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| <div class="section" id="sensor-listener-api"> |
| <h1>Sensor Listener API<a class="headerlink" href="#sensor-listener-api" title="Permalink to this headline">¶</a></h1> |
| <p>The sensor listener API allows an application to register listeners for |
| sensors and get notified whenever sensor data are read from the sensor |
| devices. An application calls the <code class="docutils literal notranslate"><span class="pre">sensor_register_listener()</span></code> |
| function to register a listener that specifies the callback function and |
| the types of sensor data to listen for from a sensor device.</p> |
| <p>When the <code class="docutils literal notranslate"><span class="pre">sensor_read()</span></code> function defined in the <a class="reference external" href="/os/modules/sensor_framework/sensor_api.html">sensor |
| API</a> is called to read |
| the sensor data for the specified sensor types from a sensor, the |
| <code class="docutils literal notranslate"><span class="pre">sensor_read()</span></code> function calls the listener callback, passing it the |
| sensor data that is read from the sensor.</p> |
| <p>An application calls the <code class="docutils literal notranslate"><span class="pre">sensor_unregister_listener()</span></code> function to |
| unregister a listener if it no longer needs notifications when data is |
| read from a sensor.</p> |
| <p>An application can use listeners in conjunction with the sensor manager |
| poller. An application can configure a polling interval for a sensor and |
| register a listener for the sensor types it wants to listen for from the |
| sensor. When the sensor manager poller reads the sensor data from the |
| sensor at each polling interval, the listener callback is called with |
| the sensor data passed to it.</p> |
| <p>An application can also use listeners for other purposes. For example, |
| an application that uses the OIC sensor server may want to register |
| listeners. The OIC sensor server handles all the OIC requests for the |
| sensor resources and an application does not know about the OIC |
| requests. An application can install a listener if it wants to know |
| about a request for a sensor resource or use the sensor data that the |
| OIC sensor server reads from the sensor.</p> |
| <div class="section" id="data-structures"> |
| <h2>Data Structures<a class="headerlink" href="#data-structures" title="Permalink to this headline">¶</a></h2> |
| <p>The <code class="docutils literal notranslate"><span class="pre">struct</span> <span class="pre">sensor_listener</span></code> data structure represents a listener. You |
| must initialize a listener structure with a bit mask of the sensor types |
| to listen for from a sensor, a callback function that is called when |
| sensor data is read for one of the sensor types, and an opaque argument |
| to pass to the callback before you call the |
| <code class="docutils literal notranslate"><span class="pre">sensor_register_listener()</span></code> function to register a listener.</p> |
| <div class="highlight-c notranslate"><div class="highlight"><pre><span></span><span class="k">struct</span><span class="w"> </span><span class="nc">sensor_listener</span><span class="w"> </span><span class="p">{</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="cm">/* The type of sensor data to listen for, this is interpreted as a</span> |
| <span class="cm"> * mask, and this listener is called for all sensor types on this</span> |
| <span class="cm"> * sensor that match the mask.</span> |
| <span class="cm"> */</span> |
| <span class="w"> </span><span class="n">sensor_type_t</span><span class="w"> </span><span class="n">sl_sensor_type</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* Sensor data handler function, called when has data */</span> |
| <span class="w"> </span><span class="n">sensor_data_func_t</span><span class="w"> </span><span class="n">sl_func</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* Argument for the sensor listener */</span> |
| <span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="o">*</span><span class="n">sl_arg</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* Next item in the sensor listener list. The head of this list is</span> |
| <span class="cm"> * contained within the sensor object.</span> |
| <span class="cm"> */</span> |
| <span class="w"> </span><span class="n">SLIST_ENTRY</span><span class="p">(</span><span class="n">sensor_listener</span><span class="p">)</span><span class="w"> </span><span class="n">sl_next</span><span class="p">;</span> |
| <span class="p">};</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="list-of-functions"> |
| <h2>List of Functions:<a class="headerlink" href="#list-of-functions" title="Permalink to this headline">¶</a></h2> |
| <p>These are the functions defined by the sensor listener API. Please see |
| the |
| <a class="reference external" href="https://github.com/apache/mynewt-core/blob/master/hw/sensor/include/sensor/sensor.h">sensor.h</a> |
| include file for details.</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 43%" /> |
| <col style="width: 57%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Function</p></th> |
| <th class="head"><p>Description</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>sensor_re |
| gister_li |
| stener</p></td> |
| <td><p>Registers the |
| specified |
| listener for a |
| given sensor.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>sensor_un |
| register_ |
| listener</p></td> |
| <td><p>Unregisters |
| the specified |
| listener for a |
| given sensor.</p></td> |
| </tr> |
| </tbody> |
| </table> |
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