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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/i2c/i2c_debug.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">调试指南</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
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Read time: 1 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="i2c_debug_guide__section_jvt_15r_21c" data-ofbid="i2c_debug_guide__section_jvt_15r_21c"><h2 class="- topic/title title sectiontitle">I2C 通信调试</h2>
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<p class="- topic/p p" data-ofbid="d179052e27__20250121171624">在使能 C 的驱动后，可以通过 tools 中的 i2cdetect 工具，快速检测 C 通信功能是否正常。使能驱动后，会创建出相应的 C 适配器，但是 C
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通信功能是否正常仍是不确定的，可通过如下命令进行测试：</p>
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<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_debug_guide__codeblock_kvt_15r_21c" data-ofbid="i2c_debug_guide__codeblock_kvt_15r_21c">i2cdetect -y -r <span class="hl-number">0</span></pre>
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<p class="- topic/p p" data-ofbid="d179052e33__20250121171624">此命令用来测试 C 总线 0 上的地址分布情况。如果通信正常，即使总线上没有挂接任何 C 设备，那么也会立即返回结果。如果在该测试中返回 timeout，那么需要先检查
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C 的 SDA 和 SCL 是否有上拉(该问题一般是由于没有上拉导致)。如果有上拉，那么需要进一步进行调试。</p>
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</section><section class="- topic/section section" id="i2c_debug_guide__section_lvt_15r_21c" data-ofbid="i2c_debug_guide__section_lvt_15r_21c"><h2 class="- topic/title title sectiontitle">调试开关</h2>
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<div class="- topic/p p" data-ofbid="d179052e41__20250121171624">I2C 的驱动由一些 dbg 的调试信息，默认情况下是不会打印的，当需要进行跟踪调试时，可通过以下步骤打开这些调试信息。<ol class="- topic/ol ol" id="i2c_debug_guide__ol_hdx_b5r_21c" data-ofbid="i2c_debug_guide__ol_hdx_b5r_21c"><li class="- topic/li li" data-ofbid="d179052e44__20250121171624">调整 log 等级<p class="- topic/p p" data-ofbid="d179052e46__20250121171624">通过 menuconfig 调整内核的 log
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等级</p><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_debug_guide__codeblock_nvt_15r_21c" data-ofbid="i2c_debug_guide__codeblock_nvt_15r_21c">Kernel hacking--->
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printk and dmesg options--->
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(<span class="hl-number">8</span>) Default console loglevel (<span class="hl-number">1</span>-<span class="hl-number">15</span>)
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</pre></li><li class="- topic/li li" data-ofbid="d179052e50__20250121171624">打开调试开关<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="i2c_debug_guide__codeblock_ovt_15r_21c" data-ofbid="i2c_debug_guide__codeblock_ovt_15r_21c">Kernel hacking--->
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ArtInChip Debug--->
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[*] I2C driver debug
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</pre></li></ol></div>
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</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="#i2c_debug_guide__section_jvt_15r_21c" data-tocid="i2c_debug_guide__section_jvt_15r_21c">I2C 通信调试</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_debug_guide__section_lvt_15r_21c" data-tocid="i2c_debug_guide__section_lvt_15r_21c">调试开关</a></div></li></ul></div>
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