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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic topic" role="article" aria-labelledby="ariaid-title1">
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<span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://aicdocco/taskstopics/sdk/bringup/lite-bringup-display_%E8%83%8C%E5%85%89%E9%85%8D%E7%BD%AE.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">背光配置</h1>
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<div class="date inPage">16 May 2025</div><div style="color: gray;">
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Read time: 1 minute(s)
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<div class="- topic/p p" data-ofbid="d85128e28__20250519091513">根据是否需要调节背光亮度，用户可以选择以下任意方式控制背光：<ul class="- topic/ul ul" id="section_ib4_x5b_bdc__ul_n4p_czb_bdc" data-ofbid="section_ib4_x5b_bdc__ul_n4p_czb_bdc">
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<li class="- topic/li li" data-ofbid="d85128e32__20250519091513"><strong class="+ topic/ph hi-d/b ph b">GPIO 控制背光</strong>：如果没有调节背光亮度需求，仅仅是亮或黑屏。<p class="- topic/p p" data-ofbid="d85128e36__20250519091513">打开 menuconfig 配置界面，选择 GPIO
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方式控制背光，以字符串的形式指定 GPIO 引脚，背光 GPIO
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引脚默认高电平有效。</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="section_ib4_x5b_bdc__pre_mb4_x5b_bdc" data-ofbid="section_ib4_x5b_bdc__pre_mb4_x5b_bdc">Board options --->
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[*] Using Display Engine (DE)
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Display Parameter --->
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panel backlight control (gpio) --->
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(PE.<span class="hl-number">19</span>) panel backlight enable pin
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[ ] panel backlight enable pin low active</pre></li>
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<li class="- topic/li li" data-ofbid="d85128e41__20250519091513"><strong class="+ topic/ph hi-d/b ph b">PWM 控制背光</strong>：如果有调节背光亮度的需求。<ol class="- topic/ol ol" id="section_ib4_x5b_bdc__ol_a1k_jzb_bdc" data-ofbid="section_ib4_x5b_bdc__ol_a1k_jzb_bdc">
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<li class="- topic/li li" data-ofbid="d85128e47__20250519091513">打开 menuconfig 配置界面。，</li>
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<li class="- topic/li li" data-ofbid="d85128e50__20250519091513">使能 PWM，选择 PWM
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方式控制背光。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="section_ib4_x5b_bdc__pre_nb4_x5b_bdc" data-ofbid="section_ib4_x5b_bdc__pre_nb4_x5b_bdc">Board options --->
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[*] Using PWM3</pre></li>
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<li class="- topic/li li" data-ofbid="d85128e55__20250519091513">配置 PWM-BACKLIGHT 的通道和默认占空比 [0,
|
||
100]<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="section_ib4_x5b_bdc__pre_ob4_x5b_bdc" data-ofbid="section_ib4_x5b_bdc__pre_ob4_x5b_bdc">Board options --->
|
||
[*] Using Display Engine (DE)
|
||
Display Parameter --->
|
||
panel backlight control (pwm) --->
|
||
(<span class="hl-number">3</span>) pwm backlight channel
|
||
(<span class="hl-number">80</span>)<strong class="hl-keyword">default</strong> brightness level</pre></li>
|
||
<li class="- topic/li li" data-ofbid="d85128e60__20250519091513">如果需要修改 PWM-BACKLIGHT 频率，如下：<p class="- topic/p p" data-ofbid="d85128e62__20250519091513">部分 PWM 频点可能会导致啸叫，修改源码
|
||
<span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv/display/panel/panel_com.c</span></p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="section_ib4_x5b_bdc__codeblock_h1v_dg4_42c" data-ofbid="section_ib4_x5b_bdc__codeblock_h1v_dg4_42c"><strong class="hl-keyword">void</strong> panel_backlight_enable(<strong class="hl-keyword">struct</strong> aic_panel *panel, u32 ms)
|
||
{
|
||
...
|
||
<em class="hl-comment">// 默认 1KHz</em>
|
||
<em class="hl-comment">/* pwm frequency: 1KHz = 1000000ns */</em>
|
||
rt_pwm_set(pwm_dev, AIC_PWM_BACKLIGHT_CHANNEL,
|
||
<span class="hl-number">1000000</span>, <span class="hl-number">10000</span> * AIC_PWM_BRIGHTNESS_LEVEL);
|
||
}</pre></li>
|
||
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