mirror of
https://gitee.com/Vancouver2017/luban-lite-t3e-pro.git
synced 2025-12-14 18:38:55 +00:00
198 lines
16 KiB
HTML
198 lines
16 KiB
HTML
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
|
||
<head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"/><meta http-equiv="X-UA-Compatible" content="IE=edge"/><meta name="description" content="初始化流程 I2C 模块驱动的初始化流程如下： 传输流程 在 master 驱动中，数据的传输由 xfer 发起，可以完成多个 msg 的传输。传输流程如下： I2C 模块总线信号 在 I2C 总线的数据传输过程，由 start/restart/stop 作为总线的控制信号。了解 I2C 模块中 start/restart/stop 信号的生成方式，有助于了解驱动的源码实现。 master ..."/><meta name="DC.rights.owner" content="(C) 版权 2025"/><meta name="copyright" content="(C) 版权 2025"/><meta name="generator" content="DITA-OT"/><meta name="DC.type" content="concept"/><meta name="DC.creator" content="yan.wang"/><meta name="DC.date.created" content="2024-01-23"/><meta name="DC.date.modified" content="2024-12-02"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="i2c_key_procedures"/><meta name="DC.language" content="zh-CN"/><title>关键流程设计</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/i2c/i2c_key_procedure.dita"/><meta name="wh-out-relpath" content="topics/sdk/i2c/i2c_key_procedure.html"/>
|
||
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/commons.css?buildId=2023110923"/>
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/topic.css?buildId=2023110923"/>
|
||
|
||
<script src="../../../webhelp/app/options/properties.js?buildId=20250121171154"></script>
|
||
<script src="../../../webhelp/app/localization/strings.js?buildId=2023110923"></script>
|
||
<script src="../../../webhelp/app/search/index/keywords.js?buildId=20250121171154"></script>
|
||
<script defer="defer" src="../../../webhelp/app/commons.js?buildId=2023110923"></script>
|
||
<script defer="defer" src="../../../webhelp/app/topic.js?buildId=2023110923"></script>
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-styles-web.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/notes.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-common.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-images.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/footnote.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-web-watermark.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/topic-body-list.css?buildId=2023110923"/></head>
|
||
|
||
<body id="i2c_key_procedures" class="wh_topic_page frmBody">
|
||
<a href="#wh_topic_body" class="sr-only sr-only-focusable">
|
||
跳转到主要内容
|
||
</a>
|
||
|
||
|
||
|
||
|
||
<header class="navbar navbar-default wh_header">
|
||
<div class="container-fluid">
|
||
<div class="wh_header_flex_container navbar-nav navbar-expand-md navbar-dark">
|
||
<div class="wh_logo_and_publication_title_container">
|
||
<div class="wh_logo_and_publication_title">
|
||
|
||
<a href="http://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo-white.png" alt="RTOS SDK 使用指南SDK 指南文件"/></a>
|
||
<div class=" wh_publication_title "><a href="../../../index.html"><span class="booktitle"><span class="ph mainbooktitle">RTOS SDK 使用指南</span><span class="ph booktitlealt">SDK 指南文件</span></span></a></div>
|
||
|
||
</div>
|
||
|
||
|
||
</div>
|
||
|
||
<div class="wh_top_menu_and_indexterms_link collapse navbar-collapse" id="wh_top_menu_and_indexterms_link">
|
||
|
||
|
||
|
||
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</header>
|
||
|
||
|
||
|
||
|
||
<div class=" wh_search_input navbar-form wh_topic_page_search search " role="form">
|
||
|
||
|
||
|
||
<form id="searchForm" method="get" role="search" action="../../../search.html"><div><input type="search" placeholder="搜索 " class="wh_search_textfield" id="textToSearch" name="searchQuery" aria-label="搜索查询" required="required"/><button type="submit" class="wh_search_button" aria-label="搜索"><span class="search_input_text">搜索</span></button></div></form>
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<div class="container-fluid" id="wh_topic_container">
|
||
<div class="row">
|
||
|
||
<nav class="wh_tools d-print-none navbar-expand-md" aria-label="Tools">
|
||
|
||
<div data-tooltip-position="bottom" class=" wh_breadcrumb "></div>
|
||
|
||
|
||
|
||
<div class="wh_right_tools">
|
||
<button class="wh_hide_highlight" aria-label="切换搜索突出显示" title="切换搜索突出显示"></button>
|
||
<button class="webhelp_expand_collapse_sections" data-next-state="collapsed" aria-label="折叠截面" title="折叠截面"></button>
|
||
|
||
|
||
|
||
|
||
<div class=" wh_print_link print d-none d-md-inline-block "><button onClick="window.print()" title="打印此页" aria-label="打印此页"></button></div>
|
||
|
||
|
||
</div>
|
||
|
||
</nav>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div class="wh_content_area">
|
||
<div class="row">
|
||
|
||
|
||
<div class="col-lg-10 col-md-10 col-sm-10 col-xs-12" id="wh_topic_body">
|
||
|
||
<button id="wh_close_topic_toc_button" class="close-toc-button d-none" aria-label="Toggle topic table of content" aria-controls="wh_topic_toc" aria-expanded="true">
|
||
<span class="close-toc-icon-container">
|
||
<span class="close-toc-icon"></span>
|
||
</span>
|
||
</button>
|
||
|
||
<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_key_procedure.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">关键流程设计</h1><div class="date inPage">2 Dec 2024</div><div style="color: gray;">
|
||
Read time: 1 minute(s)
|
||
</div><div class="- topic/body concept/conbody body conbody"><section class="- topic/section section" id="i2c_key_procedures__section_unt_y5r_21c" data-ofbid="i2c_key_procedures__section_unt_y5r_21c"><h2 class="- topic/title title sectiontitle">初始化流程</h2><p class="- topic/p p" data-ofbid="d259694e26__20250121171720">I2C 模块驱动的初始化流程如下：</p><p class="- topic/p p" data-ofbid="d259694e28__20250121171720"></p><div class="- topic/p p" data-ofbid="d259694e29__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_rfy_y1l_g1c" src="../../../images/i2c/i2c_design_init_rtos.png" width="144" alt="i2c_design_init_rtos"/></div><br/></div></section><section class="- topic/section section" id="i2c_key_procedures__section_ul2_xvr_21c" data-ofbid="i2c_key_procedures__section_ul2_xvr_21c"><h2 class="- topic/title title sectiontitle">传输流程</h2><p class="- topic/p p" data-ofbid="d259694e36__20250121171720">在 master 驱动中，数据的传输由 xfer 发起，可以完成多个 msg 的传输。传输流程如下：</p><div class="- topic/p p" data-ofbid="d259694e38__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_xnt_y5r_21c" src="../../../images/i2c/i2c_design_xfer.png" width="192" alt="i2c_design_xfer"/></div><br/></div></section><section class="- topic/section section" id="i2c_key_procedures__section_ynt_y5r_21c" data-ofbid="i2c_key_procedures__section_ynt_y5r_21c"><h2 class="- topic/title title sectiontitle">I2C 模块总线信号</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d259694e47__20250121171720">在 I2C 总线的数据传输过程，由 start/restart/stop 作为总线的控制信号。了解 I2C 模块中 start/restart/stop
|
||
信号的生成方式，有助于了解驱动的源码实现。<ul class="- topic/ul ul" id="i2c_key_procedures__ul_ab5_4vr_21c" data-ofbid="i2c_key_procedures__ul_ab5_4vr_21c"><li class="- topic/li li" data-ofbid="d259694e50__20250121171720">master transmitter<div class="- topic/p p" data-ofbid="d259694e52__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_a4t_y5r_21c" src="../../../images/i2c/i2c_master_transmitter.png" alt="master transmitter"/></div><br/></div><p class="- topic/p p" data-ofbid="d259694e56__20250121171720">对图中 3 个关键点的解释：</p><ol class="- topic/ol ol" id="i2c_key_procedures__ol_b4t_y5r_21c" data-ofbid="i2c_key_procedures__ol_b4t_y5r_21c"><li class="- topic/li li" data-ofbid="d259694e59__20250121171720">
|
||
<p class="- topic/p p" data-ofbid="d259694e61__20250121171720">I2C 作为 transmitter 时，当向 TXFIFO 中写入数据时，I2C 模块会自动发出 start 信号</p>
|
||
</li><li class="- topic/li li" data-ofbid="d259694e64__20250121171720">
|
||
<p class="- topic/p p" data-ofbid="d259694e66__20250121171720">若 stop 位未置位，则当 TXFIFO 中的数据全部发送，TXFIFO 为空时，会保持 SCL 为低电平，直到再次向
|
||
TXFIFO 中写入数据</p>
|
||
</li><li class="- topic/li li" data-ofbid="d259694e69__20250121171720">
|
||
<p class="- topic/p p" data-ofbid="d259694e71__20250121171720">再次向 TXFIFO 写入数据时，将 stop 位置 1，则在完成该字节的发送后，master 会自动发送 stop 信号</p>
|
||
</li></ol></li><li class="- topic/li li" data-ofbid="d259694e74__20250121171720">master receiver<div class="- topic/p p" data-ofbid="d259694e76__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_d4t_y5r_21c" src="../../../images/i2c/i2c_master_receiver.png" alt="master receiver"/></div><br/></div><p class="- topic/p p" data-ofbid="d259694e80__20250121171720">对图中 3 个关键点的解释：</p><ol class="- topic/ol ol" id="i2c_key_procedures__ol_e4t_y5r_21c" data-ofbid="i2c_key_procedures__ol_e4t_y5r_21c"><li class="- topic/li li" data-ofbid="d259694e83__20250121171720">
|
||
<p class="- topic/p p" data-ofbid="d259694e85__20250121171720">I2C 作为 receiver 时，当向 TXFIFO 写入读命令(即向 I2C_DATA_CMD 写入读命令) 时，I2C
|
||
模块会自动发送 start 信号</p>
|
||
</li><li class="- topic/li li" data-ofbid="d259694e88__20250121171720">
|
||
<p class="- topic/p p" data-ofbid="d259694e90__20250121171720">当接收到 slave 端发送的数据后，只有再次发送一次读命令，才会对本次收到的数据恢复 ACK 确认信号</p>
|
||
</li><li class="- topic/li li" data-ofbid="d259694e93__20250121171720">
|
||
<p class="- topic/p p" data-ofbid="d259694e95__20250121171720">master 在接收到最后一个数据后，回复 NACK，slave 端才会结束数据的传送。在发送最后一个读命令时，同时将 stop
|
||
位置位，则 master 在接收到 slave 发送的数据后，I2C 模块会自动发送 NACK 信号</p>
|
||
</li></ol></li></ul></div>
|
||
<div class="- topic/note note note note_note" id="i2c_key_procedures__note_vyr_qvr_21c" data-ofbid="i2c_key_procedures__note_vyr_qvr_21c"><span class="note__title">注：</span>
|
||
<p class="- topic/p p" data-ofbid="d259694e101__20250121171720">I2C 模块的数据传输，无论是 transmitter 还是 receiver，都会用到 TXFIFO，transmitter 时用来发送数据，receiver
|
||
时用来发送命令。所以，中断处理中，触发 TXFIFO_EMPTY 中断的，可能是 msg，也可能是 write msg</p>
|
||
</div>
|
||
</section><section class="- topic/section section" id="i2c_key_procedures__section_c4t_y5r_21c" data-ofbid="i2c_key_procedures__section_c4t_y5r_21c"><h2 class="- topic/title title sectiontitle">中断流程</h2><div class="- topic/p p" data-ofbid="d259694e108__20250121171720"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="i2c_key_procedures__image_f4t_y5r_21c" src="../../../images/i2c/i2c_design_interrupt.png" width="384" alt="i2c_design_interrupt"/></div><br/></div></section></div></article></main></div>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
</div>
|
||
|
||
<nav role="navigation" id="wh_topic_toc" aria-label="On this page" class="col-lg-2 d-none d-lg-block navbar d-print-none">
|
||
<div id="wh_topic_toc_content">
|
||
|
||
<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_key_procedures__section_unt_y5r_21c" data-tocid="i2c_key_procedures__section_unt_y5r_21c">初始化流程</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_key_procedures__section_ul2_xvr_21c" data-tocid="i2c_key_procedures__section_ul2_xvr_21c">传输流程</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_key_procedures__section_ynt_y5r_21c" data-tocid="i2c_key_procedures__section_ynt_y5r_21c">I2C 模块总线信号</a></div></li><li class="section-item"><div class="section-title"><a href="#i2c_key_procedures__section_c4t_y5r_21c" data-tocid="i2c_key_procedures__section_c4t_y5r_21c">中断流程</a></div></li></ul></div>
|
||
|
||
</div>
|
||
</nav>
|
||
|
||
</div>
|
||
</div>
|
||
|
||
|
||
|
||
</div>
|
||
<footer class="navbar navbar-default wh_footer">
|
||
<div class=" footer-container mx-auto ">
|
||
<title>footer def</title>
|
||
<style><!--
|
||
|
||
.p1 {
|
||
font-family: FangZhengShuSong, Times, serif;
|
||
}
|
||
.p2 {
|
||
font-family: Arial, Helvetica, sans-serif;
|
||
}
|
||
.p3 {
|
||
font-family: "Lucida Console", "Courier New", monospace;
|
||
}
|
||
|
||
--></style>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<div class="webhelp.fragment.footer">
|
||
<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
|
||
</div><div>
|
||
<div class="generation_time">
|
||
Update Time: 2025-01-21
|
||
</div>
|
||
</div>
|
||
</div>
|
||
</footer>
|
||
|
||
<div id="go2top" class="d-print-none">
|
||
<span class="oxy-icon oxy-icon-up"></span>
|
||
</div>
|
||
|
||
<div id="modal_img_large" class="modal">
|
||
<span class="close oxy-icon oxy-icon-remove"></span>
|
||
<div id="modal_img_container"></div>
|
||
<div id="caption"></div>
|
||
</div>
|
||
|
||
|
||
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
|
||
|
||
|
||
</body>
|
||
</html> |