e>nb</code></a> crate)</p>
</li>
<li>
<p>Must be minimal, and thus easy to implement and zero cost, yet highly composable. People that
want higher level abstraction should <em>prefer to use this HAL</em> rather than <em>re-implement</em>
register manipulation code.</p>
</li>
<li>
<p>Serve as a foundation for building an ecosystem of platform agnostic drivers. Here driver
means a library crate that lets a target platform interface an external device like a digital
sensor or a wireless transceiver. The advant