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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/gpai/gpai_key_procedure.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">4 Dec 2024</div><div style="color: gray;"></div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="gpai_key_procedures__section_k1k_txk_g1c" data-ofbid="gpai_key_procedures__section_k1k_txk_g1c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<p class="- topic/p p" data-ofbid="d168590e27__20250121171619">GPAI 驱动的初始化接口通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">INIT_DEVICE_EXPORT(drv_gpai_init)</span> 完成，会通过调用 ADC 子系统的接口
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rt_hw_adc_register() 注册一个 ADC 设备。</p>
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<p class="- topic/p p" data-ofbid="d168590e33__20250121171619">GPAI 控制器的初始化过程，主要步骤有：</p>
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<ol class="- topic/ol ol" id="gpai_key_procedures__ol_l1n_txk_g1c" data-ofbid="gpai_key_procedures__ol_l1n_txk_g1c"><li class="- topic/li li" data-ofbid="d168590e37__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e39__20250121171619">初始化模块的 clk</p>
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</li><li class="- topic/li li" data-ofbid="d168590e42__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e44__20250121171619">注册中断</p>
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</li><li class="- topic/li li" data-ofbid="d168590e47__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e49__20250121171619">初始化默认参数</p>
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</li><li class="- topic/li li" data-ofbid="d168590e52__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e54__20250121171619">向设备框架中注册 ADC 设备</p>
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</li></ol>
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</section><section class="- topic/section section" id="gpai_key_procedures__section_qbr_hxk_g1c" data-ofbid="gpai_key_procedures__section_qbr_hxk_g1c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
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<p class="- topic/p p" data-ofbid="d168590e63__20250121171619">GPAI 支持使用中断方式来读取数据，这样避免软件去做等待处理。</p>
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<figure class="- topic/fig fig fignone" id="gpai_key_procedures__fig_qln_wrr_21c" data-ofbid="gpai_key_procedures__fig_qln_wrr_21c"><div class="- topic/p p" data-ofbid="d168590e69__20250121171619"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="gpai_key_procedures__image_dgb_vxk_g1c" src="../../../images/gpai/gpai_irq_flow.png" alt="gpai_irq_flow"/></div><br/></div><figcaption data-caption-side="bottom" class="- topic/title title figcap"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">GPAI 非周期模式的数据采集流程</span></figcaption></figure>
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<ul class="- topic/ul ul" id="gpai_key_procedures__ul_h2t_qrr_21c" data-ofbid="gpai_key_procedures__ul_h2t_qrr_21c"><li class="- topic/li li" data-ofbid="d168590e75__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e77__20250121171619">对于非周期模式：当用户层触发 <span class="- topic/ph ph">convert()</span> 接口，就会启动一次硬件去读数据</p>
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</li><li class="- topic/li li" data-ofbid="d168590e83__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e85__20250121171619">当硬件准备好数据，会产生一个中断</p>
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</li><li class="- topic/li li" data-ofbid="d168590e88__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e90__20250121171619">在中断处理函数中，用 INT Flag 来区分是哪个通道有数据，逐个通道扫描将数据读出，会缓存到一个全局变量中</p>
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</li><li class="- topic/li li" data-ofbid="d168590e93__20250121171619">
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<p class="- topic/p p" data-ofbid="d168590e95__20250121171619">对于周期模式：GPAI 控制器会自动按给定周期产生一次数据中断</p>
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</li></ul>
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<div class="- topic/note note note note_note" id="gpai_key_procedures__note_id3_xrr_21c" data-ofbid="gpai_key_procedures__note_id3_xrr_21c"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d168590e101__20250121171619">TODO：目前，当产生高电平、低电平告警的时候，只是驱动中打印警告信息，暂未做其他处理。</p>
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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="#gpai_key_procedures__section_k1k_txk_g1c" data-tocid="gpai_key_procedures__section_k1k_txk_g1c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#gpai_key_procedures__section_qbr_hxk_g1c" data-tocid="gpai_key_procedures__section_qbr_hxk_g1c">中断处理流程</a></div></li></ul></div>
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