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看门狗 §3.2 流程图重绘为 SVG：任务置位→校验者判定→喂狗 + 时间轴

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<svg xmlns="http://www.w3.org/2000/svg" width="1440" height="950" viewBox="0 0 1440 950" font-family="Microsoft YaHei, Segoe UI, PingFang SC, sans-serif">
<text x="40" y="44" font-size="21" font-weight="700" fill="#0f172a">看门狗心跳模型 · 任务置位 → 校验者判定 → 校验者喂狗</text>
<text x="40" y="70" font-size="13" fill="#64748b">IWDG + 单字心跳位图 · 由 defaultTask 独占喂狗权（唯一喂狗者）</text>
<rect x="40" y="98" width="16" height="16" rx="4" fill="#ffffff" stroke="#2563eb" stroke-width="2"/>
<text x="62" y="110" font-size="12" fill="#475569">生产者（任务置位）</text>
<rect x="200" y="98" width="16" height="16" rx="4" fill="#ffffff" stroke="#0d9488" stroke-width="2"/>
<text x="222" y="110" font-size="12" fill="#475569">心跳位图</text>
<rect x="300" y="98" width="16" height="16" rx="4" fill="#ffffff" stroke="#7c3aed" stroke-width="2"/>
<text x="322" y="110" font-size="12" fill="#475569">校验者（喂狗者）</text>
<rect x="448" y="98" width="16" height="16" rx="4" fill="#ffffff" stroke="#16a34a" stroke-width="2"/>
<text x="470" y="110" font-size="12" fill="#475569">喂狗</text>
<rect x="524" y="98" width="16" height="16" rx="4" fill="#ffffff" stroke="#e11d48" stroke-width="2"/>
<text x="546" y="110" font-size="12" fill="#475569">停喂 / 复位</text>
<rect x="40" y="148" width="470" height="584" rx="14" fill="#f8fafc" stroke="#64748b" stroke-opacity="0.28"/>
<text x="60" y="178" font-size="15.0" font-weight="700" fill="#334155">各任务主循环（生产者）—— 每轮只置位，不清零</text>
<text x="60" y="202" font-size="13" font-weight="700" fill="#2563eb">s_hb_bits |= (1u &lt;&lt; MY_ID)</text>
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<text x="91.0" y="246.5" font-size="12" font-weight="700" fill="#ffffff" text-anchor="middle">b0</text>
<text x="118.0" y="246.0" font-size="14" font-weight="700" fill="#0f172a">defaultTask</text>
<text x="118.0" y="266.0" font-size="11.5" fill="#64748b">配置属主 / syslog 唯一写者 · 50ms 基准</text>
<rect x="62.0" y="300.0" width="426.0" height="62" rx="9" fill="#eff6ff" stroke="#2563eb" stroke-opacity="0.5"/>
<rect x="74.0" y="310.0" width="34" height="24" rx="6" fill="#2563eb"/>
<text x="91.0" y="326.5" font-size="12" font-weight="700" fill="#ffffff" text-anchor="middle">b1</text>
<text x="118.0" y="326.0" font-size="14" font-weight="700" fill="#0f172a">netTask</text>
<text x="118.0" y="346.0" font-size="11.5" fill="#64748b">net_poll 循环 · 1ms 节拍</text>
<rect x="62.0" y="380.0" width="426.0" height="62" rx="9" fill="#eff6ff" stroke="#2563eb" stroke-opacity="0.5"/>
<rect x="74.0" y="390.0" width="34" height="24" rx="6" fill="#2563eb"/>
<text x="91.0" y="406.5" font-size="12" font-weight="700" fill="#ffffff" text-anchor="middle">b2</text>
<text x="118.0" y="406.0" font-size="14" font-weight="700" fill="#0f172a">ftpTask</text>
<text x="118.0" y="426.0" font-size="11.5" fill="#64748b">lftpd 事件循环（需在 lftpd 侧埋点）</text>
<rect x="62.0" y="460.0" width="426.0" height="62" rx="9" fill="#eff6ff" stroke="#2563eb" stroke-opacity="0.5"/>
<rect x="74.0" y="470.0" width="34" height="24" rx="6" fill="#2563eb"/>
<text x="91.0" y="486.5" font-size="12" font-weight="700" fill="#ffffff" text-anchor="middle">b4</text>
<text x="118.0" y="486.0" font-size="14" font-weight="700" fill="#0f172a">uiTask</text>
<text x="118.0" y="506.0" font-size="11.5" fill="#64748b">LVGL 主循环 · 10ms 节拍</text>
<rect x="62.0" y="540.0" width="426.0" height="62" rx="9" fill="#eff6ff" stroke="#2563eb" stroke-opacity="0.5"/>
<rect x="74.0" y="550.0" width="34" height="24" rx="6" fill="#2563eb"/>
<text x="91.0" y="566.5" font-size="12" font-weight="700" fill="#ffffff" text-anchor="middle">b5</text>
<text x="118.0" y="566.0" font-size="14" font-weight="700" fill="#0f172a">timeSyncTask</text>
<text x="118.0" y="586.0" font-size="11.5" fill="#64748b">NTP 轮询 · ≤50ms</text>
<rect x="62.0" y="626.0" width="426.0" height="48" rx="9" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.6"/>
<text x="76.0" y="646.0" font-size="12" font-weight="700" fill="#0d9488">心跳位图 s_hb_bits（32 位单字）</text>
<text x="76.0" y="664.0" font-size="11" fill="#64748b">就绪掩码 0x37 = bit0|1|2|4|5（bit3=testTask 默认不在内）</text>
<rect x="76.0" y="682.0" width="34" height="22" rx="4" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.70"/>
<text x="93.0" y="697.0" font-size="11" font-weight="700" fill="#0d9488" text-anchor="middle">0</text>
<rect x="116.0" y="682.0" width="34" height="22" rx="4" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.70"/>
<text x="133.0" y="697.0" font-size="11" font-weight="700" fill="#0d9488" text-anchor="middle">1</text>
<rect x="156.0" y="682.0" width="34" height="22" rx="4" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.70"/>
<text x="173.0" y="697.0" font-size="11" font-weight="700" fill="#0d9488" text-anchor="middle">2</text>
<rect x="196.0" y="682.0" width="34" height="22" rx="4" fill="#f1f5f9" stroke="#94a3b8" stroke-opacity="0.40"/>
<text x="213.0" y="697.0" font-size="11" font-weight="700" fill="#94a3b8" text-anchor="middle">3</text>
<rect x="236.0" y="682.0" width="34" height="22" rx="4" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.70"/>
<text x="253.0" y="697.0" font-size="11" font-weight="700" fill="#0d9488" text-anchor="middle">4</text>
<rect x="276.0" y="682.0" width="34" height="22" rx="4" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.70"/>
<text x="293.0" y="697.0" font-size="11" font-weight="700" fill="#0d9488" text-anchor="middle">5</text>
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<line x1="488.0" y1="331.0" x2="484.0" y2="331.0" stroke="#2563eb" stroke-width="2.2"/>
<line x1="488.0" y1="411.0" x2="484.0" y2="411.0" stroke="#2563eb" stroke-width="2.2"/>
<line x1="488.0" y1="491.0" x2="484.0" y2="491.0" stroke="#2563eb" stroke-width="2.2"/>
<line x1="488.0" y1="571.0" x2="484.0" y2="571.0" stroke="#2563eb" stroke-width="2.2"/>
<line x1="484.0" y1="251.0" x2="484.0" y2="650.0" stroke="#2563eb" stroke-width="2.2"/>
<line x1="484.0" y1="650.0" x2="488.0" y2="650.0" stroke="#2563eb" stroke-width="2.2"/>
<path d="M 488.0 650.0 L 477.0 655.5 L 477.0 644.5 z" fill="#2563eb"/>
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<text x="564" y="178" font-size="15.0" font-weight="700" fill="#334155">defaultTask 主循环（唯一喂狗者 · 消费者）</text>
<rect x="566.0" y="204.0" width="812.0" height="62.0" rx="10" fill="#f5f3ff" stroke="#7c3aed" stroke-opacity="0.55"/>
<text x="580.0" y="228.0" font-size="14" font-weight="700" fill="#0f172a">① 节流：每 100ms 抽样一次</text>
<text x="580.0" y="246.5" font-size="11.5" fill="#64748b">now - last_tick &lt; 100ms 则直接返回（defaultTask 50ms 循环的整数倍）</text>
<line x1="972.0" y1="266.0" x2="972.0" y2="306.0" stroke="#7c3aed" stroke-width="2.2"/>
<path d="M 972.0 306.0 L 966.5 295.0 L 977.5 295.0 z" fill="#7c3aed"/>
<rect x="566.0" y="306.0" width="812.0" height="62.0" rx="10" fill="#f0fdfa" stroke="#0d9488" stroke-opacity="0.55"/>
<text x="580.0" y="330.0" font-size="14" font-weight="700" fill="#0f172a">② 取走并清零（单字原子）</text>
<text x="580.0" y="348.5" font-size="11.5" fill="#64748b">snapshot = s_hb_bits; s_hb_bits = 0; ← 读-改-写天然原子，免临界区</text>
<line x1="972.0" y1="368.0" x2="972.0" y2="408.0" stroke="#0d9488" stroke-width="2.2"/>
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<rect x="566.0" y="408.0" width="812.0" height="62.0" rx="10" fill="#f5f3ff" stroke="#7c3aed" stroke-opacity="0.55"/>
<text x="580.0" y="432.0" font-size="14" font-weight="700" fill="#0f172a">③ 掩码判定</text>
<text x="580.0" y="450.5" font-size="11.5" fill="#64748b">snapshot == 0x37（bit0|1|2|4|5 全中）？</text>
<line x1="488.0" y1="650.0" x2="544.0" y2="650.0" stroke="#0d9488" stroke-width="2.2"/>
<line x1="544.0" y1="650.0" x2="544.0" y2="337.0" stroke="#0d9488" stroke-width="2.2"/>
<line x1="544.0" y1="337.0" x2="566.0" y2="337.0" stroke="#0d9488" stroke-width="2.2"/>
<path d="M 566.0 337.0 L 555.0 342.5 L 555.0 331.5 z" fill="#0d9488"/>
<text x="494.0" y="642.0" font-size="11.5" fill="#0d9488" text-anchor="middle">快照</text>
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<line x1="763.0" y1="484.0" x2="763.0" y2="484.0" stroke="#16a34a" stroke-width="2.2"/>
<line x1="972.0" y1="484.0" x2="1181.0" y2="484.0" stroke="#d97706" stroke-width="2.2"/>
<line x1="763.0" y1="484.0" x2="763.0" y2="486.0" stroke="#16a34a" stroke-width="2.2"/>
<path d="M 763.0 486.0 L 757.5 475.0 L 768.5 475.0 z" fill="#16a34a"/>
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<path d="M 1181.0 486.0 L 1175.5 475.0 L 1186.5 475.0 z" fill="#d97706"/>
<text x="763.0" y="480.0" font-size="11.5" font-weight="700" fill="#16a34a" text-anchor="middle">是</text>
<text x="1181.0" y="480.0" font-size="11.5" font-weight="700" fill="#d97706" text-anchor="middle">否</text>
<rect x="566.0" y="486.0" width="394.0" height="84.0" rx="10" fill="#f0fdf4" stroke="#16a34a" stroke-opacity="0.55"/>
<text x="580.0" y="510.0" font-size="13" font-weight="700" fill="#0f172a">全员到位 → 喂狗</text>
<text x="580.0" y="527.5" font-size="10.5" fill="#64748b">s_miss_streak = 0</text>
<text x="580.0" y="545.0" font-size="10.5" fill="#64748b">IWDG-&gt;KR = 0xAAAA;</text>
<rect x="984.0" y="486.0" width="394.0" height="84.0" rx="10" fill="#fffbeb" stroke="#d97706" stroke-opacity="0.55"/>
<text x="998.0" y="510.0" font-size="13" font-weight="700" fill="#0f172a">有缺席 → 累计，不喂狗</text>
<text x="998.0" y="527.5" font-size="10.5" fill="#64748b">s_miss_total++ / streak++</text>
<text x="998.0" y="545.0" font-size="10.5" fill="#64748b">连续 8 次 → 打 [WD] task stall 后停喂</text>
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<text x="60" y="794" font-size="15.0" font-weight="700" fill="#334155">停喂之后：时间轴上的三个时刻（0.8s 停喂 → 1.7s 最坏溢出 → 2.5s 标称）</text>
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<text x="298.4" y="862.0" font-size="11.5" fill="#16a34a" text-anchor="middle">仍照常喂狗</text>
<text x="298.4" y="878.0" font-size="10.5" fill="#94a3b8" text-anchor="middle">miss_streak 1 → 8</text>
<rect x="496.8" y="828.0" width="446.4" height="14" rx="3" fill="#e11d48" opacity="0.75"/>
<text x="720.0" y="862.0" font-size="11.5" fill="#e11d48" text-anchor="middle">已停喂 → 等 IWDG 自然溢出</text>
<text x="720.0" y="878.0" font-size="10.5" fill="#94a3b8" text-anchor="middle">worst case（LSI 47kHz）</text>
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<text x="1141.6" y="862.0" font-size="11.5" fill="#d97706" text-anchor="middle">标称溢出窗口</text>
<text x="1141.6" y="878.0" font-size="10.5" fill="#94a3b8" text-anchor="middle">LSI 32kHz</text>
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<text x="100.0" y="816.0" font-size="11" font-weight="700" fill="#475569" text-anchor="middle">0s</text>
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<text x="496.8" y="816.0" font-size="11" font-weight="700" fill="#475569" text-anchor="middle">0.8s</text>
<line x1="943.2" y1="822.0" x2="943.2" y2="842.0" stroke="#475569" stroke-width="1.6"/>
<text x="943.2" y="816.0" font-size="11" font-weight="700" fill="#475569" text-anchor="middle">1.7s</text>
<line x1="1340.0" y1="822.0" x2="1340.0" y2="842.0" stroke="#475569" stroke-width="1.6"/>
<text x="1340.0" y="816.0" font-size="11" font-weight="700" fill="#475569" text-anchor="middle">2.5s</text>
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<line x1="943.2" y1="824.0" x2="943.2" y2="848.0" stroke="#d97706" stroke-width="1.6" stroke-dasharray="5 4"/>
<line x1="496.8" y1="896.0" x2="943.2" y2="896.0" stroke="#16a34a" stroke-width="1.6" stroke-dasharray="3 3"/>
<text x="720.0" y="912.0" font-size="11" fill="#16a34a" text-anchor="middle">裕度 ≈ 900ms</text>
<text x="40" y="936" font-size="12" fill="#64748b">喂狗 = &quot;所有被监视任务都在 100ms 窗口内动过&quot;；任一任务卡死 → 位图长期残缺 → 停喂 → IWDG 复位（保留 IWDGRSTF 权威归因）。对应 task_watchdog.c / 设计说明 §3.2。</text>
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