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| <h2 id="add-cputime">Add cputime</h2> |
| <p>The NimBLE stack requires "cputime". This is provided by the Mynewt HAL of the |
| same name. The cputime HAL provides a high resolution timer that is used by the |
| nimble stack (as the BLE specification requires a fairly high resolution timer |
| and has fairly tight timing requirements). The cputime HAL allows the user to |
| specify the timer resolution as different applications may require a different |
| resolution. While the Nimble stack does not require a specific timer resolution |
| per se, a resolution that is too large may affect performance and power |
| efficiency. A suggested clock rate for HAL cputime for the nimble stack is 1 |
| MHz, or 1 microsecond per cputime tick. This provides enough resolution for |
| most needs while providing the Nimble stack enough resolution to implement the |
| BLE specification.</p> |
| <p>Add the initialization of cputime to your application:</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">"hal/hal_cputime.h"</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="background-color: #ffffcc"> <span style="color: #177500">/* Set cputime to count at 1 usec increments */</span> |
| </span><span style="background-color: #ffffcc"> <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><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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