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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/interrupt/interrupt_config_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">中断配置</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body body"><div class="- topic/p p" data-ofbid="d48886e20__20250121171518">本节适用以下产品平台：<ul class="- topic/ul ul" id="id__ul_f52_z2n_mdc" data-ofbid="id__ul_f52_z2n_mdc"><li class="- topic/li li" data-ofbid="d48886e23__20250121171518">
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<p class="- topic/p p" data-ofbid="d48886e25__20250121171518"></p>
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</li><li class="- topic/li li" data-ofbid="d48886e27__20250121171518">
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<p class="- topic/p p" data-ofbid="d48886e29__20250121171518"></p>
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</li></ul></div><section class="- topic/section section" id="id__ref-to-lite-interrupt-cfg" data-ofbid="id__ref-to-lite-interrupt-cfg"><h2 class="- topic/title title sectiontitle">中断嵌套</h2>
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<p class="- topic/p p" data-ofbid="d48886e36__20250121171518">中断嵌套是指一个高优先级的中断可以打断正在执行的低优先级中断，允许系统在处理紧急任务时，能够及时响应更高级别的中断请求。中断优先级可配置为 0-7 ，所有中断默认优先级为 0 。</p>
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<figure class="- topic/fig fig fignone" data-ofbid="d48886e39__20250121171518"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_fzd_qcd_bdc" src="../../../images/interrupt/irq_nest.png" width="480" alt="irq_nest"/></div><br/></figure>
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<div class="- topic/p p" data-ofbid="d48886e44__20250121171518">通过以下 API
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设置或查询某个中断的优先级：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_evx_rsj_bdc" data-ofbid="id__codeblock_evx_rsj_bdc">aicos_irq_set_prio(UART0_IRQn, <span class="hl-number">2</span>); <em class="hl-comment">// 设置 UART0 的中断优先级为 2</em>
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aicos_irq_get_prio(UART0_IRQn); <em class="hl-comment">// 获取 UART0 的中断优先级</em></pre></div>
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<div class="- topic/note note note note_note" id="id__note_ths_tsj_bdc" data-ofbid="id__note_ths_tsj_bdc"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d48886e51__20250121171518">用来处理进程切换的软件中断 <span class="+ topic/keyword pr-d/apiname keyword apiname">Pend SV_Handler</span> 不支持中断嵌套。</p>
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</div>
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</section><section class="- topic/section section" id="id__id4" data-ofbid="id__id4"><h2 class="- topic/title title sectiontitle">超级中断</h2>
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<p class="- topic/p p" data-ofbid="d48886e63__20250121171518">超级中断功能是指高优先级的中断不仅能实现中断嵌套，还能突破 Kernel
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全局中断开关的限制。超级中断通过设置一个优先级门限来实现。当中断优先级高于这个门限时，即使全局中断被禁用，超级中断也能执行。</p>
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<p class="- topic/p p" data-ofbid="d48886e66__20250121171518"><strong class="+ topic/ph hi-d/b ph b">配置方法</strong></p>
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<div class="- topic/p p" data-ofbid="d48886e70__20250121171518">可以通过 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span> 命令进入 menuconfig
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配置界面，配置超级中断的相关参数：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_afm_c1v_hdc" data-ofbid="id__codeblock_afm_c1v_hdc">Chip options --->
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[*] Use threshold as global interrupt <strong class="hl-keyword">switch</strong> <em class="hl-comment">// 启用超级中断</em>
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(<span class="hl-number">6</span>) Threshold value (<span class="hl-number">0</span>-<span class="hl-number">7</span>) (NEW) <em class="hl-comment">// 设置中断优先级门限，大于该门限的中断为超级中断</em></pre></div>
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<div class="- topic/p p" data-ofbid="d48886e78__20250121171518">RT-Thread 下全局中断的开关函数为 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_hw_interrupt_enable()</span> /
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<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_hw_interrupt_disable()</span>：<ul class="- topic/ul ul" id="id__ul_dgn_gtn_mdc" data-ofbid="id__ul_dgn_gtn_mdc"><li class="- topic/li li" data-ofbid="d48886e87__20250121171518">对于普通中断模式，通过操控 <span class="+ topic/keyword pr-d/parmname keyword parmname">mstatus</span> 寄存器中的 <span class="+ topic/keyword pr-d/parmname keyword parmname">MIE</span> bit
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可以实现中断的全局开关，原理如下： <figure class="- topic/fig fig fignone" id="id__fig_m4y_b1v_hdc" data-ofbid="id__fig_m4y_b1v_hdc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_jzd_qcd_bdc" src="../../../images/interrupt/normal_int.png" alt="normal_int"/></div><br/></figure></li><li class="- topic/li li" data-ofbid="d48886e99__20250121171518">
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<div class="- topic/p p" data-ofbid="d48886e101__20250121171518">把 <span class="+ topic/keyword pr-d/parmname keyword parmname">mstatus</span> 寄存器中的 <span class="+ topic/keyword pr-d/parmname keyword parmname">MIE</span> bit
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保持常开，通过设置中断门限来实现中断的全局开关，可以保证一部分超级中断能突破
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<span class="+ topic/keyword pr-d/apiname keyword apiname">rt_hw_interrupt_disable()</span> 的限制，原理如下图所示：<figure class="- topic/fig fig fignone" id="id__fig_n4y_b1v_hdc" data-ofbid="id__fig_n4y_b1v_hdc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_kzd_qcd_bdc" src="../../../images/interrupt/super_int.png" alt="super_int"/></div><br/></figure></div>
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</li></ul></div>
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<div class="- topic/note note attention note_attention" id="id__note_vf4_g1v_hdc" data-ofbid="id__note_vf4_g1v_hdc"><span class="note__title">注意：</span>
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<p class="- topic/p p" data-ofbid="d48886e121__20250121171518">超级中断中不能访问使用 <span class="+ topic/keyword pr-d/apiname keyword apiname">rt_hw_interrupt_disable()</span>
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保护的竞态资源，因为这时候的访问时不安全的，意味着大部分 Kernel 提供的 API 不能使用。</p>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#id__ref-to-lite-interrupt-cfg" data-tocid="id__ref-to-lite-interrupt-cfg">中断嵌套</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id4" data-tocid="id__id4">超级中断</a></div></li></ul></div>
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