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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/display/display_backlight.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">背光设计</h1><div class="date inPage">28 Nov 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"><p class="- topic/p p" data-ofbid="d336630e22__20250121171846">Backlight 使用内核中 pwm-backlight 背光驱动，代码见
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<span class="+ topic/ph sw-d/filepath ph filepath">linux-5.10driversvideobacklightpwm_bl.c</span>。</p><p class="- topic/p p" data-ofbid="d336630e27__20250121171846">Panel 驱动可以通过 DTS 获取背光驱动的 device node，然后 backlight API 控制背光。</p><ul class="- topic/ul ul" id="display_backlight__ul_b4f_r1g_d1c" data-ofbid="display_backlight__ul_b4f_r1g_d1c"><li class="- topic/li li" data-ofbid="d336630e30__20250121171846">
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<p class="- topic/p p" data-ofbid="d336630e32__20250121171846"><span class="+ topic/keyword pr-d/apiname keyword apiname">backlight_enable()</span> 使能背光</p>
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</li><li class="- topic/li li" data-ofbid="d336630e37__20250121171846">
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<p class="- topic/p p" data-ofbid="d336630e39__20250121171846"><span class="+ topic/keyword pr-d/apiname keyword apiname">backlight_update_status()</span> 对背光状态进行更新</p>
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</li></ul><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_backlight__pre_c4f_r1g_d1c" data-ofbid="display_backlight__pre_c4f_r1g_d1c">backlight {
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compatible = <span class="hl-string">"pwm-backlight"</span>;
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<em class="hl-comment">/* pwm node name; pwm device No.; period_ns; pwm_polarity */</em>
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pwms = <&pwm <span class="hl-number">0</span> <span class="hl-number">1000000</span> PWM_POLARITY_INVERTED>;
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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>>;
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<strong class="hl-keyword">default</strong>-brightness-level = <<span class="hl-number">8</span>>;
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status = <span class="hl-string">"okay"</span>;
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};
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panel_rgb {
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compatible = <span class="hl-string">"artinchip,aic-general-rgb-panel"</span>;
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backlight = <&backlight>;
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}; <em class="hl-comment">// 为节省篇幅，已省略无关配置</em>
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</pre><div class="- topic/p p" data-ofbid="d336630e46__20250121171846">应用程序对背光进行操作：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="display_backlight__codeblock_ltt_r1g_d1c" data-ofbid="display_backlight__codeblock_ltt_r1g_d1c">echo <span class="hl-number">2</span> > /sys/class/backlight/backlight/brightness
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</pre></div></div></article></main></div>
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