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<ol class="chapter"><li class="chapter-item expanded "><a href="../intro/index.html"><strong aria-hidden="true">1.</strong> 简介</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../intro/hardware.html"><strong aria-hidden="true">1.1.</strong> 硬件</a></li><li class="chapter-item expanded "><a href="../intro/no-std.html"><strong aria-hidden="true">1.2.</strong> no_std</a></li><li class="chapter-item expanded "><a href="../intro/tooling.html"><strong aria-hidden="true">1.3.</strong> 工具</a></li><li class="chapter-item expanded "><a href="../intro/install.html"><strong aria-hidden="true">1.4.</strong> 安装</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../intro/install/linux.html"><strong aria-hidden="true">1.4.1.</strong> Linux</a></li><li class="chapter-item expanded "><a href="../intro/install/macos.html"><strong aria-hidden="true">1.4.2.</strong> MacOS</a></li><li class="chapter-item expanded "><a href="../intro/install/windows.html"><strong aria-hidden="true">1.4.3.</strong> Windows</a></li><li class="chapter-item expanded "><a href="../intro/install/verify.html"><strong aria-hidden="true">1.4.4.</strong> 验证安装</a></li></ol></li></ol></li><li class="chapter-item expanded "><a href="../start/index.html"><strong aria-hidden="true">2.</strong> 入门</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../start/qemu.html"><strong aria-hidden="true">2.1.</strong> QEMU</a></li><li class="chapter-item expanded "><a href="../start/hardware.html"><strong aria-hidden="true">2.2.</strong> 硬件</a></li><li class="chapter-item expanded "><a href="../start/registers.html"><strong aria-hidden="true">2.3.</strong> 内存映射寄存器</a></li><li class="chapter-item expanded "><a href="../start/semihosting.html"><strong aria-hidden="true">2.4.</strong> 半主机</a></li><li class="chapter-item expanded "><a href="../start/panicking.html"><strong aria-hidden="true">2.5.</strong> 恐慌</a></li><li class="chapter-item expanded "><a href="../start/exceptions.html"><strong aria-hidden="true">2.6.</strong> 异常</a></li><li class="chapter-item expanded "><a href="../start/interrupts.html" class="active"><strong aria-hidden="true">2.7.</strong> 中断</a></li><li class="chapter-item expanded "><a href="../start/io.html"><strong aria-hidden="true">2.8.</strong> IO</a></li></ol></li><li class="chapter-item expanded "><a href="../peripherals/index.html"><strong aria-hidden="true">3.</strong> 外设</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../peripherals/a-first-attempt.html"><strong aria-hidden="true">3.1.</strong> 初试Rust</a></li><li class="chapter-item expanded "><a href="../peripherals/borrowck.html"><strong aria-hidden="true">3.2.</strong> 借用检查器</a></li><li class="chapter-item expanded "><a href="../peripherals/singletons.html"><strong aria-hidden="true">3.3.</strong> 单例</a></li></ol></li><li class="chapter-item expanded "><a href="../static-guarantees/index.html"><strong aria-hidden="true">4.</strong> 静态保证</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../static-guarantees/typestate-programming.html"><strong aria-hidden="true">4.1.</strong> 类型状态机编程</a></li><li class="chapter-item expanded "><a href="../static-guarantees/state-machines.html"><strong aria-hidden="true">4.2.</strong> 外设作为状态机</a></li><li class="chapter-item expanded "><a href="../static-guarantees/design-contracts.html"><strong aria-hidden="true">4.3.</strong> 设计合约</a></li><li class="chapter-item expanded "><a href="../static-guarantees/zero-cost-abstractions.html"><strong aria-hidden="true">4.4.</strong> 零成本抽象</a></li></ol></li><li class="chapter-item expanded "><a href="../portability/index.html"><strong aria-hidden="true">5.</strong> 可移植性</a></li><li class="chapter-item expanded "><a href="../concurrency/index.html"><strong aria-hidden="true">6.</strong> 并发</a></li><li class="chapter-item expanded "><a href="../collections/index.html"><strong aria-hidden="true">7.</strong> 容器</a></li><li class="chapter-item expanded "><a href="../c-tips/index.html"><strong aria-hidden="true">8.</strong> 嵌入式C开发人员的技巧</a></li><li class="chapter-item expanded "><a href="../interoperability/index.html"><strong aria-hidden="true">9.</strong> 互操作性</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../interoperability/c-with-rust.html"><strong aria-hidden="true">9.1.</strong> Rust中使用C代码</a></li><li class="chapter-item expanded "><a href="../interoperability/rust-with-c.html"><strong aria-hidden="true">9.2.</strong> C中使用Rust代码</a></li></ol></li><li class="chapter-item expanded "><a href="../unsorted/index.html"><strong aria-hidden="true">10.</strong> 其他主题</a></li><li><ol class="section"><li class="chapter-item expanded "><a href="../unsorted/speed-vs-size.html"><strong aria-hidden="true">10.1.</strong> 优化：速度大小的权衡</a></li><li class="spacer"></li></ol></li><li class="chapter-item expanded "><a href="../appendix/glossary.html">Appendix A: Glossary</a></li></ol>
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<h1><a class="header" href="#中断" id="中断">中断</a></h1>
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<p>中断在很多方面与异常不同，但是它们的操作和使用在很大程度上相似，并且它们也由同一中断控制器处理。异常是由Cortex-M架构统一定义的，中断则在命名和功能上随供应商(甚至是芯片)不同而不同。</p>
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<p>中断确实具有很大的灵活性，在尝试以高级方式使用它们时需要考虑这些灵活性。我们不会在本书中介绍这些用法，但是请牢记以下几点：</p>
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<ul>
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<li>中断具有可编程的优先级，该优先级确定其处理程序的执行顺序</li>
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<li>中断可以嵌套和抢占，即中断处理程序的执行可能会被另一个更高优先级的中断抢占</li>
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<li>通常需要清除导致中断触发的事件，以防止无限次重新进入中断处理程序</li>
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</ul>
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<p>中断的常规初始化步骤始终相同：</p>
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<ul>
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<li>配置外设,在需要的情况下生成中断请求</li>
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<li>在中断控制器中设置所需的中断处理程序优先级</li>
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<li>在中断控制器中启用中断处理程序</li>
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</ul>
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<p>与异常类似，<code>cortex-m-rt</code> crate 提供了一个<a href="https://docs.rs/cortex-m-rt-macros/0.1.5/cortex_m_rt_macros/attr.interrupt.html"><code>interrupt</code></a>属性来声明中断处理程序。可用的中断(及其在中断处理程序表中的位置)通常是使用<code>svd2rust</code>基于SVD描述文件自动生成的。</p>
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<pre><code class="language-rust ignore">// Interrupt handler for the Timer2 interrupt
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#[interrupt]
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fn TIM2() {
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// ..
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// Clear reason for the generated interrupt request
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}
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</code></pre>
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<p>中断处理程序类似于异常处理程序，它们不能被固件的其他部分直接调用。但是可以在软件中生成中断请求，以触发对中断处理程序。</p>
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<p>与异常处理程序类似，在中断处理程序中声明<code>static mut</code>变量也是安全的。</p>
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<pre><code class="language-rust ignore">#[interrupt]
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fn TIM2() {
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static mut COUNT: u32 = 0;
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// `COUNT` has type `&mut u32` and it's safe to use
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*COUNT += 1;
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}
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</code></pre>
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<p>有关此处演示的机制的更详细说明，请参考<a href="./exceptions.html">异常</a>。</p>
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