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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_test.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">测试指南</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
Read time: 2 minute(s)
</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="i2c_test_guide__section_dq5_ksn_4dc" data-ofbid="i2c_test_guide__section_dq5_ksn_4dc"><h2 class="- topic/title title sectiontitle">测试环境</h2>
<div class="- topic/p p" data-ofbid="d51230e27__20250121171518">
<ul class="- topic/ul ul" id="i2c_test_guide__ul_qhd_f5r_21c" data-ofbid="i2c_test_guide__ul_qhd_f5r_21c"><li class="- topic/li li" data-ofbid="d51230e30__20250121171518"><strong class="+ topic/ph hi-d/b ph b">硬件</strong><ul class="- topic/ul ul" id="i2c_test_guide__ul_e3z_d5r_21c" data-ofbid="i2c_test_guide__ul_e3z_d5r_21c"><li class="- topic/li li" data-ofbid="d51230e34__20250121171518">
<p class="- topic/p p" data-ofbid="d51230e36__20250121171518">测试板：带有两个 C 接口的测试板</p>
</li><li class="- topic/li li" data-ofbid="d51230e39__20250121171518">
<p class="- topic/p p" data-ofbid="d51230e41__20250121171518">PC：用于和测试板交互</p>
</li><li class="- topic/li li" data-ofbid="d51230e44__20250121171518">
<p class="- topic/p p" data-ofbid="d51230e46__20250121171518">串口线：连接测试板的调试串口</p>
</li></ul></li><li class="- topic/li li" data-ofbid="d51230e49__20250121171518"><strong class="+ topic/ph hi-d/b ph b">软件</strong><ul class="- topic/ul ul" id="i2c_test_guide__ul_g3z_d5r_21c" data-ofbid="i2c_test_guide__ul_g3z_d5r_21c"><li class="- topic/li li" data-ofbid="d51230e53__20250121171518">
<p class="- topic/p p" data-ofbid="d51230e55__20250121171518">PC 端串口终端软件</p>
</li><li class="- topic/li li" data-ofbid="d51230e58__20250121171518">
<p class="- topic/p p" data-ofbid="d51230e60__20250121171518">i2c-tools 第三方软件包</p>
</li></ul></li></ul>
</div>
</section><section class="- topic/section section" id="i2c_test_guide__section_h3z_d5r_21c" data-ofbid="i2c_test_guide__section_h3z_d5r_21c"><h2 class="- topic/title title sectiontitle">测试配置</h2>
<p class="- topic/p p" data-ofbid="d51230e70__20250121171518">将测试板的两个 C，一个配置为 master，一个配置为 slave。两个 C 接口对接。 编译第三方测试工具 tools，利用 tools 提供的工具进行测试。</p>
<div class="- topic/p p" data-ofbid="d51230e73__20250121171518">i2c-tools 测试：<ol class="- topic/ol ol" id="i2c_test_guide__ol_xgx_l5r_21c" data-ofbid="i2c_test_guide__ol_xgx_l5r_21c"><li class="- topic/li li" data-ofbid="d51230e76__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cdetect</strong><p class="- topic/p p" data-ofbid="d51230e79__20250121171518">i2cdetect 用于测试系统中有哪些 C 总线，以及 C
总线上有哪些地址被使用</p><p class="- topic/p p" data-ofbid="d51230e81__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cdetect -l</strong> ：列出系统中所有的 C 总线</p><div class="- topic/p p" data-ofbid="d51230e85__20250121171518">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_j3z_d5r_21c" src="../../../images/i2c/i2c_detect_1.png" alt="i2cdetect_1"/></div><br/>
</div><p class="- topic/p p" data-ofbid="d51230e91__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cdetect -y -r 0</strong> ：查询 C-0 总线上哪些地址有挂接 I2C 设备。如下如所示，0x51 地址上有挂接
C 设备</p><div class="- topic/p p" data-ofbid="d51230e95__20250121171518">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_k3z_d5r_21c" src="../../../images/i2c/i2c_detect_2.png" alt="i2cdetect_2"/></div><br/>
</div></li><li class="- topic/li li" data-ofbid="d51230e101__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cset</strong><p class="- topic/p p" data-ofbid="d51230e104__20250121171518">i2cset 用于每次向 C 设备写一个字节的数据</p><p class="- topic/p p" data-ofbid="d51230e106__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cset -f -y 0 0x54 1
0x39</strong> ：I2C 从设备地址为 0x54，将从设备中地址 1 处的数据设置为 0x39</p><div class="- topic/p p" data-ofbid="d51230e110__20250121171518">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_m3z_d5r_21c" src="../../../images/i2c/i2c_set.png" alt="i2cset"/></div><br/>
</div></li><li class="- topic/li li" data-ofbid="d51230e116__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cget</strong><p class="- topic/p p" data-ofbid="d51230e119__20250121171518">i2cget 用于每次从 C 设备读取一个字节的数据</p><p class="- topic/p p" data-ofbid="d51230e121__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2cget -f -y 0 0x54
1</strong> ：I2C 从设备地址为 0x54，读取从设备数据地址为 1 处的 1 字节数据</p><div class="- topic/p p" data-ofbid="d51230e125__20250121171518">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_o3z_d5r_21c" src="../../../images/i2c/i2c_get.png" alt="i2cget"/></div><br/>
</div></li><li class="- topic/li li" data-ofbid="d51230e131__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2ctransfer</strong><p class="- topic/p p" data-ofbid="d51230e134__20250121171518">i2ctransfer 用于与 C
设备之间传输数据，每次可读写多个数据</p><p class="- topic/p p" data-ofbid="d51230e136__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2ctransfer -f -y 0 w17@0x54 0 0x5a-</strong>
：I2C 设备地址为 0x54，向从设备写入 16byte 数据，0 为将要写入数据的起始地址，写入的数据为
0x5a，0x59，0x58…</p><div class="- topic/p p" data-ofbid="d51230e140__20250121171518">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_q3z_d5r_21c" src="../../../images/i2c/i2c_transfer_1.png" alt="i2ctransfer_1"/></div><br/>
</div><p class="- topic/p p" data-ofbid="d51230e146__20250121171518"><strong class="+ topic/ph hi-d/b ph b">i2ctransfer -f -y 0 w1@0x54 0 r16</strong> ：I2C 设备地址为 0x54，从 C 设备读取
16byte 数据，读数据的起始地址为 0</p><div class="- topic/p p" data-ofbid="d51230e150__20250121171518">
<br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_test_guide__image_r3z_d5r_21c" src="../../../images/i2c/i2c_transfer_2.png" alt="i2ctransfer_2"/></div><br/>
</div></li><li class="- topic/li li" data-ofbid="d51230e156__20250121171518"><strong class="+ topic/ph hi-d/b ph b">eeprog</strong><p class="- topic/p p" data-ofbid="d51230e159__20250121171518">eeprog 是读写 eeprom 的工具，每次读写的 message 只有一个字节。若要读写 8 个字节，则会分成 8
个 message 进行读写</p><p class="- topic/p p" data-ofbid="d51230e161__20250121171518"><strong class="+ topic/ph hi-d/b ph b">eeprog -f /dev/i2c-0 0x51 -r 0:8 -16</strong> ：I2C
设备地址为 0x51，读取的数据起始地址是 0，读取 8byte 数据，-16 表示 C 设备的数据地址需要 16bit
表示</p><p class="- topic/p p" data-ofbid="d51230e165__20250121171518"><strong class="+ topic/ph hi-d/b ph b">date | eeprog /dev/i2c-0 0x51 -w 0x200 -16</strong> ：将 date
命令返回的数据写入到 eeprom 中，写入的起始地址是 0x200</p><div class="- topic/note note note note_note" id="i2c_test_guide__note_rnz_w5r_21c" data-ofbid="i2c_test_guide__note_rnz_w5r_21c"><span class="note__title">注：</span>
<p class="- topic/p p" data-ofbid="d51230e171__20250121171518">i2c-tools 默认是不支持 eeprog 的编译的，并且使用 eeprog 时需要确保被操作的 eeprom 没有通过 DTS
挂载到 I2C 总线，否则会一直返回该 eeprom 处于 busy 状态。</p>
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