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class="title"><a href="../../../topics/sdk/gpio/gpio_user_guide.html" id="id-d5856e5408-link">GPIO 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="i2c_user_guide-d5856e5480" class="topicref" data-id="i2c_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action i2c_user_guide-d5856e5480-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/i2c/i2c_user_guide_2.html" id="i2c_user_guide-d5856e5480-link">I2C 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e5576" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e5576-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/psadc/psadc_user_guide_2.html" id="id-d5856e5576-link">PSADC 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div 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class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/spi/spi_user_guide_2.html" id="spi-d5856e5805-link"><span class="ph">Q</span>SPI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="uart_user_guide-d5856e5879" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d5856e5879-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide_2.html" id="uart_user_guide-d5856e5879-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d5856e5951" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d5856e5951-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide_2.html" id="usb_user_guide-d5856e5951-link">USB 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e6011" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e6011-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/mac/mac_user_guide_2.html" id="id-d5856e6011-link">MAC 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d5856e6083" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d5856e6083-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d5856e6083-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 topic" 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_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;"></div><div class="- topic/body body"><section class="- topic/section section" id="id__section_tnw_gpf_fdc" data-ofbid="id__section_tnw_gpf_fdc"><h2 class="- topic/title title sectiontitle">采样电压大于 ADC 基准参考电压</h2>
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<div class="- topic/div div section" id="id__id2">
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
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<p class="- topic/p p" data-ofbid="d142710e29__20250121171609">假设当我们想要使用 GPAI 进行 4 V 电压采样，但此时，对应型号 ADC 基准参考电压为 3 V</p>
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<div class="- topic/div div section" id="id__id3">
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<strong class="+ topic/ph hi-d/b ph b">解决方法</strong>
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<p class="- topic/p p" data-ofbid="d142710e38__20250121171609">可采用电阻分压进行电压计算</p></div>
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</section><section class="- topic/section section" id="id__section_us5_rb3_fdc" data-ofbid="id__section_us5_rb3_fdc"><h2 class="- topic/title title sectiontitle">ADC 采样卡死</h2>
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<div class="- topic/div div section" id="id__id5">
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<strong class="+ topic/ph hi-d/b ph b">现象</strong>
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<p class="- topic/p p" data-ofbid="d142710e51__20250121171609">使用线程调度 GPAI 进行周期采样时，ADC 值应该是波动的变化的值，但却发现无论电压怎么改变，ADC 值一直保持在某数值</p></div>
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<div class="- topic/div div section" id="id__id6">
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<strong class="+ topic/ph hi-d/b ph b">解决方法</strong>
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<p class="- topic/p p" data-ofbid="d142710e59__20250121171609">GPAI 的通道打开应该在线程调度 GPAI 采样之前进行，并且只需打开通道一次。若在线程调度内调用通道打开，
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由于频繁的打开关闭通道，会导致通道状态繁忙，从而导致 GPAI 无法获取中断状态，即出现 ADC 采样卡死现象</p></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="#id__section_tnw_gpf_fdc" data-tocid="id__section_tnw_gpf_fdc">采样电压大于 ADC 基准参考电压</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_us5_rb3_fdc" data-tocid="id__section_us5_rb3_fdc">ADC 采样卡死</a></div></li></ul></div>
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