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<h2 id="initialize-the-nimble-controller">Initialize the NimBLE controller</h2>
<p>The NimBLE controller is initialized via a call to <code>ble_ll_init()</code>. This function is declared as follows:</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="color: #A90D91">int</span> <span style="color: #000000">ble_ll_init</span>(<span style="color: #A90D91">uint8_t</span> <span style="color: #000000">ll_task_prio</span>, <span style="color: #A90D91">uint8_t</span> <span style="color: #000000">num_acl_pkts</span>, <span style="color: #A90D91">uint16_t</span> <span style="color: #000000">acl_pkt_size</span>)
</code></pre></div>
<p>This function's parameters are documented below.</p>
<table>
<thead>
<tr>
<th><strong>Parameter</strong></th>
<th><strong>Description</strong></th>
</tr>
</thead>
<tbody>
<tr>
<td><em>prio</em></td>
<td>The priority of the NimBLE controller task. A lower number corresponds to higher priority.</td>
</tr>
<tr>
<td><em>num_acl_pkts</em></td>
<td>The maximum number of outstanding data packets that the controller will accept from the host.</td>
</tr>
<tr>
<td><em>acl_pkt_size</em></td>
<td>The maximum data packet size that the controller will accept from the host.</td>
</tr>
</tbody>
</table>
<p><strong>prio</strong>:</p>
<p>If you are not familiar with multitasking, preemptive operating systems we
highly encourage you to read the Core OS section of Mynewt OS manual. It is up
to the application developer to decide the priority of tasks in the system.
Note that the lower the priority number the higher the priority in the OS. For
example, if a task is running at priority 5 and a task at priority 3 wants to
run, the task at priority 5 gets preempted as the other task is a higher
proiority.</p>
<p>In the example shown below, the LL task is configured to have the highest
priority (priority 0). We recommend making the BLE LL task the highest priority
task in your application as it has fairly rigorous timing requirements and
allowing other tasks to preempt the LL task could cause undesirable behavior.
Note that we do not force this to be the case as an application may require a
task to be even higher priority than the LL task. Just be warned: a task
higher in priority than the LL task should not perform actions that take too
long; even a few milliseconds could cause undesirable behavior.</p>
<p><strong>num_acl_pkts</strong> and <strong>acl_pkt_size</strong>:</p>
<p>These two parameters are used to limit the amount of data the host tries to send through the controller. NimBLE uses the msys facility for allocating data packets, so the product of these arguments must not be larger than the total amount of memory allocated for msys. The below example uses some values that are reasonable for most uses.</p>
<div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code><span style="background-color: #ffffcc"><span style="color: #633820">#include</span> <span style="color: #177500">&quot;controller/ble_ll.h&quot;</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: #A90D91">struct</span> <span style="color: #3F6E75">ble_hs_cfg</span> <span style="color: #000000">cfg</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="color: #177500">/* Initialize our device address */</span>
<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 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 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 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 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 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 style="color: #177500">/* Initialize the statistics package */</span>
<span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">stats_module_init</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 the BLE LL */</span>
</span><span style="background-color: #ffffcc"> <span style="color: #000000">rc</span> <span style="color: #000000">=</span> <span style="color: #000000">ble_ll_init</span>(<span style="color: #1C01CE">0</span>, <span style="color: #1C01CE">7</span>, <span style="color: #1C01CE">260</span>);
</span><span style="background-color: #ffffcc"> <span style="color: #000000">assert</span>(<span style="color: #000000">rc</span> <span style="color: #000000">==</span> <span style="color: #1C01CE">0</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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