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| <h2 id="sensor-listener-api">Sensor Listener API</h2> |
| <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>sensor_register_listener()</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>sensor_read()</code> function defined in the <a href="/os/modules/sensor_framework/sensor_api.md">sensor API</a> is called to read the sensor data for the specified sensor types from a sensor, the <code>sensor_read()</code> function calls the listener callback, passing it the sensor data that is read from the sensor. </p> |
| <p>An application calls the <code>sensor_unregister_listener()</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> |
| <h3 id="data-structures">Data Structures</h3> |
| <p>The <code>struct sensor_listener</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>sensor_register_listener()</code> function to register a listener.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">struct</span> <span style="color: #3F6E75">sensor_listener</span> { |
| { |
| <span style="color: #177500">/* The type of sensor data to listen for, this is interpreted as a</span> |
| <span style="color: #177500"> * mask, and this listener is called for all sensor types on this</span> |
| <span style="color: #177500"> * sensor that match the mask.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #000000">sensor_type_t</span> <span style="color: #000000">sl_sensor_type</span>; |
| |
| <span style="color: #177500">/* Sensor data handler function, called when has data */</span> |
| <span style="color: #000000">sensor_data_func_t</span> <span style="color: #000000">sl_func</span>; |
| |
| <span style="color: #177500">/* Argument for the sensor listener */</span> |
| <span style="color: #A90D91">void</span> <span style="color: #000000">*sl_arg</span>; |
| |
| <span style="color: #177500">/* Next item in the sensor listener list. The head of this list is</span> |
| <span style="color: #177500"> * contained within the sensor object.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #000000">SLIST_ENTRY</span>(<span style="color: #000000">sensor_listener</span>) <span style="color: #000000">sl_next</span>; |
| }; |
| </code></pre></div> |
| |
| <h3 id="list-of-functions">List of Functions:</h3> |
| <p>These are the functions defined by the sensor listener API. Please see the <a href="https://github.com/apache/mynewt-core/blob/master/hw/sensor/include/sensor/sensor.h">sensor.h</a> include file for details.</p> |
| <table> |
| <thead> |
| <tr> |
| <th>Function</th> |
| <th>Description</th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr> |
| <td>sensor_register_listener</td> |
| <td>Registers the specified listener for a given sensor.</td> |
| </tr> |
| <tr> |
| <td>sensor_unregister_listener</td> |
| <td>Unregisters the specified listener for a given sensor.</td> |
| </tr> |
| </tbody> |
| </table> |
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