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| <h1 id="hardware-abstraction-layer">Hardware Abstraction Layer</h1> |
| <h3 id="description">Description</h3> |
| <p>The Hardware Abstraction Layer (HAL) includes a set of APIs |
| (Application Programmer Interface) to connect to |
| the underlying hardware components including MCU components and peripheral |
| components.</p> |
| <p>The goal is to allow libraries, modules and applications written for Mynewt to |
| be shared within the Mynewt community and used across the variety of supported |
| Mynewt platforms. A secondary goal is to provide a simple consistent API |
| to commonly used MCU components and peripherals to make development easier. |
| Nothing in the HAL precludes the user of the underlying physical devices, |
| it only limits the portability of the end application.</p> |
| <h3 id="example">Example</h3> |
| <p>A Mynewt contributor might write a light-switch |
| module (<code>libs/light</code>) that provides the functionality of an intelligent light |
| switch. This might involve using a timer, a General Purpose Output (GPO) |
| to set the light to the on or off state, and flash memory to log the times the |
| lights were turned on or off. The contributor would like this module to |
| work with as many different hardware platforms as possible, but can't |
| possibly test across the complete set of hardware supported by Mynewt.</p> |
| <p><strong>Solution</strong>: The contributor uses the HAL APIs to control the peripherals. |
| The Mynewt team ensures that the underlying HAL devices all work equivalently |
| through the HAL APIs. The contributors library is independent of the specifics |
| of the hardware. </p> |
| <h3 id="dependency">Dependency</h3> |
| <p>To include the HAL within your project, simply add it to your package |
| dependencies as follows:</p> |
| <div class="codehilite" style="background: #ffffff"><pre style="line-height: 125%;"><span></span><code>pkg.deps: |
| . . . |
| hw/hal |
| </code></pre></div> |
| |
| <h3 id="platform-support">Platform Support</h3> |
| <p>Not all platforms (MCU and BSP) support all HAL devices. Consult your MCU |
| or BSP documentation to find out if you have hardware support for the |
| peripherals you are interested in using. Once you verify support, then |
| consult the MCU implementation and see if the specific HAL interface you are |
| using is in the <code>mcu/xxx/src/hal_xxxx.c</code> implementation. Finally, you |
| can build your project and ensure that there are no unresolved hal_xxx |
| externals.</p> |
| <h3 id="hal-architecture">HAL Architecture</h3> |
| <p>Visit the <a href="../hal_architecture/">HAL architecture</a> page to get a understanding |
| of our current hal and its evolution.</p> |
| <h3 id="implementing-hal-interfaces">Implementing HAL Interfaces</h3> |
| <p>It might be that a specific HAL interface is not supported on your MCU or |
| platform. See the specific HAL documentation for that interface for tips |
| on implementing this for your MCU.</p> |
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