| <!DOCTYPE html> |
| <html lang="en"> |
| <head> |
| <meta charset="utf-8"> |
| <meta http-equiv="X-UA-Compatible" content="IE=edge"> |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> |
| |
| |
| <!-- This is broken by doc revisioning. |
| --> |
| <link rel="shortcut icon" href="../../../img/favicon.ico"> |
| |
| <title>BLE-enabled Air Quality Sensor - Apache Mynewt</title> |
| |
| <link href="../../../css/bootstrap-3.0.3.min.css" rel="stylesheet"> |
| <link rel="stylesheet" href="../../../css/highlight.css"> |
| <link href="../../../css/base.css" rel="stylesheet"> |
| <link href="../../../css/custom.css" rel="stylesheet"> |
| <link href="../../../css/v2.css" rel="stylesheet"> |
| <link href="https://fonts.googleapis.com/css?family=Lato" rel="stylesheet"> |
| <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.5.0/css/font-awesome.min.css"> |
| |
| <!-- HTML5 shim and Respond.js IE8 support of HTML5 elements and media queries --> |
| <!--[if lt IE 9]> |
| <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script> |
| <script src="https://oss.maxcdn.com/libs/respond.js/1.3.0/respond.min.js"></script> |
| <![endif]--> |
| |
| |
| <script> |
| (function(i, s, o, g, r, a, m) { |
| i["GoogleAnalyticsObject"] = r; |
| (i[r] = |
| i[r] || |
| function() { |
| (i[r].q = i[r].q || []).push(arguments); |
| }), |
| (i[r].l = 1 * new Date()); |
| (a = s.createElement(o)), (m = s.getElementsByTagName(o)[0]); |
| a.async = 1; |
| a.src = g; |
| m.parentNode.insertBefore(a, m); |
| })(window, document, "script", "//www.google-analytics.com/analytics.js", "ga"); |
| |
| ga("create", "UA-72162311-1", "auto"); |
| ga("send", "pageview"); |
| </script> |
| |
| </head> |
| |
| |
| <body class="BLE-enabled Air Quality Sensor"> |
| |
| |
| <div class="container"> |
| <div class="row v2-main-banner"> |
| <a class="logo-cell" href="/"> |
| <img class="logo" src="/img/logo.png"> |
| </a> |
| <div class="tagline-cell"> |
| <h4 class="tagline">An OS to build, deploy and securely manage billions of devices</h4> |
| </div> |
| <div class="news-cell"> |
| <div class="well"> |
| <h4>Latest News:</h4> <a href="/download">Apache Mynewt 1.11.0, Apache NimBLE 1.6.0 </a> released (September 7, 2023) |
| </div> |
| </div> |
| </div> |
| </div> |
| |
| |
| |
| |
| |
| |
| |
| |
| <nav id="navbar" class="navbar navbar-inverse affix-top" data-spy="affix" data-offset-top="150" role="navigation"> |
| <div class="container"> |
| <!-- Collapsed navigation --> |
| <div class="navbar-header"> |
| <!-- Expander button --> |
| <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse"> |
| <span class="sr-only">Toggle navigation</span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| <span class="icon-bar"></span> |
| </button> |
| |
| </div> |
| |
| <!-- Expanded navigation --> |
| <div class="navbar-collapse collapse"> |
| <!-- Main navigation --> |
| <ul class="nav navbar-nav navbar-right"> |
| <li |
| class="" |
| > |
| <a href="/"><i class="fa fa-home" style="font-size: larger;"></i></a> |
| </li> |
| <li |
| class="important" |
| > |
| <a href="/quick-start/">Quick Start</a> |
| </li> |
| <li |
| class="" |
| > |
| <a href="/about/">About</a> |
| </li> |
| <li |
| class="" |
| > |
| <a href="/talks/">Talks</a> |
| </li> |
| <li |
| class="active" |
| > |
| <a href="/documentation/">Documentation</a> |
| </li> |
| <li |
| class="" |
| > |
| <a href="/download/">Download</a> |
| </li> |
| <li |
| class="" |
| > |
| <a href="/community/">Community</a> |
| </li> |
| <li |
| class="" |
| > |
| <a href="/events/">Events</a> |
| </li> |
| </ul> |
| |
| </div> |
| </div> |
| </nav> |
| |
| |
| |
| <div class="container"> |
| |
| <div class="row"> |
| <div class="col-md-3 v2-sidebar sidebar-container"><div id="docSidebar" class="hidden-print" role="complementary"> |
| <div class="top"> |
| <div role="search"> |
| <form id="rtd-search-form" class="wy-form" action="../../../search.html" method="get"> |
| <div class="form-group"> |
| <input type="text" name="q" class="form-control" placeholder="Search documentation" /> |
| </div> |
| </form> |
| </div> |
| </div> |
| <ul class="toc-nav"> |
| <li class="doc-version"><select class="form-control" onchange="if (this.value) window.location.href=this.value"> |
| <option value="/latest"> |
| Version: master |
| </option> |
| <option value="/v1_11_0/" > |
| Version: 1.11.0 |
| </option> |
| <option value="/v1_10_0/" > |
| Version: 1.10.0 |
| </option> |
| <option value="/v1_9_0/" > |
| Version: 1.9.0 |
| </option> |
| <option value="/v1_8_0/" > |
| Version: 1.8.0 |
| </option> |
| <option value="/v1_7_0/" > |
| Version: 1.7.0 |
| </option> |
| <option value="/v1_6_0/" > |
| Version: 1.6.0 |
| </option> |
| <option value="/v1_5_0/" > |
| Version: 1.5.0 |
| </option> |
| <option value="/v1_4_0/" > |
| Version: 1.4.0 |
| </option> |
| <option value="/v1_3_0/os/introduction" > |
| Version: 1.3.0 |
| </option> |
| <option value="/v1_2_0/os/introduction" > |
| Version: 1.2.0 |
| </option> |
| <option value="/v1_1_0/os/introduction" selected="selected" > |
| Version: 1.1.0 |
| </option> |
| <option value="/v1_0_0/os/introduction" > |
| Version: 1.0.0 |
| </option> |
| <option value="/v0_9_0/os/introduction" > |
| Version: 0.9.0 |
| </option> |
| </select></li> |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../../introduction/">Mynewt Documentation</a> |
| |
| |
| <ul> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../../get_started/get_started/">Basic Setup</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| <li > |
| <a href="../../get_started/vocabulary/">Concepts</a> |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../tutorials/">Tutorials</a> |
| |
| |
| <ul> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../blinky/">Project Blinky</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../repo/add_repos/">Work with repositories</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../project-slinky/">Project Slinky for Remote Comms</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../ble_bare_bones/ |
| ">Bluetooth Low Energy</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../event_queue/ |
| ">OS Fundamentals</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../add_newtmgr/ |
| ">Remote Device Management</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| |
| |
| ../sensors/sensors/ |
| |
| ">Sensors</a> |
| |
| |
| <ul> |
| |
| |
| |
| |
| |
| <li ><a href="../sensors/sensors/">Sensor Framework</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../air_quality_sensor/ |
| ">Air-quality Sensor project</a> |
| |
| |
| <ul> |
| |
| |
| |
| <li > |
| <a href="../air_quality_sensor/">Basic Air Quality Sensor</a> |
| </li> |
| |
| |
| |
| |
| |
| <li class="active"> |
| <a href="./">BLE-enabled Air Quality Sensor</a> |
| </li> |
| |
| |
| |
| </ul> |
| |
| </li> |
| |
| |
| |
| |
| |
| <li > |
| <a href="../nrf52_adc/">Add an Analog Sensor</a> |
| </li> |
| |
| |
| |
| </ul> |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../segger_rtt/ |
| ">Tooling</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../codesize/ |
| ">Other</a> |
| |
| |
| </li> |
| |
| |
| |
| </ul> |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../../os_user_guide/">OS User Guide</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../../../network/ble/ble_intro/ |
| ">BLE User Guide</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../../../newt/newt_intro/">Newt Tool Guide</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li ><a href="../../../newtmgr/overview/">Newt Manager Guide</a> |
| |
| |
| </li> |
| |
| |
| |
| |
| |
| <li > |
| <a href="../../../known_issues/">Known Issues</a> |
| </li> |
| |
| |
| |
| </ul> |
| |
| </li> |
| |
| |
| |
| |
| |
| |
| |
| <li><a href=" |
| ../../../faq/go_env/ |
| ">Appendix</a> |
| |
| |
| </li> |
| |
| |
| |
| </ul> |
| </div></div> |
| |
| <div class="col-md-9" role="main"> |
| <div class="doc-header"> |
| <div role="navigation" aria-label="breadcrumbs navigation"> |
| <ul class="wy-breadcrumbs"> |
| <li><a href="/documentation/">Docs</a></li> |
| |
| |
| |
| <li>» <a href="os/tutorials/air_quality_sensor/">Air-quality Sensor project</a></li> |
| |
| |
| |
| <li>» Sensors</li> |
| |
| |
| |
| <li>» <a href="os/tutorials/tutorials/">Tutorials</a></li> |
| |
| |
| |
| <li>» <a href="os/introduction/">Mynewt Documentation</a></li> |
| |
| |
| |
| <li>» BLE-enabled Air Quality Sensor</li> |
| |
| |
| |
| <li class="wy-breadcrumbs-aside"> |
| |
| <a href="https://github.com/apache/mynewt-site/blob/master/docs/os/tutorials/air_quality_ble.md" |
| class="icon icon-github"> Edit on GitHub</a> |
| |
| </li> |
| |
| </ul> |
| </div> |
| </div> |
| |
| |
| |
| |
| |
| |
| |
| |
| <div class="alert alert-warning"> |
| <p> |
| Version 1.1.0 is not the most recent version of the Apache Mynewt |
| documentation. Click <a href="/latest">here</a> to read the latest |
| version. |
| </p> |
| </div> |
| |
| |
| |
| <h2 id="air-quality-sensor-project-via-bluetooth">Air quality sensor project via Bluetooth</h2> |
| <p>This is a follow-on project to the <a href="../air_quality_sensor/">Basic Air Quality Sensor</a> project; so it is |
| assumed that you have worked through that project and have your CO<sub>2</sub> sensor working properly with |
| your Arduino Primo board. </p> |
| <p>So let's get started making this thing Bluetooth enabled!</p> |
| <h3 id="add-bluetooth-gatt-services">Add Bluetooth GATT Services</h3> |
| <p>Since we already built the previous demo on the <a href="../bleprph/bleprph-app/">bluetooth peripheral</a> basic |
| app most of the bluetooth plumbing has already been taken care of for us. What's left is for us |
| to add the required GATT services for advertising the Carbon Dioxide sensor so that |
| other devices can get those values.</p> |
| <p>First, we'll define the GATT Services in <code>apps/air_quality/src/bleprph.h</code>.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/* Sensor Data */</span> |
| <span style="color: #177500">/* e761d2af-1c15-4fa7-af80-b5729002b340 */</span> |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #000000">ble_uuid128_t</span> <span style="color: #000000">gatt_svr_svc_co2_uuid</span> <span style="color: #000000">=</span> |
| <span style="color: #000000">BLE_UUID128_INIT</span>(<span style="color: #1C01CE">0x40</span>, <span style="color: #1C01CE">0xb3</span>, <span style="color: #1C01CE">0x20</span>, <span style="color: #1C01CE">0x90</span>, <span style="color: #1C01CE">0x72</span>, <span style="color: #1C01CE">0xb5</span>, <span style="color: #1C01CE">0x80</span>, <span style="color: #1C01CE">0xaf</span>, |
| <span style="color: #1C01CE">0xa7</span>, <span style="color: #1C01CE">0x4f</span>, <span style="color: #1C01CE">0x15</span>, <span style="color: #1C01CE">0x1c</span>, <span style="color: #1C01CE">0xaf</span>, <span style="color: #1C01CE">0xd2</span>, <span style="color: #1C01CE">0x61</span>, <span style="color: #1C01CE">0xe7</span>); |
| <span style="color: #633820">#define CO2_SNS_TYPE 0xDEAD</span> |
| <span style="color: #633820">#define CO2_SNS_STRING "SenseAir K30 CO2 Sensor"</span> |
| <span style="color: #633820">#define CO2_SNS_VAL 0xBEAD</span> |
| |
| <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">gatt_co2_val</span>; |
| </code></pre></div> |
| |
| <p>You can use any hex values you choose for the sensor type and sensor values, and you can |
| even forget the sensor type and sensor string definitions altogether but they make |
| the results look nice in our Bluetooth App for Mac OS X and iOS.</p> |
| <p>Next we'll add those services to <code>apps/air_quality/src/gatt_svr.c</code>.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">static</span> <span style="color: #A90D91">int</span> |
| <span style="color: #000000">gatt_svr_sns_access</span>(<span style="color: #A90D91">uint16_t</span> <span style="color: #000000">conn_handle</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">attr_handle</span>, |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gatt_access_ctxt</span> <span style="color: #000000">*ctxt</span>, |
| <span style="color: #A90D91">void</span> <span style="color: #000000">*arg</span>); |
| |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">gatt_co2_val_len</span>; |
| </code></pre></div> |
| |
| <p>Make sure it is added as <em>primary</em> service.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">static</span> <span style="color: #A90D91">const</span> <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gatt_svc_def</span> <span style="color: #000000">gatt_svr_svcs</span>[] <span style="color: #000000">=</span> { |
| { |
| <span style="color: #177500">/*** Service: Security test. */</span> |
| .<span style="color: #000000">type</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GATT_SVC_TYPE_PRIMARY</span>, |
| .<span style="color: #000000">uuid</span> <span style="color: #000000">=</span> <span style="color: #000000">&gatt_svr_svc_sec_test_uuid</span>.<span style="color: #000000">u</span>, |
| .<span style="color: #000000">characteristics</span> <span style="color: #000000">=</span> (<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gatt_chr_def</span>[]) { { |
| <span style="color: #177500">/*** Characteristic: Random number generator. */</span> |
| .<span style="color: #000000">uuid</span> <span style="color: #000000">=</span> <span style="color: #000000">&gatt_svr_chr_sec_test_rand_uuid</span>.<span style="color: #000000">u</span>, |
| .<span style="color: #000000">access_cb</span> <span style="color: #000000">=</span> <span style="color: #000000">gatt_svr_chr_access_sec_test</span>, |
| .<span style="color: #000000">flags</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GATT_CHR_F_READ</span> <span style="color: #000000">|</span> <span style="color: #000000">BLE_GATT_CHR_F_READ_ENC</span>, |
| }, { |
| <span style="color: #177500">/*** Characteristic: Static value. */</span> |
| .<span style="color: #000000">uuid</span> <span style="color: #000000">=</span> <span style="color: #000000">&gatt_svr_chr_sec_test_static_uuid</span>,.<span style="color: #000000">u</span> |
| .<span style="color: #000000">access_cb</span> <span style="color: #000000">=</span> <span style="color: #000000">gatt_svr_chr_access_sec_test</span>, |
| .<span style="color: #000000">flags</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GATT_CHR_F_READ</span> <span style="color: #000000">|</span> |
| <span style="color: #000000">BLE_GATT_CHR_F_WRITE</span> <span style="color: #000000">|</span> <span style="color: #000000">BLE_GATT_CHR_F_WRITE_ENC</span>, |
| }, { |
| <span style="color: #1C01CE">0</span>, <span style="color: #177500">/* No more characteristics in this service. */</span> |
| } }, |
| }, |
| { |
| <span style="color: #177500">/*** CO2 Level Notification Service. */</span> |
| .<span style="color: #000000">type</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GATT_SVC_TYPE_PRIMARY</span>, |
| .<span style="color: #000000">uuid</span> <span style="color: #000000">=</span> <span style="color: #000000">&gatt_svr_svc_co2_uuid</span>.<span style="color: #000000">u</span>, |
| .<span style="color: #000000">characteristics</span> <span style="color: #000000">=</span> (<span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gatt_chr_def</span>[]) { { |
| .<span style="color: #000000">uuid</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_UUID16_DECLARE</span>(<span style="color: #000000">CO2_SNS_TYPE</span>), |
| .<span style="color: #000000">access_cb</span> <span style="color: #000000">=</span> <span style="color: #000000">gatt_svr_sns_access</span>, |
| .<span style="color: #000000">flags</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GATT_CHR_F_READ</span>, |
| }, { |
| .<span style="color: #000000">uuid</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_UUID16_DECLARE</span>(<span style="color: #000000">CO2_SNS_VAL</span>), |
| .<span style="color: #000000">access_cb</span> <span style="color: #000000">=</span> <span style="color: #000000">gatt_svr_sns_access</span>, |
| .<span style="color: #000000">flags</span> <span style="color: #000000">=</span> <span style="color: #000000">BLE_GATT_CHR_F_NOTIFY</span>, |
| }, { |
| <span style="color: #1C01CE">0</span>, <span style="color: #177500">/* No more characteristics in this service. */</span> |
| } }, |
| }, |
| |
| { |
| <span style="color: #1C01CE">0</span>, <span style="color: #177500">/* No more services. */</span> |
| }, |
| }; |
| </code></pre></div> |
| |
| <p>Next we need to tell the GATT Server how to handle requests for CO<sub>2</sub> readings :</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #000000">sstatic</span> <span style="color: #A90D91">int</span> |
| <span style="color: #000000">gatt_svr_sns_access</span>(<span style="color: #A90D91">uint16_t</span> <span style="color: #000000">conn_handle</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">attr_handle</span>, |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">ble_gatt_access_ctxt</span> <span style="color: #000000">*ctxt</span>, |
| <span style="color: #A90D91">void</span> <span style="color: #000000">*arg</span>) |
| { |
| <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">uuid16</span>; |
| <span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>; |
| |
| <span style="color: #000000">uuid16</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_uuid_u16</span>(<span style="color: #000000">ctxt->chr->uuid</span>); |
| |
| <span style="color: #A90D91">switch</span> (<span style="color: #000000">uuid16</span>) { |
| <span style="color: #A90D91">case</span> <span style="color: #000000">CO2_SNS_TYPE</span>: |
| <span style="color: #000000">assert</span>(<span style="color: #000000">ctxt->op</span> <span style="color: #000000">==</span> <span style="color: #000000">BLE_GATT_ACCESS_OP_READ_CHR</span>); |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_append</span>(<span style="color: #000000">ctxt->om</span>, <span style="color: #000000">CO2_SNS_STRING</span>, <span style="color: #A90D91">sizeof</span> <span style="color: #000000">CO2_SNS_STRING</span>); |
| <span style="color: #000000">BLEPRPH_LOG</span>(<span style="color: #000000">INFO</span>, <span style="color: #C41A16">"CO2 SENSOR TYPE READ: %s\n"</span>, <span style="color: #000000">CO2_SNS_STRING</span>); |
| <span style="color: #A90D91">return</span> <span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span> <span style="color: #000000">?</span> <span style="color: #1C01CE">0</span> <span style="color: #000000">:</span> <span style="color: #000000">BLE_ATT_ERR_INSUFFICIENT_RES</span>; |
| |
| <span style="color: #A90D91">case</span> <span style="color: #000000">CO2_SNS_VAL</span>: |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">ctxt->op</span> <span style="color: #000000">==</span> <span style="color: #000000">BLE_GATT_ACCESS_OP_WRITE_CHR</span>) { |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">gatt_svr_chr_write</span>(<span style="color: #000000">ctxt->om</span>, <span style="color: #1C01CE">0</span>, |
| <span style="color: #A90D91">sizeof</span> <span style="color: #000000">gatt_co2_val</span>, |
| <span style="color: #000000">&gatt_co2_val</span>, |
| <span style="color: #000000">&gatt_co2_val_len</span>); |
| <span style="color: #A90D91">return</span> <span style="color: #000000">rc</span>; |
| } <span style="color: #A90D91">else</span> <span style="color: #A90D91">if</span> (<span style="color: #000000">ctxt->op</span> <span style="color: #000000">==</span> <span style="color: #000000">BLE_GATT_ACCESS_OP_READ_CHR</span>) { |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_append</span>(<span style="color: #000000">ctxt->om</span>, <span style="color: #000000">&gatt_co2_val</span>, |
| <span style="color: #A90D91">sizeof</span> <span style="color: #000000">gatt_co2_val</span>); |
| <span style="color: #A90D91">return</span> <span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span> <span style="color: #000000">?</span> <span style="color: #1C01CE">0</span> <span style="color: #000000">:</span> <span style="color: #000000">BLE_ATT_ERR_INSUFFICIENT_RES</span>; |
| } |
| |
| <span style="color: #A90D91">default</span><span style="color: #000000">:</span> |
| <span style="color: #000000">assert</span>(<span style="color: #1C01CE">0</span>); |
| <span style="color: #A90D91">return</span> <span style="color: #000000">BLE_ATT_ERR_UNLIKELY</span>; |
| } |
| } |
| </code></pre></div> |
| |
| <p>Now it's time to go into our <code>apps/air_quality/src/main.c</code> and change how we read CO<sub>2</sub> readings and |
| respond to requests. </p> |
| <p>We'll need a task handler with an event queue for the CO<sub>2</sub> readings -- they were handled by the shell task in the previous tutorial but now it needs to be replaced by a different handler as shown below.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/* CO2 Task settings */</span> |
| <span style="color: #633820">#define CO2_TASK_PRIO 5</span> |
| <span style="color: #633820">#define CO2_STACK_SIZE (OS_STACK_ALIGN(336))</span> |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">os_eventq</span> <span style="color: #000000">co2_evq</span>; |
| <span style="color: #A90D91">struct</span> <span style="color: #3F6E75">os_task</span> <span style="color: #000000">co2_task</span>; |
| <span style="color: #000000">bssnz_t</span> <span style="color: #000000">os_stack_t</span> <span style="color: #000000">co2_stack</span>[<span style="color: #000000">CO2_STACK_SIZE</span>]; |
| </code></pre></div> |
| |
| <p>And of course we'll need to go to our <code>main()</code> and do all the standard task and event setup we |
| normally do by adding the following. Again, remember to delete all the shell event queues and tasks.</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/* Initialize sensor eventq */</span> |
| <span style="color: #000000">os_eventq_init</span>(<span style="color: #000000">&co2_evq</span>); |
| |
| <span style="color: #177500">/* Create the CO2 reader task. </span> |
| <span style="color: #177500"> * All sensor reading operations are performed in this task.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #000000">os_task_init</span>(<span style="color: #000000">&co2_task</span>, <span style="color: #C41A16">"sensor"</span>, <span style="color: #000000">co2_task_handler</span>, |
| <span style="color: #A90D91">NULL</span>, <span style="color: #000000">CO2_TASK_PRIO</span>, <span style="color: #000000">OS_WAIT_FOREVER</span>, |
| <span style="color: #000000">co2_stack</span>, <span style="color: #000000">CO2_STACK_SIZE</span>); |
| </code></pre></div> |
| |
| <p>We'll also need to add a task handler -- since we initialized it above:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #177500">/**</span> |
| <span style="color: #177500"> * Event loop for the sensor task.</span> |
| <span style="color: #177500"> */</span> |
| <span style="color: #A90D91">static</span> <span style="color: #A90D91">void</span> |
| <span style="color: #000000">co2_task_handler</span>(<span style="color: #A90D91">void</span> <span style="color: #000000">*unused</span>) |
| { |
| <span style="color: #A90D91">while</span> (<span style="color: #1C01CE">1</span>) { |
| <span style="color: #000000">co2_read_event</span>(); |
| <span style="color: #177500">/* Wait 2 second */</span> |
| <span style="color: #000000">os_time_delay</span>(<span style="color: #000000">OS_TICKS_PER_SEC</span> <span style="color: #000000">*</span> <span style="color: #1C01CE">2</span>); |
| |
| } |
| } |
| </code></pre></div> |
| |
| <p>And finally, we'll take care of that <code>co2_read_event()</code> function:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> |
| <span style="color: #000000">co2_read_event</span>(<span style="color: #A90D91">void</span>) |
| { |
| <span style="color: #A90D91">int</span> <span style="color: #000000">value</span>; |
| <span style="color: #A90D91">enum</span> <span style="color: #000000">senseair_read_type</span> <span style="color: #000000">type</span> <span style="color: #000000">=</span> <span style="color: #000000">SENSEAIR_CO2</span>; |
| <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">chr_val_handle</span>; |
| <span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>; |
| |
| <span style="color: #000000">value</span> <span style="color: #000000">=</span> <span style="color: #000000">senseair_read</span>(<span style="color: #000000">type</span>); |
| <span style="color: #A90D91">if</span> (<span style="color: #000000">value</span> <span style="color: #000000">>=</span> <span style="color: #1C01CE">0</span>) { |
| <span style="color: #000000">console_printf</span>(<span style="color: #C41A16">"Got %d\n"</span>, <span style="color: #000000">value</span>); |
| } <span style="color: #A90D91">else</span> { |
| <span style="color: #000000">console_printf</span>(<span style="color: #C41A16">"Error while reading: %d\n"</span>, <span style="color: #000000">value</span>); |
| <span style="color: #A90D91">goto</span> <span style="color: #000000">err</span>; |
| } |
| <span style="color: #000000">gatt_co2_val</span> <span style="color: #000000">=</span> <span style="color: #000000">value</span>; |
| <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_gatts_find_chr</span>(<span style="color: #000000">&gatt_svr_svc_co2_uuid</span>.<span style="color: #000000">u</span>, <span style="color: #000000">BLE_UUID16_DECLARE</span>(<span style="color: #000000">CO2_SNS_VAL</span>), <span style="color: #A90D91">NULL</span>, <span style="color: #000000">&chr_val_handle</span>); |
| <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</span>); |
| <span style="color: #000000">ble_gatts_chr_updated</span>(<span style="color: #000000">chr_val_handle</span>); |
| <span style="color: #A90D91">return</span> (<span style="color: #1C01CE">0</span>); |
| <span style="color: #000000">err</span>: |
| <span style="color: #A90D91">return</span> (<span style="color: #000000">rc</span>); |
| } |
| </code></pre></div> |
| |
| <p>You'll notice that it looks eeirily similar to a portion of the shell event we created |
| earlier. This one simply reads and updates the CO<sub>2</sub> value and sends that over BLE to any |
| connected clients instead. </p> |
| <p>We can now build, create-image and load the app onto our Arduino Primo board, and then |
| connect and see the updated values! The image below shows the results using MyNewt Sensor Reader, |
| a Mac OS X app developed for connecting to MyNewt devices over Bluetooth but you can also use LightBlue |
| or any other application that can connect to, and read, Bluetooth data.</p> |
| <p><img alt="MyNewt Sensor Reader" src="../pics/MyNewtSensorReader.jpg" /></p> |
| <p>Congratulations!!</p> |
| |
| <div class="row"> |
| |
| |
| |
| |
| <ul class="nav nav-pills" style="margin-bottom: 10px"> |
| <li> |
| |
| </li> |
| <li class="pull-right"> |
| |
| </li> |
| </ul> |
| </div> |
| <footer class="row"> |
| <div class="col-xs-12"> |
| |
| <p class="copyright">Apache Mynewt is available under Apache License, version 2.0.</p> |
| |
| </div> |
| <div class="col-xs-12"> |
| <div class="logos"> |
| <a href="https://www.apache.org/"> |
| <img src="/img/asf_logo_wide_small.png" alt="Apache" title="Apache"> |
| </a> |
| <p> |
| Copyright © 2015-2021 The Apache Software Foundation.<br> |
| <small class="footnote"> |
| Apache Mynewt, Mynewt, Apache, the Apache feather logo, and the Apache Mynewt |
| project logo are either registered trademarks or trademarks of the Apache |
| Software Foundation in the United States and other countries. |
| </small> |
| </p> |
| <a href=""> |
| <img src="https://www.countit.com/images/add_to_slack.png" alt="Slack Icon" title="Join our Slack Community" /> |
| </a> |
| </div> |
| </div> |
| <a href="https://www.apache.org/licenses/"> |
| <button class="button-footer-asf"> |
| License |
| </button> |
| </a> |
| <a href="https://www.apache.org/foundation/sponsorship.html"> |
| <button class="button-footer-asf"> |
| Sponsorship |
| </button> |
| </a> |
| <a href="https://www.apache.org/foundation/thanks.html"> |
| <button class="button-footer-asf"> |
| Thanks |
| </button> |
| </a> |
| <a href="https://www.apache.org/security/"> |
| <button class="button-footer-asf"> |
| Security |
| </button> |
| </a> |
| <a href="https://apache.org/events/current-event"> |
| <button class="button-footer-asf"> |
| ASF Events |
| </button> |
| </a> |
| </footer> |
| </div> |
| </div> |
| |
| |
| </div> |
| |
| <script src="../../../js/jquery-1.10.2.min.js"></script> |
| <script src="../../../js/bootstrap-3.0.3.min.js"></script> |
| <script src="../../../js/highlight.pack.js"></script> |
| <script src="../../../js/base.js"></script> |
| <script src="../../../js/custom.js"></script> |
| <script src="search/main.js"></script> |
| |
| </body> |
| </html> |