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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_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">17 Dec 2024</div><div style="color: gray;">
Read time: 2 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d49787e22__20250121171518">调试流程如下：<ol class="- topic/ol ol" id="uart_debug_guide__ol_qb2_21z_21c" data-ofbid="uart_debug_guide__ol_qb2_21z_21c"><li class="- topic/li li" data-ofbid="d49787e25__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e27__20250121171518">使用以下任意一种方式将 log 等级设置为最高 8：</p>
<ul class="- topic/ul ul" id="uart_debug_guide__ul_ypy_wzy_21c" data-ofbid="uart_debug_guide__ul_ypy_wzy_21c"><li class="- topic/li li" data-ofbid="d49787e31__20250121171518">在 <span class="+ topic/ph sw-d/filepath ph filepath">target/aicxxx/common/env.txt</span> 文件中，将 bootarg 设置
loglevel=8</li><li class="- topic/li li" data-ofbid="d49787e36__20250121171518">
<div class="- topic/p p" data-ofbid="d49787e38__20250121171518">在 SDK 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make kernel-menuconfig</span> 或者
<span class="+ topic/keyword sw-d/cmdname keyword cmdname">make km</span> 命令打开内核配置，并设置对应的 log
等级：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_zw4_f1z_21c" data-ofbid="uart_debug_guide__codeblock_zw4_f1z_21c">Kernel hacking
printk and dmesg options
(<span class="hl-number">8</span>) Default console loglevel (<span class="hl-number">1</span>-<span class="hl-number">15</span>)
(<span class="hl-number">7</span>) Default message log level (<span class="hl-number">1</span>-<span class="hl-number">7</span>)</pre></div>
</li></ul>
</li><li class="- topic/li li" data-ofbid="d49787e50__20250121171518">
<div class="- topic/p p" data-ofbid="d49787e52__20250121171518">在 SDK 根目录下执行 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make kernel-menuconfig</span> 或者 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make
km</span> 命令打开内核配置，按如下路径，打开 UART
的调试开关：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_e2n_g1z_21c" data-ofbid="uart_debug_guide__codeblock_e2n_g1z_21c">Kernel hacking
[*] Kernel debuging
ArtInChip Debug
[*] UART Driver Debug</pre></div>
</li></ol></div><section class="- topic/section section" id="uart_debug_guide__section_eqy_wzy_21c" data-ofbid="uart_debug_guide__section_eqy_wzy_21c"><h2 class="- topic/title title sectiontitle">调试端口</h2>
<p class="- topic/p p" data-ofbid="d49787e68__20250121171518">如果 UART 作为调试端口，其主要工作即为进行调试日志的输入输出，模块工作正常则可以正常进行日志的输入输出，调试端口是所有其他模块的调试的基础，以 uart0
作为调试端口为例</p>
<div class="- topic/p p" data-ofbid="d49787e71__20250121171518">调试端口在驱动中强制不使用 DMA。<ol class="- topic/ol ol" id="uart_debug_guide__ol_cnh_j1z_21c" data-ofbid="uart_debug_guide__ol_cnh_j1z_21c"><li class="- topic/li li" data-ofbid="d49787e74__20250121171518">端口配置：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_bht_j1z_21c" data-ofbid="uart_debug_guide__codeblock_bht_j1z_21c">target/d211/方案 x/board.dts
&amp;uart0 {
pinctrl-names = <span class="hl-string">"default"</span>;
pinctrl-<span class="hl-number">0</span> = &lt;&amp;uart0_pins_a&gt;;
status = <span class="hl-string">"okay"</span>;
};</pre></li><li class="- topic/li li" data-ofbid="d49787e78__20250121171518">调试端口指定<p class="- topic/p p" data-ofbid="d49787e80__20250121171518">调试端口的配置只在 <span class="+ topic/ph sw-d/filepath ph filepath">env.txt</span>
中指定即可，<span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中 bootargs 中的 console 只是在 JTAG
调试时使用</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_rpf_k1z_21c" data-ofbid="uart_debug_guide__codeblock_rpf_k1z_21c">target/d211/common/env.txt
earlycon=smh
console=ttyS0,<span class="hl-number">115200</span>n8
loglevel=<span class="hl-number">8</span></pre></li></ol></div>
</section><section class="- topic/section section" id="uart_debug_guide__section_gqy_wzy_21c" data-ofbid="uart_debug_guide__section_gqy_wzy_21c"><h2 class="- topic/title title sectiontitle">功能验证</h2>
<ol class="- topic/ol ol" id="uart_debug_guide__ol_cyt_l1z_21c" data-ofbid="uart_debug_guide__ol_cyt_l1z_21c"><li class="- topic/li li" data-ofbid="d49787e97__20250121171518">驱动加载<p class="- topic/p p" data-ofbid="d49787e99__20250121171518">uboot 和 kernel 不共享驱动，因此驱动加载是否成功也要分两个阶段验证。</p><div class="- topic/p p" data-ofbid="d49787e101__20250121171518">UART
作为调试串口和非调试串口使用的驱动一致，因此系统有任何日志输出则说明驱动加载正常。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_szy_m1z_21c" data-ofbid="uart_debug_guide__codeblock_szy_m1z_21c">Serial: <span class="hl-number">8250</span>/<span class="hl-number">16550</span> driver, <span class="hl-number">8</span> ports, IRQ sharing disabled
<span class="hl-number">18713000.</span>serial: ttyS3 at MMIO <span class="hl-number">0x18713000</span> (irq = <span class="hl-number">22</span>, base_baud = <span class="hl-number">75000000</span>) is a <span class="hl-number">16550</span>A
aic8250_apply_quirks port:<span class="hl-number">0</span> rs485:<span class="hl-number">0</span>
aic8250_probe port:<span class="hl-number">0</span> clk:<span class="hl-number">48000000</span> regshift:<span class="hl-number">2</span>
aic8250_probe success.</pre></div></li><li class="- topic/li li" data-ofbid="d49787e105__20250121171518">设备信息<p class="- topic/p p" data-ofbid="d49787e107__20250121171518">系统默认会给每一个 UART 端口创建一个设备节点，即 ttyS#，而不管设备是否被打开。</p><div class="- topic/p p" data-ofbid="d49787e109__20250121171518">从
<span class="+ topic/ph sw-d/filepath ph filepath">/sys/class/tty/ttyS#</span> 中查看该设备信息可以确认其是否被正常初始化：<ol class="- topic/ol ol" type="a" id="uart_debug_guide__ol_gq1_f2s_sdc" data-ofbid="uart_debug_guide__ol_gq1_f2s_sdc"><li class="- topic/li li" data-ofbid="d49787e115__20250121171518">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__pre_lqy_wzy_21c" data-ofbid="uart_debug_guide__pre_lqy_wzy_21c">cd /sys/class/tty/ttyS1</pre>
</li><li class="- topic/li li" data-ofbid="d49787e120__20250121171518">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_fry_d2s_sdc" data-ofbid="uart_debug_guide__codeblock_fry_d2s_sdc">cat type</pre>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_d1h_22s_sdc" data-ofbid="uart_debug_guide__codeblock_d1h_22s_sdc"><span class="hl-number">0</span>： 没有初始。<span class="hl-number">4</span>： 初始化为 <span class="hl-number">16550</span>A 设备</pre>
</li><li class="- topic/li li" data-ofbid="d49787e128__20250121171518">
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_imm_22s_sdc" data-ofbid="uart_debug_guide__codeblock_imm_22s_sdc">cat console</pre>
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_gxt_22s_sdc" data-ofbid="uart_debug_guide__codeblock_gxt_22s_sdc">
N：非调试串口。Y：调试串口
</pre>
</li></ol></div></li><li class="- topic/li li" data-ofbid="d49787e136__20250121171518">设备通信<div class="- topic/p p" data-ofbid="d49787e138__20250121171518">验证模块是否可以正常通信，最简单的办法是环路端口的 RX/TX，使用 AIC 提供的 UART 测试工具进行测试<ol class="- topic/ol ol" type="a" id="uart_debug_guide__ol_s3y_41z_21c" data-ofbid="uart_debug_guide__ol_s3y_41z_21c"><li class="- topic/li li" data-ofbid="d49787e141__20250121171518">编译测试工具<div class="- topic/p p" data-ofbid="d49787e143__20250121171518">在根目录下通过 <span class="+ topic/keyword sw-d/cmdname keyword cmdname">make menuconfig</span> 可以选择编译 AIC 提供的
UART
测试工具到系统：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_jx4_p1z_21c" data-ofbid="uart_debug_guide__codeblock_jx4_p1z_21c">ArtInChip packages
Sample code
[*] test-uart</pre></div></li><li class="- topic/li li" data-ofbid="d49787e150__20250121171518">端口环路测试<div class="- topic/p p" data-ofbid="d49787e152__20250121171518">运行下列进行环路测试，但不使用其测试调试端口：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_z53_q1z_21c" data-ofbid="uart_debug_guide__codeblock_z53_q1z_21c">test_uart -C /dev/ttyS1 <span class="hl-number">9600</span></pre><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="uart_debug_guide__codeblock_qyh_g2s_sdc" data-ofbid="uart_debug_guide__codeblock_qyh_g2s_sdc">Test Mode: <span class="hl-number">3</span>:Circle
Send Device : /dev/ttyS1
Receive Device : /dev/ttyS1
m_Baudrate : <span class="hl-number">9600</span>
send data is: <span class="hl-number">1234567890</span>artinchip0987654321
receive data is: <span class="hl-number">1234567890</span>artinchip0987654321</pre></div></li></ol></div></li></ol>
</section><section class="- topic/section section" id="uart_debug_guide__section_nbb_yzy_21c" data-ofbid="uart_debug_guide__section_nbb_yzy_21c"><h2 class="- topic/title title sectiontitle">问题排查流程</h2>
<div class="- topic/p p" data-ofbid="d49787e164__20250121171518">
<ol class="- topic/ol ol" id="uart_debug_guide__ul_rqy_wzy_21c" data-ofbid="uart_debug_guide__ul_rqy_wzy_21c"><li class="- topic/li li" data-ofbid="d49787e167__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e169__20250121171518">在 <span class="+ topic/ph sw-d/filepath ph filepath">board.dts</span> 中确认使用的 UART 端口 status = “okay”</p>
</li><li class="- topic/li li" data-ofbid="d49787e175__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e177__20250121171518">确认该 UART 端口的 GPIO 端口配置正确， 具体查看相关 GPIO 端口的寄存器</p>
</li><li class="- topic/li li" data-ofbid="d49787e180__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e182__20250121171518">确认该 UART 端口的 clk 设置正确</p>
<ul class="- topic/ul ul" id="uart_debug_guide__ul_tqy_wzy_21c" data-ofbid="uart_debug_guide__ul_tqy_wzy_21c"><li class="- topic/li li" data-ofbid="d49787e186__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e188__20250121171518">确认 /dev/ttyS#/uartclk 值: 48000000</p>
</li><li class="- topic/li li" data-ofbid="d49787e191__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e193__20250121171518">在 CMU 的寄存器中查看相关寄存器，如：0x0844 CLK_UART1</p>
</li><li class="- topic/li li" data-ofbid="d49787e196__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e198__20250121171518">reg-dump -a 0x18020844： 0x18020844: 00003118</p>
</li><li class="- topic/li li" data-ofbid="d49787e201__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e203__20250121171518">clk = 1200M / (0x18 + 1) = 48M</p>
</li></ul>
</li><li class="- topic/li li" data-ofbid="d49787e207__20250121171518">
<p class="- topic/p p" data-ofbid="d49787e209__20250121171518">UART 寄存器是时分复用寄存器，直接读取的值无法明确意义，要跟踪寄存器设置，只能在代码中打印寄存器值</p>
</li></ol>
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