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id="psadc_interface_design-d4445e7187-link">接口设计</a></div></div></li></ul></li><li role="treeitem"><div data-tocid="psadc_common_issues-d4445e7201" class="topicref" data-id="psadc_common_issues" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/psadc/psadc-common_issues.html" id="psadc_common_issues-d4445e7201-link">常见问题</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="uart_user_guide-d4445e7215" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d4445e7215-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide.html" id="uart_user_guide-d4445e7215-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d4445e7299" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d4445e7299-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide.html" id="usb_user_guide-d4445e7299-link">USB 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" title="Edit this document" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/psadc/psadc-key_procedures.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1>
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<div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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<div class="- topic/body concept/conbody body conbody">
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<section class="- topic/section section" id="psadc_key_procedures__section_izs_vsz_21c" data-ofbid="psadc_key_procedures__section_izs_vsz_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2>
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<div class="- topic/p p" data-ofbid="d201472e38__20250123155222">PSADC
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模块完全遵循 driver 的通用初始化流程，申请 regs 资源、clk、reset，还需要注册一个 iio 设备，使用 iio 子系统提供的注册接口 iio_device_register()：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="psadc_key_procedures__codeblock_t4g_xsz_21c" data-ofbid="psadc_key_procedures__codeblock_t4g_xsz_21c"><code>#<span class="hl-directive">define</span> iio_device_register(indio_dev) \
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__iio_device_register((indio_dev), THIS_MODULE)</code></pre></div>
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<div class="- topic/p p" data-ofbid="d201472e43__20250123155222">参数 dev 是一个 struct iio_dev 类型的指针，其中关键信息有：设备名称、通道数目、一组 iio 的操作集(struct
|
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iio_info)、通道配置信息等。在 info 中，我们暂时只实现了一个 read 接口：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="psadc_key_procedures__codeblock_ctc_xsz_21c" data-ofbid="psadc_key_procedures__codeblock_ctc_xsz_21c"><code><strong class="hl-keyword">static</strong> <strong class="hl-keyword">const</strong> <strong class="hl-keyword">struct</strong> iio_info aic_psadc_iio_info = {
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.read_raw = aic_psadc_read_raw,
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};</code></pre></div>
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</section>
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<section class="- topic/section section" id="psadc_key_procedures__section_lzs_vsz_21c" data-ofbid="psadc_key_procedures__section_lzs_vsz_21c"><h2 class="- topic/title title sectiontitle">中断处理流程</h2>
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<p class="- topic/p p" data-ofbid="d201472e54__20250123155222">PSADC 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="psadc_key_procedures__fig_jgn_wsz_21c" data-ofbid="psadc_key_procedures__fig_jgn_wsz_21c">
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<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="psadc_key_procedures__image_mzs_vsz_21c" src="../../../images/psadc/psadc_irq_flow1.png" alt="psadc_irq_flow1"/></div><br/>
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<figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><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">PSADC 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="psadc_key_procedures__ul_nzs_vsz_21c" data-ofbid="psadc_key_procedures__ul_nzs_vsz_21c">
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<li class="- topic/li li" data-ofbid="d201472e71__20250123155222">
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<p class="- topic/p p" data-ofbid="d201472e73__20250123155222">对于非周期模式：当用户层触发<span class="- topic/ph ph">read_raw()</span>接口，就会启动一次硬件去读数据</p>
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</li>
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<li class="- topic/li li" data-ofbid="d201472e80__20250123155222">
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<p class="- topic/p p" data-ofbid="d201472e82__20250123155222">当硬件准备好数据，会产生一个中断</p>
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</li>
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<li class="- topic/li li" data-ofbid="d201472e86__20250123155222">
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<p class="- topic/p p" data-ofbid="d201472e88__20250123155222">在中断处理函数中，用<span class="- topic/ph ph">INT</span>
|
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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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