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| <h2 id="configure-clock-for-controller">Configure clock for controller</h2> |
| <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>net/nimble/controller</code>) defines new |
| system configuration setting <code>BLE_LP_CLOCK</code> as sets it to <code>1</code> so other packages |
| can be configured if necessary. The next section describes configuration required |
| for controller to work properly.</p> |
| <h3 id="system-configuration">System configuration</h3> |
| <p><strong>Note:</strong> All BSPs based on nRF5x have below settings automatically applied when |
| <code>BLE_LP_CLOCK</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> |
| <li>OS cputime frequency shall be set to <code>32768</code></li> |
| <li>OS cputime timer source shall be set to 32768 Hz clock source</li> |
| <li>Default 1 MHz clock source can be disabled if not used by application</li> |
| <li>32768 Hz clock source shall be enabled</li> |
| <li>Crystal settling time shall be set to non-zero value (see <a href="#crystal-settle-time-configuration">below</a>)</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="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>syscfg.vals: |
| OS_CPUTIME_FREQ: 32768 |
| OS_CPUTIME_TIMER_NUM: 5 |
| TIMER_0: 0 |
| TIMER_5: 1 |
| BLE_XTAL_SETTLE_TIME: 1500 |
| </code></pre></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>XTAL_32768_SYNTH</code> to <code>1</code> - this is also already configured in existing |
| BSPs.</p> |
| <h3 id="crystal-settle-time-configuration">Crystal settle time configuration</h3> |
| <p>The configuration variable <code>BLE_XTAL_SETTLE_TIME</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>BLE_XTAL_SETTLE_TIME</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>BLE_XTAL_SETTLE_TIME</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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