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| <div class="section" id="configure-device-address"> |
| <h1>Configure device address<a class="headerlink" href="#configure-device-address" title="Permalink to this headline">¶</a></h1> |
| <p>A BLE device needs an address to do just about anything. For information |
| on the various types of Bluetooth addresses, see the <cite>NimBLE Host |
| Identity Reference :doc:`<../ble_hs/ble_hs_id/ble_hs_id></cite>.</p> |
| <p>There are several methods for assigning an address to a NimBLE device. |
| The available options are documented below:</p> |
| <div class="section" id="method-1-configure-nrf-hardware-with-a-public-address"> |
| <h2>Method 1: Configure nRF hardware with a public address<a class="headerlink" href="#method-1-configure-nrf-hardware-with-a-public-address" title="Permalink to this headline">¶</a></h2> |
| <p>When Mynewt is running on a Nordic nRF platform, the NimBLE controller |
| will attempt to read a public address out of the board’s FICR or UICR |
| registers. The controller uses the following logic while trying to read |
| an address from hardware:</p> |
| <ol class="arabic simple"> |
| <li><p>If the <em>DEVICEADDRTYPE</em> FICR register is written, read the address |
| programmed in the <em>DEVICEADDR[0]</em> and <em>DEVICEADDR[1]</em> FICR registers.</p></li> |
| <li><p>Else if the upper 16 bits of the <em>CUSTOMER[1]</em> UICR register are 0, |
| read the address programmed in the <em>CUSTOMER[0]</em> and <em>CUSTOMER[1]</em> |
| UCI registers.</p></li> |
| <li><p>Else, no address available.</p></li> |
| </ol> |
| </div> |
| <div class="section" id="method-2-hardcode-a-public-address-in-the-mynewt-target"> |
| <h2>Method 2: Hardcode a public address in the Mynewt target<a class="headerlink" href="#method-2-hardcode-a-public-address-in-the-mynewt-target" title="Permalink to this headline">¶</a></h2> |
| <p>The NimBLE controller package exports a |
| <a class="reference internal" href="../../os/modules/sysinitconfig/sysinitconfig.html"><span class="doc">syscfg</span></a> setting |
| called <code class="docutils literal notranslate"><span class="pre">BLE_PUBLIC_DEV_ADDR</span></code>. This setting can be overridden at the |
| application or target level to configure a public Bluetooth address. For |
| example, a target can assign the public address <em>11:22:33:44:55:66</em> as |
| follows:</p> |
| <div class="highlight-none notranslate"><div class="highlight"><pre><span></span>syscfg.vals: |
| BLE_PUBLIC_DEV_ADDR: '(uint8_t[6]){0x66, 0x55, 0x44, 0x33, 0x22, 0x11}' |
| </pre></div> |
| </div> |
| <p>This setting takes the form of a C expression. Specifically, the value |
| is a designated initializer expressing a six-byte array. Also note that |
| the bytes are reversed, as an array is inherently little-endian, while |
| addresses are generally expressed in big-endian.</p> |
| <p>Note: this method takes precedence over method 1. Whatever is written to |
| the <code class="docutils literal notranslate"><span class="pre">BLE_PUBLIC_DEV_ADDR</span></code> setting is the address that gets used.</p> |
| </div> |
| <div class="section" id="method-3-configure-a-random-address-at-runtime"> |
| <h2>Method 3: Configure a random address at runtime<a class="headerlink" href="#method-3-configure-a-random-address-at-runtime" title="Permalink to this headline">¶</a></h2> |
| <p>Random addresses get configured through the NimBLE host. The following |
| two functions are used in random address configuration:</p> |
| <ul class="simple"> |
| <li><p><span class="xref std std-doc">ble_hs_id_gen_rnd</span>: |
| Generates a new random address.</p></li> |
| <li><p><span class="xref std std-doc">ble_hs_id_set_rnd</span>: |
| Sets the device’s random address.</p></li> |
| </ul> |
| <p>For an example of how this is done, see the <span class="xref std std-doc"><../../../os/tutorials/ibeacon></span>.</p> |
| <p><em>Note:</em> A NimBLE device can be configured with multiple addresses; at |
| most one of each address type.</p> |
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