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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/pwm/pwm_config_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">参数配置</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body body"><section class="- topic/section section" id="id__section_mrf_pzy_gdc" data-ofbid="id__section_mrf_pzy_gdc"><h2 class="- topic/title title sectiontitle">驱动配置</h2>
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<div class="- topic/p p" data-ofbid="d129762e24__20250121171605">
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<ol class="- topic/ol ol arabic simple" id="id__ol_kg3_pzy_gdc" data-ofbid="id__ol_kg3_pzy_gdc"><li class="- topic/li li" data-ofbid="d129762e27__20250121171605">
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<p class="- topic/p p" data-ofbid="d129762e29__20250121171605">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入
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menuconfig 的功能配置界面。</p>
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</li><li class="- topic/li li" data-ofbid="d129762e38__20250121171605">
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<div class="- topic/p p" data-ofbid="d129762e40__20250121171605">选择需要的 pwm/epwm 通道。以下以打开 PWM3
|
||
作为示例：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_v4f_z2p_rdc" data-ofbid="id__codeblock_v4f_z2p_rdc">Board options --->
|
||
[ ] Using PWM0
|
||
[ ] Using PWM1
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[ ] Using PWM2
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[*] Using PWM3
|
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Using EPWM --->
|
||
[ ] Using EPWM0
|
||
[ ] Using EPWM1
|
||
[ ] Using EPWM2
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[ ] Using EPWM3
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[ ] Using EPWM4
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[ ] Using EPWM5</pre></div>
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<div class="- topic/note note tip note_tip" id="id__note_uyl_qn3_ddc" data-ofbid="id__note_uyl_qn3_ddc"><span class="note__title">提示：</span>
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||
<p class="- topic/p p" data-ofbid="d129762e47__20250121171605">为了简化使用，打开 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">Using PWMx/EPWMx</span> 会自动打开 RT-Thread 的
|
||
PWM 设备驱动框架。</p>
|
||
</div>
|
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</li><li class="- topic/li li" data-ofbid="d129762e54__20250121171605">
|
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<p class="- topic/p p" data-ofbid="d129762e56__20250121171605">在 menuconfig 界面中打开 RT-Thread 的 PWM 设备驱动框架。 使用 RT-Thread 内核的时，PWM/EPWM
|
||
驱动需要依赖 RT-Thread 的 PWM 设备驱动框架。</p>
|
||
</li></ol>
|
||
</div>
|
||
</section><section class="- topic/section section" id="id__section_hbv_pzy_gdc" data-ofbid="id__section_hbv_pzy_gdc"><h2 class="- topic/title title sectiontitle">PWM 自定义参数</h2>
|
||
|
||
<div class="- topic/div div section" id="id__pwm">
|
||
<p class="- topic/p p" data-ofbid="d129762e68__20250121171605">PWM 驱动在 <span class="+ topic/ph sw-d/filepath ph filepath">drv_pwm.c</span> 中提供了一个接口
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">aic_pwm_default_action()</code> 来配置 PWM 各通道的行为参数（EPWM 驱动的接口是
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">drv_pwm.c</span> 中的 <code class="+ topic/ph pr-d/codeph ph codeph">aic_epwm_default_action()</code>
|
||
）。</p>
|
||
<p class="- topic/p p" data-ofbid="d129762e83__20250121171605">如果因为板级硬件设计的差异，和实际应用场景不同，可以对这些参数进行调整。参数的定义如下表：</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_wjc_qzy_gdc" data-ofbid="id__table_wjc_qzy_gdc" data-cols="4"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title"></span></caption><colgroup><col/><col/><col/><col/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_wjc_qzy_gdc__entry__1">参数名称</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_wjc_qzy_gdc__entry__2">类型</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_wjc_qzy_gdc__entry__3">取值范围</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_wjc_qzy_gdc__entry__4">功能说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__1">mode</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__2">enum</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__3">up/down/up-down-count</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__4">配置增减模式</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__1">default-level</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__2">正整数</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__3">[0, 1]</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__4">默认/初始电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__1">action0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__2">数据结构</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__3">配置 CAD、CAU 等行为</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_wjc_qzy_gdc__entry__4">多个关键时点的触发行为</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_wjc_qzy_gdc__entry__1">action1</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_wjc_qzy_gdc__entry__2">数据结构</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_wjc_qzy_gdc__entry__3">配置 CAD、CAU 等行为</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_wjc_qzy_gdc__entry__4">多个关键时点的触发行为</td></tr></tbody></table></div>
|
||
<p class="- topic/p p" data-ofbid="d129762e141__20250121171605">表中 action0 和 action1 会涉及 4 种行为类型，定义如下：</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_xjc_qzy_gdc" data-ofbid="id__table_xjc_qzy_gdc" data-cols="2"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 2</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">Action 类型及其行为</span></caption><colgroup><col/><col/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_xjc_qzy_gdc__entry__1">Action 类型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_xjc_qzy_gdc__entry__2">行为描述</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_xjc_qzy_gdc__entry__1">PWM_ACT_NONE/EPWM_ACT_NONE</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_xjc_qzy_gdc__entry__2">不做任何变化，保持之前的输出电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_xjc_qzy_gdc__entry__1">PWM_ACT_LOW/EPWM_ACT_LOW</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_xjc_qzy_gdc__entry__2">跳变为 0 电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_xjc_qzy_gdc__entry__1">PWM_ACT_HIGH/EPWM_ACT_HIGH</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_xjc_qzy_gdc__entry__2">跳变为 1 电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_xjc_qzy_gdc__entry__1">PWM_ACT_INVERSE/EPWM_ACT_INVERSE</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_xjc_qzy_gdc__entry__2">跳变为反向的电平，比如从 0 跳变为 1</td></tr></tbody></table></div>
|
||
<p class="- topic/p p" data-ofbid="d129762e179__20250121171605">以下是一些典型的参数组合，可参考：</p>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="id__table_yjc_qzy_gdc" data-ofbid="id__table_yjc_qzy_gdc" data-cols="9"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">典型参数组合</span></caption><colgroup><col style="width:12.973667308927425%"/><col style="width:6.74373795761079%"/><col style="width:6.422607578676942%"/><col style="width:8.413615928066795%"/><col style="width:7.964033397559408%"/><col style="width:8.413615928066795%"/><col style="width:8.028259473346179%"/><col style="width:10.918432883750802%"/><col style="width:30.122029543994866%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__1">Mode</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__2">CBD</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__3">CBU</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__4">CAD</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__5">CAU</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__6">PRD</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__7">ZRO</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_yjc_qzy_gdc__entry__8">Def level</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_yjc_qzy_gdc__entry__9">
|
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<p class="- topic/p p" data-ofbid="d129762e215__20250121171605">本 SoC 测试结果</p>
|
||
</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__1" rowspan="4">
|
||
<p class="- topic/p p" data-ofbid="d129762e222__20250121171605">Up count</p>
|
||
</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">正占空比（默认）</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__1" rowspan="4">
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<p class="- topic/p p" data-ofbid="d129762e295__20250121171605">Down count</p>
|
||
</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">负占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__1" rowspan="2">
|
||
<p class="- topic/p p" data-ofbid="d129762e368__20250121171605">Up-Down count</p>
|
||
</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__4">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__5">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__6">low</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__7">high</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__8">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_yjc_qzy_gdc__entry__9">正占空比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__2">-</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__3">-</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__4">low</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__5">high</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__6">high</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__7">low</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__8">1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_yjc_qzy_gdc__entry__9">负占空比</td></tr></tbody></table></div>
|
||
<p class="- topic/p p" data-ofbid="d129762e405__20250121171605">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>
|
||
</div>
|
||
</section><section class="- topic/section section" id="id__section_lhg_fyn_4dc" data-ofbid="id__section_lhg_fyn_4dc"><h2 class="- topic/title title sectiontitle">时钟配置</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d129762e414__20250121171605">PWM 模块涉及时钟的衍生关系：</p>
|
||
<figure class="- topic/fig fig fignone" id="id__fig_xy3_1js_21c" data-ofbid="id__fig_xy3_1js_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_sxm_lbp_g1c" src="../../../reusables/reused-topics/../../images/pwm/pwm_clk_tree.png" width="480" alt="pwm_clk_tree"/></div><br/><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">PWM 模块的时钟衍生关系图</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d129762e424__20250121171605">EWM 模块涉及时钟的衍生关系：</p>
|
||
<figure class="- topic/fig fig fignone" id="id__fig_bct_z3s_21c" data-ofbid="id__fig_bct_z3s_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_y4x_lbp_g1c" src="../../../reusables/reused-topics/../../images/pwmcs/epwm_clk_tree.png" width="480" alt="epwm_clk_tree"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">EPWM 模块的时钟衍生关系图</span></figcaption></figure>
|
||
|
||
<div class="- topic/note note note note_note" id="id__note_rkx_1js_21c" data-ofbid="id__note_rkx_1js_21c"><span class="note__title">注：</span>
|
||
<div class="- topic/p p" data-ofbid="d129762e437__20250121171605">容易混淆的 sysclk：<ul class="- topic/ul ul" id="id__ul_rqy_23s_21c" data-ofbid="id__ul_rqy_23s_21c"><li class="- topic/li li" data-ofbid="d129762e440__20250121171605">
|
||
<p class="- topic/p p" data-ofbid="d129762e442__20250121171605">PWM 驱动中，按照惯例将父时钟称作 <span class="+ topic/keyword pr-d/parmname keyword parmname">sysclk</span>，即上图的 PLL INT1。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d129762e448__20250121171605">
|
||
<p class="- topic/p p" data-ofbid="d129762e450__20250121171605">PWM 硬件 spec 中，将上图中的 PWM Clk 称作 <span class="+ topic/keyword pr-d/parmname keyword parmname">sysclk</span>。</p>
|
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</li></ul></div>
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