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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-config-guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">RTC 配置</h1><div class="date inPage">17 Dec 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"><p class="- topic/p p" data-ofbid="d283243e22__20250121171752">本节介绍 RTC 的参数配置。</p><section class="- topic/section section" id="rtc_configuration__section_gm2_db5_mdc" data-ofbid="rtc_configuration__section_gm2_db5_mdc"><h2 class="- topic/title title sectiontitle">内核配置</h2>
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<div class="- topic/p p" data-ofbid="d283243e29__20250121171752">
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<ol class="- topic/ol ol" id="rtc_configuration__ol_vwc_f1s_sdc" data-ofbid="rtc_configuration__ol_vwc_f1s_sdc"><li class="- topic/li li" data-ofbid="d283243e32__20250121171752">
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<div class="- topic/div div">
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<div class="- topic/p p" data-ofbid="d283243e36__20250121171752">在 SDK 根目录下，执行下列命令，进入 kernel
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的功能配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_wg1_3ml_sdc" data-ofbid="rtc_configuration__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
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<p class="- topic/p p" data-ofbid="d283243e41__20250121171752">或使用简写命令</p>
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<div class="- topic/p p" data-ofbid="d283243e44__20250121171752">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_uss_hml_sdc" data-ofbid="rtc_configuration__codeblock_uss_hml_sdc">make km</pre>
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</div>
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</div>
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</li><li class="- topic/li li" data-ofbid="d283243e51__20250121171752">
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<div class="- topic/p p" data-ofbid="d283243e53__20250121171752">在内核配置界面，按如下选择打开 RTC
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驱动：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__pre_jcx_zrs_c1c" data-ofbid="rtc_configuration__pre_jcx_zrs_c1c">Linux
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Device Drivers
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[*] Real Time Clock
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[*] ArtInChip Soc RTC</pre></div>
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</li></ol>
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</div>
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</section><section class="- topic/section section" id="rtc_configuration__section_j1r_y15_mdc" data-ofbid="rtc_configuration__section_j1r_y15_mdc"><h2 class="- topic/title title sectiontitle">配置 DTS 参数</h2>
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<div class="- topic/p p" data-ofbid="d283243e65__20250121171752">RTC 驱动支持从 DTS 中配置的自定义参数如下表所示：<div class="- topic/note note note note_note" id="rtc_configuration__note_cs1_lc5_mdc" data-ofbid="rtc_configuration__note_cs1_lc5_mdc"><span class="note__title">注：</span> <code class="+ topic/ph pr-d/codeph ph codeph">aic,alarm-io-output</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">aic,32k-io-output</code>
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共用一个 IO 输出，只能二选一。</div></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="rtc_configuration__table_zjx_1ss_c1c" data-ofbid="rtc_configuration__table_zjx_1ss_c1c" data-cols="5"><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">RTC 自定义参数</span></caption><colgroup><col style="width:16.186252771618626%"/><col style="width:12.749445676274945%"/><col style="width:11.086474501108649%"/><col style="width:14.412416851441243%"/><col style="width:45.565410199556545%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_configuration__table_zjx_1ss_c1c__entry__1">参数名称</th><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_configuration__table_zjx_1ss_c1c__entry__2">适用版本</th><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_configuration__table_zjx_1ss_c1c__entry__3">类型</th><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_configuration__table_zjx_1ss_c1c__entry__4">取值范围</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_configuration__table_zjx_1ss_c1c__entry__5">功能说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__1">aic,alarm-io-output</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__2">V0.1/V1.0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__3">Boolean</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__4">有 - 1，无 - 0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__5">是否使能 alarm 的 IO 输出功能</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__1">aic,32k-io-output</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__2">V1.0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__3">Boolean</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__4">有 - 1，无 - 0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__5">是否使能 32K 时钟输出功能</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__1">clock-rate</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__2">V1.0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__3">Integer</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__4">3276800±3196</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_configuration__table_zjx_1ss_c1c__entry__5">时钟源的实测频率值*100，用于时钟校准。<p class="- topic/p p" data-ofbid="d283243e130__20250121171752">这种取值方式可提高校准的精度，使得校准可以精确到 0.03
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Hz。</p></td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_configuration__table_zjx_1ss_c1c__entry__1">aic,clock-driver</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_configuration__table_zjx_1ss_c1c__entry__2">V1.0</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_configuration__table_zjx_1ss_c1c__entry__3">Integer</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_configuration__table_zjx_1ss_c1c__entry__4">[0, 15]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_configuration__table_zjx_1ss_c1c__entry__5">Clock 驱动能力，数值越小越省功耗<p class="- topic/p p" data-ofbid="d283243e143__20250121171752">需要通过一个 Sysfs 节点 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-debug-guide.html#rtc_debug_guide__li_sysfs_drivecap_scan">驱动能力扫描</a>
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来获得取值。</p></td></tr></tbody></table></div>
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<div class="- topic/p p" data-ofbid="d283243e150__20250121171752"><strong class="+ topic/ph hi-d/b ph b">D211 配置</strong><ul class="- topic/ul ul" id="rtc_configuration__ul_ylh_bb5_mdc" data-ofbid="rtc_configuration__ul_ylh_bb5_mdc"><li class="- topic/li li" data-ofbid="d283243e154__20250121171752">
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<div class="- topic/p p" data-ofbid="d283243e156__20250121171752"><span class="+ topic/ph sw-d/filepath ph filepath">common/d211.dtsi</span>
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中的参数配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_tgp_2ss_c1c" data-ofbid="rtc_configuration__codeblock_tgp_2ss_c1c">rtc: rtc@<span class="hl-number">19030000</span> {
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compatible = <span class="hl-string">"artinchip,aic-rtc-v1.0"</span>;
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reg = <<span class="hl-number">0x0</span> <span class="hl-number">0x19030000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x1000</span>>;
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interrupts-extended = <&plic0 <span class="hl-number">50</span> IRQ_TYPE_LEVEL_HIGH>;
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clocks = <&cmu CLK_RTC>;
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resets = <&rst RESET_RTC>;
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};</pre></div>
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</li><li class="- topic/li li" data-ofbid="d283243e163__20250121171752">
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<div class="- topic/p p" data-ofbid="d283243e165__20250121171752"><span class="+ topic/ph sw-d/filepath ph filepath">xxx/board.dts</span>
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中的参数配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_amt_2ss_c1c" data-ofbid="rtc_configuration__codeblock_amt_2ss_c1c">&rtc {
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aic,alarm-io-output;
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clock-rate = <<span class="hl-number">3276851</span>>;
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aic,clock-driver = <<span class="hl-number">13</span>>;
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status = <span class="hl-string">"okay"</span>;
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};</pre></div>
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</li></ul></div>
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</section><section class="- topic/section section" id="rtc_configuration__section_t1l_v15_mdc" data-ofbid="rtc_configuration__section_t1l_v15_mdc"><h2 class="- topic/title title sectiontitle">配置时区</h2>
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<div class="- topic/p p" data-ofbid="d283243e178__20250121171752">Luban SDK 提供了时区管理功能，默认配置时区为 <code class="+ topic/ph pr-d/codeph ph codeph">Asia/Shanghai</code>，即中国的 +8 时区。
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按照下列流程，可以配置和管理时钟：<ol class="- topic/ol ol" id="rtc_configuration__ul_nbz_jb5_mdc" data-ofbid="rtc_configuration__ul_nbz_jb5_mdc"><li class="- topic/li li" data-ofbid="d283243e184__20250121171752">在 Luban 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make
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menuconfig</span>，进入功能配置界面，选择时区配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__pre_ahy_hss_c1c" data-ofbid="rtc_configuration__pre_ahy_hss_c1c">System configuration
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(Asia/Shanghai) <strong class="hl-keyword">default</strong> local time</pre></li><li class="- topic/li li" data-ofbid="d283243e191__20250121171752">
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<div class="- topic/p p" data-ofbid="d283243e193__20250121171752">执行下列 Shell
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命令，查看系统中是否有时区配置。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_e1w_4b5_mdc" data-ofbid="rtc_configuration__codeblock_e1w_4b5_mdc">date</pre><ul class="- topic/ul ul" id="rtc_configuration__ul_cpj_nb5_mdc" data-ofbid="rtc_configuration__ul_cpj_nb5_mdc"><li class="- topic/li li" data-ofbid="d283243e198__20250121171752">如果系统输出中包含 “UTC”
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字样，表示未配置时区，示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_y3l_j1s_sdc" data-ofbid="rtc_configuration__codeblock_y3l_j1s_sdc">Tue Jan <span class="hl-number">601</span>:<span class="hl-number">41</span>:<span class="hl-number">27</span> UTC <span class="hl-number">1970</span></pre><p class="- topic/p p" data-ofbid="d283243e202__20250121171752">此时，RTC
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时间和系统时间（<span class="+ topic/keyword sw-d/cmdname keyword cmdname">date</span> 命令的输出）一致。</p></li><li class="- topic/li li" data-ofbid="d283243e207__20250121171752">如果系统输出中包含 “CST” 字样，表示已经配置了 +8
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时区：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_e4z_j1s_sdc" data-ofbid="rtc_configuration__codeblock_e4z_j1s_sdc">Tue Jan <span class="hl-number">601</span>:<span class="hl-number">41</span>:<span class="hl-number">27</span> CST <span class="hl-number">1970</span></pre><div class="- topic/p p" data-ofbid="d283243e211__20250121171752">此时
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RTC
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时间和系统时间会出现一个时区差：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__pre_chy_hss_c1c" data-ofbid="rtc_configuration__pre_chy_hss_c1c">系统时间 = RTC 时间 + 时区</pre></div><div class="- topic/p p" data-ofbid="d283243e215__20250121171752">以
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+8 时区为例，通过 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-debug-guide.html#rtc_debug_guide__section_cnr_4c5_mdc">hwclock 命令</a>
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可以查看时区差：<ul class="- topic/ul ul" id="rtc_configuration__ul_qbc_1bs_sdc" data-ofbid="rtc_configuration__ul_qbc_1bs_sdc"><li class="- topic/li li" data-ofbid="d283243e222__20250121171752">系统时间：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__pre_dhy_hss_c1c" data-ofbid="rtc_configuration__pre_dhy_hss_c1c">date</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_tr1_x1s_sdc" data-ofbid="rtc_configuration__codeblock_tr1_x1s_sdc">Tue Jan <span class="hl-number">601</span>:<span class="hl-number">49</span>:<span class="hl-number">53</span> CST <span class="hl-number">1970</span></pre></li><li class="- topic/li li" data-ofbid="d283243e228__20250121171752">
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<div class="- topic/p p" data-ofbid="d283243e230__20250121171752">原始 RTC
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时间<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_xxh_cbs_sdc" data-ofbid="rtc_configuration__codeblock_xxh_cbs_sdc">hwclock </pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_pqb_bbs_sdc" data-ofbid="rtc_configuration__codeblock_pqb_bbs_sdc">Mon Jan <span class="hl-number">517</span>:<span class="hl-number">49</span>:<span class="hl-number">17</span> <span class="hl-number">19700.000000</span> seconds</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d283243e237__20250121171752">RTC 时间 +
|
||
时区，和系统时间一致<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_whk_dbs_sdc" data-ofbid="rtc_configuration__codeblock_whk_dbs_sdc">hwclock -u</pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_configuration__codeblock_mwn_fbs_sdc" data-ofbid="rtc_configuration__codeblock_mwn_fbs_sdc">Tue Jan <span class="hl-number">601</span>:<span class="hl-number">49</span>:<span class="hl-number">20</span> <span class="hl-number">19700.000000</span> seconds</pre><p class="- topic/p p" data-ofbid="d283243e243__20250121171752">在打开时区的情况下，使用
|
||
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">hwclock -wu</span> 命令可以从系统时间同步到 RTC
|
||
时间的设置。</p><p class="- topic/p p" data-ofbid="d283243e248__20250121171752">查看 RTC 时间的方式也应该加参数
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">-u</code>，指示 hwclock 工具 RTC 中保存的是 UTC
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时间。</p></li></ul></div></li></ul></div>
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