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class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl_faq.html" id="id-d5856e4856-link">常见问题</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d5856e4868" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d5856e4868-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d5856e4868-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></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" 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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/lvgl/lvgl_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 3 minute(s)
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</div><div class="- topic/body body"><section class="- topic/section section" id="id__section_zk2_hpf_fdc" data-ofbid="id__section_zk2_hpf_fdc"><h2 class="- topic/title title sectiontitle">UI 图片未加载</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id2">
|
||
<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d217187e29__20250121171645">UI
|
||
界面未显示要加载的图片。</p></div>
|
||
<div class="- topic/div div section" id="id__id3">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d217187e37__20250121171645">逐步排除以下原因：</p><ol class="- topic/ol ol arabic simple" id="id__ol_vjv_nmh_fdc" data-ofbid="id__ol_vjv_nmh_fdc"><li class="- topic/li li" data-ofbid="d217187e40__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e42__20250121171645">Using File System Image 0 与 Using File System Image 1
|
||
中打包的资源文件路径是否正确。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d217187e45__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e47__20250121171645">Using File System Image 0 与 Using File System Image 1 在 image_cfg.json
|
||
中对应的分区表配置是否正确。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d217187e50__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e52__20250121171645">所需要的文件系统的编译选项是否打开，例如：Using File System Image 0 使用
|
||
fatfs。</p>
|
||
</li></ol></div>
|
||
</section><section class="- topic/section section" id="id__section_dqb_pmh_fdc" data-ofbid="id__section_dqb_pmh_fdc"><h2 class="- topic/title title sectiontitle">LVGL 线程 TIMEOUT</h2>
|
||
|
||
<div class="- topic/div div section" id="id__id4">
|
||
<strong class="+ topic/ph hi-d/b ph b">现象</strong>
|
||
<p class="- topic/p p" data-ofbid="d217187e66__20250121171645">通过 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">ps</span> 命令查看线程运行状况， LVGL 显示 TIMEOUT，但 UI
|
||
依然在正常运行。</p></div>
|
||
<div class="- topic/div div section" id="id__id5">
|
||
<strong class="+ topic/ph hi-d/b ph b">原因分析</strong>
|
||
<p class="- topic/p p" data-ofbid="d217187e77__20250121171645">通常情况下是因为 TIMEOUT 的显示是因为查看线程状态时， LVGL 刚好休眠，多次使用 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">ps</span> 命令查看，即可看到 LVGL
|
||
线程 OK 的状态。</p>
|
||
</div>
|
||
</section><section class="- topic/section section" id="id__section_jgt_qmh_fdc" data-ofbid="id__section_jgt_qmh_fdc"><h2 class="- topic/title title sectiontitle">如何优化性能</h2>
|
||
|
||
|
||
<p class="- topic/p p" data-ofbid="d217187e89__20250121171645">如需优化 LVGL 库界面开发的性能，可以按照以下建议执行：</p>
|
||
|
||
|
||
<ol class="- topic/ol ol arabic simple" id="id__ol_wjv_nmh_fdc" data-ofbid="id__ol_wjv_nmh_fdc"><li class="- topic/li li" data-ofbid="d217187e93__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e95__20250121171645">增加图片缓存。</p>
|
||
<div class="- topic/p p" data-ofbid="d217187e98__20250121171645">LVGL 内部的图片缓存机制，可以设置图片缓存张数，缓存越多速度越快，但是占用的内存也会越多，只要没有达到图片缓存张数的上限，
|
||
新的图片就会在内存中缓存下来，LVGL
|
||
在下次使用同样图片时候，就不需要重复解码，加快了显示速度。合理设置图片缓存可以显著提升性能。在内存有限的情况下，可以通过以下方式进一步优化：<ul class="- topic/ul ul" id="id__ul_udy_gnh_fdc" data-ofbid="id__ul_udy_gnh_fdc"><li class="- topic/li li" data-ofbid="d217187e101__20250121171645">根据实际需求动态调整图片缓存的大小。例如，在需要频繁切换的场景中增加缓存数量，而在其他场景中减少缓存数量。</li><li class="- topic/li li" data-ofbid="d217187e103__20250121171645">释放不必要的缓存在确定某些图片不再需要时，及时释放其缓存。例如，可以在场景切换时调用<span class="+ topic/keyword pr-d/apiname keyword apiname">lv_img_cache_invalidate_src(NULL)</span>来释放所有缓存。</li></ul><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_jnv_rmh_fdc" data-ofbid="id__codeblock_jnv_rmh_fdc"><em class="hl-comment">// 释放对象 img_obj 的图片缓存</em>
|
||
lv_img_cache_invalidate_src(lv_img_get_src(img_obj));
|
||
|
||
<em class="hl-comment">// 释放所有的图片缓存，在场景切换时候，确定不需要已有的图片缓存可以这么调用</em>
|
||
lv_img_cache_invalidate_src(NULL);</pre></div>
|
||
|
||
<div class="- topic/p p" data-ofbid="d217187e113__20250121171645">如下配置中设置了八张图片缓存：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_ytd_smh_fdc" data-ofbid="id__codeblock_ytd_smh_fdc">Application options --->
|
||
*** Filesystem related ***
|
||
[*] Using File System Image <span class="hl-number">0</span> --->
|
||
[ ] Using File System Image <span class="hl-number">1</span> ----
|
||
*** lvgl demo select related ***
|
||
-*- LVGL (official): powerful and easy-to-use embedded GUI library --->
|
||
-*- ArtInChip lvgl demo
|
||
select lvgl demo (lvgl demo with basic function) --->
|
||
(X) lvgl demo with basic function
|
||
( ) lvgl demo of meter
|
||
(<span class="hl-number">16</span>) LVGL color depth(<span class="hl-number">32</span>/<span class="hl-number">16</span>)
|
||
(<span class="hl-number">8</span>) LVGL image cached number
|
||
(/rodata/lvgl_data) LVGL Resource Directory</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d217187e119__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e121__20250121171645">选择合适的颜色深度和图片格式可以有效减少处理的数据量，例如
|
||
rgb565
|
||
格式，从而提升 UI 的处理速度。</p>
|
||
<div class="- topic/p p" data-ofbid="d217187e124__20250121171645">显示采用 rgb565 格式和 argb8888 相比减少了处理的数据量，可以提升 UI
|
||
的处理速度。以下示例中，LVGL
|
||
color depth 为 16，并且配置 framebuffer 为
|
||
rgb565：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_szv_smh_fdc" data-ofbid="id__codeblock_szv_smh_fdc">Application options --->
|
||
*** Filesystem related ***
|
||
[*] Using File System Image <span class="hl-number">0</span> --->
|
||
[ ] Using File System Image <span class="hl-number">1</span> ----
|
||
*** lvgl demo select related ***
|
||
-*- LVGL (official): powerful and easy-to-use embedded GUI library --->
|
||
-*- ArtInChip lvgl demo
|
||
select lvgl demo (lvgl demo with basic function) --->
|
||
(X) lvgl demo with basic function
|
||
( ) lvgl demo of meter
|
||
(<span class="hl-number">16</span>) LVGL color depth(<span class="hl-number">32</span>/<span class="hl-number">16</span>)
|
||
(<span class="hl-number">8</span>) LVGL image cached number
|
||
(/rodata/lvgl_data) LVGL Resource Directory</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d217187e129__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e131__20250121171645">对于不透明的图片，可以选择采用
|
||
JPEG
|
||
格。JPEG
|
||
图片的解码速度通常比
|
||
PNG
|
||
速度快。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d217187e134__20250121171645">
|
||
<div class="- topic/p p" data-ofbid="d217187e136__20250121171645">在定时器或动画回调函数中，避免执行耗时过长的函数，以免影响
|
||
UI 的流畅性。可以考虑以下方法：<ul class="- topic/ul ul" id="id__ul_f2k_14h_fdc" data-ofbid="id__ul_f2k_14h_fdc"><li class="- topic/li li" data-ofbid="d217187e139__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e141__20250121171645">LVGL 的 UI 绘制是单线程的，将耗时操作放到后台线程中执行，避免阻塞主线程。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d217187e144__20250121171645">
|
||
<p class="- topic/p p" data-ofbid="d217187e146__20250121171645">将大任务拆分成多个小任务，通过多次调用来完成，每次只处理一小部分工作。</p>
|
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</li></ul></div>
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</li></ol>
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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="#id__section_zk2_hpf_fdc" data-tocid="id__section_zk2_hpf_fdc">UI 图片未加载</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_dqb_pmh_fdc" data-tocid="id__section_dqb_pmh_fdc">LVGL 线程 TIMEOUT</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_jgt_qmh_fdc" data-tocid="id__section_jgt_qmh_fdc">如何优化性能</a></div></li></ul></div>
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