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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">2 Dec 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="d304728e27__20250121171809">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>
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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="d304728e36__20250121171809">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="d304728e49__20250121171809">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="d304728e57__20250121171809">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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