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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/mdi/mdi_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">参数配置</h1><div class="date inPage">5 Dec 2024</div><div style="color: gray;">
Read time: 2 minute(s)
</div><div class="- topic/body body"><div class="- topic/p p" data-ofbid="d111120e17__20250121171551">按照以下流程，配置 MDI 驱动模块及相关参数：<ol class="- topic/ol ol" id="id__ol_jjy_5rt_2dc" data-ofbid="id__ol_jjy_5rt_2dc"><li class="- topic/li li" data-ofbid="d111120e20__20250121171551">
<div class="- topic/p p" data-ofbid="d111120e22__20250121171551">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
的功能配置界面，按如下选择，打开 MPP VIN DevMode：<div class="- topic/note note note note_note" id="id__note_onm_fst_2dc" data-ofbid="id__note_onm_fst_2dc"><span class="note__title">注：</span> MDI 驱动依赖 MPP 中的
VIN 子模块，而且用到的是其中的
DevMode，需要提前打开。</div><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_xn1_4rt_2dc" data-ofbid="id__codeblock_xn1_4rt_2dc">Local packages options ---&gt;
ArtInChip packages options ---&gt;
[*] aic-mpp ---&gt;
[*] Enable Video Input interface of DevMode
(<span class="hl-number">6278400</span>) Size of Video Input buffer</pre></div>
<p class="- topic/p p" data-ofbid="d111120e35__20250121171551">其中 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">Size of Video Input buffer</span>
需要根据应用场景的图像数据格式来计算。关于详细计算说明，可查看<a class="- topic/xref xref" href="mdi_config.html#id__section_s15_dst_2dc">MDI 应用场景及资源需求</a>。</p>
</li><li class="- topic/li li" data-ofbid="d111120e45__20250121171551">在 <span class="- topic/ph ph">Luban-Lite</span> 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">scons --menuconfig</span>，进入 menuconfig
的功能配置界面，按如下选择，打开 MDI 驱动<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_ddm_hst_2dc" data-ofbid="id__codeblock_ddm_hst_2dc">Board options ---&gt;
[*] Using MDI
(PE.<span class="hl-number">11</span>) Busy signal PIN
[*] Data sequence is First-In-First-Save</pre><ul class="- topic/ul ul simple" id="id__ul_ihk_mrt_2dc" data-ofbid="id__ul_ihk_mrt_2dc"><li class="- topic/li li" data-ofbid="d111120e56__20250121171551">
<p class="- topic/p p" data-ofbid="d111120e58__20250121171551">
<span class="+ topic/ph ui-d/uicontrol ph uicontrol">Busy
signal
PIN</span>：用于向 Host 发送 Busy 信号，默认值 PE.11 在
D12x 中并不存在，需要根据实际板级电路修改此参数。</p>
</li><li class="- topic/li li" data-ofbid="d111120e64__20250121171551">
<p class="- topic/p p" data-ofbid="d111120e66__20250121171551">
<span class="+ topic/ph ui-d/uicontrol ph uicontrol">Data sequence is
First-In-First-Save</span>：用于调整输入信号的存放顺序，取决于数据源格式和数据线的排布方式。</p>
</li></ul></li></ol></div><section class="- topic/section section" id="id__section_s15_dst_2dc" data-ofbid="id__section_s15_dst_2dc"><h2 class="- topic/title title sectiontitle">MDI 应用场景及资源需求</h2>
<p class="- topic/p p" data-ofbid="d111120e77__20250121171551">为了覆盖大部分场景， <span class="+ topic/ph ui-d/uicontrol ph uicontrol">Size of Video Input buffer</span>
<strong class="+ topic/ph hi-d/b ph b">默认值使用输入 640*480、RGB888 格式计算得到 6278400</strong>，如果输入超过 640*480、RGB888 的资源需求，就需要调大此
Buffer。用户可以参考<a class="- topic/xref xref" href="../../../external-references/MDI_buf_size.xlsx">MDIBuf 资源需求的计算表</a> 的数据源格式、显示格式来计算 Buf 资源的需求。</p>
<p class="- topic/p p" data-ofbid="d111120e90__20250121171551">MDI 应用场景及资源需求的详细说明如下所示：</p>
<div class="- topic/div div section" id="id__mpp-vin-devmode">
<div class="- topic/div div section" id="id__mdi-de"><strong class="+ topic/ph hi-d/b ph b">MDI -&gt; DE 场景的资源需求</strong>
<p class="- topic/p p" data-ofbid="d111120e99__20250121171551">MDI 取到的数据放入 Buffer 队列，该 Buffer 队列会直接交给 DE 去显示。 运行过程中为了流畅度，<strong class="+ topic/ph hi-d/b ph b">Buffer 队列需要的
Buffer 数量至少是 3</strong>。</p><p class="- topic/p p" data-ofbid="d111120e104__20250121171551">Buffer 的大小主要取决于 Framebuffer 的图像格式，下表以 1024*600
显示分辨率列举一些情况：</p><div class="table-container"><table class="- topic/table table frame-all" id="id__table_dhk_mrt_2dc" data-ofbid="id__table_dhk_mrt_2dc" 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"></span></caption><colgroup><col style="width:21.598272138228943%"/><col style="width:24.406047516198704%"/><col style="width:24.838012958963283%"/><col style="width:29.157667386609077%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_dhk_mrt_2dc__entry__1">FB 格式</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_dhk_mrt_2dc__entry__2">Buffer Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_dhk_mrt_2dc__entry__3">Buffer 个数</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_dhk_mrt_2dc__entry__4">总的 RAM 需求</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_dhk_mrt_2dc__entry__1">RGB565</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_dhk_mrt_2dc__entry__2">1,228,800</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_dhk_mrt_2dc__entry__3">3</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_dhk_mrt_2dc__entry__4">3,686,400</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_dhk_mrt_2dc__entry__1">RGB888</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_dhk_mrt_2dc__entry__2">1,843,200</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_dhk_mrt_2dc__entry__3">3</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_dhk_mrt_2dc__entry__4">5,529,600</td></tr></tbody></table></div></div>
<div class="- topic/div div section" id="id__mdi-ge-de">
<strong class="+ topic/ph hi-d/b ph b">MDI -&gt; GE -&gt; DE 场景的资源需求</strong>
<p class="- topic/p p" data-ofbid="d111120e148__20250121171551">MDI 取到的数据先放入 Buffer 队列，该 Buffer 队列会交给 GE 去处理，然后 GE 输出到一对乒乓 Buffer，乒乓 Buffer
再转交 DE 去显示。 同上，运行过程中为了流畅度，Buffer 队列需要的 Buffer 数量至少是 3。</p><p class="- topic/p p" data-ofbid="d111120e150__20250121171551">这种场景要分两部分去计算
Buffer 需求： Buffer 总大小=Buffer 队列的大小+乒乓 Buffer 的大小</p><ol class="- topic/ol ol arabic simple" id="id__ol_ehk_mrt_2dc" data-ofbid="id__ol_ehk_mrt_2dc"><li class="- topic/li li" data-ofbid="d111120e153__20250121171551">
<div class="- topic/p p" data-ofbid="d111120e155__20250121171551">Buffer 队列中，单个 Buffer 的大小取决于 MDI 的输入图像格式。下表是一些格式举例：<div class="table-container"><table class="- topic/table table frame-all" id="id__table_fhk_mrt_2dc" data-ofbid="id__table_fhk_mrt_2dc" data-cols="5"><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"></span></caption><colgroup><col style="width:18.26241134751773%"/><col style="width:19.326241134751772%"/><col style="width:21.98581560283688%"/><col style="width:22.69503546099291%"/><col style="width:17.730496453900706%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_fhk_mrt_2dc__entry__1">输入格式</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_fhk_mrt_2dc__entry__2">输入分辨率</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_fhk_mrt_2dc__entry__3">输入 Buffer Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_fhk_mrt_2dc__entry__4">输入 Buffre 个数</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_fhk_mrt_2dc__entry__5">RAM 需求</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__1">RGB565</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__2">320*480</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__3">307,200</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__4">3</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__5">921,600</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__1">RGB888</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__2">320*480</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__3">460,800</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__4">3</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__5">1,382,400</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__1">RGB565</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__2">640*480</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__3">921,600</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__4">3</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_fhk_mrt_2dc__entry__5">1,728,000</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_fhk_mrt_2dc__entry__1">RGB888</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_fhk_mrt_2dc__entry__2">640*480</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_fhk_mrt_2dc__entry__3">921,600</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_fhk_mrt_2dc__entry__4">3</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_fhk_mrt_2dc__entry__5">2,592,000</td></tr></tbody></table></div></div>
<div class="- topic/note note note note_note" id="id__note_xgp_qn3_ddc" data-ofbid="id__note_xgp_qn3_ddc"><span class="note__title">注：</span>
<p class="- topic/p p" data-ofbid="d111120e225__20250121171551">在 <strong class="+ topic/ph hi-d/b ph b">局部刷新</strong> 的场景中，需要用一块 Buffer 来当作背景图的备份，所以在上表基础上 Buffer 队列中的
Buffer 个数需要再加一。</p>
</div>
</li><li class="- topic/li li" data-ofbid="d111120e232__20250121171551">
<div class="- topic/p p" data-ofbid="d111120e234__20250121171551">乒乓 Buffer 中，单个 Buffer 的大小取决于 DE 的图像格式。下表是一些格式举例：<div class="table-container"><table class="- topic/table table frame-all" id="id__table_hhk_mrt_2dc" data-ofbid="id__table_hhk_mrt_2dc" 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"> 3</span><span class="table--title-label-punctuation">. </span></span><span class="table--title"></span></caption><colgroup><col style="width:24.39024390243903%"/><col style="width:26.829268292682933%"/><col style="width:24.39024390243903%"/><col style="width:24.39024390243903%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_hhk_mrt_2dc__entry__1">FB 格式</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_hhk_mrt_2dc__entry__2">Buffer Size</th><th class="- topic/entry entry colsep-1 rowsep-1" id="id__table_hhk_mrt_2dc__entry__3">Buffer 个数</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__table_hhk_mrt_2dc__entry__4">RAM 需求</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_hhk_mrt_2dc__entry__1">RGB565</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_hhk_mrt_2dc__entry__2">1,228,800</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__table_hhk_mrt_2dc__entry__3">2</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__table_hhk_mrt_2dc__entry__4">2,457,600</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_hhk_mrt_2dc__entry__1">RGB888</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_hhk_mrt_2dc__entry__2">1,843,200</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__table_hhk_mrt_2dc__entry__3">2</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__table_hhk_mrt_2dc__entry__4">3,686,400</td></tr></tbody></table></div></div>
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