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| <section id="boardctl-application-interface"> |
| <h1><code class="docutils literal notranslate"><span class="pre">boardctl()</span></code> Application Interface<a class="headerlink" href="#boardctl-application-interface" title="Permalink to this heading"></a></h1> |
| <dl class="c function"> |
| <dt class="sig sig-object c" id="c.boardctl"> |
| <span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="sig-name descname"><span class="n"><span class="pre">boardctl</span></span></span><span class="sig-paren">(</span><span class="kt"><span class="pre">unsigned</span></span><span class="w"> </span><span class="kt"><span class="pre">int</span></span><span class="w"> </span><span class="n"><span class="pre">cmd</span></span>, <span class="n"><span class="pre">uintptr_t</span></span><span class="w"> </span><span class="n"><span class="pre">arg</span></span><span class="sig-paren">)</span><a class="headerlink" href="#c.boardctl" title="Permalink to this definition"></a><br /></dt> |
| <dd><p>In a small embedded system, there will typically be a much |
| greater interaction between application and low-level board features. |
| The canonically correct to implement such interactions is by |
| implementing a character driver and performing the interactions |
| via low level ioctl() calls. This, however, may not be practical |
| in many cases and will lead to “correct” but awkward implementations.</p> |
| <p>boardctl() is non-standard OS interface to alleviate the problem. |
| It basically circumvents the normal device driver ioctl() |
| interlace and allows the application to perform direct |
| IOCTL-like calls to the board-specific logic. It is especially |
| useful for setting up board operational and test configurations.</p> |
| <p>NOTE: The other interfaces described in this document are internal |
| OS interface. boardctl() is an application interface to the OS. |
| There is no point, in fact, of using boardctl() within the OS; |
| the board interfaces prototyped in include/nuttx/board.h may |
| be called directly from within the OS.</p> |
| <p>Application interfaces are described in the NuttX User Guide. |
| This application interface interface is described here only |
| because it is so non-standard and because it is so closely |
| tied to board porting logic.</p> |
| <dl class="field-list simple"> |
| <dt class="field-odd">Parameters<span class="colon">:</span></dt> |
| <dd class="field-odd"><ul class="simple"> |
| <li><p><strong>cmd</strong> – Identifies the board command to be executed. See |
| <code class="docutils literal notranslate"><span class="pre">include/sys/boardctl.h</span></code> for the complete list of common |
| board commands. Provisions are made to support non-common, |
| board-specific commands as well.</p></li> |
| <li><p><strong>arg</strong> – The argument that accompanies the command. The nature |
| of the argument is determined by the specific command.</p></li> |
| </ul> |
| </dd> |
| <dt class="field-even">Returns<span class="colon">:</span></dt> |
| <dd class="field-even"><p>On success zero (OK) is returned; -1 (ERROR) is |
| returned on failure with the errno variable set to indicate the nature of the failure.</p> |
| </dd> |
| </dl> |
| </dd></dl> |
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