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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" 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/watchdog/watchdog-user-guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">Watchdog 使用指南</h1><div class="date inPage">26 Nov 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d249197e22__20250121171702">看门狗 (Watchdog, WDT)
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定时器可以监控系统的健康状态，并在系统无法正常使用时，强制复位系统。看门狗内部有一个递减计数器，在系统正常运行期间，通过重置计数可以保证看门狗模块不触发复位。</p><div class="table-container"><table class="- topic/table table frame-all" id="watchdog__table_pkr_nct_c1c" data-ofbid="watchdog__table_pkr_nct_c1c" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">术语定义</span></caption><colgroup><col style="width:14.306151645207438%"/><col style="width:28.898426323319025%"/><col style="width:56.79542203147353%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="watchdog__table_pkr_nct_c1c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="watchdog__table_pkr_nct_c1c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="watchdog__table_pkr_nct_c1c__entry__3">注释说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__1">WDT</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__2">Watchdog，下文简称 wdt</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__3">看门狗</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__1">clr_thd</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__2">Clear threshold</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__3">清看门狗的计数时，当前计数必须要满足此门限</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__1">irq_thd</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__2">IRQ threshold</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__3">看门狗产生中断的计数值</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__1">rst_thd</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__2">Reset threshold</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="watchdog__table_pkr_nct_c1c__entry__3">看门狗触发系统重启的门限值</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="watchdog__table_pkr_nct_c1c__entry__1">ping</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="watchdog__table_pkr_nct_c1c__entry__2">-</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="watchdog__table_pkr_nct_c1c__entry__3">指将看门狗的计时器清零，使其重新计数，俗称“喂狗”</td></tr></tbody></table></div><section class="- topic/section section" id="watchdog__id3" data-ofbid="watchdog__id3"><h2 class="- topic/title title sectiontitle">Watchdog 功能说明</h2>
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<p class="- topic/p p" data-ofbid="d249197e80__20250121171702">Watchdog
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V1.0
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提供了下列系统监控和保护功能：</p>
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<ol class="- topic/ol ol arabic simple" id="watchdog__ol_rmx_cxh_bdc" data-ofbid="watchdog__ol_rmx_cxh_bdc"><li class="- topic/li li" data-ofbid="d249197e88__20250121171702">
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<p class="- topic/p p" data-ofbid="d249197e90__20250121171702"><strong class="+ topic/ph hi-d/b ph b">中断信号通知</strong>：在复位系统前先（时刻可配置），Watchdog 能够发出一个中断信号，通知系统做复位前的准备工作。</p>
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<p class="- topic/p p" data-ofbid="d249197e95__20250121171702">中断信号通知可允许系统在被强制复位之前执行一些关键操作，例如保存当前状态或清理资源。</p>
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</li><li class="- topic/li li" data-ofbid="d249197e98__20250121171702">
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<p class="- topic/p p" data-ofbid="d249197e100__20250121171702"><strong class="+ topic/ph hi-d/b ph b">计数器清零限制</strong>：仅在当前计数值满足某个门限（可配置）值时才能执行清零操作。</p>
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<p class="- topic/p p" data-ofbid="d249197e105__20250121171702">计数器清零限制有助于防止误操作导致的不必要复位，提高系统的可靠性。</p>
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<figure class="- topic/fig fig fignone" id="watchdog__fig_xwq_qct_c1c" data-ofbid="watchdog__fig_xwq_qct_c1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="watchdog__image_smx_cxh_bdc" src="../../../images/watchdog/wdt_clr_window.png" alt="wdt_clr_window"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Watchdog 清零的窗口示意</span></figcaption></figure>
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</li><li class="- topic/li li" data-ofbid="d249197e115__20250121171702">
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<p class="- topic/p p" data-ofbid="d249197e117__20250121171702"><strong class="+ topic/ph hi-d/b ph b">多通道配置</strong>：支持预先加载四个 Watchdog 的配置，运行时可一键切换。软件可以理解为多通道，目前只开放一个通道，即通道 0。</p>
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<p class="- topic/p p" data-ofbid="d249197e122__20250121171702">多通道配置适用于需要在不同工作模式间灵活切换的系统，增强了系统的适应性和灵活性。</p>
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</li><li class="- topic/li li" data-ofbid="d249197e125__20250121171702">
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<p class="- topic/p p" data-ofbid="d249197e127__20250121171702"><strong class="+ topic/ph hi-d/b ph b">写失效保护机制</strong>：当配置了写失效，除了 OP 和 IRQ_STA 寄存器可读以外，其他寄存器均不可读。</p>
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<p class="- topic/p p" data-ofbid="d249197e132__20250121171702">写失效保护适用于上述所有功能操作，可防止意外或恶意的软件修改 Watchdog 配置，保证系统的安全稳定运行。</p>
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<figure class="- topic/fig fig fignone" id="watchdog__id5" data-ofbid="watchdog__id5"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="watchdog__image_umx_cxh_bdc" src="../../../images/watchdog/wdt_wr_protect.png" width="384" alt="wdt_wr_protect"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Watchdog 写保护的状态迁移</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d249197e142__20250121171702">展示了不同状态下可进行的操作，以及如何进入和退出状态：</p>
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<ul class="- topic/ul ul simple" id="watchdog__ul_vmx_cxh_bdc" data-ofbid="watchdog__ul_vmx_cxh_bdc"><li class="- topic/li li" data-ofbid="d249197e146__20250121171702">
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<dl class="- topic/dl dl simple" id="watchdog__dl_wmx_cxh_bdc" data-ofbid="watchdog__dl_wmx_cxh_bdc"><dt class="- topic/dt dt dlterm" data-ofbid="d249197e150__20250121171702">写允许</dt><dd class="- topic/dd dd">
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<p class="- topic/p p" data-ofbid="d249197e154__20250121171702">普通状态，无任何权限限制，随时可重新配置计数器。</p>
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</dd></dl>
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</li><li class="- topic/li li" data-ofbid="d249197e158__20250121171702">
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<dl class="- topic/dl dl simple" id="watchdog__dl_xmx_cxh_bdc" data-ofbid="watchdog__dl_xmx_cxh_bdc"><dt class="- topic/dt dt dlterm" data-ofbid="d249197e162__20250121171702">写保护</dt><dd class="- topic/dd dd">
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<p class="- topic/p p" data-ofbid="d249197e166__20250121171702"> 如果要重新配置 Watchdog 计时器，需先写入操作码 OP_WR_EN 解锁（进入“写允许”状态）。</p>
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</dd></dl>
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</li><li class="- topic/li li" data-ofbid="d249197e170__20250121171702">
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<dl class="- topic/dl dl simple" id="watchdog__dl_ymx_cxh_bdc" data-ofbid="watchdog__dl_ymx_cxh_bdc"><dt class="- topic/dt dt dlterm" data-ofbid="d249197e174__20250121171702">写失效</dt><dd class="- topic/dd dd">
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<p class="- topic/p p" data-ofbid="d249197e178__20250121171702"> 此时 Watchdog 进入只读状态，只有 OP
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寄存器可写（用于喂狗、切换通道）。从图中可以看到此状态不可逆，如果要修改 Watchdog 配置，必须要
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reset 系统才可以。</p>
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</dd></dl>
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</li></ul>
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</li><li class="- topic/li li" data-ofbid="d249197e183__20250121171702">
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<p class="- topic/p p" data-ofbid="d249197e185__20250121171702"><strong class="+ topic/ph hi-d/b ph b">支持操作码 (Operate Code)</strong>：支持多种操作码，如计时器清零、通道切换、写使能等，以实现更精细的控制。</p>
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