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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-key-procedure-lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
                    Read time: 1 minute(s)
                </div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="rtc_key_procedures__id4" data-ofbid="rtc_key_procedures__id4"><h2 class="- topic/title title sectiontitle">初始化流</h2>
            
            <p class="- topic/p p" data-ofbid="d239813e29__20250121171658">RTC 驱动的初始化接口通过 <code class="+ topic/ph pr-d/codeph ph codeph">INIT_BOARD_EXPORT(drv_rtc_init)</code> 完成，主要是通过调用 RTC 子系统的接口
                rt_hw_rtc_register() 注册一个 RTC 设备。</p>
            <div class="- topic/p p" data-ofbid="d239813e35__20250121171658">RTC 控制器的初始化流程放在 rtc_ops_init() 接口中实现，其中主要步骤有：<ol class="- topic/ol ol arabic simple" id="rtc_key_procedures__ol_jqr_gwh_bdc" data-ofbid="rtc_key_procedures__ol_jqr_gwh_bdc"><li class="- topic/li li" data-ofbid="d239813e38__20250121171658">
                        <p class="- topic/p p" data-ofbid="d239813e40__20250121171658">初始化模块的时钟 (clk)，确保 RTC 控制器所需的时钟已经正确配置和启用。</p>
                    </li><li class="- topic/li li" data-ofbid="d239813e43__20250121171658">
                        <p class="- topic/p p" data-ofbid="d239813e45__20250121171658">注册中断。</p>
                        <p class="- topic/p p" data-ofbid="d239813e48__20250121171658">为 RTC 控制器分配并注册中断处理程序，以便在闹钟触发时能够及时响应。</p>
                    </li><li class="- topic/li li" data-ofbid="d239813e51__20250121171658">
                        <p class="- topic/p p" data-ofbid="d239813e53__20250121171658">设置校准参数。</p>
                        <p class="- topic/p p" data-ofbid="d239813e56__20250121171658">根据用户实测的 32 KHz 晶振频率值，计算并设置校准参数，以确保 RTC 的时间精度。</p>
                    </li><li class="- topic/li li" data-ofbid="d239813e59__20250121171658">
                        <p class="- topic/p p" data-ofbid="d239813e61__20250121171658">配置 Alarm IO 的输出信号。</p>
                        <p class="- topic/p p" data-ofbid="d239813e64__20250121171658">如果系统配置了 Alarm IO 输出信号，则使能相应的硬件功能，否则可略过。</p>
                    </li></ol></div>
        </section><section class="- topic/section section" id="rtc_key_procedures__section_ivs_ql5_mdc" data-ofbid="rtc_key_procedures__section_ivs_ql5_mdc"><h2 class="- topic/title title sectiontitle">校准算法设计</h2>
            
            <p class="- topic/p p" data-ofbid="d239813e73__20250121171658">校准的算法原理是将输入的 32 KHz 晶振时钟校准到理想的 32 KHz，公式如下：</p>
            <pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="rtc_key_procedures__codeblock_kqr_gwh_bdc" data-ofbid="rtc_key_procedures__codeblock_kqr_gwh_bdc">(<span class="hl-number">100</span> * <span class="hl-number">1024</span> * <span class="hl-number">1024</span> + <span class="hl-number">100</span> * calibrate) / (clock-rate / <span class="hl-number">32</span>) = <span class="hl-number">1024</span>
=&gt; calibrate = (clock-rate * <span class="hl-number">32</span> - <span class="hl-number">100</span> * <span class="hl-number">1024</span> * <span class="hl-number">1024</span>) / <span class="hl-number">100</span>;</pre>
            <p class="- topic/p p" data-ofbid="d239813e79__20250121171658">其中：</p>
            <ul class="- topic/ul ul simple" id="rtc_key_procedures__ul_lqr_gwh_bdc" data-ofbid="rtc_key_procedures__ul_lqr_gwh_bdc"><li class="- topic/li li" data-ofbid="d239813e83__20250121171658">
                    <p class="- topic/p p" data-ofbid="d239813e85__20250121171658">clock-rate：用户实测 32K 晶振的频率值乘以 100，需要配置在 menuconfig 中，详见 <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>
                </li><li class="- topic/li li" data-ofbid="d239813e90__20250121171658">
                    <p class="- topic/p p" data-ofbid="d239813e92__20250121171658">calibrate：最终要填入 RTC 控制器的校准值。</p>
                    <div class="- topic/p p" data-ofbid="d239813e95__20250121171658">校准值 calibrate 分正负<ul class="- topic/ul ul" id="rtc_key_procedures__ul_yz5_3xb_ddc" data-ofbid="rtc_key_procedures__ul_yz5_3xb_ddc"><li class="- topic/li li" data-ofbid="d239813e98__20250121171658">正 - 表示 32K 晶振实际偏快了。</li><li class="- topic/li li" data-ofbid="d239813e100__20250121171658">负 - 表示 32K 晶振偏慢了。</li></ul></div>
                </li></ul>
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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_key_procedures__id4" data-tocid="rtc_key_procedures__id4">初始化流</a></div></li><li class="section-item"><div class="section-title"><a href="#rtc_key_procedures__section_ivs_ql5_mdc" data-tocid="rtc_key_procedures__section_ivs_ql5_mdc">校准算法设计</a></div></li></ul></div>
	                        	
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