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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/lvgl/lvgl-connecting-display.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">显示对接</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
|
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Read time: 5 minute(s)
|
||
</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d119801e24__20250121171558">LVGL 显示对接主要包括以下步骤和流程：</p><ol class="- topic/ol ol arabic simple" id="lvgl-connecting-display__ol_b1h_1zf_fdc" data-ofbid="lvgl-connecting-display__ol_b1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d119801e27__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e29__20250121171558">绘制 buffer 初始化，用于存储当前帧的图像数据，并在需要时进行交换。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e32__20250121171558">
|
||
<div class="- topic/p p" data-ofbid="d119801e34__20250121171558">flush_cb 对接，刷新回调函数，用于将绘制缓冲区的数据发送到显示屏。刷新回调函数又分为以下两种模式：<ul class="- topic/ul ul" id="lvgl-connecting-display__ul_txy_3sg_fdc" data-ofbid="lvgl-connecting-display__ul_txy_3sg_fdc"><li class="- topic/li li" data-ofbid="d119801e37__20250121171558">全刷新</li><li class="- topic/li li" data-ofbid="d119801e39__20250121171558">局部刷新</li></ul></div>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e42__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e44__20250121171558">2D 硬件加速对接。</p>
|
||
<p class="- topic/p p" data-ofbid="d119801e47__20250121171558">为了提高绘图性能，可以将部分绘图操作进行硬件加速。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e50__20250121171558">将上述所有配置注册到 LVGL 中。</li></ol><section class="- topic/section section" id="lvgl-connecting-display__id7" data-ofbid="lvgl-connecting-display__id7"><h2 class="- topic/title title sectiontitle">绘制 buffer 初始化</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d119801e57__20250121171558">在 LVGL（Light and Versatile Graphics Library）中，绘制缓冲区（draw
|
||
buffer）的初始化是显示设备配置的重要步骤之一。双缓冲模式可以提高图形界面的刷新效率和流畅度。绘制 buffer
|
||
初始化函数如下:<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_rml_g1g_fdc" data-ofbid="lvgl-connecting-display__codeblock_rml_g1g_fdc"><strong class="hl-keyword">void</strong> lv_disp_draw_buf_init(lv_disp_draw_buf_t * draw_buf, <strong class="hl-keyword">void</strong> * buf1, <strong class="hl-keyword">void</strong> * buf2, uint32_t size_in_px_cnt)</pre></div>
|
||
<ul class="- topic/ul ul simple" id="lvgl-connecting-display__ul_c1h_1zf_fdc" data-ofbid="lvgl-connecting-display__ul_c1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d119801e63__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e65__20250121171558">buf1：无论选择单缓冲或多缓冲，必须设置此 buffer。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e68__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e70__20250121171558">buf2：选择双缓冲时，需要配置此 buffer，单缓冲不需要配置。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e73__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e75__20250121171558">size_in_px_cnt：以像素为单位的 buf 大小，应该根据实际的分辨率来计算。</p>
|
||
</li></ul>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-connecting-display__id16" data-ofbid="lvgl-connecting-display__id16"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-connecting-display__image_d1h_1zf_fdc" src="../../../images/lvgl/double_frame.png" alt="double_frame1"/></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">双缓冲</span></figcaption></figure>
|
||
</section><section class="- topic/section section" id="lvgl-connecting-display__flush-cb" data-ofbid="lvgl-connecting-display__flush-cb"><h2 class="- topic/title title sectiontitle">flush_cb 对接</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d119801e91__20250121171558">以双缓冲为例，flush_cb 回调函数的处理流程分别如下所示，包括 full_refresh 和 direct_mode 两种绘制模式：</p>
|
||
<ol class="- topic/ol ol arabic simple" id="lvgl-connecting-display__ol_e1h_1zf_fdc" data-ofbid="lvgl-connecting-display__ol_e1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d119801e95__20250121171558">
|
||
<div class="- topic/p p" data-ofbid="d119801e97__20250121171558">full_refresh：即全刷新模式，每一帧都刷新整个显示屏。流程如下：<ol class="- topic/ol ol" type="a" id="lvgl-connecting-display__ul_ufh_55g_fdc" data-ofbid="lvgl-connecting-display__ul_ufh_55g_fdc"><li class="- topic/li li" data-ofbid="d119801e100__20250121171558">直接通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">pan_display</span> 接口将当前绘制缓冲区（draw
|
||
buffer）发送到显示设备。</li><li class="- topic/li li" data-ofbid="d119801e105__20250121171558">等待垂直同步（vsync）中断，确保数据已经显示在屏幕上。</li><li class="- topic/li li" data-ofbid="d119801e107__20250121171558">调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_flush_ready</span> 通知 LVGL 框架刷新结束。</li><li class="- topic/li li" data-ofbid="d119801e112__20250121171558">LVGL 框架会自动交换绘制缓冲区。</li></ol></div>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-connecting-display__id17" data-ofbid="lvgl-connecting-display__id17"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-connecting-display__image_f1h_1zf_fdc" src="../../../images/lvgl/full_flush_cb1.png" alt="full_flush_cb1"/></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">全刷新模式下 flush_cb 回调函数的处理流程</span></figcaption></figure>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e122__20250121171558">
|
||
<div class="- topic/p p" data-ofbid="d119801e124__20250121171558">direct_mode：即局部刷新，每一帧只刷新需要更新的无效区域（可以有多个无效区域）。流程如下：<ol class="- topic/ol ol" type="a" id="lvgl-connecting-display__ul_l52_y5g_fdc" data-ofbid="lvgl-connecting-display__ul_l52_y5g_fdc"><li class="- topic/li li" data-ofbid="d119801e127__20250121171558">遍历所有无效区域，例如 <span class="+ topic/keyword pr-d/apiname keyword apiname">invalid area0</span> 和 <span class="+ topic/keyword pr-d/apiname keyword apiname">invalid
|
||
area1</span>，将每个无效区域的数据从绘制缓冲区发送到显示设备。</li><li class="- topic/li li" data-ofbid="d119801e135__20250121171558">最后一个无效区域处理完毕后，调用 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_flush_ready</span> 通知 LVGL
|
||
框架刷新结束。</li><li class="- topic/li li" data-ofbid="d119801e140__20250121171558">LVGL 框架会自动交换绘制缓冲区。</li></ol></div>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-connecting-display__id18" data-ofbid="lvgl-connecting-display__id18"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-connecting-display__image_h1h_1zf_fdc" src="../../../images/lvgl/invalid_area.png" alt="invalid_area1.png"/></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"> 3</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">无效区域</span></figcaption></figure>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-connecting-display__id19" data-ofbid="lvgl-connecting-display__id19"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-connecting-display__image_i1h_1zf_fdc" src="../../../images/lvgl/direct_flush_cb.png" alt="direct_flush_cb1"/></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"> 4</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">局部刷新模式下 flush_cb 回调函数的处理流程</span></figcaption></figure>
|
||
<div class="- topic/p p" data-ofbid="d119801e157__20250121171558"><span class="+ topic/keyword pr-d/apiname keyword apiname">flush_cb</span>
|
||
的实现代码 <span class="+ topic/keyword pr-d/apiname keyword apiname">fbdev_flush</span>
|
||
如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_ybv_31g_fdc" data-ofbid="lvgl-connecting-display__codeblock_ybv_31g_fdc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">void</strong> fbdev_flush(lv_disp_drv_t * drv, <strong class="hl-keyword">const</strong> lv_area_t * area, lv_color_t *color_p)
|
||
{
|
||
<strong class="hl-keyword">int</strong> index = <span class="hl-number">0</span>;
|
||
lv_disp_t * disp = _lv_refr_get_disp_refreshing();
|
||
lv_disp_draw_buf_t * draw_buf = lv_disp_get_draw_buf(disp);
|
||
|
||
<strong class="hl-keyword">if</strong> (!disp->driver->direct_mode || draw_buf->flushing_last) {
|
||
<strong class="hl-keyword">if</strong> (disp->driver->direct_mode)
|
||
aicos_dcache_clean_invalid_range((<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> *)info.framebuffer, (<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong>)info.smem_len * <span class="hl-number">2</span>);
|
||
<strong class="hl-keyword">else</strong>
|
||
aicos_dcache_clean_invalid_range((<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong> *)color_p, (<strong class="hl-keyword">unsigned</strong> <strong class="hl-keyword">long</strong>)info.smem_len);
|
||
|
||
<strong class="hl-keyword">if</strong> ((<strong class="hl-keyword">void</strong> *)color_p == (<strong class="hl-keyword">void</strong> *)info.framebuffer)
|
||
index = <span class="hl-number">0</span>;
|
||
<strong class="hl-keyword">else</strong>
|
||
index = <span class="hl-number">1</span>;
|
||
|
||
mpp_fb_ioctl(g_fb, AICFB_PAN_DISPLAY , &index);
|
||
mpp_fb_ioctl(g_fb, AICFB_WAIT_FOR_VSYNC, <span class="hl-number">0</span>);
|
||
|
||
<strong class="hl-keyword">if</strong> (drv->direct_mode == <span class="hl-number">1</span>) {
|
||
<strong class="hl-keyword">for</strong> (<strong class="hl-keyword">int</strong> i = <span class="hl-number">0</span>; i < disp->inv_p; i++) {
|
||
<strong class="hl-keyword">if</strong> (disp->inv_area_joined[i] == <span class="hl-number">0</span>) {
|
||
sync_disp_buf(drv, color_p, &disp->inv_areas[i]);
|
||
}
|
||
}
|
||
}
|
||
|
||
lv_disp_flush_ready(drv);
|
||
}
|
||
<strong class="hl-keyword">else</strong> {
|
||
lv_disp_flush_ready(drv);
|
||
}
|
||
}</pre></div>
|
||
</li></ol>
|
||
</section><section class="- topic/section section" id="lvgl-connecting-display__section_pqd_1tg_fdc" data-ofbid="lvgl-connecting-display__section_pqd_1tg_fdc"><h2 class="- topic/title title sectiontitle">2D 硬件加速对接</h2>
|
||
|
||
|
||
<div class="- topic/p p" data-ofbid="d119801e178__20250121171558">在 LVGL 中，硬件加速的实现可以显著提高图形绘制的性能。2D 加速主要对接 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_draw_ctx_t</span>
|
||
中的绘制函数，并对接相应的硬件加速接口。以下是详细的步骤：<ol class="- topic/ol ol" id="lvgl-connecting-display__ol_cms_5vg_fdc" data-ofbid="lvgl-connecting-display__ol_cms_5vg_fdc"><li class="- topic/li li" data-ofbid="d119801e184__20250121171558">在 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_draw_aic_ctx_t</span> 结构体中包含
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">lv_draw_ctx_t</span> 和 <span class="+ topic/keyword pr-d/apiname keyword apiname">blend</span>
|
||
函数。<p class="- topic/p p" data-ofbid="d119801e195__20250121171558"><span class="+ topic/keyword pr-d/apiname keyword apiname">lv_draw_aic_ctx_t</span> 是一个包含了硬件加速功能的上下文结构体，继承自
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">lv_draw_sw_ctx_t</span>
|
||
并添加了硬件加速所需的成员函数。关于详细绘制函数的说明，可查看<a class="- topic/xref xref" href="lvgl-connecting-display.html#lvgl-connecting-display__table_j1h_1zf_fdc"> lv_draw_ctx_t 中的绘制函数</a>。</p><div class="- topic/p p" data-ofbid="d119801e206__20250121171558">
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_alt_j1g_fdc" data-ofbid="lvgl-connecting-display__codeblock_alt_j1g_fdc"><strong class="hl-keyword">typedef</strong> <strong class="hl-keyword">struct</strong> {
|
||
lv_draw_ctx_t base_draw;
|
||
|
||
<span class="hl-tag-doctype-comment">/** Fill an area of the destination buffer with a color*/</span>
|
||
<strong class="hl-keyword">void</strong> (*blend)(lv_draw_ctx_t * draw_ctx, <strong class="hl-keyword">const</strong> lv_draw_sw_blend_dsc_t * dsc);
|
||
} lv_draw_sw_ctx_t;</pre>
|
||
</div></li><li class="- topic/li li" data-ofbid="d119801e211__20250121171558">
|
||
<div class="- topic/p p" data-ofbid="d119801e213__20250121171558">初始化 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_draw_aic_ctx_t</span>
|
||
硬件加速上下文结构体，并将软件实现的绘制函数替换为硬件加速版本的函数。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_cd1_k1g_fdc" data-ofbid="lvgl-connecting-display__codeblock_cd1_k1g_fdc"><strong class="hl-keyword">void</strong> lv_draw_aic_ctx_init(lv_disp_drv_t * drv, lv_draw_ctx_t * draw_ctx)
|
||
{
|
||
lv_draw_sw_init_ctx(drv, draw_ctx);
|
||
lv_draw_aic_ctx_t * aic_draw_ctx = (lv_draw_aic_ctx_t *)draw_ctx;
|
||
|
||
aic_draw_ctx->blend = lv_draw_aic_blend;
|
||
aic_draw_ctx->base_draw.draw_img = lv_draw_aic_draw_img;
|
||
aic_draw_ctx->base_draw.draw_img_decoded = lv_draw_aic_img_decoded;
|
||
|
||
<strong class="hl-keyword">return</strong>;
|
||
}</pre></div>
|
||
<p class="- topic/p p" data-ofbid="d119801e221__20250121171558">draw_rect、draw_line 等接口操作的功能由多个步骤组成，虽然未进行硬件加速，但是操作的部分实现会调用到 blend，而 blend
|
||
接口进行了硬件加速对接。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e224__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e226__20250121171558">实现硬件加速的 blend 函数，该函数会调用底层硬件加速 API 来实现高效的混合操作。</p>
|
||
<p class="- topic/p p" data-ofbid="d119801e229__20250121171558">先调用 lv_draw_sw_init_ctx 函数把所有绘制操作都初始化为软件实现，对可以硬件加速的接口重新实现， 覆盖原来的软件实现。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e232__20250121171558">继续实现其他硬件加速的绘制函数，例如 <span class="+ topic/keyword pr-d/apiname keyword apiname">draw_img</span> 和
|
||
<span class="+ topic/keyword pr-d/apiname keyword apiname">draw_img_decoded</span>。</li></ol></div>
|
||
<div class="table-container"><table class="- topic/table table frame-all" id="lvgl-connecting-display__table_j1h_1zf_fdc" data-ofbid="lvgl-connecting-display__table_j1h_1zf_fdc" data-cols="3"><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"> lv_draw_ctx_t 中的绘制函数</span></caption><colgroup><col style="width:38.655462184873954%"/><col style="width:40.33613445378151%"/><col style="width:21.008403361344538%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">成员</th><th class="- topic/entry entry colsep-1 rowsep-1" id="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">说明</th><th class="- topic/entry entry colsep-0 rowsep-1" id="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">是否硬件加速</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void *buf</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">当前要绘制的 buffer</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">
|
||
<em class="+ topic/ph hi-d/i ph i">-</em>
|
||
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">const lv_area_t * clip_area</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制区域裁剪（以屏幕为参考的绝对坐标）</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">
|
||
<em class="+ topic/ph hi-d/i ph i">-</em>
|
||
</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void (*draw_rect)()</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制矩形（包括圆角、阴影、渐变等）</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void (*draw_arc)()</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制弧形</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void (*draw_img_decoded)()</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制已经解码后的图像</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">是</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">lv_res_t (*draw_img)()</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制图像（包括图片解码）</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">是</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void (*draw_letter)()</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制文字</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void (*draw_line)()</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制直线</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">否</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__1">void (*draw_polygon)()</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__2">绘制多边形</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="lvgl-connecting-display__table_j1h_1zf_fdc__entry__3">否</td></tr></tbody></table></div>
|
||
</section><section class="- topic/section section" id="lvgl-connecting-display__id8" data-ofbid="lvgl-connecting-display__id8"><h2 class="- topic/title title sectiontitle">显示驱动注册</h2>
|
||
|
||
<ol class="- topic/ol ol arabic simple" id="lvgl-connecting-display__ol_k1h_1zf_fdc" data-ofbid="lvgl-connecting-display__ol_k1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d119801e333__20250121171558">
|
||
<div class="- topic/p p" data-ofbid="d119801e335__20250121171558">通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_drv_init</span> 来初始化 <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_drv_t</span>
|
||
结构体。<div class="- topic/note note note note_note" id="lvgl-connecting-display__note_exc_vxg_fdc" data-ofbid="lvgl-connecting-display__note_exc_vxg_fdc"><span class="note__title">注：</span> <span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_drv_t</span>包含了所有与显示相关的配置信息，详情可查看<a class="- topic/xref xref" href="#lvgl-connecting-display__p_tsg_xxg_fdc"><span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_drv_t</span>
|
||
结构体代码</a></div></div>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e354__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e356__20250121171558">通过 lv_disp_draw_buf_init 初始化绘制 buffer。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e359__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e361__20250121171558">通过回调 flush_cb 来注册显示接口。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e364__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e366__20250121171558">通过 lv_draw_aic_ctx_init 来注册 2D 硬件加速相关接口。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d119801e370__20250121171558">
|
||
<p class="- topic/p p" data-ofbid="d119801e372__20250121171558">通过 lv_disp_drv_register 来注册 lv_disp_drv_t。</p>
|
||
</li></ol>
|
||
|
||
<div class="- topic/p p" data-ofbid="d119801e378__20250121171558">上述代码中表示目前是局部刷新模式：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_wvw_l1g_fdc" data-ofbid="lvgl-connecting-display__codeblock_wvw_l1g_fdc">disp_drv.full_refresh = <span class="hl-number">0</span>;
|
||
disp_drv.direct_mode = <span class="hl-number">1</span>;</pre></div>
|
||
<div class="- topic/p p" data-ofbid="d119801e383__20250121171558">全刷新模式参数配置如下：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_of1_l1g_fdc" data-ofbid="lvgl-connecting-display__codeblock_of1_l1g_fdc">disp_drv.full_refresh = <span class="hl-number">1</span>;
|
||
disp_drv.direct_mode = <span class="hl-number">0</span>;</pre></div>
|
||
<div class="- topic/p p" id="lvgl-connecting-display__p_tsg_xxg_fdc" data-ofbid="lvgl-connecting-display__p_tsg_xxg_fdc"><span class="+ topic/keyword pr-d/apiname keyword apiname">lv_disp_drv_t</span>
|
||
结构体代码示例如下所示：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-connecting-display__codeblock_sgp_k1g_fdc" data-ofbid="lvgl-connecting-display__codeblock_sgp_k1g_fdc"><strong class="hl-keyword">static</strong> lv_disp_drv_t disp_drv;
|
||
<strong class="hl-keyword">void</strong> lv_port_disp_init(<strong class="hl-keyword">void</strong>)
|
||
{
|
||
<strong class="hl-keyword">void</strong> *buf1 = RT_NULL;
|
||
<strong class="hl-keyword">void</strong> *buf2 = RT_NULL;
|
||
uint32_t fb_Size;
|
||
rt_err_t result;
|
||
|
||
g_fb = mpp_fb_open();
|
||
<strong class="hl-keyword">if</strong> (g_fb == <span class="hl-number">0</span>) {
|
||
LOG_E(<span class="hl-string">"can't find aic framebuffer device!"</span>);
|
||
<strong class="hl-keyword">return</strong>;
|
||
}
|
||
|
||
result = mpp_fb_ioctl(g_fb, AICFB_GET_SCREENINFO, &info);
|
||
<strong class="hl-keyword">if</strong> (result != RT_EOK) {
|
||
LOG_E(<span class="hl-string">"get device fb info failed!"</span>);
|
||
<strong class="hl-keyword">return</strong>;
|
||
}
|
||
|
||
g_ge = mpp_ge_open();
|
||
<strong class="hl-keyword">if</strong> (!g_ge) {
|
||
LOG_E(<span class="hl-string">"ge open fail\n"</span>);
|
||
<strong class="hl-keyword">return</strong>;
|
||
}
|
||
|
||
fb_Size = info.height * info.stride;
|
||
buf1 = (<strong class="hl-keyword">void</strong> *)info.framebuffer;
|
||
buf2 = (<strong class="hl-keyword">void</strong> *)((uint8_t *)info.framebuffer + fb_Size);
|
||
lv_disp_draw_buf_init(&disp_buf, buf2, buf1,
|
||
info.width * info.height);
|
||
lv_disp_drv_init(&disp_drv);
|
||
|
||
<em class="hl-comment">/*Set a display buffer*/</em>
|
||
disp_drv.draw_buf = &disp_buf;
|
||
|
||
<em class="hl-comment">/*Set the resolution of the display*/</em>
|
||
disp_drv.hor_res = info.width;
|
||
disp_drv.ver_res = info.height;
|
||
disp_drv.full_refresh = <span class="hl-number">0</span>;
|
||
disp_drv.direct_mode = <span class="hl-number">1</span>;
|
||
disp_drv.flush_cb = fbdev_flush;
|
||
disp_drv.draw_ctx_init = lv_draw_aic_ctx_init;
|
||
disp_drv.draw_ctx_deinit = lv_draw_aic_ctx_deinit;
|
||
disp_drv.draw_ctx_size = <strong class="hl-keyword">sizeof</strong>(lv_draw_aic_ctx_t);
|
||
|
||
<em class="hl-comment">/*Finally register the driver*/</em>
|
||
lv_disp_drv_register(&disp_drv);
|
||
}</pre></div>
|
||
</section></div></article></main></div>
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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="#lvgl-connecting-display__id7" data-tocid="lvgl-connecting-display__id7">绘制 buffer 初始化</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-connecting-display__flush-cb" data-tocid="lvgl-connecting-display__flush-cb">flush_cb 对接</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-connecting-display__section_pqd_1tg_fdc" data-tocid="lvgl-connecting-display__section_pqd_1tg_fdc">2D 硬件加速对接</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-connecting-display__id8" data-tocid="lvgl-connecting-display__id8">显示驱动注册</a></div></li></ul></div>
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