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<h2 id="initialize-the-device-address">Initialize the Device Address</h2>
<p>The BLE specification requires that devices have an address (called a device address). This address can be either a public device address or a random device address. The current Nimble stack implementation requires that these addresses be defined somewhere in the application; they are not defined within the Nimble stack itself. This was done so that the entire application could have access to these addresses. We expect that we will move these addresses into the Nimble stack in a future release.</p>
<p>The two variables that must be defined are named <code>g_dev_addr</code> (public device address) and <code>g_random_addr</code> (static random address). The device address must be initialized prior to initializing the Nimble stack. The random address does not have to be initialized ahead of time as it is possible to set the random address in the Nimble controller when it is running. In this example, we only initialize the device address. The company OUI in this example is 0a:bb:cc; the unique portion is 11:22:33 for a device address equal to 0a:bb:cc:11:22:33. Note that we store the address in little endian order as BLE expects the OUI to be in the most significant bytes.</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="background-color: #ffffcc"><span style="color: #177500">/* Our global device address (public) */</span>
</span><span style="background-color: #ffffcc"><span style="color: #A90D91">uint8_t</span> <span style="color: #000000">g_dev_addr</span>[<span style="color: #000000">BLE_DEV_ADDR_LEN</span>];
</span><span style="background-color: #ffffcc">
</span><span style="background-color: #ffffcc"><span style="color: #177500">/* Our random address (static) */</span>
</span><span style="background-color: #ffffcc"><span style="color: #A90D91">uint8_t</span> <span style="color: #000000">g_random_addr</span>[<span style="color: #000000">BLE_DEV_ADDR_LEN</span>];
</span>
<span style="color: #A90D91">int</span>
<span style="color: #000000">main</span>(<span style="color: #A90D91">void</span>)
{
<span style="color: #A90D91">int</span> <span style="color: #000000">rc</span>;
<span style="color: #177500">/* Initialize OS */</span>
<span style="color: #000000">os_init</span>();
<span style="color: #177500">/* Set cputime to count at 1 usec increments */</span>
<span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">cputime_init</span>(<span style="color: #1C01CE">1000000</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: #177500">/* Create memory pool for Nimble packets and register with Msys */</span>
<span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mempool_init</span>(<span style="color: #000000">&amp;g_mbuf_mempool</span>, <span style="color: #000000">MBUF_NUM_MBUFS</span>,
<span style="color: #000000">MBUF_MEMBLOCK_SIZE</span>, <span style="color: #000000">&amp;g_mbuf_buffer</span>[<span style="color: #1C01CE">0</span>], <span style="color: #C41A16">&quot;mbuf_pool&quot;</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">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_mbuf_pool_init</span>(<span style="color: #000000">&amp;g_mbuf_pool</span>, <span style="color: #000000">&amp;g_mbuf_mempool</span>, <span style="color: #000000">MBUF_MEMBLOCK_SIZE</span>,
<span style="color: #000000">MBUF_NUM_MBUFS</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">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">os_msys_register</span>(<span style="color: #000000">&amp;g_mbuf_pool</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="background-color: #ffffcc"> <span style="color: #177500">/* Initialize our device address */</span>
</span><span style="background-color: #ffffcc"> <span style="color: #000000">g_dev_addr</span>[<span style="color: #1C01CE">0</span>] <span style="color: #000000">=</span> <span style="color: #1C01CE">0x33</span>;
</span><span style="background-color: #ffffcc"> <span style="color: #000000">g_dev_addr</span>[<span style="color: #1C01CE">1</span>] <span style="color: #000000">=</span> <span style="color: #1C01CE">0x22</span>;
</span><span style="background-color: #ffffcc"> <span style="color: #000000">g_dev_addr</span>[<span style="color: #1C01CE">2</span>] <span style="color: #000000">=</span> <span style="color: #1C01CE">0x11</span>;
</span><span style="background-color: #ffffcc"> <span style="color: #000000">g_dev_addr</span>[<span style="color: #1C01CE">3</span>] <span style="color: #000000">=</span> <span style="color: #1C01CE">0xcc</span>;
</span><span style="background-color: #ffffcc"> <span style="color: #000000">g_dev_addr</span>[<span style="color: #1C01CE">4</span>] <span style="color: #000000">=</span> <span style="color: #1C01CE">0xbb</span>;
</span><span style="background-color: #ffffcc"> <span style="color: #000000">g_dev_addr</span>[<span style="color: #1C01CE">5</span>] <span style="color: #000000">=</span> <span style="color: #1C01CE">0x0a</span>;
</span>
<span style="color: #177500">/* Start the OS */</span>
<span style="color: #000000">os_start</span>();
<span style="color: #177500">/* os start should never return. If it does, this should be an error */</span>
<span style="color: #000000">assert</span>(<span style="color: #1C01CE">0</span>);
}
</code></pre></div>
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