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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-debug-guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">18 Dec 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d340464e23__20250121171902">本节介绍 RTC 调试流程。</p><section class="- topic/section section" id="rtc_debug_guide__section_qnm_1d5_mdc" data-ofbid="rtc_debug_guide__section_qnm_1d5_mdc"><h2 class="- topic/title title sectiontitle">打开调试开关</h2>
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<ol class="- topic/ol ol" id="rtc_debug_guide__ol_pxc_yjz_sdc" data-ofbid="rtc_debug_guide__ol_pxc_yjz_sdc"><li class="- topic/li li" data-ofbid="d340464e31__20250121171902">
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<div class="- topic/div div">
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<div class="- topic/p p" data-ofbid="d340464e35__20250121171902">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_debug_guide__codeblock_wg1_3ml_sdc" data-ofbid="rtc_debug_guide__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
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<p class="- topic/p p" data-ofbid="d340464e40__20250121171902">或使用简写命令</p>
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<div class="- topic/p p" data-ofbid="d340464e43__20250121171902">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_uss_hml_sdc" data-ofbid="rtc_debug_guide__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="d340464e50__20250121171902">
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<div class="- topic/p p" data-ofbid="d340464e52__20250121171902">在内核配置界面，按如下选择，打开调试开关：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_fzw_kqt_c1c" data-ofbid="rtc_debug_guide__codeblock_fzw_kqt_c1c">Linux
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Kernel hacking
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ArtInChip Debug
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[*] RTC driver debug</pre></div>
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<div class="- topic/p p" data-ofbid="d340464e57__20250121171902">打开 DEBUG 选项后：<ul class="- topic/ul ul" id="rtc_debug_guide__ol_ucp_mss_c1c" data-ofbid="rtc_debug_guide__ol_ucp_mss_c1c"><li class="- topic/li li" data-ofbid="d340464e60__20250121171902">
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<p class="- topic/p p" data-ofbid="d340464e62__20250121171902">驱动以<code class="+ topic/ph pr-d/codeph ph codeph">-O0</code> 编译。</p>
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</li><li class="- topic/li li" data-ofbid="d340464e68__20250121171902">
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<p class="- topic/p p" data-ofbid="d340464e70__20250121171902"><span class="+ topic/keyword pr-d/parmname keyword parmname">pr_dbg()</span> 和 <span class="+ topic/keyword pr-d/parmname keyword parmname">dev_dbg()</span> 调试信息会被编译。</p>
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<div class="- topic/p p" id="rtc_debug_guide__p_wvf_n3w_mdc" data-ofbid="rtc_debug_guide__p_wvf_n3w_mdc">在系统运行时，如果要打印 <span class="+ topic/keyword pr-d/parmname keyword parmname">pr_dbg()</span> 和
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<span class="+ topic/keyword pr-d/parmname keyword parmname">dev_dbg()</span> 信息，还需要调整 <span class="+ topic/keyword pr-d/parmname keyword parmname">loglevel</span> 为
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8，可以通过以下两种方式实现：<ul class="- topic/ul ul" id="rtc_debug_guide__ol_vcp_mss_c1c" data-ofbid="rtc_debug_guide__ol_vcp_mss_c1c"><li class="- topic/li li" data-ofbid="d340464e90__20250121171902">
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<p class="- topic/p p" data-ofbid="d340464e92__20250121171902">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中修改
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<span class="+ topic/keyword pr-d/parmname keyword parmname">bootargs</span>，增加
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<span class="+ topic/keyword pr-d/parmname keyword parmname">“loglevel=8”</span></p>
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</li><li class="- topic/li li" data-ofbid="d340464e103__20250121171902">
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<div class="- topic/p p" data-ofbid="d340464e105__20250121171902">在板子启动到 Linux Shell
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后，执行下列命令：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__pre_wcp_mss_c1c" data-ofbid="rtc_debug_guide__pre_wcp_mss_c1c">echo8 > /proc/sys/kernel/printk</pre></div>
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</li></ul></div>
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</li></ul></div>
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</li></ol>
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</section><section class="- topic/section section" id="rtc_debug_guide__section_sbx_xc5_mdc" data-ofbid="rtc_debug_guide__section_sbx_xc5_mdc"><h2 class="- topic/title title sectiontitle">Sysfs 节点</h2>
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<div class="- topic/p p" data-ofbid="d340464e118__20250121171902">Linux 内核原生提供一些 RTC 的 Sysfs 节点，可以用来获取（只读）时间、范围等信息。<ol class="- topic/ol ol" data-ofbid="d340464e120__20250121171902"><li class="- topic/li li" id="rtc_debug_guide__li_sysfs_status" data-ofbid="rtc_debug_guide__li_sysfs_status"><strong class="+ topic/ph hi-d/b ph b">状态信息</strong><div class="- topic/p p" data-ofbid="d340464e124__20250121171902">
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<ol class="- topic/ol ol" type="a" id="rtc_debug_guide__ol_vtv_3kz_sdc" data-ofbid="rtc_debug_guide__ol_vtv_3kz_sdc"><li class="- topic/li li" data-ofbid="d340464e127__20250121171902">在 <span class="+ topic/ph sw-d/filepath ph filepath">/sys/class/rtc/</span> 目录中查找系统中的 RTC
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设备：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_m2y_wss_c1c" data-ofbid="rtc_debug_guide__codeblock_m2y_wss_c1c">ls /sys/class/rtc/rtc0/</pre><div class="- topic/p p" data-ofbid="d340464e134__20250121171902">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_prr_jkz_sdc" data-ofbid="rtc_debug_guide__codeblock_prr_jkz_sdc">date hctosys range time
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dev max_user_freq since_epoch uevent
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device name subsystem</pre></div></li><li class="- topic/li li" data-ofbid="d340464e138__20250121171902">
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<div class="- topic/p p" data-ofbid="d340464e140__20250121171902">选择一个 RTC 设备并进入其目录：<ul class="- topic/ul ul" id="rtc_debug_guide__ul_gtf_pkz_sdc" data-ofbid="rtc_debug_guide__ul_gtf_pkz_sdc"><li class="- topic/li li" data-ofbid="d340464e143__20250121171902">示例 1：查看 <code class="+ topic/ph pr-d/codeph ph codeph">time</code>
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信息<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_vwb_kkz_sdc" data-ofbid="rtc_debug_guide__codeblock_vwb_kkz_sdc">cat /sys/class/rtc/rtc0/time</pre><div class="- topic/p p" data-ofbid="d340464e150__20250121171902">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_qv3_4kz_sdc" data-ofbid="rtc_debug_guide__codeblock_qv3_4kz_sdc"><span class="hl-number">00</span>:<span class="hl-number">00</span>:<span class="hl-number">00</span></pre></div></li><li class="- topic/li li" data-ofbid="d340464e154__20250121171902">示例 2：查看 <code class="+ topic/ph pr-d/codeph ph codeph">date</code>
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信息：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_sbs_4kz_sdc" data-ofbid="rtc_debug_guide__codeblock_sbs_4kz_sdc">cat /sys/class/rtc/rtc0/date</pre><div class="- topic/p p" data-ofbid="d340464e161__20250121171902">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_c3x_rkz_sdc" data-ofbid="rtc_debug_guide__codeblock_c3x_rkz_sdc"><span class="hl-number">1970</span>-<span class="hl-number">01</span>-<span class="hl-number">01</span></pre></div></li></ul></div>
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</li><li class="- topic/li li" data-ofbid="d340464e166__20250121171902">
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||
<div class="- topic/p p" data-ofbid="d340464e168__20250121171902">在 RTC 驱动初始化成功后，会在 Sysfs 中注册生成一个 <code class="+ topic/ph pr-d/codeph ph codeph">status</code>
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节点，其中打印了当前的 RTC 配置及状态信息。例如查看
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<span class="+ topic/ph sw-d/filepath ph filepath">/sys/devices/platform/soc/19030000.rtc</span>
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||
目录中的状态信息：<ol class="- topic/ol ol" type="i" id="rtc_debug_guide__ol_lx1_clz_sdc" data-ofbid="rtc_debug_guide__ol_lx1_clz_sdc"><li class="- topic/li li" data-ofbid="d340464e177__20250121171902">
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<div class="- topic/p p" data-ofbid="d340464e179__20250121171902">进入
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<span class="+ topic/ph sw-d/filepath ph filepath">/sys/devices/platform/soc/19030000.rtc/</span>
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目录：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_tgr_dlz_sdc" data-ofbid="rtc_debug_guide__codeblock_tgr_dlz_sdc">cd /sys/devices/platform/soc/<span class="hl-number">19030000.</span>rtc/</pre></div>
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||
</li><li class="- topic/li li" data-ofbid="d340464e188__20250121171902">
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||
<div class="- topic/p p" data-ofbid="d340464e190__20250121171902">执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">cat status</span>
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命令查看状态信息，示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_trp_h4y_c1c" data-ofbid="rtc_debug_guide__codeblock_trp_h4y_c1c">In RTC V1.<span class="hl-number">00</span>:
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Module Enable: <span class="hl-number">1</span>
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||
Alarm Enable: <span class="hl-number">0</span>, Output alarm IO: <span class="hl-number">2</span>/<span class="hl-number">1</span>, Output <span class="hl-number">32</span>K: <span class="hl-number">0</span>
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||
Clock rate: <span class="hl-number">32787</span>, Driver: <span class="hl-number">13</span>
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||
Calibration Slow, Value: -<span class="hl-number">608</span></pre></div>
|
||
</li></ol></div>
|
||
</li></ol>
|
||
</div></li><li class="- topic/li li" id="rtc_debug_guide__li_sysfs_drivecap_scan" data-ofbid="rtc_debug_guide__li_sysfs_drivecap_scan"><strong class="+ topic/ph hi-d/b ph b">驱动能力扫描</strong><p class="- topic/p p" data-ofbid="d340464e204__20250121171902">为了节省功耗，可以调低 RTC V1.0 的 32K
|
||
时钟驱动能力，驱动力可调范围为 [0, 15]，值越大功耗越大。</p><div class="- topic/p p" data-ofbid="d340464e206__20250121171902">RTC 驱动提供了一个 Sysfs 节点
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||
<code class="+ topic/ph pr-d/codeph ph codeph">driver_capability</code>，方便用户扫描出最适合的驱动力值。在 RTC
|
||
驱动初始化成功后：<ol class="- topic/ol ol" type="a" id="rtc_debug_guide__ol_o3d_llz_sdc" data-ofbid="rtc_debug_guide__ol_o3d_llz_sdc"><li class="- topic/li li" data-ofbid="d340464e212__20250121171902">进入设备 Sysfs 目录，例如
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">/sys/devices/platform/soc/19030000.rtc/</span>：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_rfn_mlz_sdc" data-ofbid="rtc_debug_guide__codeblock_rfn_mlz_sdc">cd /sys/devices/platform/soc/<span class="hl-number">19030000.</span>rtc/</pre></li><li class="- topic/li li" data-ofbid="d340464e219__20250121171902">
|
||
<div class="- topic/p p" data-ofbid="d340464e221__20250121171902">执行下列命令，读取驱动力节点信息：<div class="- topic/note note note note_note" id="rtc_debug_guide__note_zd1_zss_c1c" data-ofbid="rtc_debug_guide__note_zd1_zss_c1c"><span class="note__title">注：</span>
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||
<p class="- topic/p p" data-ofbid="d340464e225__20250121171902">驱动力扫描的整个过程大约需要 16 秒。</p>
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||
</div><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_imc_plz_sdc" data-ofbid="rtc_debug_guide__codeblock_imc_plz_sdc">cat driver_capability</pre></div>
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||
<div class="- topic/p p" data-ofbid="d340464e231__20250121171902">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__pre_bdp_mss_c1c" data-ofbid="rtc_debug_guide__pre_bdp_mss_c1c">[<span class="hl-number">95.755513</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">0</span> is OK
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||
[<span class="hl-number">97.835482</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">1</span> is OK
|
||
[<span class="hl-number">99.915447</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">2</span> is OK
|
||
[<span class="hl-number">101.995471</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">3</span> is OK
|
||
[<span class="hl-number">104.075494</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">4</span> is OK
|
||
[<span class="hl-number">106.155478</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">5</span> is OK
|
||
[<span class="hl-number">108.235529</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">6</span> is OK
|
||
[<span class="hl-number">110.315497</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">7</span> is OK
|
||
[<span class="hl-number">112.395507</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">8</span> is OK
|
||
[<span class="hl-number">114.475539</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">9</span> is OK
|
||
[<span class="hl-number">116.555492</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">10</span> is OK
|
||
[<span class="hl-number">118.635732</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">11</span> is OK
|
||
[<span class="hl-number">120.715503</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">12</span> is OK
|
||
[<span class="hl-number">122.795466</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">13</span> is OK
|
||
[<span class="hl-number">124.875483</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">14</span> is OK
|
||
[<span class="hl-number">126.955511</span>] <span class="hl-number">32</span>K-clk driver <span class="hl-number">15</span> is OK
|
||
The status of RTC driver:
|
||
Driver <span class="hl-number">0123456789101112131415</span>
|
||
Status OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK OK</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340464e236__20250121171902">
|
||
<p class="- topic/p p" data-ofbid="d340464e238__20250121171902">从扫描结果中，选取一个标注 “OK” 的值，并将其配置到
|
||
<span class="+ topic/keyword pr-d/parmname keyword parmname">:ref:`ref_to_rtc_dts`</span>
|
||
。 </p>
|
||
</li></ol></div></li></ol></div>
|
||
</section><section class="- topic/section section" id="rtc_debug_guide__section_cnr_4c5_mdc" data-ofbid="rtc_debug_guide__section_cnr_4c5_mdc"><h2 class="- topic/title title sectiontitle">hwclock 命令</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d340464e252__20250121171902">Busybox 源码自带一个 <code class="+ topic/ph pr-d/codeph ph codeph">hwclock</code> 工具，用来读取和设置 RTC 时间。用法如下：<ul class="- topic/ul ul" id="rtc_debug_guide__ul_jkd_dmz_sdc" data-ofbid="rtc_debug_guide__ul_jkd_dmz_sdc"><li class="- topic/li li" data-ofbid="d340464e258__20250121171902">
|
||
<div class="- topic/p p" data-ofbid="d340464e260__20250121171902">读取当前 RTC
|
||
时间（不加任何参数时就默认是读取）：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_fm2_2mz_sdc" data-ofbid="rtc_debug_guide__codeblock_fm2_2mz_sdc">hwclock -r</pre></div>
|
||
<div class="- topic/p p" data-ofbid="d340464e265__20250121171902">输出示例如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__pre_sxs_bts_c1c" data-ofbid="rtc_debug_guide__pre_sxs_bts_c1c">Thu Jan <span class="hl-number">100</span>:<span class="hl-number">00</span>:<span class="hl-number">00</span> <span class="hl-number">19700.000000</span> seconds</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340464e270__20250121171902">
|
||
<div class="- topic/p p" data-ofbid="d340464e272__20250121171902">读取当前 RTC
|
||
时间，并加上时区校准：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_cg1_gmz_sdc" data-ofbid="rtc_debug_guide__codeblock_cg1_gmz_sdc">hwclock -ru</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340464e277__20250121171902">
|
||
<div class="- topic/p p" data-ofbid="d340464e279__20250121171902">将当前的系统时间同步设置到
|
||
RTC：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_rbw_gmz_sdc" data-ofbid="rtc_debug_guide__codeblock_rbw_gmz_sdc">hwclock -w</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340464e284__20250121171902">
|
||
<div class="- topic/p p" data-ofbid="d340464e286__20250121171902">将当前的系统时间减去时区值，并同步设置到
|
||
RTC：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_xkz_3mz_sdc" data-ofbid="rtc_debug_guide__codeblock_xkz_3mz_sdc">hwclock -wu</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d340464e291__20250121171902">
|
||
<div class="- topic/p p" data-ofbid="d340464e293__20250121171902">将 RTC
|
||
时间同步到系统时间：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_debug_guide__codeblock_q3h_fmz_sdc" data-ofbid="rtc_debug_guide__codeblock_q3h_fmz_sdc">hwclock -s </pre></div>
|
||
</li></ul></div>
|
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</section></div></article></main></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_debug_guide__section_qnm_1d5_mdc" data-tocid="rtc_debug_guide__section_qnm_1d5_mdc">打开调试开关</a></div></li><li class="section-item"><div class="section-title"><a href="#rtc_debug_guide__section_sbx_xc5_mdc" data-tocid="rtc_debug_guide__section_sbx_xc5_mdc">Sysfs 节点</a></div></li><li class="section-item"><div class="section-title"><a href="#rtc_debug_guide__section_cnr_4c5_mdc" data-tocid="rtc_debug_guide__section_cnr_4c5_mdc">hwclock 命令</a></div></li></ul></div>
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