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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/uart/uart_config.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">UART 配置</h1><div class="date inPage">16 Dec 2024</div><div style="color: gray;">
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Read time: 2 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="uart_configuration__section_n5y_3zy_21c" data-ofbid="uart_configuration__section_n5y_3zy_21c"><h2 class="- topic/title title sectiontitle">内核配置</h2>
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<div class="- topic/p p" data-ofbid="d219677e27__20250121171646">
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<ol class="- topic/ol ol" id="uart_configuration__ol_tyx_gml_sdc" data-ofbid="uart_configuration__ol_tyx_gml_sdc"><li class="- topic/li li" data-ofbid="d219677e30__20250121171646">
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<div class="- topic/div div">
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<div class="- topic/p p" data-ofbid="d219677e34__20250121171646">在 SDK 根目录下，执行下列命令，进入 kernel
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的功能配置界面：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_configuration__codeblock_wg1_3ml_sdc" data-ofbid="uart_configuration__codeblock_wg1_3ml_sdc">make kernel-menuconfig</pre></div>
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<p class="- topic/p p" data-ofbid="d219677e39__20250121171646">或使用简写命令</p>
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<div class="- topic/p p" data-ofbid="d219677e42__20250121171646">
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_configuration__codeblock_uss_hml_sdc" data-ofbid="uart_configuration__codeblock_uss_hml_sdc">make km</pre>
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</div>
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</div>
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</li><li class="- topic/li li" data-ofbid="d219677e49__20250121171646">
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<div class="- topic/p p" data-ofbid="d219677e51__20250121171646">按如下示例配置相应选项：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_configuration__codeblock_ghy_tzy_21c" data-ofbid="uart_configuration__codeblock_ghy_tzy_21c">Device Drivers
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Character devices
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Serial driver
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<*> <span class="hl-number">8250</span>/<span class="hl-number">16550</span> and compatible serial support
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<*> <span class="hl-number">8250</span>/<span class="hl-number">16550</span> support <strong class="hl-keyword">for</strong> ArtInChip serial ports
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[*] Support <span class="hl-number">8250</span>_core.* kernel options (DEPRECATED)
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[*] Support <strong class="hl-keyword">for</strong> variants of the <span class="hl-number">16550</span>A serial port
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[ ] Support <strong class="hl-keyword">for</strong> Fintek F81216A LPC to <span class="hl-number">4</span> UART RS485 API
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[*] Console on <span class="hl-number">8250</span>/<span class="hl-number">16550</span> and compatible serial port
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(<span class="hl-number">8</span>) Maximum number of <span class="hl-number">8250</span>/<span class="hl-number">16550</span> serial ports
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(<span class="hl-number">8</span>) Number of <span class="hl-number">8250</span>/<span class="hl-number">16550</span> serial ports to <strong class="hl-keyword">register</strong> at runtime
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[ ] Extended <span class="hl-number">8250</span>/<span class="hl-number">16550</span> serial driver options</pre></div>
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</li></ol>
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</div>
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</section><section class="- topic/section section" id="uart_configuration__section_p5y_3zy_21c" data-ofbid="uart_configuration__section_p5y_3zy_21c"><h2 class="- topic/title title sectiontitle">系统参数配置</h2>
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<p class="- topic/p p" data-ofbid="d219677e63__20250121171646">D211 提供最多 8 个 UART 端口。</p>
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<div class="- topic/p p" data-ofbid="d219677e66__20250121171646">这些参数主要在文件 <span class="+ topic/ph sw-d/filepath ph filepath">target/d211/common/d211.dtsi</span> 中，模块系统参数随 SoC
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的设定而定，一般不能进行更改，除非更换了新的
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SoC，则需要在专业人士的指导下进行更改。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_configuration__codeblock_g3c_5zy_21c" data-ofbid="uart_configuration__codeblock_g3c_5zy_21c">uart1: serial@<span class="hl-number">18711000</span> {
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compatible = <span class="hl-string">"artinchip,aic-uart-v1.0"</span>;
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reg = <<span class="hl-number">0x0</span> <span class="hl-number">0x18711000</span> <span class="hl-number">0x0</span> <span class="hl-number">0x400</span>>;
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interrupts-extended = <&plic0 <span class="hl-number">77</span> IRQ_TYPE_LEVEL_HIGH>;
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reg-shift = <<span class="hl-number">2</span>>;
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reg-io-width = <<span class="hl-number">4</span>>;
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clocks = <&cmu CLK_UART1>;
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clock-frequency = <<span class="hl-number">48000000</span>>;
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resets = <&rst RESET_UART1>;
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dmas = <&dma DMA_UART1>, <&dma DMA_UART1>;
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dma-names = <span class="hl-string">"rx"</span>, <span class="hl-string">"tx"</span>;
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};</pre></div>
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<ul class="- topic/ul ul" id="uart_configuration__ul_r5y_3zy_21c" data-ofbid="uart_configuration__ul_r5y_3zy_21c"><li class="- topic/li li" data-ofbid="d219677e75__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">reg-shift</span><p class="- topic/p p" data-ofbid="d219677e78__20250121171646">UART 控制器兼容 8250 标准, 寄存器寻址使用索引而不是偏移描述，reg-shift
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用来进行索引和地址的转换计算，该值不能修改</p></li><li class="- topic/li li" data-ofbid="d219677e80__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">reg-io-width</span><p class="- topic/p p" data-ofbid="d219677e83__20250121171646">为寄存器的位宽，<code class="+ topic/ph pr-d/codeph ph codeph">4</code> 表示采用 32
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位标准位宽，该值不能修改</p></li><li class="- topic/li li" data-ofbid="d219677e88__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">clock-frequency</span><p class="- topic/p p" data-ofbid="d219677e91__20250121171646">D211 UART 模块的父时钟为 48M， UART
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模块时钟的频率通过对其父时钟的进行除频来设置，clock-frequency 即用于设置 UART 的模块时钟，
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不同的模块时钟时波特率的误差可能不同，因此可以根据目标波特率进行模块时钟的设置。关于详细设置，可查看 <a class="- topic/xref xref" href="../../reused/module-clock_reused.html#topic_y4l_wwh_ryb">模块时钟</a></p></li></ul>
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</section><section class="- topic/section section" id="uart_configuration__section_v5y_3zy_21c" data-ofbid="uart_configuration__section_v5y_3zy_21c"><h2 class="- topic/title title sectiontitle">功能参数配置</h2>
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<p class="- topic/p p" data-ofbid="d219677e102__20250121171646">功能参数主要针对某一个使用方案而定，因此随着方案的不同，参数很可能不同，</p>
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<div class="- topic/p p" data-ofbid="d219677e105__20250121171646">这些参数主要在文件 <span class="+ topic/ph sw-d/filepath ph filepath">target/d211/xxx/board.dts</span>
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中，功能参数的设置必须和硬件原理图相匹配<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_configuration__codeblock_vs2_lzy_21c" data-ofbid="uart_configuration__codeblock_vs2_lzy_21c">&uart1 {
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pinctrl-names = <span class="hl-string">"default"</span>;
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pinctrl-<span class="hl-number">0</span> = <&uart1_pins_a>;
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linux,rs485-enabled-at-boot-time;
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aic,rs485-compact-io-mode;
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status = <span class="hl-string">"okay"</span>;
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};</pre></div>
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<ul class="- topic/ul ul" id="uart_configuration__ul_x5y_3zy_21c" data-ofbid="uart_configuration__ul_x5y_3zy_21c"><li class="- topic/li li" data-ofbid="d219677e114__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">pinctrl-names</span><p class="- topic/p p" data-ofbid="d219677e117__20250121171646">SDK 一般会把要使用的某一功能的端口组预先定义，后期直接使用即可，定义一般放在
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||
<span class="+ topic/ph sw-d/filepath ph filepath">target/d211/common/aicxxx-pinctrl.dtsi</span> 文件中，目前
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<span class="+ topic/keyword pr-d/parmname keyword parmname">pinctrl-names</span> 均设置为 <span class="+ topic/ph ui-d/uicontrol ph uicontrol">default</span>
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||
即可。</p></li><li class="- topic/li li" data-ofbid="d219677e128__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">pinctrl-0</span><p class="- topic/p p" data-ofbid="d219677e131__20250121171646">即指示 UART 预先定义的端口组，其中包括用于进行发送/接收选择的 GPIO
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||
端口</p></li><li class="- topic/li li" data-ofbid="d219677e133__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">linux,rs485-enabled-at-boot-time</span><p class="- topic/p p" data-ofbid="d219677e136__20250121171646">该端口配置为 RS485</p></li><li class="- topic/li li" data-ofbid="d219677e138__20250121171646"><span class="+ topic/keyword pr-d/parmname keyword parmname">aic,rs485-compact-io-mode</span><p class="- topic/p p" data-ofbid="d219677e141__20250121171646">使用 AIC 独有的精简 IO 模式， 只使用 2
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||
个端口，一个用作发送接收，一个用作发送和接收控制</p></li></ul>
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||
<p class="- topic/p p" data-ofbid="d219677e144__20250121171646">其中 rs485 功能还有其他一些可选配置项，如 time delay 等，目前 SoC 内部对此类参数做了很好的兼容，除非特殊的 rs485
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||
模组，否则均不需要额外配置参数</p>
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||
</section><section class="- topic/section section" id="uart_configuration__section_cvy_3zy_21c" data-ofbid="uart_configuration__section_cvy_3zy_21c"><h2 class="- topic/title title sectiontitle">调试端口</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d219677e152__20250121171646">调试端口的配置除了要使能相应的 UART 端口，还要在 <span class="+ topic/ph sw-d/filepath ph filepath">target/aicxxx/common/env.txt</span>
|
||
文件中配置波特率等相关参数：</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_configuration__pre_dvy_3zy_21c" data-ofbid="uart_configuration__pre_dvy_3zy_21c">earlycon=smhconsole=ttyS0,<span class="hl-number">115200</span>n8</pre>
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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="#uart_configuration__section_n5y_3zy_21c" data-tocid="uart_configuration__section_n5y_3zy_21c">内核配置</a></div></li><li class="section-item"><div class="section-title"><a href="#uart_configuration__section_p5y_3zy_21c" data-tocid="uart_configuration__section_p5y_3zy_21c">系统参数配置</a></div></li><li class="section-item"><div class="section-title"><a href="#uart_configuration__section_v5y_3zy_21c" data-tocid="uart_configuration__section_v5y_3zy_21c">功能参数配置</a></div></li><li class="section-item"><div class="section-title"><a href="#uart_configuration__section_cvy_3zy_21c" data-tocid="uart_configuration__section_cvy_3zy_21c">调试端口</a></div></li></ul></div>
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