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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/rtc/rtc-common-issues.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div>
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<div class="- topic/body concept/conbody body conbody">
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<section class="- topic/section section" id="rtc_common_issues__rtc" data-ofbid="rtc_common_issues__rtc"><h2 class="- topic/title title sectiontitle">RTC 时间丢失</h2>
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">现象</strong><p class="- topic/p p" data-ofbid="d130524e41__20250123155212">重启后，RTC 时间变成 1970-01-01 00:00:00。</p></div>
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong><div class="- topic/p p" data-ofbid="d130524e47__20250123155212">RTC 需要持续的供电，才能保持住配置的时间信息。可以按照以下流程逐个排查原因：<ol class="- topic/ol ol arabic simple" id="rtc_common_issues__ol_q3h_4wh_bdc" data-ofbid="rtc_common_issues__ol_q3h_4wh_bdc">
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<li class="- topic/li li" data-ofbid="d130524e51__20250123155212">
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<p class="- topic/p p" data-ofbid="d130524e53__20250123155212">确认电源线是否有断开过。</p>
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</li>
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<li class="- topic/li li" data-ofbid="d130524e57__20250123155212">
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<p class="- topic/p p" data-ofbid="d130524e59__20250123155212">确认是否安装有电池。</p>
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</li>
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<li class="- topic/li li" data-ofbid="d130524e63__20250123155212">
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<p class="- topic/p p" data-ofbid="d130524e65__20250123155212">如有安装电池，确认电池的电量是否充足。</p>
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</li>
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</ol></div></div>
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</section>
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<section class="- topic/section section" id="rtc_common_issues__id4" data-ofbid="rtc_common_issues__id4"><h2 class="- topic/title title sectiontitle">RTC 时间有误差</h2>
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">现象</strong><p class="- topic/p p" data-ofbid="d130524e79__20250123155212">RTC 模块的设计精度是 2 秒 / 3 天，即在长时间运行后，如果误差超过这个范围，说明 RTC 时间的误差需要校准。</p></div>
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<div class="- topic/div div"><strong class="+ topic/ph hi-d/b ph b">解决方法</strong><p class="- topic/p p" data-ofbid="d130524e85__20250123155212">实测 32K 晶振的时钟频率，将频率值填入 DTS 的参数 <code class="+ topic/ph pr-d/codeph ph codeph">clock-rate</code>，详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-config-guide.html#rtc_configuration__table_zjx_1ss_c1c">RTC 自定义参数</a>
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。</p><p class="- topic/p p" data-ofbid="d130524e94__20250123155212">同时，查看 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-debug-guide.html#rtc_debug_guide__li_sysfs_status">Sysfs
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节点状态信息</a> 中的 status 节点信息，确认校准值的计算正确。</p></div>
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</section>
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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="#rtc_common_issues__rtc" data-tocid="rtc_common_issues__rtc">RTC 时间丢失</a></div></li><li class="section-item"><div class="section-title"><a href="#rtc_common_issues__id4" data-tocid="rtc_common_issues__id4">RTC 时间有误差</a></div></li></ul></div>
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