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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/pwm/pwm_test.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">测试指南</h1><div class="date inPage">18 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d115492e22__20250121171557">测试环境：<ul class="- topic/ul ul" id="pwm_test_guide__ul_mxh_djs_21c" data-ofbid="pwm_test_guide__ul_mxh_djs_21c"><li class="- topic/li li" data-ofbid="d115492e25__20250121171557">硬件<ul class="- topic/ul ul" id="pwm_test_guide__ul_jh4_cjs_21c" data-ofbid="pwm_test_guide__ul_jh4_cjs_21c"><li class="- topic/li li" data-ofbid="d115492e28__20250121171557">
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<p class="- topic/p p" data-ofbid="d115492e30__20250121171557">开发板，或 D211 的 FPGA 板</p>
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</li><li class="- topic/li li" data-ofbid="d115492e33__20250121171557">
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<p class="- topic/p p" data-ofbid="d115492e35__20250121171557">示波器，用于观察输出 PWM 信号的波形</p>
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</li></ul></li><li class="- topic/li li" data-ofbid="d115492e38__20250121171557">软件：PC 端的串口终端软件，用于 PC 和开发板进行串口通信</li></ul></div><section class="- topic/section section" id="pwm_test_guide__section_lh4_cjs_21c" data-ofbid="pwm_test_guide__section_lh4_cjs_21c"><h2 class="- topic/title title sectiontitle">软件配置</h2>
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<div class="- topic/p p" data-ofbid="d115492e45__20250121171557">背光测试中，需要依赖 Backlight 的功能：<ol class="- topic/ol ol" id="pwm_test_guide__ol_mh4_cjs_21c" data-ofbid="pwm_test_guide__ol_mh4_cjs_21c"><li class="- topic/li li" data-ofbid="d115492e48__20250121171557">
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<p class="- topic/p p" data-ofbid="d115492e50__20250121171557">在内核中打开 Backlight 模块，详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_config.html#pwm_configuration__section_hqy_23s_21c">内核配置</a>。</p>
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</li><li class="- topic/li li" data-ofbid="d115492e57__20250121171557">
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<p class="- topic/p p" data-ofbid="d115492e59__20250121171557">在 DTS 中配置 Backlight 和 PWMx 通道的关联，详见 <a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_config.html#pwm_configuration__li_qjm_hjs_21c">背光控制配置</a>。</p>
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</li></ol></div>
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</section><section class="- topic/section section" id="pwm_test_guide__section_nh4_cjs_21c" data-ofbid="pwm_test_guide__section_nh4_cjs_21c"><h2 class="- topic/title title sectiontitle">背光测试</h2>
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<p class="- topic/p p" data-ofbid="d115492e72__20250121171557">利用 Linux Backlight 子系统生成的 Sysfs 节点，就可以逐级控制背光的亮度变化，详见设置背光<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_debug.html#pwm_debug_guide__li_ms1_2h1_tdc">设置背光</a>。</p>
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</section><section class="- topic/section section" id="pwm_test_guide__section_oh4_cjs_21c" data-ofbid="pwm_test_guide__section_oh4_cjs_21c"><h2 class="- topic/title title sectiontitle">测试 PWM 信号</h2>
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<p class="- topic/p p" data-ofbid="d115492e84__20250121171557">需要借助示波器，方法是：</p>
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<ol class="- topic/ol ol" id="pwm_test_guide__ol_ph4_cjs_21c" data-ofbid="pwm_test_guide__ol_ph4_cjs_21c"><li class="- topic/li li" data-ofbid="d115492e88__20250121171557">
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<p class="- topic/p p" data-ofbid="d115492e90__20250121171557">通过 Sysfs 节点中的 <code class="+ topic/ph pr-d/codeph ph codeph">config</code> 节点，设置 PWM 某通道的参数，方法见<a xml:lang="zh-CN" lang="zh-CN" class="- topic/xref xref" href="pwm_debug.html#pwm_debug_guide__section_czn_c5r_sdc">动态配置 PWM 通道</a>。</p>
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</li><li class="- topic/li li" data-ofbid="d115492e100__20250121171557">
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<p class="- topic/p p" data-ofbid="d115492e102__20250121171557">用示波器查看该 PWM 通道的信号输出是否符合预期。</p>
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</li></ol>
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<p class="- topic/p p" data-ofbid="d115492e106__20250121171557">以下是一些典型的参数组合，可参考：</p>
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<div class="table-container"><table class="- topic/table table frame-all" id="pwm_test_guide__table_qh4_cjs_21c" data-ofbid="pwm_test_guide__table_qh4_cjs_21c" data-cols="9"><caption></caption><colgroup><col style="width:20.07992007992008%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/><col style="width:9.990009990009991%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__1">Mode</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__2">CBD</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__3">CBU</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__4">CAD</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__5">CAU</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__6">PRD</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__7">ZRO</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__8">
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<p class="- topic/p p" data-ofbid="d115492e138__20250121171557">Def</p>
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<p class="- topic/p p" data-ofbid="d115492e141__20250121171557">level</p>
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</th><th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_test_guide__table_qh4_cjs_21c__entry__9">
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<p class="- topic/p p" data-ofbid="d115492e146__20250121171557">本 SoC</p>
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<p class="- topic/p p" data-ofbid="d115492e149__20250121171557">测试结果</p>
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</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__1" rowspan="4">
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<p class="- topic/p p" data-ofbid="d115492e156__20250121171557">Up</p>
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<p class="- topic/p p" data-ofbid="d115492e159__20250121171557">count</p>
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</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__1" rowspan="4">
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<p class="- topic/p p" data-ofbid="d115492e232__20250121171557">Down</p>
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<p class="- topic/p p" data-ofbid="d115492e235__20250121171557">count</p>
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</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__1" rowspan="2">
|
||
<p class="- topic/p p" data-ofbid="d115492e308__20250121171557">Up-Down</p>
|
||
<p class="- topic/p p" data-ofbid="d115492e311__20250121171557">count</p>
|
||
</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__4">low</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__5">high</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__6">high</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__7">low</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_test_guide__table_qh4_cjs_21c__entry__9">负占空比</td></tr></tbody></table></div>
|
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<p class="- topic/p p" data-ofbid="d115492e349__20250121171557">其中，“正占空比”和“负占空比” 的意思是指当通过 Backlight 节点设置背光亮度时，得到的占空比结果是正向、还是反向的。</p>
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