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<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="Inter-IC Sound (I2S) 是一种常见的音频接口，主要用于音频数据的传输。常见的应用场景是 SoC 和音频 codec 通过 I2S 接口实现音频的播放与录音。由于音频数据量较大，SoC 一般通过 DMA 实现音频数据在内存和 I2S 接口之间的传输，所以需要 DMA 驱动的支持。 支持 I2S 标准协议 支持 I2S、左对齐、右对齐、PCM（长帧/ 短帧）、TDM 格式 支持主/ ..."/><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.contributor" content="yan.wang"/><meta name="DC.date.modified" content="2024-12-02"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="i2s"/><meta name="DC.language" content="zh-CN"/><title>I2S 使用指南</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/i2s/i2s_user_guide.dita"/><meta name="wh-out-relpath" content="topics/sdk/i2s/i2s_user_guide.html"/>
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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/i2s/i2s_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">I2S 使用指南</h1><div class="date inPage">2 Dec 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"><p class="- topic/p p" data-ofbid="d340018e22__20250121171859">Inter-IC Sound (I2S) 是一种常见的音频接口，主要用于音频数据的传输。常见的应用场景是 SoC 和音频 codec 通过
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I2S 接口实现音频的播放与录音。由于音频数据量较大，SoC 一般通过 DMA 实现音频数据在内存和 I2S 接口之间的传输，所以需要 DMA 驱动的支持。</p><ul class="- topic/ul ul" id="i2s__ul_i1l_jym_d1c" data-ofbid="i2s__ul_i1l_jym_d1c"><li class="- topic/li li" data-ofbid="d340018e25__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e27__20250121171859">支持 I2S 标准协议</p>
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</li><li class="- topic/li li" data-ofbid="d340018e30__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e32__20250121171859">支持 I2S、左对齐、右对齐、PCM（长帧/ 短帧）、TDM 格式</p>
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</li><li class="- topic/li li" data-ofbid="d340018e35__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e37__20250121171859">支持主/ 从模式</p>
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</li><li class="- topic/li li" data-ofbid="d340018e40__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e42__20250121171859">采样精度支持 8-bit ~ 32-bit</p>
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</li><li class="- topic/li li" data-ofbid="d340018e45__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e47__20250121171859">采样率支持 8 KHz ~ 384 KHz</p>
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</li><li class="- topic/li li" data-ofbid="d340018e50__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e52__20250121171859">TDM 格式下输入输出均支持 16 通道的传输</p>
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</li><li class="- topic/li li" data-ofbid="d340018e55__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e57__20250121171859">支持 8-bit u-law 和 8-bit A-law 压缩数据</p>
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</li><li class="- topic/li li" data-ofbid="d340018e60__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e62__20250121171859">TXFIFO 为 128 x 32bit，RXFIFO 为 64 x 32bit</p>
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</li><li class="- topic/li li" data-ofbid="d340018e65__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e67__20250121171859">FIFO 阈值可调</p>
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</li><li class="- topic/li li" data-ofbid="d340018e70__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e72__20250121171859">支持 CPU 和 DMA 两种方式实现传输</p>
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</li><li class="- topic/li li" data-ofbid="d340018e75__20250121171859">
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<p class="- topic/p p" data-ofbid="d340018e77__20250121171859">支持 loopback 模式</p>
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</li></ul><div class="table-container"><table class="- topic/table table frame-all" id="i2s__table_zpw_3f3_d1c" data-ofbid="i2s__table_zpw_3f3_d1c" 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:22.727272727272727%"/><col style="width:28.636363636363633%"/><col style="width:48.63636363636363%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="i2s__table_zpw_3f3_d1c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="i2s__table_zpw_3f3_d1c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="i2s__table_zpw_3f3_d1c__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="i2s__table_zpw_3f3_d1c__entry__1">MCLK</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2s__table_zpw_3f3_d1c__entry__2">master clock</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2s__table_zpw_3f3_d1c__entry__3">主时钟，为 CODEC 提供工作时钟</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2s__table_zpw_3f3_d1c__entry__1">LRCK</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="i2s__table_zpw_3f3_d1c__entry__2">left right clock</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="i2s__table_zpw_3f3_d1c__entry__3">左右声道时钟，一个周期完成一次左右声道音频数据输出</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2s__table_zpw_3f3_d1c__entry__1">BCLK</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="i2s__table_zpw_3f3_d1c__entry__2">bit clock</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="i2s__table_zpw_3f3_d1c__entry__3">比特时钟，每个时钟周期传输 1bit 音频数据</td></tr></tbody></table></div></div></article></main></div>
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