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data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d5856e5648-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_user_guide_2.html" id="id-d5856e5648-link">PWM 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="rtp-user-guide-d5856e5721" class="topicref" data-id="rtp-user-guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action rtp-user-guide-d5856e5721-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtp/rtp_user_guide_2.html" id="rtp-user-guide-d5856e5721-link">RTP 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="spi-d5856e5805" class="topicref" data-id="spi" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action spi-d5856e5805-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/spi/spi_user_guide_2.html" id="spi-d5856e5805-link"><span class="ph">Q</span>SPI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div 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 topic" 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_design_lite.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">设计说明</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 body"><section class="- topic/section section" id="id__section_qhx_gpf_fdc" data-ofbid="id__section_qhx_gpf_fdc"><h2 class="- topic/title title sectiontitle">源码说明</h2>
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<div class="- topic/p p" data-ofbid="d299015e24__20250121171803">源代码位于 <span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/</span>：<ul class="- topic/ul ul simple" id="id__ul_jv4_wf3_fdc" data-ofbid="id__ul_jv4_wf3_fdc"><li class="- topic/li li" data-ofbid="d299015e30__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e32__20250121171803"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/drv/i2c/drv_i2c.c</span>，I2C Driver 层实现</p>
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</li><li class="- topic/li li" data-ofbid="d299015e37__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e39__20250121171803"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/hal/i2c/hal_i2c.c</span>，I2C HAL 层实现</p>
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</li><li class="- topic/li li" data-ofbid="d299015e44__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e46__20250121171803"><span class="+ topic/ph sw-d/filepath ph filepath">bsp/artinchip/include/hal/hal_i2c.h</span>，I2C HAL
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层接口头文件</p>
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</li></ul></div>
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</section><section class="- topic/section section" id="id__section_olt_xf3_fdc" data-ofbid="id__section_olt_xf3_fdc"><h2 class="- topic/title title sectiontitle">模块架构</h2>
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<div class="- topic/div div section" id="id__id3">
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<p class="- topic/p p" data-ofbid="d299015e59__20250121171803">I2C 驱动 Driver 层采用 RT-Thread 的 I2C 设备驱动框架，APP 可以遵从 RT-Thread 的调用方式，也可以直接使用 HAL
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层，支持 Baremetal 方式的应用场景。</p>
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<figure class="- topic/fig fig fignone" id="id__fig_xjr_wf3_fdc" data-ofbid="id__fig_xjr_wf3_fdc"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="id__image_yjr_wf3_fdc" src="../../../images/i2c/i2c_structure.png" width="240" alt="i2c_structure"/></div><br/></figure>
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<div class="- topic/div div section" id="id__i2c-master">
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<strong class="+ topic/ph hi-d/b ph b">I2C master</strong>
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<p class="- topic/p p" data-ofbid="d299015e72__20250121171803">I2C 作为 master 时，驱动的实现主要包括四个部分：</p><ol class="- topic/ol ol arabic simple" id="id__ol_zjr_wf3_fdc" data-ofbid="id__ol_zjr_wf3_fdc"><li class="- topic/li li" data-ofbid="d299015e75__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e77__20250121171803">硬件参数配置：主要是设置 I2C 工作的主机模式，7bit 或 10bit 寻址，寻址的从机地址设置，FIFO
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||
设置以及总线传输速率等。</p>
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</li><li class="- topic/li li" data-ofbid="d299015e80__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e82__20250121171803">SCL 时序参数设置：根据设置的总线传输速率，设置 SCL 的高低电平时间。</p>
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</li><li class="- topic/li li" data-ofbid="d299015e85__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e87__20250121171803">i2c_algorithm 的实现：作为主机端，主要是 master_xfer 的实现。在驱动实现中，以 message
|
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为单位进行数据的收发，数据的传输采用中断的方式。</p>
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</li><li class="- topic/li li" data-ofbid="d299015e90__20250121171803">
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<p class="- topic/p p" data-ofbid="d299015e92__20250121171803">中断的处理：处理 master 端的数据收发，并产生相应的 start、ack、nack、restart、stop 信号。</p>
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</li></ol></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="#id__section_qhx_gpf_fdc" data-tocid="id__section_qhx_gpf_fdc">源码说明</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_olt_xf3_fdc" data-tocid="id__section_olt_xf3_fdc">模块架构</a></div></li></ul></div>
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