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| <div class="section" id="configure-clock-for-controller"> |
| <h1>Configure clock for controller<a class="headerlink" href="#configure-clock-for-controller" title="Permalink to this headline">¶</a></h1> |
| <p>The NimBLE stack uses OS cputime for scheduling various events inside |
| controller. Since the code of controller is optimized to work with 32768 |
| Hz clock, the OS cputime has to be configured accordingly.</p> |
| <p>To make things easier, controller package (<code class="docutils literal notranslate"><span class="pre">net/nimble/controller</span></code>) |
| defines new system configuration setting <code class="docutils literal notranslate"><span class="pre">BLE_LP_CLOCK</span></code> as sets it to |
| <code class="docutils literal notranslate"><span class="pre">1</span></code> so other packages can be configured if necessary. The next section |
| describes configuration required for controller to work properly.</p> |
| <div class="section" id="system-configuration"> |
| <h2>System configuration<a class="headerlink" href="#system-configuration" title="Permalink to this headline">¶</a></h2> |
| <p><strong>Note:</strong> All BSPs based on nRF5x have below settings automatically |
| applied when <code class="docutils literal notranslate"><span class="pre">BLE_LP_CLOCK</span></code> is set, there is no need to configure this |
| in application.</p> |
| <p>The following things need to be configured for NimBLE controller to work |
| properly:</p> |
| <ul class="simple"> |
| <li><p>OS cputime frequency shall be set to <code class="docutils literal notranslate"><span class="pre">32768</span></code></p></li> |
| <li><p>OS cputime timer source shall be set to 32768 Hz clock source</p></li> |
| <li><p>Default 1 MHz clock source can be disabled if not used by application</p></li> |
| <li><p>32768 Hz clock source shall be enabled</p></li> |
| <li><p>Crystal settling time shall be set to non-zero value (see below)</p></li> |
| </ul> |
| <p>For example, on nRF52 platform timer 5 can be used as source for 32768 |
| Hz clock. Also, timer 0 can be disabled since this is the default source |
| for OS cputime clock and is no longer used. The configuration will look |
| as below:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>syscfg.vals: |
| OS_CPUTIME_FREQ: 32768 |
| OS_CPUTIME_TIMER_NUM: 5 |
| TIMER_0: 0 |
| TIMER_5: 1 |
| BLE_XTAL_SETTLE_TIME: 1500 |
| </pre></div> |
| </div> |
| <p>On nRF51 platform the only difference is to use timer 3 instead of timer |
| 5.</p> |
| <p>On platforms without 32768 Hz crystal available it usually can be |
| synthesized by setting <code class="docutils literal notranslate"><span class="pre">XTAL_32768_SYNTH</span></code> to <code class="docutils literal notranslate"><span class="pre">1</span></code> - this is also |
| already configured in existing BSPs.</p> |
| </div> |
| <div class="section" id="crystal-settle-time-configuration"> |
| <h2>Crystal settle time configuration<a class="headerlink" href="#crystal-settle-time-configuration" title="Permalink to this headline">¶</a></h2> |
| <p>The configuration variable <code class="docutils literal notranslate"><span class="pre">BLE_XTAL_SETTLE_TIME</span></code> is used by the |
| controller to turn on the necessary clock source(s) for the radio and |
| associated peripherals prior to Bluetooth events (advertising, scanning, |
| connections, etc). For the nRF5x platforms, the HFXO needs to be turned |
| on prior to using the radio and the <code class="docutils literal notranslate"><span class="pre">BLE_XTAL_SETTLE_TIME</span></code> must be set |
| to accommodate this time. The amount of time required is board |
| dependent, so users must characterize their hardware and set |
| <code class="docutils literal notranslate"><span class="pre">BLE_XTAL_SETTLE_TIME</span></code> accordingly. The current value of 1500 |
| microseconds is a fairly long time and was intended to work for most, if |
| not all, platforms.</p> |
| <p>Note that changing this time will impact battery life with the amount |
| depending on the application. The HFXO draws a fairly large amount of |
| current when running so keeping this time as small as possible will |
| reduce overall current drain.</p> |
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