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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/xpwm/xpwm_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">XPWM 使用指南</h1><div class="date inPage">29 Nov 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"><div class="table-container"><table class="- topic/table table frame-all" data-ofbid="d301612e17__20250121171807" data-cols="2"><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/><col/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="id__entry__1">术语/缩略语</th><th class="- topic/entry entry colsep-0 rowsep-1" id="id__entry__2">定义及说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__entry__1">XPWM</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__entry__2">Extend Pulse-Width
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Modulation，拓展脉冲宽度控制，简称脉宽调制</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__entry__1">占空比</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__entry__2">PWM 信号中，高电平保持的时间 与 该 PWM 时钟周期的时间之比</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="id__entry__1">FIFO</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="id__entry__2">First In First Out, 先进先出数据存储、缓冲器</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="id__entry__1">DMA</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="id__entry__2">Direct Memory Access,直接内存访问</td></tr></tbody></table></div><section class="- topic/section section" id="id__section_wzb_cj3_fdc" data-ofbid="id__section_wzb_cj3_fdc"><h2 class="- topic/title title sectiontitle">XPWM 功能简介</h2>
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<div class="- topic/div div section" id="id__pwm">
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<strong class="+ topic/ph hi-d/b ph b">PWM 输出模式</strong>
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<p class="- topic/p p" data-ofbid="d301612e60__20250121171807"> PWM 信号通常由一列占空比不同的矩形脉冲构成，其占空比可以调节。用数字输出来控制 PWM 占空比，占空比提高意味着高电平脉宽增大，输出的能量就会增加，PWM
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就相当于一个 <strong class="+ topic/ph hi-d/b ph b">功率版的 DA 转换模块</strong>。下图是一个典型的 PWM 信号波形：</p><figure class="- topic/fig fig fignone" id="id__id4" data-ofbid="id__id4"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" src="../../../images/xpwm/pwm_wave.png" alt="pwm_wave"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">图 6.106 典型的 PWM 信号波形</span></figcaption></figure>
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<p class="- topic/p p" data-ofbid="d301612e72__20250121171807">占空比的计算方法： <code class="+ topic/ph pr-d/codeph ph codeph">占空比=(脉宽时间/周期)*100%</code></p><p class="- topic/p p" data-ofbid="d301612e76__20250121171807">结合上图，我们可以说： 脉宽时间 1 相比 脉宽时间 2
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提供较小的占空比。</p>
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</div>
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<div class="- topic/div div section" id="id__id3">
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<strong class="+ topic/ph hi-d/b ph b">脉冲输出模式</strong>
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<p class="- topic/p p" data-ofbid="d301612e85__20250121171807">脉冲输出模式支持三种方式实现脉冲输出的功能，分别是自由方式（未采用中断和 DMA）、持续方式（采用中断）、FIFO（采用中断或 DMA）方式。</p><ol class="- topic/ol ol arabic simple" data-ofbid="d301612e87__20250121171807"><li class="- topic/li li" data-ofbid="d301612e88__20250121171807">
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<p class="- topic/p p" data-ofbid="d301612e90__20250121171807"> 自由方式输出脉冲，每设置一次发送脉冲数量的数值，XPWM 输出则发送相应数量的脉冲后则处于一直 IDLE 的状态（IDLE
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状态可以设置为输出高电平或低电平）。</p>
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</li><li class="- topic/li li" data-ofbid="d301612e93__20250121171807">
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<p class="- topic/p p" data-ofbid="d301612e95__20250121171807"> 持续方式输出脉冲，即通过中断，每次中断函数进行设置下次发送脉冲数量的数值，XPWM 输出则一直按照设置的数值持续发送脉冲。</p>
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</li><li class="- topic/li li" data-ofbid="d301612e98__20250121171807">
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<p class="- topic/p p" data-ofbid="d301612e100__20250121171807">FIFO 方式输出脉冲，是利用内置的 FIFO
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对影子寄存器的更新方式，实现持续发送脉冲。这样相对上面提到的持续方式，可以大大提高脉冲输出的效率，避免频繁进入中断函数。</p>
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