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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-interface-design.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">接口设计</h1><div class="date inPage">15 Jul 2024</div><div style="color: gray;">
Read time: 4 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d343680e22__20250121172118">以下接口是 Linux RTC 子系统需要的标准接口。</p><section class="- topic/section section" id="rtc_interface_design__section_wck_2ws_c1c" data-ofbid="rtc_interface_design__section_wck_2ws_c1c"><h2 class="- topic/title title sectiontitle">外部接口</h2>
<div class="- topic/p p" data-ofbid="d343680e29__20250121172118">Linux
对用户态提供了一组 RTC 的 ioctl 接口，用户态可以通过设备节点/dev/rtc0 来访问：（详见 include/upai/linux/rtc.h）<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_interface_design__codeblock_jdf_gws_c1c" data-ofbid="rtc_interface_design__codeblock_jdf_gws_c1c">#<span class="hl-directive">define</span> RTC_AIE_ON _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x01</span>) <em class="hl-comment">/* Alarm int. enable on */</em>
#<span class="hl-directive">define</span> RTC_AIE_OFF _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x02</span>) <em class="hl-comment">/* ... off */</em>
#<span class="hl-directive">define</span> RTC_UIE_ON _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x03</span>) <em class="hl-comment">/* Update int. enable on */</em>
#<span class="hl-directive">define</span> RTC_UIE_OFF _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x04</span>) <em class="hl-comment">/* ... off */</em>
#<span class="hl-directive">define</span> RTC_PIE_ON _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x05</span>) <em class="hl-comment">/* Periodic int. enable on */</em>
#<span class="hl-directive">define</span> RTC_PIE_OFF _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x06</span>) <em class="hl-comment">/* ... off */</em>
#<span class="hl-directive">define</span> RTC_WIE_ON _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x0f</span>) <em class="hl-comment">/* Watchdog int. enable on */</em>
#<span class="hl-directive">define</span> RTC_WIE_OFF _IO(<span class="hl-string">'p'</span>, <span class="hl-number">0x10</span>) <em class="hl-comment">/* ... off */</em>
#<span class="hl-directive">define</span> RTC_ALM_SET _IOW(<span class="hl-string">'p'</span>, <span class="hl-number">0x07</span>, <strong class="hl-keyword">struct</strong> rtc_time) <em class="hl-comment">/* Set alarm time */</em>
#<span class="hl-directive">define</span> RTC_ALM_READ _IOR(<span class="hl-string">'p'</span>, <span class="hl-number">0x08</span>, <strong class="hl-keyword">struct</strong> rtc_time) <em class="hl-comment">/* Read alarm time */</em>
#<span class="hl-directive">define</span> RTC_RD_TIME _IOR(<span class="hl-string">'p'</span>, <span class="hl-number">0x09</span>, <strong class="hl-keyword">struct</strong> rtc_time) <em class="hl-comment">/* Read RTC time */</em>
#<span class="hl-directive">define</span> RTC_SET_TIME _IOW(<span class="hl-string">'p'</span>, <span class="hl-number">0x0a</span>, <strong class="hl-keyword">struct</strong> rtc_time) <em class="hl-comment">/* Set RTC time */</em>
#<span class="hl-directive">define</span> RTC_IRQP_READ _IOR(<span class="hl-string">'p'</span>, <span class="hl-number">0x0b</span>, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong>) <em class="hl-comment">/* Read IRQ rate */</em>
#<span class="hl-directive">define</span> RTC_IRQP_SET _IOW(<span class="hl-string">'p'</span>, <span class="hl-number">0x0c</span>, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong>) <em class="hl-comment">/* Set IRQ rate */</em>
#<span class="hl-directive">define</span> RTC_EPOCH_READ _IOR(<span class="hl-string">'p'</span>, <span class="hl-number">0x0d</span>, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong>) <em class="hl-comment">/* Read epoch */</em>
#<span class="hl-directive">define</span> RTC_EPOCH_SET _IOW(<span class="hl-string">'p'</span>, <span class="hl-number">0x0e</span>, <strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong>) <em class="hl-comment">/* Set epoch */</em>
#<span class="hl-directive">define</span> RTC_WKALM_SET _IOW(<span class="hl-string">'p'</span>, <span class="hl-number">0x0f</span>, <strong class="hl-keyword">struct</strong> rtc_wkalrm)<em class="hl-comment">/* Set wakeup alarm*/</em>
#<span class="hl-directive">define</span> RTC_WKALM_RD _IOR(<span class="hl-string">'p'</span>, <span class="hl-number">0x10</span>, <strong class="hl-keyword">struct</strong> rtc_wkalrm)<em class="hl-comment">/* Get wakeup alarm*/</em>
#<span class="hl-directive">define</span> RTC_PLL_GET _IOR(<span class="hl-string">'p'</span>, <span class="hl-number">0x11</span>, <strong class="hl-keyword">struct</strong> rtc_pll_info) <em class="hl-comment">/* Get PLL correction */</em>
#<span class="hl-directive">define</span> RTC_PLL_SET _IOW(<span class="hl-string">'p'</span>, <span class="hl-number">0x12</span>, <strong class="hl-keyword">struct</strong> rtc_pll_info) <em class="hl-comment">/* Set PLL correction */</em></pre></div>
<p class="- topic/p p" data-ofbid="d343680e34__20250121172118"><a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-demo.html">Demo</a> 就是调用的这些接口完成 alarm 配置，以及 hwclock 工具也是调用上述接口。</p>
</section><section class="- topic/section section" id="rtc_interface_design__section_q4p_kws_c1c" data-ofbid="rtc_interface_design__section_q4p_kws_c1c"><h2 class="- topic/title title sectiontitle">RTC 相关的内部接口</h2>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_srz_jws_c1c" data-ofbid="rtc_interface_design__table_srz_jws_c1c" data-cols="2"><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">aic_rtc_read_time</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_srz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_srz_jws_c1c__entry__2">static int aic_rtc_read_time(struct device *dev, struct rtc_time
*tm)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_srz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_srz_jws_c1c__entry__2">读取当前的 RTC 时间</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_srz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_srz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_sk2_tgj_bcc" data-ofbid="rtc_interface_design__ul_sk2_tgj_bcc"><li class="- topic/li li" data-ofbid="d343680e69__20250121172118">dev - 指向 RTC 设备的指针 </li><li class="- topic/li li" data-ofbid="d343680e71__20250121172118">tm - 用于存放获取到的时间信息</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_srz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_srz_jws_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_srz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_srz_jws_c1c__entry__2">-</td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_trz_jws_c1c" data-ofbid="rtc_interface_design__table_trz_jws_c1c" data-cols="2"><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"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_rtc_set_time</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_trz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_trz_jws_c1c__entry__2">static int aic_rtc_set_time(struct device *dev, struct rtc_time
*tm)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_trz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_trz_jws_c1c__entry__2">设置 RTC 时间</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_trz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_trz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_b25_tgj_bcc" data-ofbid="rtc_interface_design__ul_b25_tgj_bcc"><li class="- topic/li li" data-ofbid="d343680e109__20250121172118">dev - 指向 RTC 设备的指针 </li><li class="- topic/li li" data-ofbid="d343680e111__20250121172118">tm - 需要设置的时间信息</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_trz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_trz_jws_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_trz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_trz_jws_c1c__entry__2">更新 RTC 控制器的秒数，需要先暂停 RTC 计数，设置完秒数，再使能 RTC。</td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_urz_jws_c1c" data-ofbid="rtc_interface_design__table_urz_jws_c1c" data-cols="2"><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"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_rtc_read_alarm</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_urz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_urz_jws_c1c__entry__2">static int aic_rtc_read_alarm(struct device *dev, struct
rtc_wkalrm *alarm)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_urz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_urz_jws_c1c__entry__2">读取当前的 Alarm 状态信息</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_urz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_urz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_crh_5gj_bcc" data-ofbid="rtc_interface_design__ul_crh_5gj_bcc"><li class="- topic/li li" data-ofbid="d343680e149__20250121172118">dev - 指向 RTC 设备的指针 </li><li class="- topic/li li" data-ofbid="d343680e151__20250121172118">alarm - 用于保存读取到的当前 Alarm 信息，包括下一次超时时间和超时状态</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_urz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_urz_jws_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_urz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_urz_jws_c1c__entry__2">-</td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_vrz_jws_c1c" data-ofbid="rtc_interface_design__table_vrz_jws_c1c" data-cols="2"><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"> 4</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_rtc_set_alarm</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_vrz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_vrz_jws_c1c__entry__2">static int aic_rtc_set_alarm(struct device *dev, struct
rtc_wkalrm *alarm)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_vrz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_vrz_jws_c1c__entry__2">设置一个 Alarm，并使能 Alarm 中断</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_vrz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_vrz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_gn5_5gj_bcc" data-ofbid="rtc_interface_design__ul_gn5_5gj_bcc"><li class="- topic/li li" data-ofbid="d343680e189__20250121172118">dev - 指向 RTC 设备的指针 </li><li class="- topic/li li" data-ofbid="d343680e191__20250121172118">alarm - 需要设置的 Alarm 信息</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_vrz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_vrz_jws_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_vrz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_vrz_jws_c1c__entry__2">-</td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_wrz_jws_c1c" data-ofbid="rtc_interface_design__table_wrz_jws_c1c" data-cols="2"><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"> 5</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_rtc_alarm_irq_enable</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_wrz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_wrz_jws_c1c__entry__2">static int aic_rtc_alarm_irq_enable(struct device *dev, unsigned
int enabled)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_wrz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_wrz_jws_c1c__entry__2">开关 Alarm 中断</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_wrz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_wrz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_gwf_vgj_bcc" data-ofbid="rtc_interface_design__ul_gwf_vgj_bcc"><li class="- topic/li li" data-ofbid="d343680e230__20250121172118">dev - 指向 RTC 设备的指针 </li><li class="- topic/li li" data-ofbid="d343680e232__20250121172118">enabled - 使能标记</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_wrz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_wrz_jws_c1c__entry__2">0，成功</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_wrz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_wrz_jws_c1c__entry__2">-</td></tr></tbody></table></div>
</section><section class="- topic/section section" id="rtc_interface_design__section_j2s_mws_c1c" data-ofbid="rtc_interface_design__section_j2s_mws_c1c"><h2 class="- topic/title title sectiontitle">系统状态备份相关的内部接口</h2>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_xrz_jws_c1c" data-ofbid="rtc_interface_design__table_xrz_jws_c1c" data-cols="2"><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"> 6</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_rtc_set_bak</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_xrz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_xrz_jws_c1c__entry__2">void aic_rtc_set_bak(u32 offset, u32 mask, u32 shift, u32
val)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_xrz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_xrz_jws_c1c__entry__2">设置 BAK 寄存器中某几个（连续的）bit</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_xrz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_xrz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_lzp_vgj_bcc" data-ofbid="rtc_interface_design__ul_lzp_vgj_bcc"><li class="- topic/li li" data-ofbid="d343680e275__20250121172118">offset - 寄存器的偏移地址，取值范围：0、4、8、12</li><li class="- topic/li li" data-ofbid="d343680e277__20250121172118">mask - 待设置的 bit 掩码 </li><li class="- topic/li li" data-ofbid="d343680e279__20250121172118">shift - 待设置的 bit 需要左移多少位 </li><li class="- topic/li li" data-ofbid="d343680e281__20250121172118">val - 待设置的实际值</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_xrz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_xrz_jws_c1c__entry__2">无</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_xrz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_xrz_jws_c1c__entry__2">设置过程：先将 val 左移，然后再做掩码处理</td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_yrz_jws_c1c" data-ofbid="rtc_interface_design__table_yrz_jws_c1c" data-cols="2"><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"> 7</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_rtc_get_bak</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_yrz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_yrz_jws_c1c__entry__2">u32 aic_rtc_get_bak(u32 offset, u32 mask, u32 shift)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_yrz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_yrz_jws_c1c__entry__2">读取 BAK 寄存器中某几个（连续的）bit</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_yrz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_yrz_jws_c1c__entry__2">
<ul class="- topic/ul ul" id="rtc_interface_design__ul_pbm_wgj_bcc" data-ofbid="rtc_interface_design__ul_pbm_wgj_bcc"><li class="- topic/li li" data-ofbid="d343680e319__20250121172118">offset - 寄存器的偏移地址，取值范围：0、4、8、12</li><li class="- topic/li li" data-ofbid="d343680e321__20250121172118">mask - 待读取的 bit 掩码 </li><li class="- topic/li li" data-ofbid="d343680e323__20250121172118">shift - 待读取的 bit 需要右移多少位</li></ul>
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_yrz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_yrz_jws_c1c__entry__2">实际读取到的寄存器值</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_yrz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_yrz_jws_c1c__entry__2">读取过程：先将读取到的寄存器当前值做掩码处理，然后再右移</td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_zrz_jws_c1c" data-ofbid="rtc_interface_design__table_zrz_jws_c1c" data-cols="2"><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"> 8</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_set_software_reboot_reason</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_zrz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_zrz_jws_c1c__entry__2">void aic_set_software_reboot_reason(enum aic_reboot_reason
reason)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_zrz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_zrz_jws_c1c__entry__2">设置 reason 到 SYS_BAK 寄存器</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_zrz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_zrz_jws_c1c__entry__2">reason - aic_reboot_reason 类型的启动原因</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_zrz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_zrz_jws_c1c__entry__2">无</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_zrz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_zrz_jws_c1c__entry__2">aic_reboot_reason 详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-key-procedure.html#rtc_key_procedures__section_l1w_z5s_c1c">Reboot Reason 的设计</a></td></tr></tbody></table></div>
<div class="table-container"><table class="- topic/table table frame-all" id="rtc_interface_design__table_asz_jws_c1c" data-ofbid="rtc_interface_design__table_asz_jws_c1c" data-cols="2"><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"> 9</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">aic_get_software_reboot_reason</span></caption><colgroup><col style="width:25%"/><col style="width:75%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="rtc_interface_design__table_asz_jws_c1c__entry__1">函数原型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="rtc_interface_design__table_asz_jws_c1c__entry__2">enum aic_reboot_reason
aic_get_software_reboot_reason(void)</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_asz_jws_c1c__entry__1">功能说明</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_asz_jws_c1c__entry__2">从 BAK 寄存器中读取上一次系统的 Reboot reason 类型</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_asz_jws_c1c__entry__1">参数定义</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_asz_jws_c1c__entry__2">无</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="rtc_interface_design__table_asz_jws_c1c__entry__1">返回值</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="rtc_interface_design__table_asz_jws_c1c__entry__2">aic_reboot_reason 类型的启动原因</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="rtc_interface_design__table_asz_jws_c1c__entry__1">注意事项</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="rtc_interface_design__table_asz_jws_c1c__entry__2">aic_reboot_reason 详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="rtc-key-procedure.html#rtc_key_procedures__section_l1w_z5s_c1c">Reboot Reason 的设计</a></td></tr></tbody></table></div>
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