avr-atomic 1.0.0

Fast atomic load/store without IRQ-disable for AVR
Documentation 
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<header id="title-block-header">
<h1 class="title">README</h1>
</header>
<h1 id="fast-atomic-loadstore-without-irq-disable-for-avr">Fast atomic
load/store without IRQ-disable for AVR</h1>
<p>A fast atomic type for 8-bit values on AVR microcontrollers. It is
designed to be efficient by avoiding IRQ-disable/restore overhead.</p>
<p>This crate provides a simple and fast way to perform atomic load and
store operations on 8-bit values: <code>u8</code>, <code>i8</code>,
<code>bool</code> and any other user defined type that can be converted
to and from <code>u8</code>.</p>
<h2 id="usage">Usage</h2>
<p>Add this to your <code>Cargo.toml</code>:</p>
<div class="sourceCode" id="cb1"><pre
class="sourceCode toml"><code class="sourceCode toml"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="kw">[dependencies]</span></span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a><span class="dt">avr-atomic</span> <span class="op">=</span> <span class="st">&quot;1&quot;</span></span></code></pre></div>
<h2 id="example-basic-types-u8-i8-bool">Example: Basic types u8, i8,
bool</h2>
<div class="sourceCode" id="cb2"><pre
class="sourceCode rust"><code class="sourceCode rust"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="kw">use</span> <span class="pp">avr_atomic::</span>AvrAtomic<span class="op">;</span></span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-3"><a href="#cb2-3" aria-hidden="true" tabindex="-1"></a><span class="kw">static</span> VALUE_U8<span class="op">:</span> AvrAtomic<span class="op">&lt;</span><span class="dt">u8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="pp">AvrAtomic::</span>new()<span class="op">;</span></span>
<span id="cb2-4"><a href="#cb2-4" aria-hidden="true" tabindex="-1"></a><span class="kw">static</span> VALUE_I8<span class="op">:</span> AvrAtomic<span class="op">&lt;</span><span class="dt">i8</span><span class="op">&gt;</span> <span class="op">=</span> <span class="pp">AvrAtomic::</span>new()<span class="op">;</span></span>
<span id="cb2-5"><a href="#cb2-5" aria-hidden="true" tabindex="-1"></a><span class="kw">static</span> VALUE_BOOL<span class="op">:</span> AvrAtomic<span class="op">&lt;</span><span class="dt">bool</span><span class="op">&gt;</span> <span class="op">=</span> <span class="pp">AvrAtomic::</span>new()<span class="op">;</span></span>
<span id="cb2-6"><a href="#cb2-6" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-7"><a href="#cb2-7" aria-hidden="true" tabindex="-1"></a><span class="kw">fn</span> foo() <span class="op">{</span></span>
<span id="cb2-8"><a href="#cb2-8" aria-hidden="true" tabindex="-1"></a>    VALUE_U8<span class="op">.</span>store(<span class="dv">0x42</span>)<span class="op">;</span></span>
<span id="cb2-9"><a href="#cb2-9" aria-hidden="true" tabindex="-1"></a>    <span class="kw">let</span> value <span class="op">=</span> VALUE_U8<span class="op">.</span>load()<span class="op">;</span></span>
<span id="cb2-10"><a href="#cb2-10" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-11"><a href="#cb2-11" aria-hidden="true" tabindex="-1"></a>    VALUE_I8<span class="op">.</span>store(<span class="op">-</span><span class="dv">42</span>)<span class="op">;</span></span>
<span id="cb2-12"><a href="#cb2-12" aria-hidden="true" tabindex="-1"></a>    <span class="kw">let</span> value <span class="op">=</span> VALUE_I8<span class="op">.</span>load()<span class="op">;</span></span>
<span id="cb2-13"><a href="#cb2-13" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb2-14"><a href="#cb2-14" aria-hidden="true" tabindex="-1"></a>    VALUE_BOOL<span class="op">.</span>store(<span class="cn">true</span>)<span class="op">;</span></span>
<span id="cb2-15"><a href="#cb2-15" aria-hidden="true" tabindex="-1"></a>    <span class="kw">let</span> value <span class="op">=</span> VALUE_BOOL<span class="op">.</span>load()<span class="op">;</span></span>
<span id="cb2-16"><a href="#cb2-16" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h2 id="example-user-defined-type">Example: User defined type</h2>
<div class="sourceCode" id="cb3"><pre
class="sourceCode rust"><code class="sourceCode rust"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="kw">use</span> <span class="pp">avr_atomic::</span><span class="op">{</span>AvrAtomic<span class="op">,</span> AvrAtomicConvert<span class="op">};</span></span>
<span id="cb3-2"><a href="#cb3-2" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-3"><a href="#cb3-3" aria-hidden="true" tabindex="-1"></a><span class="at">#[</span>derive<span class="at">(</span><span class="bu">Copy</span><span class="op">,</span> <span class="bu">Clone</span><span class="at">)]</span></span>
<span id="cb3-4"><a href="#cb3-4" aria-hidden="true" tabindex="-1"></a><span class="kw">struct</span> MyFoo <span class="op">{</span></span>
<span id="cb3-5"><a href="#cb3-5" aria-hidden="true" tabindex="-1"></a>    inner<span class="op">:</span> <span class="dt">u8</span><span class="op">,</span></span>
<span id="cb3-6"><a href="#cb3-6" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
<span id="cb3-7"><a href="#cb3-7" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-8"><a href="#cb3-8" aria-hidden="true" tabindex="-1"></a><span class="kw">impl</span> AvrAtomicConvert <span class="cf">for</span> MyFoo <span class="op">{</span></span>
<span id="cb3-9"><a href="#cb3-9" aria-hidden="true" tabindex="-1"></a>    <span class="kw">fn</span> from_u8(value<span class="op">:</span> <span class="dt">u8</span>) <span class="op">-&gt;</span> <span class="dt">Self</span> <span class="op">{</span></span>
<span id="cb3-10"><a href="#cb3-10" aria-hidden="true" tabindex="-1"></a>        <span class="dt">Self</span> <span class="op">{</span> inner<span class="op">:</span> value <span class="op">}</span></span>
<span id="cb3-11"><a href="#cb3-11" aria-hidden="true" tabindex="-1"></a>    <span class="op">}</span></span>
<span id="cb3-12"><a href="#cb3-12" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-13"><a href="#cb3-13" aria-hidden="true" tabindex="-1"></a>    <span class="kw">fn</span> to_u8(<span class="kw">self</span>) <span class="op">-&gt;</span> <span class="dt">u8</span> <span class="op">{</span></span>
<span id="cb3-14"><a href="#cb3-14" aria-hidden="true" tabindex="-1"></a>        <span class="kw">self</span><span class="op">.</span>inner</span>
<span id="cb3-15"><a href="#cb3-15" aria-hidden="true" tabindex="-1"></a>    <span class="op">}</span></span>
<span id="cb3-16"><a href="#cb3-16" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span>
<span id="cb3-17"><a href="#cb3-17" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-18"><a href="#cb3-18" aria-hidden="true" tabindex="-1"></a><span class="kw">static</span> VALUE<span class="op">:</span> AvrAtomic<span class="op">&lt;</span>MyFoo<span class="op">&gt;</span> <span class="op">=</span> <span class="pp">AvrAtomic::</span>new()<span class="op">;</span></span>
<span id="cb3-19"><a href="#cb3-19" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-20"><a href="#cb3-20" aria-hidden="true" tabindex="-1"></a><span class="kw">fn</span> foo() <span class="op">{</span></span>
<span id="cb3-21"><a href="#cb3-21" aria-hidden="true" tabindex="-1"></a>    VALUE<span class="op">.</span>store(MyFoo <span class="op">{</span> inner<span class="op">:</span> <span class="dv">2</span> <span class="op">}</span> )<span class="op">;</span></span>
<span id="cb3-22"><a href="#cb3-22" aria-hidden="true" tabindex="-1"></a></span>
<span id="cb3-23"><a href="#cb3-23" aria-hidden="true" tabindex="-1"></a>    <span class="kw">let</span> value <span class="op">=</span> VALUE<span class="op">.</span>load()<span class="op">;</span></span>
<span id="cb3-24"><a href="#cb3-24" aria-hidden="true" tabindex="-1"></a>    <span class="pp">assert_eq!</span>(value<span class="op">.</span>inner<span class="op">,</span> <span class="dv">2</span>)<span class="op">;</span></span>
<span id="cb3-25"><a href="#cb3-25" aria-hidden="true" tabindex="-1"></a><span class="op">}</span></span></code></pre></div>
<h2 id="license">License</h2>
<p>This project is licensed under either of the following, at your
option:</p>
<ul>
<li>Apache License, Version 2.0, (LICENSE-APACHE or
http://www.apache.org/licenses/LICENSE-2.0)</li>
<li>MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)</li>
</ul>
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