controller events.</p></li> |
| <li><p><code class="docutils literal notranslate"><span class="pre">CONFIG_SYSTEM_CDCACM_TRACEINTERRUPTS</span></code> – Show interrupt-related events.</p></li> |
| </ul> |
| <p><strong>Note</strong>: This add-on is only enables or disable USB CDC/ACM via the NSH |
| <code class="docutils literal notranslate"><span class="pre">sercon</span></code> and <code class="docutils literal notranslate"><span class="pre">serdis</span></code> command. It will enable and disable tracing per the |
| settings before enabling and after disabling the CDC/ACM device. It will not, |
| however, monitor buffered trace data in the interim. If <code class="docutils literal notranslate"><span class="pre">CONFIG_USBDEV_TRACE</span></code> is |
| defined (and the debug options are not), other application logic will need to |
| monitor the buffered trace data.</p> |
| </section> |
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