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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/rtc/rtc-key-procedure.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">26 Nov 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="rtc_key_procedures__section_h1w_z5s_c1c" data-ofbid="rtc_key_procedures__section_h1w_z5s_c1c"><h2 class="- topic/title title sectiontitle">校准算法设计</h2>
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<div class="- topic/p p" data-ofbid="d100703e28__20250121171536">校准的算法原理是，将输入的 32 KHz 晶振时钟校准到理想的 32
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KHz，公式如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_key_procedures__codeblock_fbx_sdg_f1c" data-ofbid="rtc_key_procedures__codeblock_fbx_sdg_f1c">(<span class="hl-number">100</span> * <span class="hl-number">1024</span> * <span class="hl-number">1024</span> + <span class="hl-number">100</span> * calibrate) / (clock-rate / <span class="hl-number">32</span>) = <span class="hl-number">1024</span>
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=> calibrate = (clock-rate * <span class="hl-number">32</span> - <span class="hl-number">100</span> * <span class="hl-number">1024</span> * <span class="hl-number">1024</span>) / <span class="hl-number">100</span>;</pre></div>
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<p class="- topic/p p" data-ofbid="d100703e33__20250121171536">其中：</p>
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<ul class="- topic/ul ul" id="rtc_key_procedures__ul_j1w_z5s_c1c" data-ofbid="rtc_key_procedures__ul_j1w_z5s_c1c"><li class="- topic/li li" data-ofbid="d100703e37__20250121171536">
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<p class="- topic/p p" data-ofbid="d100703e39__20250121171536"><span class="+ topic/keyword pr-d/parmname keyword parmname">clock-rate</span>: 是用户实测 32K 晶振的频率值 * 100，需要配置在 DTS 中，详见 <a class="- topic/xref xref" href="rtc-config-guide.html#rtc_configuration__table_zjx_1ss_c1c">RTC 自定义参数</a></p>
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</li><li class="- topic/li li" data-ofbid="d100703e47__20250121171536">
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<p class="- topic/p p" data-ofbid="d100703e49__20250121171536"><span class="+ topic/keyword pr-d/parmname keyword parmname">calibrate</span>: 最终要填入 RTC 控制器的校准值</p>
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<div class="- topic/note note note note_note" id="rtc_key_procedures__note_wyf_fvs_c1c" data-ofbid="rtc_key_procedures__note_wyf_fvs_c1c"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d100703e56__20250121171536">校准值 calibrate 分正负，正 - 表示 32K 晶振实际偏快了，负 - 表示 32K 晶振偏慢了。</p>
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</div>
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</li></ul>
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</section><section class="- topic/section section" id="rtc_key_procedures__section_k1w_z5s_c1c" data-ofbid="rtc_key_procedures__section_k1w_z5s_c1c"><h2 class="- topic/title title sectiontitle">系统状态的备份功能</h2>
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<p class="- topic/p p" data-ofbid="d100703e66__20250121171536">RTC 控制器提供了 128-bit 备份寄存器 SYS_BAK，用于掉电时一些重要状态或者参数的保存。RTC 驱动将这几个寄存器封装为对外接口（
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<code class="+ topic/ph pr-d/codeph ph codeph">EXPORT_SYMBOL_GPL()</code> 的形式)，Linux 中其他驱动都可以调用。</p>
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</section><section class="- topic/section section" id="rtc_key_procedures__section_l1w_z5s_c1c" data-ofbid="rtc_key_procedures__section_l1w_z5s_c1c"><h2 class="- topic/title title sectiontitle">Reboot Reason 的设计</h2>
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<p class="- topic/p p" data-ofbid="d100703e78__20250121171536">将<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-key-procedure.html#rtc_key_procedures__section_k1w_z5s_c1c">系统状态的备份功能</a> 中 <strong class="+ topic/ph hi-d/b ph b">系统备份寄存器</strong> 保存不同情况的
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Reboot reason，可用于分析终端运行稳定性问题、进入快速启动模式等场景。</p>
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<p class="- topic/p p" data-ofbid="d100703e88__20250121171536">SYS_BAK 寄存器需要和 WRI 模块一起配合来完成 reason 的处理：</p>
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<ol class="- topic/ol ol" id="rtc_key_procedures__ol_m1w_z5s_c1c" data-ofbid="rtc_key_procedures__ol_m1w_z5s_c1c"><li class="- topic/li li" data-ofbid="d100703e92__20250121171536">WRI<p class="- topic/p p" data-ofbid="d100703e94__20250121171536">负责记录 <strong class="+ topic/ph hi-d/b ph b">硬件可监测</strong> 到的 Reboot 原因，如过温保护、看门狗复位、外部输入复位等。</p></li><li class="- topic/li li" data-ofbid="d100703e99__20250121171536">SYS_BAK<p class="- topic/p p" data-ofbid="d100703e101__20250121171536">负责记录 <strong class="+ topic/ph hi-d/b ph b">软件可监测</strong> 到的 Reboot 原因，如 Suspend、Panic、进入烧写模式、正常重启等。</p></li></ol>
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<p class="- topic/p p" data-ofbid="d100703e107__20250121171536">关于 Reboot 原因，梳理分类如下：</p>
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<figure class="- topic/fig fig fignone" id="rtc_key_procedures__fig_wdz_bvs_c1c" data-ofbid="rtc_key_procedures__fig_wdz_bvs_c1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="rtc_key_procedures__image_p1w_z5s_c1c" src="../../../images/boot/reboot_reason.png" width="576" alt="reboot_reason"/></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">各种情况的 reason 梳理</span></figcaption></figure>
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<div class="- topic/note note tip note_tip" id="rtc_key_procedures__note_ntl_bvs_c1c" data-ofbid="rtc_key_procedures__note_ntl_bvs_c1c"><span class="note__title">提示：</span>
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<p class="- topic/p p" data-ofbid="d100703e120__20250121171536">其中“外部 IO 复位”指常用的 Reset 按键。</p>
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</div>
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<div class="- topic/p p" data-ofbid="d100703e124__20250121171536">定义 <strong class="+ topic/ph hi-d/b ph b">SYS_BAK0 寄存器（4~7bit）</strong> 的值如下：（详见
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include/linux/reboot-reason.h）<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_key_procedures__codeblock_zdl_53t_c1c" data-ofbid="rtc_key_procedures__codeblock_zdl_53t_c1c"><strong class="hl-keyword">enum</strong> aic_reboot_reason {
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REBOOT_REASON_COLD = <span class="hl-number">0</span>,
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REBOOT_REASON_CMD_REBOOT = <span class="hl-number">1</span>,
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REBOOT_REASON_CMD_SHUTDOWN = <span class="hl-number">2</span>,
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REBOOT_REASON_SUSPEND = <span class="hl-number">3</span>,
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REBOOT_REASON_UPGRADE = <span class="hl-number">4</span>,
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REBOOT_REASON_FASTBOOT = <span class="hl-number">5</span>,
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<em class="hl-comment">/* Some software exception reason */</em>
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REBOOT_REASON_SW_LOCKUP = <span class="hl-number">8</span>,
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REBOOT_REASON_HW_LOCKUP = <span class="hl-number">9</span>,
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REBOOT_REASON_PANIC = <span class="hl-number">10</span>,
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REBOOT_REASON_RAMDUMP = <span class="hl-number">11</span>,
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<em class="hl-comment">/* Some hardware exception reason */</em>
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REBOOT_REASON_RTC = <span class="hl-number">17</span>,
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REBOOT_REASON_EXTEND = <span class="hl-number">18</span>,
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REBOOT_REASON_DM = <span class="hl-number">19</span>,
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REBOOT_REASON_OTP = <span class="hl-number">20</span>,
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REBOOT_REASON_UNDER_VOL = <span class="hl-number">21</span>,
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};</pre></div>
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<p class="- topic/p p" data-ofbid="d100703e132__20250121171536">针对不同场景，SYS_BAK0 寄存器中的 reason 和 WRI 中的 FLAG 值对应如下：</p>
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<div class="table-container"><table class="- topic/table table frame-all" id="rtc_key_procedures__table_r1w_z5s_c1c" data-ofbid="rtc_key_procedures__table_r1w_z5s_c1c" data-cols="4"><caption></caption><colgroup><col style="width:20.40816326530612%"/><col style="width:36.93877551020408%"/><col style="width:22.244897959183675%"/><col style="width:20.40816326530612%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_key_procedures__table_r1w_z5s_c1c__entry__1">场景</th><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">触发行为</th><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WRI 状态</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">SYS_BAK 状态值</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__1" rowspan="3">
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<p class="- topic/p p" data-ofbid="d100703e155__20250121171536">正常重启</p>
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</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">按 Reset 按键</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">EXT_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">COLD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">shell 中执行 reboot 命令</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WDOG_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">CMD_REBOOT</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">shell 执行 aicupg 命令进入烧写</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WDOG_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">UPGRADE</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__1" rowspan="3">
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<p class="- topic/p p" data-ofbid="d100703e181__20250121171536">正常关机</p>
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</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">长按 PowerOn 按键</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">SYS_POR</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">COLD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">shell 中执行 poweroff 命令</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">SYS_POR</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">CMD_SHUTDOWN</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">进入深度休眠状态</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">SYS_POR</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">SUSPEND</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__1" rowspan="8">
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<p class="- topic/p p" data-ofbid="d100703e207__20250121171536">异常重启</p>
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</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">过温保护</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">OTP</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">COLD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">通过 Jtag 执行 reset 命令</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">DM_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">COLD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">RTC 模块断电</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">RTC_POR</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">COLD</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">内核中发生 SW Lock</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WDOG_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">SW_LOCKUP</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">内核中发生 HW Lock</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WDOG_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">HW_LOCKUP</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">内核中发生 Panic</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WDOG_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">PANIC</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">内核中触发进入 Ramdump</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">WDOG_RST</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">RAMDUMP</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__2">电源电压不稳定</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__3">CMP_RST</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_key_procedures__table_r1w_z5s_c1c__entry__4">COLD</td></tr></tbody></table></div>
|
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<div class="- topic/note note note note_note" id="rtc_key_procedures__note_drb_1vs_c1c" data-ofbid="rtc_key_procedures__note_drb_1vs_c1c"><span class="note__title">注：</span>
|
||
<p class="- topic/p p" data-ofbid="d100703e269__20250121171536">其中<span class="+ topic/ph ui-d/uicontrol ph uicontrol">按 Reset 按键</span>的情况，因为软件来不及设置 BAK，所以是初始值 0 （COLD）。</p>
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