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href="../../../topics/sdk/chapter-app.html" id="concept_rcx_czh_pzb-d3752e1004-link">应用场景</a><div class="wh-tooltip"><p class="shortdesc">描述了 SDK 在不同应用场景中的配置和使用，包括系统更新、OTA、安全方案等。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e1848" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e1848-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/peripheral/peripheral-intro.html" id="id-d3752e1848-link">外设移植</a><div class="wh-tooltip"><p class="shortdesc"><span class="ph">CTP、U 盘、SD 卡、有线和无线网络</span>等外设的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e2022" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e2022-link" class="wh-expand-btn"></span><div class="title"><a 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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/advanced/hellowold.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">hellowold</h1>
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<div class="date inPage">16 May 2025</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div>
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<div class="- topic/body body">
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<div class="- topic/p p" data-ofbid="d159384e36__20250519091522">在 <span class="- topic/ph ph">Luban-Lite</span> 中有以下两种方案添加开机运行的 hellowold：<ul class="- topic/ul ul" id="id__ul_tw2_xf5_hdc" data-ofbid="id__ul_tw2_xf5_hdc">
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<li class="- topic/li li" data-ofbid="d159384e43__20250519091522">
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<p class="- topic/p p" data-ofbid="d159384e45__20250519091522"><a class="- topic/xref xref" href="hellowold.html#id__main">修改 main 函数</a></p>
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</li>
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<li class="- topic/li li" data-ofbid="d159384e51__20250519091522">
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<p class="- topic/p p" data-ofbid="d159384e53__20250519091522"><a class="- topic/xref xref" href="hellowold.html#id__id1">自动初始化</a></p>
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</li>
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</ul></div>
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<section class="- topic/section section" id="id__main" data-ofbid="id__main"><h2 class="- topic/title title sectiontitle">修改 <span class="+ topic/keyword pr-d/parmname keyword parmname">main</span> 函数</h2>
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<p class="- topic/p p" data-ofbid="d159384e68__20250519091522">SDK 默认创建了 <span class="+ topic/ph sw-d/filepath ph filepath">hellowold</span> 例程，可以直接在例程中添加私有函数逻辑：</p>
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<ul class="- topic/ul ul simple" data-ofbid="d159384e74__20250519091522">
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<li class="- topic/li li" data-ofbid="d159384e76__20250519091522">
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<p class="- topic/p p" data-ofbid="d159384e78__20250519091522"><span class="+ topic/ph sw-d/filepath ph filepath">hellowold</span> 例程代码为
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<span class="+ topic/ph sw-d/filepath ph filepath">application/rt-thread/helloworld/main.c</span>。</p>
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</li>
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<li class="- topic/li li" data-ofbid="d159384e87__20250519091522">
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<p class="- topic/p p" data-ofbid="d159384e89__20250519091522"><span class="+ topic/keyword pr-d/parmname keyword parmname">main</span> 函数是 RT-Thread 的主入口函数。</p>
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</li>
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<li class="- topic/li li" data-ofbid="d159384e95__20250519091522">
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<p class="- topic/p p" data-ofbid="d159384e97__20250519091522">例程代码目录的 <span class="+ topic/ph sw-d/filepath ph filepath">SConscript</span> 脚本默认会编译该目录中的所有 <span class="+ topic/ph sw-d/filepath ph filepath">c</span>
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文件，因此可以直接添加用户代码文件，然后在 <span class="+ topic/keyword pr-d/parmname keyword parmname">main</span> 函数中调用新添加的文件中的函数。</p>
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</li>
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</ul>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_rv3_qnq_gdc" data-ofbid="id__codeblock_rv3_qnq_gdc">application/rt-thread/helloworld/main.c | <span class="hl-number">3</span> +++
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application/rt-thread/helloworld/test.c | <span class="hl-number">15</span> +++++++++++++++
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<span class="hl-number">2</span> files changed, <span class="hl-number">18</span> insertions(+)
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create mode <span class="hl-number">100644</span> application/rt-thread/helloworld/test.c
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diff --git a/application/rt-thread/helloworld/main.c b/application/rt-thread/helloworld/main.c
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index <span class="hl-number">0</span>dadb95e2.<span class="hl-number">.003233588</span> <span class="hl-number">100644</span>
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--- a/application/rt-thread/helloworld/main.c
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+++ b/application/rt-thread/helloworld/main.c
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@@ -<span class="hl-number">20</span>,<span class="hl-number">6</span> +<span class="hl-number">20</span>,<span class="hl-number">8</span> @@
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#include <boot_param.h>
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#endif
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+<strong class="hl-keyword">extern</strong> <strong class="hl-keyword">void</strong> helloworld();
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+
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<strong class="hl-keyword">int</strong> main(<strong class="hl-keyword">void</strong>)
|
||
{
|
||
#ifdef AIC_AB_SYSTEM_INTERFACE
|
||
@@ -<span class="hl-number">48</span>,<span class="hl-number">5</span> +<span class="hl-number">50</span>,<span class="hl-number">6</span> @@ <strong class="hl-keyword">int</strong> main(<strong class="hl-keyword">void</strong>)
|
||
#ifdef ULOG_USING_FILTER
|
||
ulog_global_filter_lvl_set(ULOG_OUTPUT_LVL);
|
||
#endif
|
||
+ helloworld();
|
||
<strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
}
|
||
diff --git a/application/rt-thread/helloworld/test.c b/application/rt-thread/helloworld/test.c
|
||
new file mode <span class="hl-number">100644</span>
|
||
index <span class="hl-number">000000000.</span><span class="hl-number">.634</span>da82e6
|
||
--- /dev/null
|
||
+++ b/application/rt-thread/helloworld/test.c
|
||
@@ -<span class="hl-number">0</span>,<span class="hl-number">0</span> +<span class="hl-number">1</span>,<span class="hl-number">15</span> @@
|
||
+#include <rtthread.h>
|
||
+#include <stdio.h>
|
||
+
|
||
+<strong class="hl-keyword">void</strong> helloworld()
|
||
+{
|
||
+ printf(<span class="hl-string">"Hello World!\n"</span>);
|
||
+}
|
||
--
|
||
<span class="hl-number">2.29</span>.<span class="hl-number">0</span></pre>
|
||
</section>
|
||
<section class="- topic/section section" id="id__id1" data-ofbid="id__id1"><h2 class="- topic/title title sectiontitle">自动初始化</h2>
|
||
<p class="- topic/p p" data-ofbid="d159384e119__20250519091522">RT-Thread 的自动初始化机制是指初始化函数不需要被显式调用，只需要在函数定义处通过宏定义的方式进行申明，
|
||
则该函数在系统启动过程中将被顺序执行：</p>
|
||
<ul class="- topic/ul ul simple" data-ofbid="d159384e122__20250519091522">
|
||
<li class="- topic/li li" data-ofbid="d159384e124__20250519091522">
|
||
<p class="- topic/p p" data-ofbid="d159384e126__20250519091522">代码可以在任意地方声明和编译</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159384e130__20250519091522">
|
||
<p class="- topic/p p" data-ofbid="d159384e132__20250519091522">通过 <span class="+ topic/keyword pr-d/apiname keyword apiname">INIT_APP_EXPORT</span> 申明</p>
|
||
</li>
|
||
</ul>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_pyz_qnq_gdc" data-ofbid="id__codeblock_pyz_qnq_gdc">diff --git a/application/rt-thread/helloworld/test.c b/application/rt-thread/helloworld/test.c
|
||
new file mode <span class="hl-number">100644</span>
|
||
index <span class="hl-number">000000000.</span><span class="hl-number">.18e</span>b0821f
|
||
--- /dev/null
|
||
+++ b/application/rt-thread/helloworld/test.c
|
||
@@ -<span class="hl-number">0</span>,<span class="hl-number">0</span> +<span class="hl-number">1</span>,<span class="hl-number">10</span> @@
|
||
+#include <rtthread.h>
|
||
+#include <stdio.h>
|
||
+
|
||
+<strong class="hl-keyword">int</strong> helloworld(<strong class="hl-keyword">void</strong>)
|
||
+{
|
||
+ printf(<span class="hl-string">"Hello World!\n"</span>);
|
||
+ <strong class="hl-keyword">return</strong> <span class="hl-number">0</span>;
|
||
+}
|
||
+
|
||
+INIT_APP_EXPORT(helloworld);</pre>
|
||
</section>
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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__main" data-tocid="id__main">修改 <span class="+ topic/keyword pr-d/parmname keyword parmname">main</span> 函数</a></div></li><li class="section-item"><div class="section-title"><a href="#id__id1" data-tocid="id__id1">自动初始化</a></div></li></ul></div>
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