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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/spi/spi_user_guide.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1"><span class="- topic/ph ph">Q</span>SPI 使用指南</h1><div class="date inPage">3 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"><div class="- topic/p p" data-ofbid="d112367e24__20250121171555">Serial Peripheral Interface (SPI) 是一种高速、全双工的同步通信总线。由于其实现比较简单，没有专利限制等，因此在各种器件中得到广泛的应用。 SPI
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总线是一种行业事实标准，并没有统一的标准化组织，不同厂商在实际应用中演化出多种工作模式。<div class="table-container"><table class="- topic/table table frame-all" id="spi__table_yzq_1wy_21c" data-ofbid="spi__table_yzq_1wy_21c" 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:33.33333333333333%"/><col style="width:33.33333333333333%"/><col style="width:33.33333333333333%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="spi__table_yzq_1wy_21c__entry__1">术语</th><th class="- topic/entry entry colsep-1 rowsep-1" id="spi__table_yzq_1wy_21c__entry__2">定义</th><th class="- topic/entry entry colsep-0 rowsep-1" id="spi__table_yzq_1wy_21c__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="spi__table_yzq_1wy_21c__entry__1">SPI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__2">Serial Peripheral Interface</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__3">串行外设接口</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__1">Dual SPI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__2">Dual Serial Peripheral Interface</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__3">双路 SPI</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__1">Quad SPI</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__2">Quad Serial Peripheral Interface</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__3">四路 SPI，又称 QSPI</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__1">CPOL</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__2">Clock polarity</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_yzq_1wy_21c__entry__3">时钟极性</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi__table_yzq_1wy_21c__entry__1">CPHA</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi__table_yzq_1wy_21c__entry__2">Clock phase</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="spi__table_yzq_1wy_21c__entry__3">时钟相位</td></tr></tbody></table></div></div><section class="- topic/section section" id="spi__section_pzl_z4s_4dc" data-ofbid="spi__section_pzl_z4s_4dc"><h2 class="- topic/title title sectiontitle">模块特性</h2>
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<p class="- topic/p p" data-ofbid="d112367e82__20250121171555">SPI 总线接口的应用领域：</p>
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<ul class="- topic/ul ul" id="spi__ul_ztj_rvy_21c" data-ofbid="spi__ul_ztj_rvy_21c"><li class="- topic/li li" data-ofbid="d112367e86__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e88__20250121171555">存储设备：Flash、SD、MMC、EEPROM 等</p>
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</li><li class="- topic/li li" data-ofbid="d112367e91__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e93__20250121171555">传感器：温度传感器、压力传感器等</p>
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</li><li class="- topic/li li" data-ofbid="d112367e96__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e98__20250121171555">ADC/DAC</p>
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</li><li class="- topic/li li" data-ofbid="d112367e101__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e103__20250121171555">Audio Codec</p>
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</li><li class="- topic/li li" data-ofbid="d112367e106__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e108__20250121171555">LCD 显示屏幕</p>
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</li><li class="- topic/li li" data-ofbid="d112367e111__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e113__20250121171555">触摸屏幕</p>
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</li><li class="- topic/li li" data-ofbid="d112367e116__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e118__20250121171555">RTC</p>
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</li><li class="- topic/li li" data-ofbid="d112367e121__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e123__20250121171555">数字电位计</p>
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</li><li class="- topic/li li" data-ofbid="d112367e126__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e128__20250121171555">游戏控制器等</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d112367e132__20250121171555">ArtInChip SPI 支持：</p>
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<ul class="- topic/ul ul" id="spi__ul_b5j_rvy_21c" data-ofbid="spi__ul_b5j_rvy_21c"><li class="- topic/li li" data-ofbid="d112367e136__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e138__20250121171555">全双工、半双工模式</p>
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</li><li class="- topic/li li" data-ofbid="d112367e141__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e143__20250121171555">DMA 读写模式</p>
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</li><li class="- topic/li li" data-ofbid="d112367e146__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e148__20250121171555">CPU 读写模式</p>
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</li><li class="- topic/li li" data-ofbid="d112367e151__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e153__20250121171555">最高工作频率 100MHz</p>
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</li><li class="- topic/li li" data-ofbid="d112367e156__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e158__20250121171555">支持四线制模式：标准 4 线 SPI、DUAL SPI、QUAD SPI</p>
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</li><li class="- topic/li li" data-ofbid="d112367e161__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e163__20250121171555">支持三线制模式</p>
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</li><li class="- topic/li li" data-ofbid="d112367e166__20250121171555">
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<p class="- topic/p p" data-ofbid="d112367e168__20250121171555">数据位传输的模式可配置，CPOL 和 CPHA</p>
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</li></ul>
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</section><section class="- topic/section section" id="spi__section_c5j_rvy_21c" data-ofbid="spi__section_c5j_rvy_21c"><h2 class="- topic/title title sectiontitle">标准 4 线 SPI</h2>
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<p class="- topic/p p" data-ofbid="d112367e177__20250121171555">这是一种四线制的 SPI 连接和工作模式。</p>
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<figure class="- topic/fig fig fignone" id="spi__fig_kvq_wvy_21c" data-ofbid="spi__fig_kvq_wvy_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="spi__image_d5j_rvy_21c" src="../../../images/spi/4line_standard_spi.png" alt="4line_standard_spi"/></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">四线制标准 SPI</span></figcaption></figure>
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</section><section class="- topic/section section" id="spi__section_e5j_rvy_21c" data-ofbid="spi__section_e5j_rvy_21c"><h2 class="- topic/title title sectiontitle">DUAL SPI</h2>
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<p class="- topic/p p" data-ofbid="d112367e192__20250121171555">主机端的 MISO 为 SIO0, MOSI 为 SIO1，常用于 SPI Flash。</p>
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<figure class="- topic/fig fig fignone" id="spi__fig_ibv_vvy_21c" data-ofbid="spi__fig_ibv_vvy_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="spi__image_f5j_rvy_21c" src="../../../images/spi/dual_spi1.png" alt="dual_spi1"/></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"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">四线制 DUAL SPI</span></figcaption></figure>
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</section><section class="- topic/section section" id="spi__section_g5j_rvy_21c" data-ofbid="spi__section_g5j_rvy_21c"><h2 class="- topic/title title sectiontitle">QUAD SPI</h2>
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<p class="- topic/p p" data-ofbid="d112367e207__20250121171555">主机端的 MOSI 为 IO0, MISO 为 IO1, WP 为 IO2, HOLD 为 IO3，常用于 SPI Flash。</p>
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<figure class="- topic/fig fig fignone" id="spi__fig_fqw_5vy_21c" data-ofbid="spi__fig_fqw_5vy_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="spi__image_h5j_rvy_21c" src="../../../images/spi/quad_spi.png" alt="quad_spi"/></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"> 3</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">四线制 QUAD SPI</span></figcaption></figure>
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</section><section class="- topic/section section" id="spi__section_i5j_rvy_21c" data-ofbid="spi__section_i5j_rvy_21c"><h2 class="- topic/title title sectiontitle">三线制 SPI</h2>
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<p class="- topic/p p" data-ofbid="d112367e222__20250121171555">三线制 SPI 常用于工业控制类场景。这种接线方式，主机端使用 MOSI 作为 DIO。</p>
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||
<figure class="- topic/fig fig fignone" id="spi__fig_qnc_5vy_21c" data-ofbid="spi__fig_qnc_5vy_21c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="spi__image_j5j_rvy_21c" src="../../../images/spi/3line_spi.png" alt="3line_spi1"/></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"> 4</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">三线制 SPI</span></figcaption></figure>
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</section><section class="- topic/section section" id="spi__section_k5j_rvy_21c" data-ofbid="spi__section_k5j_rvy_21c"><h2 class="- topic/title title sectiontitle">CPOL 与 CPHA</h2>
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<p class="- topic/p p" data-ofbid="d112367e237__20250121171555">CPHA 是时钟相位，CPOL 是时钟极性，两者的不同组合是 SPI 数据传输的不同模式。</p>
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<div class="table-container"><table class="- topic/table table frame-all" id="spi__table_l5j_rvy_21c" data-ofbid="spi__table_l5j_rvy_21c" data-cols="2"><caption></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="spi__table_l5j_rvy_21c__entry__1">CPHA</th><th class="- topic/entry entry colsep-0 rowsep-1" id="spi__table_l5j_rvy_21c__entry__2">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_l5j_rvy_21c__entry__1">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_l5j_rvy_21c__entry__2">数据采样在第 1 个边沿，数据发送在第 2 个边沿</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi__table_l5j_rvy_21c__entry__1">1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="spi__table_l5j_rvy_21c__entry__2">数据采样在第 2 个边沿，数据发送在第 1 个边沿</td></tr></tbody></table></div>
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||
<div class="table-container"><table class="- topic/table table frame-all" id="spi__table_m5j_rvy_21c" data-ofbid="spi__table_m5j_rvy_21c" data-cols="2"><caption></caption><colgroup><col style="width:16.666666666666664%"/><col style="width:83.33333333333334%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="spi__table_m5j_rvy_21c__entry__1">CPOL</th><th class="- topic/entry entry colsep-0 rowsep-1" id="spi__table_m5j_rvy_21c__entry__2">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_m5j_rvy_21c__entry__1">0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_m5j_rvy_21c__entry__2">空闲状态时，SCK 为低电平</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi__table_m5j_rvy_21c__entry__1">1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="spi__table_m5j_rvy_21c__entry__2">空闲状态时，SCK 为高电平</td></tr></tbody></table></div>
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<div class="table-container"><table class="- topic/table table frame-all" id="spi__table_n5j_rvy_21c" data-ofbid="spi__table_n5j_rvy_21c" data-cols="3"><caption></caption><colgroup><col style="width:16.393442622950822%"/><col style="width:29.672131147540988%"/><col style="width:53.934426229508205%"/></colgroup><thead class="- topic/thead thead"><tr class="- topic/row"><th class="- topic/entry entry colsep-1 rowsep-1" id="spi__table_n5j_rvy_21c__entry__1">Mode</th><th class="- topic/entry entry colsep-1 rowsep-1" id="spi__table_n5j_rvy_21c__entry__2">值</th><th class="- topic/entry entry colsep-0 rowsep-1" id="spi__table_n5j_rvy_21c__entry__3">说明</th></tr></thead><tbody class="- topic/tbody tbody"><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__1">0</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__2">CPOL=0, CPHA=0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__3">空闲时，SCK 处于低电平数据采样在上升沿，下降沿保持</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__1">1</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__2">CPOL=0, CPHA=1</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__3">空闲时，SCK 处于高电平数据采样在下降沿，上升沿保持</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__1">2</td><td class="- topic/entry entry colsep-1 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__2">CPOL=1, CPHA=0</td><td class="- topic/entry entry colsep-0 rowsep-1" headers="spi__table_n5j_rvy_21c__entry__3">空闲时，SCK 处于低电平数据采样在下降沿，上升沿保持</td></tr><tr class="- topic/row"><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi__table_n5j_rvy_21c__entry__1">3</td><td class="- topic/entry entry colsep-1 rowsep-0" headers="spi__table_n5j_rvy_21c__entry__2">CPOL=1, CPHA=1</td><td class="- topic/entry entry colsep-0 rowsep-0" headers="spi__table_n5j_rvy_21c__entry__3">空闲时，SCK 处于高电平数据采样在上升沿，下降沿保持</td></tr></tbody></table></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="#spi__section_pzl_z4s_4dc" data-tocid="spi__section_pzl_z4s_4dc">模块特性</a></div></li><li class="section-item"><div class="section-title"><a href="#spi__section_c5j_rvy_21c" data-tocid="spi__section_c5j_rvy_21c">标准 4 线 SPI</a></div></li><li class="section-item"><div class="section-title"><a href="#spi__section_e5j_rvy_21c" data-tocid="spi__section_e5j_rvy_21c">DUAL SPI</a></div></li><li class="section-item"><div class="section-title"><a href="#spi__section_g5j_rvy_21c" data-tocid="spi__section_g5j_rvy_21c">QUAD SPI</a></div></li><li class="section-item"><div class="section-title"><a href="#spi__section_i5j_rvy_21c" data-tocid="spi__section_i5j_rvy_21c">三线制 SPI</a></div></li><li class="section-item"><div class="section-title"><a href="#spi__section_k5j_rvy_21c" data-tocid="spi__section_k5j_rvy_21c">CPOL 与 CPHA</a></div></li></ul></div>
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