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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/spienc/spi-enc-architecture.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">模块架构</h1><div class="date inPage">8 Jul 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="d346966e22__20250121172121"></p><p class="- topic/p p" data-ofbid="d346966e23__20250121172121">SPIENC 驱动 Driver 层采用直接调用 HAL 层的接口，如果只使用 HAL 层也可以支持 Baremetal
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方式的应用场景。</p><figure class="- topic/fig fig fignone" id="spi_enc_architecture__fig_vd2_czq_g1c" data-ofbid="spi_enc_architecture__fig_vd2_czq_g1c"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="spi_enc_architecture__image_xks_bzq_g1c" src="../../../images/spienc/sw_system9.png" alt="sw_system9"/></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">SPIENC 驱动的软件架构图</span></figcaption></figure><p class="- topic/p p" data-ofbid="d346966e31__20250121172121">文件系统或者应用程序通过 MTD 层访问 SPI NOR / SPI NAND 设备的数据，SPI NOR / SPI NAND 驱动在通过 SPI 总线传输数据。</p><p class="- topic/p p" data-ofbid="d346966e33__20250121172121">在 SPI NOR / SPI NAND 驱动通过 SPI 总线访问相关数据时，其实需要发送一系列的命令来进行数据的读写。 这个过程中，命令通信的数据，包括一些读写 SPI
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NOR / SPI NAND 的寄存器数据都不能加密， 仅存储数据部分需要进行加密处理。因此，虽然 SPI_ENC 是在硬件总线上对数据进行加密， 但是软件使用时需要在 SPI
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NOR / SPI NAND 驱动 根据需要，提供必要的加解密信息（数据地址和长度）， 并且启动相应的数据传输加解密。</p><p class="- topic/p p" data-ofbid="d346966e35__20250121172121">因此在软件层次上，SPI NOR / SPI NAND 驱动依赖 SPI 驱动以及 SPI_ENC 驱动，而 SPI 驱动与 SPI_ENC 驱动是并列关系。</p></div></article></main></div>
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