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| <div class="section" id="compile-time-configuration"> |
| <h1>Compile-Time Configuration<a class="headerlink" href="#compile-time-configuration" title="Permalink to this headline">¶</a></h1> |
| <div class="toctree-wrapper compound"> |
| </div> |
| <p>This guide describes how Mynewt manages system configuration. It shows |
| you how to tell Mynewt to use default or customized values to |
| configure packages that you develop or use to build a target. This |
| guide:</p> |
| <ul class="simple"> |
| <li><p>Assumes you have read the |
| <a class="reference internal" href="../../../concepts.html#concepts"><span class="std std-ref">Concepts</span></a> section that describes |
| the Mynewt package hierarchy and its use of the <code class="docutils literal notranslate"><span class="pre">pkg.yml</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> files.</p></li> |
| <li><p>Assumes you have read the Mynewt <a class="reference internal" href="../../../newt/newt_operation.html"><span class="doc">Theory of Operations</span></a> and are familiar with how newt |
| determines package dependencies for your target build.</p></li> |
| </ul> |
| <div class="contents local topic" id="contents"> |
| <ul class="simple"> |
| <li><p><a class="reference internal" href="#system-configuration-setting-definitions-and-values" id="id1">System Configuration Setting Definitions and Values</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#examples-of-configuration-settings" id="id2">Examples of Configuration Settings</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#example-1" id="id3">Example 1</a></p></li> |
| <li><p><a class="reference internal" href="#example-2" id="id4">Example 2</a></p></li> |
| <li><p><a class="reference internal" href="#example-3" id="id5">Example 3</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><p><a class="reference internal" href="#overriding-system-configuration-setting-values" id="id6">Overriding System Configuration Setting Values</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#resolving-override-conflicts" id="id7">Resolving Override Conflicts</a></p></li> |
| <li><p><a class="reference internal" href="#examples-of-overrides" id="id8">Examples of Overrides</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#example-4" id="id9">Example 4</a></p></li> |
| <li><p><a class="reference internal" href="#example-5" id="id10">Example 5</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><p><a class="reference internal" href="#conditional-settings" id="id11">Conditional Settings</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#examples-of-conditional-settings" id="id12">Examples of Conditional Settings</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#example-6" id="id13">Example 6</a></p></li> |
| <li><p><a class="reference internal" href="#example-7" id="id14">Example 7</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </li> |
| <li><p><a class="reference internal" href="#generated-syscfg-h-and-referencing-system-configuration-settings" id="id15">Generated syscfg.h and Referencing System Configuration Settings</a></p> |
| <ul> |
| <li><p><a class="reference internal" href="#example-of-syscfg-h-and-how-to-reference-a-setting-name" id="id16">Example of syscfg.h and How to Reference a Setting Name</a></p></li> |
| </ul> |
| </li> |
| </ul> |
| </div> |
| <p>Mynewt defines several configuration parameters in the <code class="docutils literal notranslate"><span class="pre">pkg.yml</span></code> and |
| <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> files. The newt tool uses this information to:</p> |
| <ul class="simple"> |
| <li><p>Generate a system configuration header file that contains all the |
| package configuration settings and values.</p></li> |
| <li><p>Display the system configuration settings and values in the |
| <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span> <span class="pre">config</span></code> command.</p></li> |
| </ul> |
| <p>The benefits with this approach include:</p> |
| <ul class="simple"> |
| <li><p>Allows Mynewt developers to reuse other packages and easily change |
| their configuration settings without updating source or header files |
| when implementing new packages.</p></li> |
| <li><p>Allows application developers to easily view the system configuration |
| settings and values and determine the values to override for a target |
| build.</p></li> |
| </ul> |
| <div class="section" id="system-configuration-setting-definitions-and-values"> |
| <h2><a class="toc-backref" href="#id1">System Configuration Setting Definitions and Values</a><a class="headerlink" href="#system-configuration-setting-definitions-and-values" title="Permalink to this headline">¶</a></h2> |
| <p>A package can optionally:</p> |
| <ul class="simple"> |
| <li><p>Define and expose the system configuration settings to allow other |
| packages to override the default setting values.</p></li> |
| <li><p>Override the system configuration setting values defined by the |
| packages that it depends on.</p></li> |
| </ul> |
| <p>You use the <code class="docutils literal notranslate"><span class="pre">defs</span></code> parameter in a <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file to define the |
| system configuration settings for a package. <code class="docutils literal notranslate"><span class="pre">defs</span></code> is a mapping (or |
| associative array) of system configuration setting definitions. It has |
| the following syntax:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.defs</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">PKGA_SYSCFG_NAME1</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">description</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">value</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">type</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">restrictions</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">PKGA_SYSCFG_NAME2</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">description</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">value</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">type</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">restrictions</span><span class="p">:</span> |
| </pre></div> |
| </div> |
| <p>Each setting definition consists of the following key-value mapping:</p> |
| <ul> |
| <li><p>A setting name for the key, such as <code class="docutils literal notranslate"><span class="pre">PKGA_SYSCFG_NAME1</span></code> in the |
| syntax example above. <strong>Note:</strong> A system configuration setting name |
| must be unique. The newt tool aborts the build when multiple packages |
| define the same setting.</p></li> |
| <li><p>A mapping of fields for the value. Each field itself is a key-value |
| pair of attributes. The field keys are <code class="docutils literal notranslate"><span class="pre">description</span></code>, <code class="docutils literal notranslate"><span class="pre">value</span></code>, |
| <code class="docutils literal notranslate"><span class="pre">type</span></code>, and <code class="docutils literal notranslate"><span class="pre">restrictions</span></code>. They are described in following |
| table:</p> |
| <table class="docutils align-default"> |
| <colgroup> |
| <col style="width: 13%" /> |
| <col style="width: 87%" /> |
| </colgroup> |
| <thead> |
| <tr class="row-odd"><th class="head"><p>Field</p></th> |
| <th class="head"><p>Description</p></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr class="row-even"><td><p>description</p></td> |
| <td><p>Describes the usage for the setting. This field is optional.</p></td> |
| </tr> |
| <tr class="row-odd"><td><p>value</p></td> |
| <td><p>Specifies the default value for the setting. This field is required. The |
| value depends on the type that you specify and can be an empty string.</p></td> |
| </tr> |
| <tr class="row-even"><td><p>type</p></td> |
| <td><p>Specifies the data type for the value field. This field is optional. You |
| can specify one of three types:</p> |
| <dl> |
| <dt><code class="docutils literal notranslate"><span class="pre">raw</span></code>:</dt><dd><p>The <code class="docutils literal notranslate"><span class="pre">value</span></code> data is uninterpreted. This is the default <code class="docutils literal notranslate"><span class="pre">type</span></code>.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">task_priority</span></code>:</dt><dd><p>Specifies a Mynewt task priority number. The task |
| priority number assigned to each setting must be unique and between 0 |
| and 239. value can be one of the following:</p> |
| <p>A number between 0 and 239 - The task priority number to use for the |
| setting.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">any</span></code> - Specify <code class="docutils literal notranslate"><span class="pre">any</span></code> to have newt automatically assign a priority for the |
| setting. |
| newt alphabetically orders all system configuration settings of this |
| type and assigns the next highest available task priority number to each |
| setting.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">flash_owner</span></code>:</dt><dd><p>Specifies a flash area. The value should be the name of a |
| flash area defined in the BSP flash map for your target board.</p> |
| </dd> |
| </dl> |
| </td> |
| </tr> |
| <tr class="row-odd"><td><p>restrictions</p></td> |
| <td><p>Specifies a list of restrictions on the setting value. <strong>This field is |
| optional</strong>. You can specify two formats:</p> |
| <dl class="simple"> |
| <dt><code class="docutils literal notranslate"><span class="pre">$notnull</span></code>:</dt><dd><p>Specifies that the setting cannot have the empty string for a |
| value. It essentially means that an empty string is not a sensible value |
| and a package must override it with an appropriate value.</p> |
| </dd> |
| <dt><code class="docutils literal notranslate"><span class="pre">expression</span></code>:</dt><dd><p>Specifies a boolean expression of the form |
| <code class="docutils literal notranslate"><span class="pre">[!]&ltrequired-setting>[if</span> <span class="pre">&ltbase-value>]</span></code></p> |
| </dd> |
| </dl> |
| <p>Examples:</p> |
| <p><code class="docutils literal notranslate"><span class="pre">restrictions:</span> <span class="pre">!LOG_FCB</span></code> - When this setting is enabled, <code class="docutils literal notranslate"><span class="pre">LOG_FCB</span></code> must be |
| disabled.</p> |
| <p><code class="docutils literal notranslate"><span class="pre">restrictions:</span> <span class="pre">LOG_FCB</span> <span class="pre">if</span> <span class="pre">0</span></code> - When this setting is disabled, <code class="docutils literal notranslate"><span class="pre">LOG_FCB</span></code> |
| must be enabled.</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| </li> |
| </ul> |
| <div class="section" id="examples-of-configuration-settings"> |
| <h3><a class="toc-backref" href="#id2">Examples of Configuration Settings</a><a class="headerlink" href="#examples-of-configuration-settings" title="Permalink to this headline">¶</a></h3> |
| <div class="section" id="example-1"> |
| <h4><a class="toc-backref" href="#id3">Example 1</a><a class="headerlink" href="#example-1" title="Permalink to this headline">¶</a></h4> |
| <p>The following example is an excerpt from the |
| <code class="docutils literal notranslate"><span class="pre">sys/log/full</span></code> package <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file. It defines the |
| <code class="docutils literal notranslate"><span class="pre">LOG_LEVEL</span></code> configuration setting to specify the log level and the |
| <code class="docutils literal notranslate"><span class="pre">LOG_NEWTMGR</span></code> configuration setting to specify whether to enable or |
| disable the newtmgr logging feature.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.defs</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">LOG_LEVEL</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">description</span><span class="p">:</span><span class="w"> </span><span class="s">'Log</span><span class="nv"> </span><span class="s">Level'</span> |
| <span class="w"> </span><span class="nt">value</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| <span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">raw</span> |
| |
| <span class="w"> </span><span class="w w-Error"> </span><span class="l l-Scalar l-Scalar-Plain">...</span> |
| |
| <span class="w"> </span><span class="nt">LOG_NEWTMGR</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">description</span><span class="p">:</span><span class="w"> </span><span class="s">'Enables</span><span class="nv"> </span><span class="s">or</span><span class="nv"> </span><span class="s">disables</span><span class="nv"> </span><span class="s">newtmgr</span><span class="nv"> </span><span class="s">command</span><span class="nv"> </span><span class="s">tool</span><span class="nv"> </span><span class="s">logging'</span> |
| <span class="w"> </span><span class="nt">value</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example-2"> |
| <h4><a class="toc-backref" href="#id4">Example 2</a><a class="headerlink" href="#example-2" title="Permalink to this headline">¶</a></h4> |
| <p>The following example is an excerpt from the |
| <code class="docutils literal notranslate"><span class="pre">net/nimble/controller</span></code> package <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file. It defines the |
| <code class="docutils literal notranslate"><span class="pre">BLE_LL_PRIO</span></code> configuration setting with a <code class="docutils literal notranslate"><span class="pre">task_priority</span></code> type and |
| assigns task priority 0 to the BLE link layer task.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.defs</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">BLE_LL_PRIO</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">description</span><span class="p">:</span><span class="w"> </span><span class="s">'BLE</span><span class="nv"> </span><span class="s">link</span><span class="nv"> </span><span class="s">layer</span><span class="nv"> </span><span class="s">task</span><span class="nv"> </span><span class="s">priority'</span> |
| <span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="s">'task_priority'</span> |
| <span class="w"> </span><span class="nt">value</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example-3"> |
| <h4><a class="toc-backref" href="#id5">Example 3</a><a class="headerlink" href="#example-3" title="Permalink to this headline">¶</a></h4> |
| <p>The following example is an excerpt from the <code class="docutils literal notranslate"><span class="pre">fs/nffs</span></code> |
| package <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.defs</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">NFFS_FLASH_AREA</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">description</span><span class="p">:</span><span class="w"> </span><span class="s">'The</span><span class="nv"> </span><span class="s">flash</span><span class="nv"> </span><span class="s">area</span><span class="nv"> </span><span class="s">to</span><span class="nv"> </span><span class="s">use</span><span class="nv"> </span><span class="s">for</span><span class="nv"> </span><span class="s">the</span><span class="nv"> </span><span class="s">Newtron</span><span class="nv"> </span><span class="s">Flash</span><span class="nv"> </span><span class="s">File</span><span class="nv"> </span><span class="s">System'</span> |
| <span class="w"> </span><span class="nt">type</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">flash_owner</span> |
| <span class="w"> </span><span class="nt">value</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">restrictions</span><span class="p">:</span> |
| <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">$notnull</span> |
| </pre></div> |
| </div> |
| <p>It defines the <code class="docutils literal notranslate"><span class="pre">NFFS_FLASH_AREA</span></code> configuration setting with a |
| <code class="docutils literal notranslate"><span class="pre">flash_owner</span></code> type indicating that a flash area needs to be specified |
| for the Newtron Flash File System. The flash areas are typically defined |
| by the BSP in its <code class="docutils literal notranslate"><span class="pre">bsp.yml</span></code> file. For example, the <code class="docutils literal notranslate"><span class="pre">bsp.yml</span></code> for |
| nrf52dk board (<code class="docutils literal notranslate"><span class="pre">hw/bsp/nrf52dk/bsp.yml</span></code>) defines an area named |
| <code class="docutils literal notranslate"><span class="pre">FLASH_AREA_NFFS</span></code>:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">FLASH_AREA_NFFS</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">user_id</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span> |
| <span class="w"> </span><span class="nt">device</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| <span class="w"> </span><span class="nt">offset</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0x0007d000</span> |
| <span class="w"> </span><span class="nt">size</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">12kB</span> |
| </pre></div> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file for the same board |
| (<code class="docutils literal notranslate"><span class="pre">hw/bsp/nrf52dk/syscfg.yml</span></code>) specifies that the above area be used |
| for <code class="docutils literal notranslate"><span class="pre">NFFS_FLASH_AREA</span></code>.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.vals</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">CONFIG_FCB_FLASH_AREA</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">FLASH_AREA_NFFS</span> |
| <span class="w"> </span><span class="nt">REBOOT_LOG_FLASH_AREA</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">FLASH_AREA_REBOOT_LOG</span> |
| <span class="w"> </span><span class="nt">NFFS_FLASH_AREA</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">FLASH_AREA_NFFS</span> |
| <span class="w"> </span><span class="nt">COREDUMP_FLASH_AREA</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">FLASH_AREA_IMAGE_1</span> |
| </pre></div> |
| </div> |
| <p>Note that the <code class="docutils literal notranslate"><span class="pre">fs/nffs/syscfg.yml</span></code> file indicates that the |
| <code class="docutils literal notranslate"><span class="pre">NFFS_FLASH_AREA</span></code> setting cannot be a null string; so a higher |
| priority package must set a non-null value to it. That is exactly what |
| the BSP package does. For more on priority of packages in setting |
| values, see the next section.</p> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="overriding-system-configuration-setting-values"> |
| <h2><a class="toc-backref" href="#id6">Overriding System Configuration Setting Values</a><a class="headerlink" href="#overriding-system-configuration-setting-values" title="Permalink to this headline">¶</a></h2> |
| <p>A package may use the <code class="docutils literal notranslate"><span class="pre">vals</span></code> parameter in its <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file to |
| override the configuration values defined by other packages. This |
| mechanism allows:</p> |
| <ul class="simple"> |
| <li><p>Mynewt developers to implement a package and easily override the |
| system configuration setting values that are defined by the packages |
| it depends on.</p></li> |
| <li><p>Application developers to easily and cleanly override default |
| configuration settings in a single place and build a customized |
| target. You can use the <code class="docutils literal notranslate"><span class="pre">newt</span> <span class="pre">target</span> <span class="pre">config</span> <span class="pre">show</span> <span class="pre"><target-name></span></code> |
| command to check all the system configuration setting definitions and |
| values in your target to determine the setting values to override. |
| See <a class="reference external" href="/newt/command_list/newt_target.html">newt target</a>.</p></li> |
| </ul> |
| <p><code class="docutils literal notranslate"><span class="pre">vals</span></code> specifies the mappings of system configuration setting |
| name-value pairs as follows:</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.vals</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">PKGA_SYSCFG_NAME1</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">VALUE1</span> |
| <span class="w"> </span><span class="nt">PKGA_SYSCFG_NAME2</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">VALUE2</span> |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span> |
| <span class="w"> </span><span class="nt">PKGN_SYSCFG_NAME1</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">VALUEN</span> |
| </pre></div> |
| </div> |
| <p><strong>Note</strong>: The newt tool ignores overrides of undefined system |
| configuration settings.</p> |
| <div class="section" id="resolving-override-conflicts"> |
| <h3><a class="toc-backref" href="#id7">Resolving Override Conflicts</a><a class="headerlink" href="#resolving-override-conflicts" title="Permalink to this headline">¶</a></h3> |
| <p>The newt tool uses package priorities to determine whether a package can |
| override a value and resolve conflicts when multiple packages override |
| the same system configuration setting. The following rules apply:</p> |
| <ul class="simple"> |
| <li><p>A package can only override the default values of system |
| configuration settings that are defined by lower priority packages.</p></li> |
| <li><p>When packages with different priorities override the same system |
| configuration setting value, newt uses the value from the highest |
| priority package.</p></li> |
| <li><p>Packages of equal priority cannot override the same system |
| configuration setting with different values. newt aborts the build |
| unless a higher priority package also overrides the value.</p></li> |
| </ul> |
| <p>The following package types are listed from highest to lowest priority:</p> |
| <ul class="simple"> |
| <li><p>Target</p></li> |
| <li><p>App</p></li> |
| <li><p>unittest - A target can include either an app or unit test package, |
| but not both.</p></li> |
| <li><p>BSP</p></li> |
| <li><p>Lib - Includes all other system level packages such as os, lib, sdk, |
| and compiler. (Note that a Lib package cannot override other Lib |
| package settings.)</p></li> |
| </ul> |
| <p>It is recommended that you override defaults at the target level instead |
| of updating individual package <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> files.</p> |
| </div> |
| <div class="section" id="examples-of-overrides"> |
| <h3><a class="toc-backref" href="#id8">Examples of Overrides</a><a class="headerlink" href="#examples-of-overrides" title="Permalink to this headline">¶</a></h3> |
| <div class="section" id="example-4"> |
| <h4><a class="toc-backref" href="#id9">Example 4</a><a class="headerlink" href="#example-4" title="Permalink to this headline">¶</a></h4> |
| <p>The following example is an excerpt from the |
| <code class="docutils literal notranslate"><span class="pre">apps/slinky</span></code> package <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file. The application package |
| overrides, in addition to other packages, the <code class="docutils literal notranslate"><span class="pre">sys/log/full</span></code> package |
| system configuration settings defined in <a class="reference internal" href="#example-1">Example 1</a>. It changes the |
| LOG_NEWTMGR system configuration setting value from <code class="docutils literal notranslate"><span class="pre">0</span></code> to <code class="docutils literal notranslate"><span class="pre">1</span></code>.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">syscfg.vals</span><span class="p">:</span> |
| <span class="w"> </span><span class="c1"># Enable the shell task.</span> |
| <span class="w"> </span><span class="nt">SHELL_TASK</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span> |
| |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span> |
| |
| <span class="w"> </span><span class="c1"># Enable newtmgr commands.</span> |
| <span class="w"> </span><span class="nt">STATS_NEWTMGR</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span> |
| <span class="w"> </span><span class="nt">LOG_NEWTMGR</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span> |
| </pre></div> |
| </div> |
| </div> |
| <div class="section" id="example-5"> |
| <h4><a class="toc-backref" href="#id10">Example 5</a><a class="headerlink" href="#example-5" title="Permalink to this headline">¶</a></h4> |
| <p>The following example are excerpts from the |
| <code class="docutils literal notranslate"><span class="pre">hw/bsp/native</span></code> package <code class="docutils literal notranslate"><span class="pre">bsp.yml</span></code> and <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> files. The |
| package defines the flash areas for the BSP flash map in the <code class="docutils literal notranslate"><span class="pre">bsp.yml</span></code> |
| file, and sets the <code class="docutils literal notranslate"><span class="pre">NFFS_FLASH_AREA</span></code> configuration setting value to |
| use the flash area named <code class="docutils literal notranslate"><span class="pre">FLASH_AREA_NFFS</span></code> in the <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> file.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">bsp.flash_map</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">areas</span><span class="p">:</span> |
| <span class="w"> </span><span class="c1"># System areas.</span> |
| <span class="w"> </span><span class="nt">FLASH_AREA_BOOTLOADER</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">device</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| <span class="w"> </span><span class="nt">offset</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0x00000000</span> |
| <span class="w"> </span><span class="nt">size</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">16kB</span> |
| |
| <span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">...</span> |
| |
| <span class="w"> </span><span class="c1"># User areas.</span> |
| <span class="w"> </span><span class="nt">FLASH_AREA_REBOOT_LOG</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">user_id</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| <span class="w"> </span><span class="nt">device</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| <span class="w"> </span><span class="nt">offset</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0x00004000</span> |
| <span class="w"> </span><span class="nt">size</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">16kB</span> |
| <span class="w"> </span><span class="nt">FLASH_AREA_NFFS</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">user_id</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">1</span> |
| <span class="w"> </span><span class="nt">device</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0</span> |
| <span class="w"> </span><span class="nt">offset</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">0x00008000</span> |
| <span class="w"> </span><span class="nt">size</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">32kB</span> |
| |
| |
| <span class="nt">syscfg.vals</span><span class="p">:</span> |
| <span class="w"> </span><span class="nt">NFFS_FLASH_AREA</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">FLASH_AREA_NFFS</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="conditional-settings"> |
| <h2><a class="toc-backref" href="#id11">Conditional Settings</a><a class="headerlink" href="#conditional-settings" title="Permalink to this headline">¶</a></h2> |
| <p>Setings in most Mynewt YAML files can be made conditional on syscfg |
| settings. For example, a package might depend on a second package |
| <em>only if a syscfg setting has a particular value</em>. The condition can |
| be the value of a single syscfg setting or an arbitrary expression |
| involving many settings.</p> |
| <div class="section" id="examples-of-conditional-settings"> |
| <h3><a class="toc-backref" href="#id12">Examples of Conditional Settings</a><a class="headerlink" href="#examples-of-conditional-settings" title="Permalink to this headline">¶</a></h3> |
| <div class="section" id="example-6"> |
| <h4><a class="toc-backref" href="#id13">Example 6</a><a class="headerlink" href="#example-6" title="Permalink to this headline">¶</a></h4> |
| <p>In this example, a package depends on <code class="docutils literal notranslate"><span class="pre">lib/pkg2</span></code> only if |
| <code class="docutils literal notranslate"><span class="pre">MY_SETTING</span></code> has a true value.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="nt">pkg.deps.MY_SETTING</span><span class="p">:</span> |
| <span class="w"> </span><span class="c1"># Only depend on pkg2 if MY_SETTING is true.</span> |
| <span class="w"> </span><span class="p p-Indicator">-</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">lib/pkg2</span> |
| </pre></div> |
| </div> |
| <p>A setting is “true” if it has a value other than 0 or the empty string. |
| Undefined settings are not true.</p> |
| </div> |
| <div class="section" id="example-7"> |
| <h4><a class="toc-backref" href="#id14">Example 7</a><a class="headerlink" href="#example-7" title="Permalink to this headline">¶</a></h4> |
| <p>In this example, a package overrides the setting <code class="docutils literal notranslate"><span class="pre">FOO</span></code> only if |
| <code class="docutils literal notranslate"><span class="pre">BAR</span></code> is greater than 5 and <code class="docutils literal notranslate"><span class="pre">BAZ</span></code> is not true.</p> |
| <div class="highlight-yaml notranslate"><div class="highlight"><pre><span></span><span class="l l-Scalar l-Scalar-Plain">syscfg.vals.'(BAR > 5 && !BAZ)</span><span class="p p-Indicator">:</span> |
| <span class="w"> </span><span class="c1"># Only override FOO if BAR is greater than 5 and BAZ is untrue.</span> |
| <span class="w"> </span><span class="nt">FOO</span><span class="p">:</span><span class="w"> </span><span class="l l-Scalar l-Scalar-Plain">35</span> |
| </pre></div> |
| </div> |
| </div> |
| </div> |
| </div> |
| <div class="section" id="generated-syscfg-h-and-referencing-system-configuration-settings"> |
| <h2><a class="toc-backref" href="#id15">Generated syscfg.h and Referencing System Configuration Settings</a><a class="headerlink" href="#generated-syscfg-h-and-referencing-system-configuration-settings" title="Permalink to this headline">¶</a></h2> |
| <p>The newt tool processes all the package <code class="docutils literal notranslate"><span class="pre">syscfg.yml</span></code> files and |
| generates the <code class="docutils literal notranslate"><span class="pre">bin/<target-path>/generated/include/syscfg/syscfg.h</span></code> |
| include file with <code class="docutils literal notranslate"><span class="pre">#define</span></code> statements for each system configuration |
| setting defined. Newt creates a <code class="docutils literal notranslate"><span class="pre">#define</span></code> for a setting name as |
| follows:</p> |
| <ul class="simple"> |
| <li><p>Adds the prefix <code class="docutils literal notranslate"><span class="pre">MYNEWT_VAL_</span></code>.</p></li> |
| <li><p>Replaces all occurrences of “/”, “-“, and ” ” in the setting name |
| with “_”.</p></li> |
| <li><p>Converts all characters to upper case.</p></li> |
| </ul> |
| <p>For example, the #define for my-config-name setting name is |
| MYNEWT_VAL_MY_CONFIG_NAME.</p> |
| <p>Newt groups the settings in <code class="docutils literal notranslate"><span class="pre">syscfg.h</span></code> by the packages that defined |
| them. It also indicates the package that changed a system configuration |
| setting value.</p> |
| <p>You must use the <code class="docutils literal notranslate"><span class="pre">MYNEWT_VAL()</span></code> macro to reference a #define of a |
| setting name in your header and source files. For example, to reference |
| the <code class="docutils literal notranslate"><span class="pre">my-config-name</span></code> setting name, you use |
| <code class="docutils literal notranslate"><span class="pre">MYNEWT_VAL(MY_CONFIG_NAME)</span></code>.</p> |
| <p><strong>Note:</strong> You only need to include <code class="docutils literal notranslate"><span class="pre">syscfg/syscfg.h</span></code> in your source |
| files to access the <code class="docutils literal notranslate"><span class="pre">syscfg.h</span></code> file. The newt tool sets the correct |
| include path to build your target.</p> |
| <div class="section" id="example-of-syscfg-h-and-how-to-reference-a-setting-name"> |
| <h3><a class="toc-backref" href="#id16">Example of syscfg.h and How to Reference a Setting Name</a><a class="headerlink" href="#example-of-syscfg-h-and-how-to-reference-a-setting-name" title="Permalink to this headline">¶</a></h3> |
| <p><strong>Example 6</strong>: The following example are excerpts from a sample |
| <code class="docutils literal notranslate"><span class="pre">syscfg.h</span></code> file generated for an app/slinky target and from the |
| <code class="docutils literal notranslate"><span class="pre">sys/log/full</span></code> package <code class="docutils literal notranslate"><span class="pre">log.c</span></code> file that shows how to reference a |
| setting name.</p> |
| <p>The <code class="docutils literal notranslate"><span class="pre">syscfg.h</span></code> file shows the <code class="docutils literal notranslate"><span class="pre">sys/log/full</span></code> package definitions and |
| also indicates that <code class="docutils literal notranslate"><span class="pre">app/slinky</span></code> changed the value for the |
| <code class="docutils literal notranslate"><span class="pre">LOG_NEWTMGR</span></code> settings.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="cm">/**</span> |
| <span class="cm"> * This file was generated by Apache Newt version: 1.0.0-dev</span> |
| <span class="cm"> */</span> |
| |
| <span class="cp">#ifndef H_MYNEWT_SYSCFG_</span> |
| <span class="cp">#define H_MYNEWT_SYSCFG_</span> |
| |
| <span class="cm">/**</span> |
| <span class="cm"> * This macro exists to ensure code includes this header when needed. If code</span> |
| <span class="cm"> * checks the existence of a setting directly via ifdef without including this</span> |
| <span class="cm"> * header, the setting macro will silently evaluate to 0. In contrast, an</span> |
| <span class="cm"> * attempt to use these macros without including this header will result in a</span> |
| <span class="cm"> * compiler error.</span> |
| <span class="cm"> */</span> |
| <span class="cp">#define MYNEWT_VAL(x) MYNEWT_VAL_ ## x</span> |
| |
| <span class="cm">/* ... */</span> |
| |
| <span class="cm">/*** kernel/os */</span> |
| <span class="cp">#ifndef MYNEWT_VAL_MSYS_1_BLOCK_COUNT</span> |
| <span class="cp">#define MYNEWT_VAL_MSYS_1_BLOCK_COUNT (12)</span> |
| <span class="cp">#endif</span> |
| |
| <span class="cp">#ifndef MYNEWT_VAL_MSYS_1_BLOCK_SIZE</span> |
| <span class="cp">#define MYNEWT_VAL_MSYS_1_BLOCK_SIZE (292)</span> |
| <span class="cp">#endif</span> |
| |
| <span class="cm">/* ... */</span> |
| |
| <span class="cm">/*** sys/log/full */</span> |
| |
| <span class="cp">#ifndef MYNEWT_VAL_LOG_LEVEL</span> |
| <span class="cp">#define MYNEWT_VAL_LOG_LEVEL (0)</span> |
| <span class="cp">#endif</span> |
| |
| <span class="cm">/* ... */</span> |
| |
| <span class="cm">/* Overridden by apps/slinky (defined by sys/log/full) */</span> |
| <span class="cp">#ifndef MYNEWT_VAL_LOG_NEWTMGR</span> |
| <span class="cp">#define MYNEWT_VAL_LOG_NEWTMGR (1)</span> |
| <span class="cp">#endif</span> |
| |
| <span class="cp">#endif</span> |
| </pre></div> |
| </div> |
| <p>The <code class="docutils literal notranslate"><span class="pre">log_init()</span></code> function in the <code class="docutils literal notranslate"><span class="pre">sys/log/full/src/log.c</span></code> file |
| initializes the <code class="docutils literal notranslate"><span class="pre">sys/log/full</span></code> package. It checks the <code class="docutils literal notranslate"><span class="pre">LOG_NEWTMGR</span></code> |
| setting value, using <code class="docutils literal notranslate"><span class="pre">MYNEWT_VAL(LOG_NEWTMGR)</span></code>, to determine whether |
| the target application has enabled the <code class="docutils literal notranslate"><span class="pre">newtmgr</span> <span class="pre">log</span></code> functionality. It |
| only registers the the callbacks to process the <code class="docutils literal notranslate"><span class="pre">newtmgr</span> <span class="pre">log</span></code> commands |
| when the setting value is non-zero.</p> |
| <div class="highlight-cpp notranslate"><div class="highlight"><pre><span></span><span class="kt">void</span> |
| <span class="nf">log_init</span><span class="p">(</span><span class="kt">void</span><span class="p">)</span> |
| <span class="p">{</span> |
| <span class="w"> </span><span class="kt">int</span><span class="w"> </span><span class="n">rc</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* Ensure this function only gets called by sysinit. */</span> |
| <span class="w"> </span><span class="n">SYSINIT_ASSERT_ACTIVE</span><span class="p">();</span> |
| |
| <span class="w"> </span><span class="p">(</span><span class="kt">void</span><span class="p">)</span><span class="n">rc</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">log_inited</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> |
| <span class="w"> </span><span class="k">return</span><span class="p">;</span> |
| <span class="w"> </span><span class="p">}</span> |
| <span class="w"> </span><span class="n">log_inited</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="mi">1</span><span class="p">;</span> |
| |
| <span class="w"> </span><span class="cm">/* ... */</span> |
| |
| <span class="cp">#if MYNEWT_VAL(LOG_NEWTMGR)</span> |
| <span class="w"> </span><span class="n">rc</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">log_nmgr_register_group</span><span class="p">();</span> |
| <span class="w"> </span><span class="n">SYSINIT_PANIC_ASSERT</span><span class="p">(</span><span class="n">rc</span><span class="w"> </span><span class="o">==</span><span class="w"> </span><span class="mi">0</span><span class="p">);</span> |
| <span class="cp">#endif</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| </div> |
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