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data-tocid="uart_user_guide-d5856e5879" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d5856e5879-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide_2.html" id="uart_user_guide-d5856e5879-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d5856e5951" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d5856e5951-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide_2.html" id="usb_user_guide-d5856e5951-link">USB 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d5856e6011" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e6011-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/mac/mac_user_guide_2.html" id="id-d5856e6011-link">MAC 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d5856e6083" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d5856e6083-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d5856e6083-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">I2C 使用指南</h1><div class="date inPage">15 Jan 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"><div class="- topic/p p" data-ofbid="d222966e24__20250121171648">
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<div class="- topic/div div">
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<p class="- topic/p p" data-ofbid="d222966e28__20250121171648">I2C 模块是一种用于连接 CPU 主机与 I<sup class="+ topic/ph hi-d/sup ph sup">2</sup>C 总线之间的接口，包括一根串行数据线 (SDA) 和一根串行时钟线
|
||
(SCL)，分别用于传输数据和时钟信号，是实现 I2C 通信的基础。在 I<sup class="+ topic/ph hi-d/sup ph sup">2</sup>C 总线上，每个设备都有一个唯一的地址。当主设备 (master)
|
||
希望与从设备 (slave) 通信时，会通过发送从设备 (slave)
|
||
的地址来建立连接。这种寻址方式允许在同一总线上连接多个设备，并进行精确的数据传输。主设备负责发起数据传输并生成时钟信号，而被主设备寻址的设备则作为从设备进行响应。这种主从关系确保了通信的有序性和有效性。此外，I2C
|
||
支持多种传输模式，以满足不同的应用需求。</p>
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</div>
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<div class="table-container"><table class="- topic/table table frame-all" id="i2c_user_guide__table_w3g_mtr_21c" data-ofbid="i2c_user_guide__table_w3g_mtr_21c" data-cols="3"><caption class="- topic/title title tablecap" data-caption-side="top" data-is-repeated="true"><span class="table--title-label">表<span class="table--title-label-number"> 1</span><span class="table--title-label-punctuation">. </span></span><span class="table--title">术语定义</span></caption><colgroup><col style="width:28.732394366197184%"/><col style="width:28.169014084507044%"/><col style="width:43.098591549295776%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="i2c_user_guide__table_w3g_mtr_21c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="i2c_user_guide__table_w3g_mtr_21c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="i2c_user_guide__table_w3g_mtr_21c__entry__3">注释说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">SDA</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 数据线</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">-</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">SCL</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 时钟线</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">-</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">I2C algorithm</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 通信方法</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">提供产生 I2C 总线访问的通信函数</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">I2C adapter</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 适配器</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">对 I2C 控制器的软件抽象</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2c_user_guide__table_w3g_mtr_21c__entry__1">I2C client</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2c_user_guide__table_w3g_mtr_21c__entry__2">I2C 用户端</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="i2c_user_guide__table_w3g_mtr_21c__entry__3">一个 client 对应一个 I2C device</td></tr></tbody></table></div>
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</div><section class="- topic/section section" id="i2c_user_guide__section_mb5_trn_4dc" data-ofbid="i2c_user_guide__section_mb5_trn_4dc"><h2 class="- topic/title title sectiontitle">模块特性</h2>
|
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<div class="- topic/p p" data-ofbid="d222966e95__20250121171648">
|
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<ul class="- topic/ul ul" id="i2c_user_guide__ul_rcv_ktr_21c" data-ofbid="i2c_user_guide__ul_rcv_ktr_21c"><li class="- topic/li li" data-ofbid="d222966e98__20250121171648">
|
||
<p class="- topic/p p" data-ofbid="d222966e100__20250121171648">支持主和从模式</p>
|
||
</li><li class="- topic/li li" data-ofbid="d222966e103__20250121171648">
|
||
<p class="- topic/p p" data-ofbid="d222966e105__20250121171648">支持最高 400Kb/s 传输</p>
|
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</li><li class="- topic/li li" data-ofbid="d222966e108__20250121171648">
|
||
<p class="- topic/p p" data-ofbid="d222966e110__20250121171648">支持 7 bits 和 10 bits 寻址</p>
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</li><li class="- topic/li li" data-ofbid="d222966e113__20250121171648">
|
||
<p class="- topic/p p" data-ofbid="d222966e115__20250121171648">支持时钟同步</p>
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</li><li class="- topic/li li" data-ofbid="d222966e118__20250121171648">
|
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<p class="- topic/p p" data-ofbid="d222966e120__20250121171648">支持中断和轮询模式</p>
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</li><li class="- topic/li li" data-ofbid="d222966e123__20250121171648">
|
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<p class="- topic/p p" data-ofbid="d222966e125__20250121171648">可编程 SDA 保持时间</p>
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</li><li class="- topic/li li" data-ofbid="d222966e128__20250121171648">
|
||
<p class="- topic/p p" data-ofbid="d222966e130__20250121171648">可编程防止 I<sup class="+ topic/ph hi-d/sup ph sup">2</sup>C 通信异常总线挂死</p>
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