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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_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">PWM 配置</h1><div class="date inPage">17 Dec 2024</div><div style="color: gray;">
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Read time: 8 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="pwm_configuration__section_hqy_23s_21c" data-ofbid="pwm_configuration__section_hqy_23s_21c"><h2 class="- topic/title title sectiontitle">内核配置</h2>
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<ol class="- topic/ol ol" id="pwm_configuration__ol_udc_4fr_sdc" data-ofbid="pwm_configuration__ol_udc_4fr_sdc"><li class="- topic/li li" data-ofbid="d190773e28__20250121171630">
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<div class="- topic/div div">
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<div class="- topic/p p" data-ofbid="d190773e32__20250121171630">在 SDK 根目录下，执行下列命令，进入 kernel
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的功能配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__codeblock_wg1_3ml_sdc" data-ofbid="pwm_configuration__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
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<p class="- topic/p p" data-ofbid="d190773e37__20250121171630">或使用简写命令</p>
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<div class="- topic/p p" data-ofbid="d190773e40__20250121171630">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__codeblock_uss_hml_sdc" data-ofbid="pwm_configuration__codeblock_uss_hml_sdc">make km</pre>
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</div>
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</div>
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</li><li class="- topic/li li" data-ofbid="d190773e47__20250121171630">
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<div class="- topic/p p" data-ofbid="d190773e49__20250121171630">在内核配置界面，按如下选择：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__pre_iqy_23s_21c" data-ofbid="pwm_configuration__pre_iqy_23s_21c">Linux
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Device Drivers --->
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[*] Pulse-Width Modulation (PWM) Support --->
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<*> ArtInChip PWM support
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<*> ArtInChip EPWM support
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</pre></div>
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</li><li class="- topic/li li" data-ofbid="d190773e54__20250121171630">
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<p class="- topic/p p" data-ofbid="d190773e56__20250121171630">如需设置 PWM 模块的背光控制功能，执行下列配置，否则可跳过。</p>
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<p class="- topic/p p" data-ofbid="d190773e59__20250121171630">在 SDK 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make kernel-menuconfig</span> 或
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<span class="+ topic/keyword sw-d/cmdname keyword cmdname">make me</span>，进入 kernel 的功能配置，按如下选择：</p>
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<div class="- topic/p p" data-ofbid="d190773e68__20250121171630">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__pre_jqy_23s_21c" data-ofbid="pwm_configuration__pre_jqy_23s_21c">Linux
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Device Drivers --->
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Graphics support --->
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Backlight & LCD device support --->
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<*> Lowlevel Backlight controls
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<*> Generic PWM based Backlight Driver
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</pre>
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</div>
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</li><li class="- topic/li li" data-ofbid="d190773e74__20250121171630">
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<p class="- topic/p p" data-ofbid="d190773e76__20250121171630">如使用 logo 功能，须在 Boot 阶段打开屏幕背光，否则可跳过。</p>
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<p class="- topic/p p" data-ofbid="d190773e79__20250121171630">在 SDK 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make kernel-menuconfig</span> 或
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<span class="+ topic/keyword sw-d/cmdname keyword cmdname">make me</span>，进入 kernel 的功能配置，按如下选择：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__pre_kqy_23s_21c" data-ofbid="pwm_configuration__pre_kqy_23s_21c">U-Boot
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Device Drivers --->
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[*] Enable support <strong class="hl-keyword">for</strong> pulse-width modulation devices (PWM)
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[*] Enable support <strong class="hl-keyword">for</strong> ArtInChip PWM
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Graphics support --->
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[*] Generic PWM based Backlight Driver
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</pre>
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</li></ol>
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</section><section class="- topic/section section" id="pwm_configuration__section_lqy_23s_21c" data-ofbid="pwm_configuration__section_lqy_23s_21c"><h2 class="- topic/title title sectiontitle">DTS 参数配置</h2>
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<p class="- topic/p p" data-ofbid="d190773e97__20250121171630">PWM 驱动支持从 DTS 中配置的自定义参数，如下表所示：</p>
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<div class="table-container"><table class="- topic/table table frame-all" id="pwm_configuration__table_mqy_23s_21c" data-ofbid="pwm_configuration__table_mqy_23s_21c" 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">PWM 自定义参数</span></caption><colgroup><col style="width:17.152658662092623%"/><col style="width:18.524871355060036%"/><col style="width:30.360205831903947%"/><col style="width:33.9622641509434%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_configuration__table_mqy_23s_21c__entry__1">参数名称</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_configuration__table_mqy_23s_21c__entry__2">类型</th><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_configuration__table_mqy_23s_21c__entry__3">取值范围</th><th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_configuration__table_mqy_23s_21c__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="pwm_configuration__table_mqy_23s_21c__entry__1">mode</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__2">String</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__3">up/down/up-down-count</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__4">配置增减模式</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__1">tb-clk-rate</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__2">Integer</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__3">(0, 24000000)</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__4">时基计数器的工作时钟</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__1">action0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__2">String</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__3">none/low/high/inverse</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__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-1" headers="pwm_configuration__table_mqy_23s_21c__entry__1">action1</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__2">String</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__entry__3">none/low/high/inverse</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_mqy_23s_21c__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="pwm_configuration__table_mqy_23s_21c__entry__1">default-level</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_configuration__table_mqy_23s_21c__entry__2">Integer</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_configuration__table_mqy_23s_21c__entry__3">[0, 1]</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_configuration__table_mqy_23s_21c__entry__4">默认/初始电平</td></tr></tbody></table></div>
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<div class="- topic/note note note note_note" id="pwm_configuration__note_ls5_43s_21c" data-ofbid="pwm_configuration__note_ls5_43s_21c"><span class="note__title">注：</span>
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<p class="- topic/p p" data-ofbid="d190773e167__20250121171630">为了方便表达，所有参数名称都省略了前缀 “aic,”。</p>
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</div>
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<p class="- topic/p p" data-ofbid="d190773e171__20250121171630">表中 action0 和 action1 四种取值的含义，定义如下：</p>
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<div class="table-container"><table class="- topic/table table frame-all" id="pwm_configuration__table_nqy_23s_21c" data-ofbid="pwm_configuration__table_nqy_23s_21c" 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">action0 和 action1 取值含义</span></caption><colgroup><col style="width:46.51162790697674%"/><col style="width:53.48837209302325%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="pwm_configuration__table_nqy_23s_21c__entry__1">Action 类型</th><th class="- topic/entry entry colsep-0 rowsep-1" id="pwm_configuration__table_nqy_23s_21c__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="pwm_configuration__table_nqy_23s_21c__entry__1">none</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_nqy_23s_21c__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="pwm_configuration__table_nqy_23s_21c__entry__1">low</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_nqy_23s_21c__entry__2">跳变为 0 电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="pwm_configuration__table_nqy_23s_21c__entry__1">high</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="pwm_configuration__table_nqy_23s_21c__entry__2">跳变为 1 电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="pwm_configuration__table_nqy_23s_21c__entry__1">inverse</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="pwm_configuration__table_nqy_23s_21c__entry__2">跳变为反向的电平，比如从 0 跳变为 1</td></tr></tbody></table></div>
|
||
</section><section class="- topic/section section" id="pwm_configuration__section_lhg_fyn_4dc" data-ofbid="pwm_configuration__section_lhg_fyn_4dc"><h2 class="- topic/title title sectiontitle">时钟配置</h2>
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||
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||
<p class="- topic/p p" data-ofbid="d190773e214__20250121171630">PWM 模块涉及时钟的衍生关系：</p>
|
||
<figure class="- topic/fig fig fignone" id="pwm_configuration__fig_xy3_1js_21c" data-ofbid="pwm_configuration__fig_xy3_1js_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pwm_configuration__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>
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||
<p class="- topic/p p" data-ofbid="d190773e224__20250121171630">EWM 模块涉及时钟的衍生关系：</p>
|
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<figure class="- topic/fig fig fignone" id="pwm_configuration__fig_bct_z3s_21c" data-ofbid="pwm_configuration__fig_bct_z3s_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="pwm_configuration__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>
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|
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<div class="- topic/note note note note_note" id="pwm_configuration__note_rkx_1js_21c" data-ofbid="pwm_configuration__note_rkx_1js_21c"><span class="note__title">注：</span>
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||
<div class="- topic/p p" data-ofbid="d190773e237__20250121171630">容易混淆的 sysclk：<ul class="- topic/ul ul" id="pwm_configuration__ul_rqy_23s_21c" data-ofbid="pwm_configuration__ul_rqy_23s_21c"><li class="- topic/li li" data-ofbid="d190773e240__20250121171630">
|
||
<p class="- topic/p p" data-ofbid="d190773e242__20250121171630">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>
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||
</li><li class="- topic/li li" data-ofbid="d190773e248__20250121171630">
|
||
<p class="- topic/p p" data-ofbid="d190773e250__20250121171630">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>
|
||
</div>
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||
</section><section class="- topic/section section" id="pwm_configuration__section_sqy_23s_21c" data-ofbid="pwm_configuration__section_sqy_23s_21c"><h2 class="- topic/title title sectiontitle">D211 配置</h2>
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||
|
||
<p class="- topic/p p" data-ofbid="d190773e263__20250121171630"><span class="+ topic/ph sw-d/filepath ph filepath">common/d211.dtsi</span> 中的参数配置：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__pre_tqy_23s_21c" data-ofbid="pwm_configuration__pre_tqy_23s_21c">pwm: pwm@<span class="hl-number">19240000</span> {
|
||
compatible = <span class="hl-string">"artinchip,aic-pwm-v1.0"</span>;
|
||
reg = <<span class="hl-number">0x0</span> <span class="hl-number">0x19240000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x1000</span>>;
|
||
interrupts-extended = <&plic0 <span class="hl-number">90</span> IRQ_TYPE_LEVEL_HIGH>;
|
||
#pwm-cells = <<span class="hl-number">3</span>>;
|
||
clocks = <&cmu CLK_PWM>, <&cmu CLK_PLL_INT1>;
|
||
clock-names = <span class="hl-string">"pwm"</span>, <span class="hl-string">"sysclk"</span>;
|
||
resets = <&rst RESET_PWM>;
|
||
clock-rate = <<span class="hl-number">48000000</span>>;
|
||
};
|
||
|
||
epwm: epwm@<span class="hl-number">18200000</span> {
|
||
compatible = <span class="hl-string">"artinchip,aic-epwm-v1.0"</span>;
|
||
reg = <<span class="hl-number">0x0</span> <span class="hl-number">0x18200000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x600</span>>, <<span class="hl-number">0</span> <span class="hl-number">0x1820F000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x1000</span>>;
|
||
interrupts-extended = <&plic0 <span class="hl-number">25</span> IRQ_TYPE_LEVEL_HIGH>;
|
||
#pwm-cells = <<span class="hl-number">3</span>>;
|
||
clocks = <&cmu CLK_PWMCS>, <&cmu CLK_PLL_INT1>;
|
||
clock-names = <span class="hl-string">"pwmcs"</span>, <span class="hl-string">"sysclk"</span>;
|
||
resets = <&rst RESET_PWMCS>;
|
||
clock-rate = <<span class="hl-number">48000000</span>>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};</pre>
|
||
</section><section class="- topic/section section" id="pwm_configuration__section_wwx_s3s_21c" data-ofbid="pwm_configuration__section_wwx_s3s_21c"><h2 class="- topic/title title sectiontitle">Board 配置</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d190773e276__20250121171630">
|
||
<ul class="- topic/ul ul" id="pwm_configuration__ul_m1c_53s_21c" data-ofbid="pwm_configuration__ul_m1c_53s_21c"><li class="- topic/li li" data-ofbid="d190773e279__20250121171630">PWM 通道配置<div class="- topic/p p" data-ofbid="d190773e281__20250121171630"><span class="+ topic/ph sw-d/filepath ph filepath">xxx/board.dts</span>
|
||
中的参数配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__codeblock_cyf_v3s_21c" data-ofbid="pwm_configuration__codeblock_cyf_v3s_21c">&pwm {
|
||
status = <span class="hl-string">"okay"</span>;
|
||
pinctrl-names = <span class="hl-string">"default"</span>;
|
||
pinctrl-<span class="hl-number">0</span> = <&pwm2_pins_b>;
|
||
<em class="hl-comment">/* mode: up-count, down-count, up-down-count
|
||
action: none, low, high, inverse */</em>
|
||
pwm0 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
aic,rise-edge-delay = <<span class="hl-number">10</span>>;
|
||
aic,fall-edge-delay = <<span class="hl-number">10</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
pwm1 {
|
||
aic,mode = <span class="hl-string">"down-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
aic,rise-edge-delay = <<span class="hl-number">10</span>>;
|
||
aic,fall-edge-delay = <<span class="hl-number">10</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
pwm2 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"none"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>;
|
||
aic,<strong class="hl-keyword">default</strong>-level = <<span class="hl-number">0</span>>;
|
||
aic,rise-edge-delay = <<span class="hl-number">10</span>>;
|
||
aic,fall-edge-delay = <<span class="hl-number">10</span>>;
|
||
status = <span class="hl-string">"okay"</span>;
|
||
};
|
||
|
||
pwm3 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"low"</span>, <span class="hl-string">"none"</span>;
|
||
aic,rise-edge-delay = <<span class="hl-number">10</span>>;
|
||
aic,fall-edge-delay = <<span class="hl-number">10</span>>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
};
|
||
|
||
&epwm {
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
pinctrl-names = <span class="hl-string">"default"</span>;
|
||
pinctrl-<span class="hl-number">0</span> = <&epwm0_pins_a>,
|
||
<&epwm1_pins_a>,
|
||
<&epwm2_pins_a>;
|
||
<em class="hl-comment">/* mode: up-count, down-count, up-down-count
|
||
action: none, low, high, inverse */</em>
|
||
epwm0 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
epwm1 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
epwm2 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
epwm3 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
epwm4 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
|
||
epwm5 {
|
||
aic,mode = <span class="hl-string">"up-count"</span>;
|
||
aic,tb-clk-rate = <<span class="hl-number">24000000</span>>;
|
||
<em class="hl-comment">/* CBD, CBU, CAD, CAU, PRD, ZRO */</em>
|
||
aic,action0 = <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
aic,action1 = <span class="hl-string">"none"</span>, <span class="hl-string">"high"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"none"</span>, <span class="hl-string">"low"</span>;
|
||
status = <span class="hl-string">"disabled"</span>;
|
||
};
|
||
};</pre></div></li><li class="- topic/li li" id="pwm_configuration__li_qjm_hjs_21c" data-ofbid="pwm_configuration__li_qjm_hjs_21c">背光控制配置<div class="- topic/p p" data-ofbid="d190773e289__20250121171630">需要在 <span class="+ topic/ph sw-d/filepath ph filepath">xxx/board.dts</span> 中新增一个
|
||
backlight
|
||
节点，如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__codeblock_b1p_v3s_21c" data-ofbid="pwm_configuration__codeblock_b1p_v3s_21c">backlight: backlight {
|
||
compatible = <span class="hl-string">"pwm-backlight"</span>;
|
||
<em class="hl-comment">/* pwm node name; pwm device No.; period_ns; pwm_polarity */</em>
|
||
pwms = <&pwm <span class="hl-number">2</span> <span class="hl-number">1000000</span> <span class="hl-number">0</span>>;
|
||
brightness-levels = <<span class="hl-number">0</span> <span class="hl-number">10</span> <span class="hl-number">20</span> <span class="hl-number">30</span> <span class="hl-number">40</span> <span class="hl-number">50</span> <span class="hl-number">60</span> <span class="hl-number">70</span> <span class="hl-number">80</span> <span class="hl-number">90</span> <span class="hl-number">100</span>>;
|
||
<strong class="hl-keyword">default</strong>-brightness-level = <<span class="hl-number">8</span>>;
|
||
status = <span class="hl-string">"okay"</span>;
|
||
};</pre></div><p class="- topic/p p" data-ofbid="d190773e296__20250121171630">其中 “&pwm 2” 表示要使用 pwm2
|
||
通道作为背光控制用（要确认和硬件上的电路连接是一致的）。</p><div class="- topic/p p" data-ofbid="d190773e298__20250121171630">在屏幕 panel 节点中，需要引用
|
||
backlight：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="pwm_configuration__codeblock_jpc_w3s_21c" data-ofbid="pwm_configuration__codeblock_jpc_w3s_21c">panel_lvds {
|
||
compatible = <span class="hl-string">"artinchip,aic-general-lvds-panel"</span>;
|
||
data-mapping = <span class="hl-string">"vesa-24"</span>;
|
||
data-channel = <span class="hl-string">"single-link1"</span>;
|
||
backlight = <&backlight>;
|
||
status = <span class="hl-string">"okay"</span>;
|
||
...
|
||
};</pre></div></li></ul>
|
||
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|
||
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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="#pwm_configuration__section_hqy_23s_21c" data-tocid="pwm_configuration__section_hqy_23s_21c">内核配置</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_configuration__section_lqy_23s_21c" data-tocid="pwm_configuration__section_lqy_23s_21c">DTS 参数配置</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_configuration__section_lhg_fyn_4dc" data-tocid="pwm_configuration__section_lhg_fyn_4dc">时钟配置</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_configuration__section_sqy_23s_21c" data-tocid="pwm_configuration__section_sqy_23s_21c">D211 配置</a></div></li><li class="section-item"><div class="section-title"><a href="#pwm_configuration__section_wwx_s3s_21c" data-tocid="pwm_configuration__section_wwx_s3s_21c">Board 配置</a></div></li></ul></div>
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