mirror of
https://gitee.com/Vancouver2017/luban-lite.git
synced 2025-12-16 09:08:56 +00:00
257 lines
35 KiB
HTML
257 lines
35 KiB
HTML
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.1">
|
||
<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="每个 PWM 控制器的两路输出信号有什么关系？ 每个控制器可以控制两路输出 PWM 信号，这两路信号从设计上有三个约束条件： 共用同一个 time-base 信号 ， 即共用一路输入时钟信号，也共用了一个计数器 共用同一个 PWM 信号频率 配置参数。 共用同一个 占空比 配置参数。 上述 “PWM 信号频率” 和 “占空比” 由 PWM 的 调用者运行时配置 。 ..."/><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="topic"/><meta name="DC.relation" content="../../../topics/sdk/pwm/pwm_user_guide.html"/><meta name="DC.relation" content="../../../topics/sdk/pwm/pwm_design_lite.html"/><meta name="DC.relation" content="../../../topics/sdk/rtp/rtp_user_guide.html"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2025-05-16"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="id"/><meta name="DC.language" content="zh-CN"/><title>常见问题</title><!-- Generated with build number 2025051600. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content="id-d3752e6362"/><meta name="wh-source-relpath" content="topics/sdk/pwm/pwm_faq.dita"/><meta name="wh-out-relpath" content="topics/sdk/pwm/pwm_faq.html"/>
|
||
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/commons.css?buildId=2024041900"/>
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/topic.css?buildId=2024041900"/>
|
||
|
||
<script src="../../../webhelp/app/options/properties.js?buildId=20250519091401"></script>
|
||
<script src="../../../webhelp/app/localization/strings.js?buildId=2024041900"></script>
|
||
<script src="../../../webhelp/app/search/index/keywords.js?buildId=20250519091401"></script>
|
||
<script defer="defer" src="../../../webhelp/app/commons.js?buildId=2024041900"></script>
|
||
<script defer="defer" src="../../../webhelp/app/topic.js?buildId=2024041900"></script>
|
||
<link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/aic-styles-web-internal.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/notes.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/aic-common.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/aic-images.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/footnote.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/aic-highlight-changes.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/search-in-header.css?buildId=2024041900"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/css/topic-body-list.css?buildId=2024041900"/></head>
|
||
|
||
<body id="id" 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 xmlns:whc="http://www.oxygenxml.com/webhelp/components" 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="https://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo.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 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>
|
||
</div>
|
||
</header>
|
||
|
||
|
||
|
||
|
||
|
||
|
||
<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 "><ol class="d-print-none"><li><span class="home"><a href="../../../index.html"><span>主页</span></a></span></li><li><div class="topicref" data-id="id"><div class="title"><a href="../../../topics/sdk/chapter-advanced-app.html">高级应用</a><div class="wh-tooltip"><p class="shortdesc">系统、存储、多媒体、接口、安全等模块的详细配置和设计说明。</p></div></div></div></li><li><div class="topicref" data-id="concept_nww_hzh_pzb"><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li><div class="topicref" data-id="id"><div class="title"><a href="../../../topics/sdk/pwm/pwm_user_guide.html">PWM 使用指南</a></div></div></li><li class="active"><div class="topicref" data-id="id"><div class="title"><a href="../../../topics/sdk/pwm/pwm_faq.html">常见问题</a></div></div></li></ol></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_navigation_links "><span id="topic_navigation_links" class="navheader">
|
||
|
||
<span class="navprev"><a class="- topic/link link" href="../../../topics/sdk/pwm/pwm_design_lite.html" title="设计说明" aria-label="上一主题: 设计说明" rel="prev"></a></span>
|
||
<span class="navnext"><a class="- topic/link link" href="../../../topics/sdk/rtp/rtp_user_guide.html" title="RTP 使用指南" aria-label="下一主题: RTP 使用指南" rel="next"></a></span> </span></div>
|
||
|
||
|
||
|
||
<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>
|
||
|
||
<button type="button" id="wh_toc_button" class="custom-toggler navbar-toggler collapsed wh_toggle_button navbar-light" aria-expanded="false" aria-label="Toggle publishing table of content" aria-controls="wh_publication_toc">
|
||
<span class="navbar-toggler-icon"></span>
|
||
</button>
|
||
</div>
|
||
|
||
</nav>
|
||
</div>
|
||
|
||
|
||
|
||
|
||
<div class="wh_content_area">
|
||
<div class="row">
|
||
|
||
<nav id="wh_publication_toc" class="col-lg-3 col-md-3 col-sm-12 d-md-block d-none d-print-none" aria-label="Table of Contents Container">
|
||
<div id="wh_publication_toc_content">
|
||
|
||
<div class=" wh_publication_toc " data-tooltip-position="right"><span class="expand-button-action-labels"><span id="button-expand-action" role="button" aria-label="Expand"></span><span id="button-collapse-action" role="button" aria-label="Collapse"></span><span id="button-pending-action" role="button" aria-label="Pending"></span></span><ul role="tree" aria-label="Table of Contents"><li role="treeitem"><div data-tocid="revinfo_linux-d3752e463" class="topicref" data-id="revinfo_linux" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/revinfo/revinfo_rtos.html" id="revinfo_linux-d3752e463-link">修订记录</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e480" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e480-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/env/sdk-compile.html" id="id-d3752e480-link">SDK 编译</a><div class="wh-tooltip"><p class="shortdesc">介绍不同编译环境下 SDK 的详细编译流程。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e604" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e604-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/advanced/sdk-usage.html" id="id-d3752e604-link">使用指南</a><div class="wh-tooltip"><p class="shortdesc">命令详解，编译选项，镜像和分区配置，添加应用和驱动等的详细使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_rcx_czh_pzb-d3752e1004" class="topicref" data-id="concept_rcx_czh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_rcx_czh_pzb-d3752e1004-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/chapter-app.html" id="concept_rcx_czh_pzb-d3752e1004-link">应用场景</a><div class="wh-tooltip"><p class="shortdesc">描述了 SDK 在不同应用场景中的配置和使用，包括系统更新、OTA、安全方案等。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e1848" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e1848-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/peripheral/peripheral-intro.html" id="id-d3752e1848-link">外设移植</a><div class="wh-tooltip"><p class="shortdesc"><span class="ph">CTP、U 盘、SD 卡、有线和无线网络</span>等外设的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e2022" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e2022-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/bringup/chapter-bringup.html" id="id-d3752e2022-link">BringUp</a><div class="wh-tooltip"><p class="shortdesc">主要描述板卡的各项配置，使 SDK 的环境和板卡匹配，并确保 SDK 编译后的固件能够在板子上正常运行。</p></div></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="id-d3752e2418" class="topicref" data-id="id" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action id-d3752e2418-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/chapter-advanced-app.html" id="id-d3752e2418-link">高级应用</a><div class="wh-tooltip"><p class="shortdesc">系统、存储、多媒体、接口、安全等模块的详细配置和设计说明。</p></div></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="_0-d3752e2435" class="topicref" data-id="_0" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action _0-d3752e2435-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/boot/lite_boot_direct.html" id="_0-d3752e2435-link">启动引导</a><div class="wh-tooltip"><p class="shortdesc">启动引导程序 Bootloader 可以实现加载启动应用程序、 烧录和升级功能。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-system-d3752e2619" class="topicref" data-id="chapter-system" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-system-d3752e2619-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-system.html" id="chapter-system-d3752e2619-link">系统</a><div class="wh-tooltip"><p class="shortdesc"></p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-memory-d3752e3709" class="topicref" data-id="chapter-memory" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-memory-d3752e3709-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-memory-sdk.html" id="chapter-memory-d3752e3709-link">存储</a><div class="wh-tooltip"><p class="shortdesc">SDMC、<span class="ph">PSRAM、</span>SPI NAND、SPI NOR 等存储模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_mcc_32s_nbc-d3752e4043" class="topicref" data-id="concept_mcc_32s_nbc" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_mcc_32s_nbc-d3752e4043-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-multi-media-sdk.html" id="concept_mcc_32s_nbc-d3752e4043-link">多媒体</a><div class="wh-tooltip"><p class="shortdesc">GE、VE、Display、DVP、MPP、MPP 播放器等多媒体模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="concept_nww_hzh_pzb-d3752e5544" class="topicref" data-id="concept_nww_hzh_pzb" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action concept_nww_hzh_pzb-d3752e5544-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d3752e5544-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="can-d3752e5564" class="topicref" data-id="can" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action can-d3752e5564-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/can/can_user_guide.html" id="can-d3752e5564-link">CAN 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e5648" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e5648-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/cap/cap_user_guide.html" id="id-d3752e5648-link">CAP 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e5718" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e5718-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/qep/qep_user_guide.html" id="id-d3752e5718-link">QEP 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="cir-d3752e5802" class="topicref" data-id="cir" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action cir-d3752e5802-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/cir/cir_user_guide.html" id="cir-d3752e5802-link">CIR 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="gpai-user-guide-d3752e5928" class="topicref" data-id="gpai-user-guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action gpai-user-guide-d3752e5928-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/gpai/gpai_user_guide.html" id="gpai-user-guide-d3752e5928-link">GPAI 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e6012" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e6012-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/gpio/gpio_user_guide.html" id="id-d3752e6012-link">GPIO 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="i2c_user_guide-d3752e6096" class="topicref" data-id="i2c_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action i2c_user_guide-d3752e6096-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/i2c/i2c_user_guide.html" id="i2c_user_guide-d3752e6096-link">I2C 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e6208" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e6208-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/psadc/psadc_user_guide.html" id="id-d3752e6208-link">PSADC 使用指南</a></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="id-d3752e6292" class="topicref" data-id="id" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action id-d3752e6292-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_user_guide.html" id="id-d3752e6292-link">PWM 使用指南</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem"><div data-tocid="id-d3752e6306" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_config_lite.html" id="id-d3752e6306-link">参数配置</a></div></div></li><li role="treeitem"><div data-tocid="id-d3752e6320" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_debug_lite.html" id="id-d3752e6320-link">调试指南</a></div></div></li><li role="treeitem"><div data-tocid="id-d3752e6334" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_test_lite.html" id="id-d3752e6334-link">测试指南</a></div></div></li><li role="treeitem"><div data-tocid="id-d3752e6348" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_design_lite.html" id="id-d3752e6348-link">设计说明</a></div></div></li><li role="treeitem" class="active"><div data-tocid="id-d3752e6362" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/pwm/pwm_faq.html" id="id-d3752e6362-link">常见问题</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="rtp-user-guide-d3752e6376" class="topicref" data-id="rtp-user-guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action rtp-user-guide-d3752e6376-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/rtp/rtp_user_guide.html" id="rtp-user-guide-d3752e6376-link">RTP 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="spi-d3752e6475" class="topicref" data-id="spi" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action spi-d3752e6475-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/spi/spi_user_guide.html" id="spi-d3752e6475-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-d3752e6561" class="topicref" data-id="uart_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action uart_user_guide-d3752e6561-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/uart/uart_user_guide.html" id="uart_user_guide-d3752e6561-link">UART 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_user_guide-d3752e6645" class="topicref" data-id="usb_user_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_user_guide-d3752e6645-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_user_guide.html" id="usb_user_guide-d3752e6645-link">USB 使用指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="id-d3752e6715" class="topicref" data-id="id" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action id-d3752e6715-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/mac/mac_user_guide.html" id="id-d3752e6715-link">MAC 使用指南</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d3752e6799" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d3752e6799-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d3752e6799-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>
|
||
|
||
</div>
|
||
</nav>
|
||
|
||
|
||
<div class="col-lg-7 col-md-9 col-sm-12" id="wh_topic_body">
|
||
<button id="wh_close_publication_toc_button" class="close-toc-button d-none" aria-label="Toggle publishing table of content" aria-controls="wh_publication_toc" aria-expanded="true">
|
||
<span class="close-toc-icon-container">
|
||
<span class="close-toc-icon"></span>
|
||
</span>
|
||
</button>
|
||
<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 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://aicdocco/taskstopics/sdk/pwm/pwm_faq.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">常见问题</h1>
|
||
<div class="date inPage">16 May 2025</div><div style="color: gray;">
|
||
Read time: 2 minute(s)
|
||
</div>
|
||
<div class="- topic/body body">
|
||
<section class="- topic/section section" id="id__section_atp_kls_21c" data-ofbid="id__section_atp_kls_21c"><h2 class="- topic/title title sectiontitle">每个 PWM 控制器的两路输出信号有什么关系？</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d108227e33__20250519091516">每个控制器可以控制两路输出 PWM 信号，这两路信号从设计上有三个约束条件：</p>
|
||
<ol class="- topic/ol ol" id="id__ol_btp_kls_21c" data-ofbid="id__ol_btp_kls_21c">
|
||
<li class="- topic/li li" data-ofbid="d108227e38__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e40__20250519091516">共用同一个 <strong class="+ topic/ph hi-d/b ph b">time-base 信号</strong>，<span class="- topic/ph ph">即共用一路输入时钟信号，也共用了一个计数器</span></p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d108227e49__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e51__20250519091516">共用同一个 <strong class="+ topic/ph hi-d/b ph b">PWM 信号频率</strong> 配置参数。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d108227e58__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e60__20250519091516">共用同一个 <strong class="+ topic/ph hi-d/b ph b">占空比</strong> 配置参数。</p>
|
||
</li>
|
||
</ol>
|
||
<p class="- topic/p p" data-ofbid="d108227e68__20250519091516">上述 “PWM 信号频率” 和 “占空比” 由 PWM 的 <strong class="+ topic/ph hi-d/b ph b">调用者运行时配置</strong>。 两路信号可以完全相同，也可以做到亮点差别：</p>
|
||
<ol class="- topic/ol ol" id="id__ol_ctp_kls_21c" data-ofbid="id__ol_ctp_kls_21c">
|
||
<li class="- topic/li li" data-ofbid="d108227e76__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e78__20250519091516">相位相反，在占空比上看到的是一个为正、一个为负。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d108227e82__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e84__20250519091516">可以关闭其中一路，在 DTS 参数中将对应的 Action 配置为 “none” 即可。</p>
|
||
</li>
|
||
</ol>
|
||
</section>
|
||
<section class="- topic/section section" id="id__section_dtp_kls_21c" data-ofbid="id__section_dtp_kls_21c"><h2 class="- topic/title title sectiontitle">PWM 信号的占空比是反向的</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d108227e95__20250519091516">得到的占空比相位是反向的。比如配置 80%，得到的是 20%。</p>
|
||
<p class="- topic/p p" data-ofbid="d108227e98__20250519091516"><strong class="+ topic/ph hi-d/b ph b">原因分析</strong></p>
|
||
<p class="- topic/p p" data-ofbid="d108227e102__20250519091516">PWM 信号的电平跳变方向完全是由几个关键时点的配置参数决定，所以如果碰到占空比反向的情况，直接的调整方法是将配置参数反向设置即可。</p>
|
||
<p class="- topic/p p" data-ofbid="d108227e105__20250519091516"><a class="- topic/xref xref" href="pwm_config_lite.html#id__section_mrf_pzy_gdc">驱动配置</a>
|
||
提供了一些典型的参考配置，可以看到相邻的“负占空比”和“正占空比”参数配置基本是反向的。</p>
|
||
</section>
|
||
|
||
<section class="- topic/section section" id="id__section_fpz_q1z_gdc" data-ofbid="id__section_fpz_q1z_gdc"><h2 class="- topic/title title sectiontitle">PWM 输出频率范围如何计算</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d108227e117__20250519091516">目前 Luban-Lite 中会根据配置的周期（单位纳秒），自动计算出最佳工作时基。本节仅描述如何计算同一时基下的最大最小频率。</p>
|
||
<p class="- topic/p p" data-ofbid="d108227e120__20250519091516">PWM 输出频率与工作时钟频率、配置的周期以及 <code class="+ topic/ph pr-d/codeph ph codeph">action</code>信息相关。</p>
|
||
<p class="- topic/p p" data-ofbid="d108227e126__20250519091516">工作时钟频率和父时钟、分频有关。更多时钟问题，参考 <a class="- topic/xref xref" href="pwm_config_lite.html#id__section_lhg_fyn_4dc">时钟配置</a>。</p>
|
||
<div class="- topic/p p" data-ofbid="d108227e133__20250519091516">以 24 MHz 为例，可推导出最大最小频率：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="id__codeblock_f43_hbz_gdc" data-ofbid="id__codeblock_f43_hbz_gdc">Tclk = <span class="hl-number">1</span> / fclk
|
||
Tprd = Tclk * (prd + <span class="hl-number">1</span>)
|
||
Tprd = (prd + <span class="hl-number">1</span>) / fclk
|
||
fprd = fclk / (prd + <span class="hl-number">1</span>)</pre><ul class="- topic/ul ul" id="id__ul_ms2_3bz_gdc" data-ofbid="id__ul_ms2_3bz_gdc">
|
||
<li class="- topic/li li" data-ofbid="d108227e139__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e141__20250519091516"><code class="+ topic/ph pr-d/codeph ph codeph">fclk</code>：工作时钟频率。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d108227e147__20250519091516">
|
||
<p class="- topic/p p" data-ofbid="d108227e149__20250519091516"><code class="+ topic/ph pr-d/codeph ph codeph">fprd</code>：PWM 输出频率：</p>
|
||
</li>
|
||
</ul></div>
|
||
<div class="- topic/p p" data-ofbid="d108227e157__20250519091516">根据上述公式可以获得 PWM 的输出频率，如下所示：<ul class="- topic/ul ul" id="id__ul_lmy_xbz_gdc" data-ofbid="id__ul_lmy_xbz_gdc">
|
||
<li class="- topic/li li" data-ofbid="d108227e161__20250519091516"><p class="- topic/p p" data-ofbid="d108227e162__20250519091516">最小频率： fprd = 24000000 / (0xFFFF + 1) ≈ 367 Hz </p><p class="- topic/p p" data-ofbid="d108227e164__20250519091516"><code class="+ topic/ph pr-d/codeph ph codeph">PRD</code>
|
||
则可以不动作，“互补”工作交由 <code class="+ topic/ph pr-d/codeph ph codeph">ZRO</code> 与 <code class="+ topic/ph pr-d/codeph ph codeph">CMP</code>
|
||
即可。</p><img class="- topic/image image" id="id__image_gsx_gcz_gdd" src="../../../images/sdk/minfreq.png" alt="mminfreq"/>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d108227e181__20250519091516"><p class="- topic/p p" data-ofbid="d108227e182__20250519091516">最大频率： fprd = 24000000 / (1 + 1) = 12 MHz</p><p class="- topic/p p" data-ofbid="d108227e184__20250519091516">当 <code class="+ topic/ph pr-d/codeph ph codeph">prd 寄存器</code>
|
||
设置为 1 （最小为 1 ）时，<code class="+ topic/ph pr-d/codeph ph codeph">action</code>
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">CMP</code> 部分应配置为不动作，<code class="+ topic/ph pr-d/codeph ph codeph">PRD</code> 与
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">ZRO</code> 互补高低电平，即可输出 12 MHz。</p><img class="- topic/image image" id="id__image_gsx_gcz_gdc" src="../../../images/sdk/maxfreq.png" alt="maxfreq"/></li>
|
||
</ul></div>
|
||
|
||
<div class="- topic/div div">
|
||
<p class="- topic/p p" data-ofbid="d108227e212__20250519091516">最大频率可与最小频率、正常输出频率时一样，只配置 <code class="+ topic/ph pr-d/codeph ph codeph">CMP</code> 与 <code class="+ topic/ph pr-d/codeph ph codeph">ZRO</code> 动作，
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">PRD</code> 不动作，此时配置 <code class="+ topic/ph pr-d/codeph ph codeph">cmp 寄存器</code> 与
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">prd 寄存器</code> 相等理论上能产生一样的效果。但由于驱动中默认设计当 <code class="+ topic/ph pr-d/codeph ph codeph">cmp 寄存器</code> 与
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">prd 寄存器</code> 相等时，为了输出 100% 占空比，<code class="+ topic/ph pr-d/codeph ph codeph">cmp 寄存器</code> 会默认增加
|
||
1。这个问题我们在下章节毛刺问题作出解析。</p>
|
||
</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="#id__section_atp_kls_21c" data-tocid="id__section_atp_kls_21c">每个 PWM 控制器的两路输出信号有什么关系？</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_dtp_kls_21c" data-tocid="id__section_dtp_kls_21c">PWM 信号的占空比是反向的</a></div></li><li class="section-item"><div class="section-title"><a href="#id__section_fpz_q1z_gdc" data-tocid="id__section_fpz_q1z_gdc">PWM 输出频率范围如何计算</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 © 2019-2025 广东匠芯创科技有限公司. All rights reserved.</p>
|
||
</div>
|
||
<div>
|
||
<div class="generation_time">
|
||
Update Time: 2025-05-19
|
||
</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> |