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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-common-issues.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><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="d334808e32__20250121171840">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="d334808e38__20250121171840">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"><li class="- topic/li li" data-ofbid="d334808e41__20250121171840">
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<p class="- topic/p p" data-ofbid="d334808e43__20250121171840">确认电源线是否有断开过。</p>
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</li><li class="- topic/li li" data-ofbid="d334808e46__20250121171840">
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<p class="- topic/p p" data-ofbid="d334808e48__20250121171840">确认是否安装有电池。</p>
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</li><li class="- topic/li li" data-ofbid="d334808e51__20250121171840">
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<p class="- topic/p p" data-ofbid="d334808e53__20250121171840">如有安装电池，确认电池的电量是否充足。</p>
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</li></ol></div></div>
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</section><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="d334808e65__20250121171840">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="d334808e71__20250121171840">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
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<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-config-guide.html#rtc_configuration__ref-to-lite-rtc-cfg">rtc-config-guide.html#rtc_configuration__ref-to-lite-rtc-cfg</a>。</p></div>
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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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