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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/usb/usb-aic_usb_device_controller.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">AIC USB Device Controller</h1><div class="date inPage">4 Feb 2024</div><div style="color: gray;">
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Read time: 12 minute(s)
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</div><div class="- topic/body concept/conbody body conbody"><p class="- topic/p p" data-ofbid="d304171e22__20250121171809">ArtInChip UDC 在硬件层面实现了以下功能：</p><section class="- topic/section section" id="usb_aic_usb_device_controller__section_epf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_epf_2qz_21c"><h2 class="- topic/title title sectiontitle">Data Mode</h2>
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<p class="- topic/p p" data-ofbid="d304171e29__20250121171809">UDC 实现的一项主要工作是数据搬移：</p>
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<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_fpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_fpf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e33__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e35__20250121171809">UDC 发送时，数据先从内存 Memory 搬移到 UDC 的内部 FIFO 当中，然后由 UDC 发送到 USB 物理线路上。</p>
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</li><li class="- topic/li li" data-ofbid="d304171e38__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e40__20250121171809">UDC 接收时，数据先从 USB 物理线路接收到 UDC 的内部 FIFO 当中，然后再从 FIFO 拷贝到 内存 Memory 当中。</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d304171e44__20250121171809">对于 <code class="+ topic/ph pr-d/codeph ph codeph">FIFO</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">Memory</code> 之间的数据搬移工作，当前 UDC 支持两种方式：</p>
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<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_gpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_gpf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e54__20250121171809"><p class="- topic/p p" data-ofbid="d304171e55__20250121171809">DMA Mode。</p><div class="- topic/p p" data-ofbid="d304171e57__20250121171809"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_usb_device_controller__image_hpf_2qz_21c" src="../../../images/usb/usb_udc_mode_dma.png" alt="image1"/></div><br/></div><p class="- topic/p p" data-ofbid="d304171e61__20250121171809">由 UDC 内部的 DMA 模块来承担数据搬移工作，只要使用寄存器配置好 FIFO 的分配，以及在寄存器中配置好 DMA
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的其实地址，DMA 会完成数据的搬移。</p></li><li class="- topic/li li" data-ofbid="d304171e63__20250121171809"><p class="- topic/p p" data-ofbid="d304171e64__20250121171809">Slave Mode。</p><div class="- topic/p p" data-ofbid="d304171e66__20250121171809"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_usb_device_controller__image_jpf_2qz_21c" src="../../../images/usb/usb_udc_mode_slave.png" alt="image2"/></div><br/></div><p class="- topic/p p" data-ofbid="d304171e70__20250121171809">也可以不使用 DMA 而直接使用 CPU 来搬移，这种方式非常消耗 CPU 的带宽，CPU
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被简单重复的数据拷贝拖住不能做其他的事情。这种方式一般用于 Debug 模式。</p></li></ul>
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</section><section class="- topic/section section" id="usb_aic_usb_device_controller__section_kpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_kpf_2qz_21c"><h2 class="- topic/title title sectiontitle">Endpoint FIFO Mode</h2>
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<p class="- topic/p p" data-ofbid="d304171e78__20250121171809">不同的 UDC 中 Endpoint 对 FIFO 的使用有多种模式，当前 UDC 选用的是 <code class="+ topic/ph pr-d/codeph ph codeph">Shared Transmit FIFO</code>
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模式。在 <code class="+ topic/ph pr-d/codeph ph codeph">Shared Transmit FIFO</code> 模式中， <code class="+ topic/ph pr-d/codeph ph codeph">Endpoint</code> 对
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<code class="+ topic/ph pr-d/codeph ph codeph">FIFO</code> 使用模式如下：</p>
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<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_lpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_lpf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e94__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e96__20250121171809">所有的 <code class="+ topic/ph pr-d/codeph ph codeph">non-periodic IN endpoints</code> 共享一个 <code class="+ topic/ph pr-d/codeph ph codeph">transmit
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FIFO</code> 。 <code class="+ topic/ph pr-d/codeph ph codeph">non-periodic endpoints</code> 包括
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<code class="+ topic/ph pr-d/codeph ph codeph">isochronous transfers</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">interrupt
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transfers</code>。</p>
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</li><li class="- topic/li li" data-ofbid="d304171e114__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e116__20250121171809">每一个 <code class="+ topic/ph pr-d/codeph ph codeph">periodic IN endpoint</code> 独立拥有一个 <code class="+ topic/ph pr-d/codeph ph codeph">transmit
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FIFO</code> 。 <code class="+ topic/ph pr-d/codeph ph codeph">periodic endpoints</code> 包括 <code class="+ topic/ph pr-d/codeph ph codeph">bulk
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transfers</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">control transfers</code>。</p>
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</li><li class="- topic/li li" data-ofbid="d304171e134__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e136__20250121171809">所有的 <code class="+ topic/ph pr-d/codeph ph codeph">OUT endpoints</code> 共享一个 <code class="+ topic/ph pr-d/codeph ph codeph">receive FIFO</code>。</p>
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</li></ul>
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</section><section class="- topic/section section" id="usb_aic_usb_device_controller__section_mpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_mpf_2qz_21c"><h2 class="- topic/title title sectiontitle">Endpoint Resource</h2>
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<p class="- topic/p p" data-ofbid="d304171e151__20250121171809">USB 协议定义一个 Device 最多可以实现 16 个 IN endpoint + 16 个 OUT endpoint。当前 UDC 实现了 5 个 IN
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endpoint + 5 个 OUT endpoint，除了 endpoint 0 IN/OUT 被系统默认使用，剩下的可以被驱动动态分配使用。</p>
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<p class="- topic/p p" data-ofbid="d304171e154__20250121171809">如上一节所描述，UDC 是 <code class="+ topic/ph pr-d/codeph ph codeph">Shared Transmit FIFO</code> 模式， <code class="+ topic/ph pr-d/codeph ph codeph">periodic IN
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endpoint</code> 需要拥有一个独立的 <code class="+ topic/ph pr-d/codeph ph codeph">transmit FIFO</code>。当前 UDC 拥有两个这样的
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<code class="+ topic/ph pr-d/codeph ph codeph">transmit FIFO</code> 资源，供驱动动态分配。</p>
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<p class="- topic/p p" data-ofbid="d304171e169__20250121171809">如果驱动创建一个 <code class="+ topic/ph pr-d/codeph ph codeph">periodic IN endpoint</code> 它分配到了第一个 <code class="+ topic/ph pr-d/codeph ph codeph">endpoint</code>
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资源，但是没有分配到 <code class="+ topic/ph pr-d/codeph ph codeph">transmit FIFO</code> 资源，也会创建失败。</p>
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</section><section class="- topic/section section" id="usb_aic_usb_device_controller__section_npf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_npf_2qz_21c"><h2 class="- topic/title title sectiontitle">Calculating FIFO Size</h2>
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<div class="- topic/p p" data-ofbid="d304171e186__20250121171809"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_usb_device_controller__image_opf_2qz_21c" src="../../../images/usb/usb_udc_fifo_size.png" alt="image3"/></div><br/></div>
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<p class="- topic/p p" data-ofbid="d304171e191__20250121171809">由上几节的描述可以看到，UDC 有多个模块需要使用内部 FIFO。包括：</p>
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<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_ppf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_ppf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e195__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e197__20250121171809">OUT endpoints RxFIFO</p>
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</li><li class="- topic/li li" data-ofbid="d304171e200__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e202__20250121171809">IN non-periodic endpoints TxFIFO</p>
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</li><li class="- topic/li li" data-ofbid="d304171e205__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e207__20250121171809">IN periodic endpoints TxFIFO</p>
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</li><li class="- topic/li li" data-ofbid="d304171e210__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e212__20250121171809">DMA</p>
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</li></ul>
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<p class="- topic/p p" data-ofbid="d304171e216__20250121171809">UDC 内部 FIFO 总大小是固定的，那么怎么样来分配 FIFO 空间给这些模块呢？ UDC 提供了以下计算公式：</p>
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<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_qpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_qpf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e221__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e223__20250121171809">Receive FIFO RAM allocation</p>
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<blockquote class="- topic/lq lq" id="usb_aic_usb_device_controller__lq_rpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__lq_rpf_2qz_21c">RAM for SETUP Packets: 4 * n + 6 locations in
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Scatter/Gather DMA mode and 5 * n+6 locations in Slave and Buffer DMA mode
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must be reserved in the RxFIFO to receive up to n SETUP packets on control
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endpoints, where n is the number of control endpoints the device core
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supports. The core does not use these locations, which are Reserved for
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SETUP packets, to write any other data.// Setup 包的保留 RAM 空间(DMA 模式)： <em class="+ topic/ph hi-d/i ph i">5*n
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+ 6</em> locations，<em class="+ topic/ph hi-d/i ph i">n</em> 为 <em class="+ topic/ph hi-d/i ph i">control endpoints</em> 的个数。该部分只为 SETUP
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包保留，不会写入其他数据。One location for Global OUT NAK// Global OUT NAK: <em class="+ topic/ph hi-d/i ph i">1</em>
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locationStatus information is written to the FIFO along with each received
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packet. Therefore, a minimum space of (Largest Packet Size / 4) + 1 must be
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allotted to receive packets. If a high-bandwidth endpoint is enabled, or
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multiple isochronous endpoints are enabled, then at least two (Largest
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Packet Size / 4) + 1 spaces must be allotted to receive back-to-back
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packets. Typically, two (Largest Packet Size / 4) + 1 spaces are recommended
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so that when the previous packet is being transferred to AHB, the USB can
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receive the subsequent packet. If AHB latency is high, you must allocate
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enough space to receive multiple packets. This is critical to prevent
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dropping of any isochronous packets.// 包接收空间： 最少 <em class="+ topic/ph hi-d/i ph i">(Largest Packet Size /
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4) + 1</em> spaces，如果空间充裕使用 two <em class="+ topic/ph hi-d/i ph i">(Largest Packet Size / 4) + 1</em>
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spacesAlong with each endpoint’s last packet, transfer complete status
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information is also pushed to the FIFO. Typically, one location for each OUT
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endpoint is recommended.// 对于每个 OUT endpoint ，最后一个包需要一个位置存放 <em class="+ topic/ph hi-d/i ph i">transfer
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complete status information</em>An additional endpoint for each EPDisable
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is also required.// 对于每个 OUT endpoint ，还需要一个位置存放 <em class="+ topic/ph hi-d/i ph i">EPDisable</em>计算公式：Device
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RxFIFO = <em class="+ topic/ph hi-d/i ph i">(5 * number of control endpoints + 8)</em> + <em class="+ topic/ph hi-d/i ph i">((largest USB
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packet used / 4) + 1 for status information)</em> + <em class="+ topic/ph hi-d/i ph i">(2 * number of OUT
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endpoints)</em> + <em class="+ topic/ph hi-d/i ph i">1 for Global NAK</em></blockquote>
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</li></ul>
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<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_spf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_spf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e268__20250121171809">
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<p class="- topic/p p" data-ofbid="d304171e270__20250121171809">Transmit FIFO RAM allocation</p>
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<blockquote class="- topic/lq lq" id="usb_aic_usb_device_controller__lq_tpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__lq_tpf_2qz_21c">The RAM size for the Periodic Transmit FIFO must equal
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the maximum amount of data that can be transmitted in a single microframe.
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The core does not use any data RAM allocated over this requirement, and when
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data RAM allocated is less than this requirement, the core can
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malfunction.// <em class="+ topic/ph hi-d/i ph i">Periodic Transmit FIFO</em>
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RAM 大小必须等于在单个微帧中可以传输的最大数据量。核心不使用任何分配给这个需求的数据 RAM，当分配的数据 RAM 小于这个需求时，核心可能会发生故障。The
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minimum amount of RAM required for the Non-periodic Transmit FIFO is the
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largest maximum packet size among all supported non-periodic IN endpoints.//
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<em class="+ topic/ph hi-d/i ph i">Non-periodic Transmit FIFO</em> 最小 RAM 数量是所有支持的非周期 IN 端点中最大的包大小。More space
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allocated in the Transmit Non-periodic FIFO results in better performance on
|
||
the USB and can hide AHB latencies. Typically, two Largest Packet Sizes’
|
||
worth of space is recommended, so that when the current packet is under
|
||
transfer to the USB, the AHB can get the next packet. If the AHB latency is
|
||
large, then you must allocate enough space to buffer multiple packets.//
|
||
<em class="+ topic/ph hi-d/i ph i">Transmit Non-periodic FIFO</em>
|
||
中分配更多的空间，可以在 USB 上获得更好的性能，并可以隐藏 AHB 延迟。通常，建议使用两个最大包大小的空间，以便当当前包正在传输到 USB 时，AHB 可以获得下一个包。如果 AHB 延迟较大，则必须分配足够的空间来缓冲多个包。It
|
||
is assumed that i number of periodic FIFOs is implemented in Device mode.//
|
||
<em class="+ topic/ph hi-d/i ph i">i</em> 是 <em class="+ topic/ph hi-d/i ph i">periodic FIFOs</em> 的个数。计算公式：Non-Periodic TxFIFO =
|
||
<em class="+ topic/ph hi-d/i ph i">largest non-periodic USB packet used / 4</em>Periodic
|
||
Endpoint-Specific TxFIFOs= <em class="+ topic/ph hi-d/i ph i">largest periodic USB packet used for an
|
||
endpoint / 4</em></blockquote>
|
||
</li></ul>
|
||
<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_upf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_upf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e299__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e301__20250121171809">Internal Register Storage Space Allocation</p>
|
||
<blockquote class="- topic/lq lq" id="usb_aic_usb_device_controller__lq_vpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__lq_vpf_2qz_21c">When operating in Internal DMA mode, the core stores the
|
||
Endpoint DMA address register (DI/OEPDMA) in the SPRAM. One location must be
|
||
allocated for each endpoint.//
|
||
当在内部 DMA 模式下运行时，核心将端点 DMA 地址寄存器(DI/OEPDMA)存储在 SPRAM 中。必须为每个端点分配一个位置。For example,
|
||
if an endpoint is bidirectional, then two locations must be allocated. If an
|
||
endpoint is IN or OUT, then only one location must be allocated.//
|
||
例如，如果一个端点是双向的，那么必须分配两个位置。如果端点是 IN 或 OUT，则必须只分配一个位置。</blockquote>
|
||
</li></ul>
|
||
<p class="- topic/p p" data-ofbid="d304171e308__20250121171809"><strong class="+ topic/ph hi-d/b ph b">Example</strong></p>
|
||
<p class="- topic/p p" data-ofbid="d304171e312__20250121171809">The MPS is 1,024 bytes for a <code class="+ topic/ph pr-d/codeph ph codeph">periodic USB packet</code> and 512 bytes for a
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">non-periodic USB packet</code>. There are three <code class="+ topic/ph pr-d/codeph ph codeph">OUT
|
||
endpoints</code>, three <code class="+ topic/ph pr-d/codeph ph codeph">IN endpoints</code>, one <code class="+ topic/ph pr-d/codeph ph codeph">control
|
||
endpoint</code>.</p>
|
||
<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_aic_usb_device_controller__pre_wpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__pre_wpf_2qz_21c">DeviceRxFIFO=(<span class="hl-number">5</span>*<span class="hl-number">1</span>+<span class="hl-number">8</span>)+((<span class="hl-number">1</span>,<span class="hl-number">024</span>/<span class="hl-number">4</span>)+<span class="hl-number">1</span>)+(<span class="hl-number">2</span>*<span class="hl-number">4</span>)+<span class="hl-number">1</span>=<span class="hl-number">279</span>Non-PeriodicTxFIFO=(<span class="hl-number">512</span>/<span class="hl-number">4</span>)=<span class="hl-number">128</span>DevicePeriodicTxFIFO:EP1=(<span class="hl-number">1</span>,<span class="hl-number">024</span>/<span class="hl-number">4</span>)=<span class="hl-number">256E</span>P2=(<span class="hl-number">1</span>,<span class="hl-number">024</span>/<span class="hl-number">4</span>)=<span class="hl-number">256E</span>P3=(<span class="hl-number">1</span>,<span class="hl-number">024</span>/<span class="hl-number">4</span>)=<span class="hl-number">256</span></pre>
|
||
<p class="- topic/p p" data-ofbid="d304171e334__20250121171809"><strong class="+ topic/ph hi-d/b ph b">当前 UDC</strong></p>
|
||
<div class="- topic/p p" data-ofbid="d304171e338__20250121171809">The MPS is 1,024 bytes for a <code class="+ topic/ph pr-d/codeph ph codeph">periodic USB packet</code> and 1024 bytes for
|
||
a <code class="+ topic/ph pr-d/codeph ph codeph">non-periodic USB packet</code>. There are 4 <code class="+ topic/ph pr-d/codeph ph codeph">OUT
|
||
endpoints</code>, 4 <code class="+ topic/ph pr-d/codeph ph codeph">IN endpoints</code>, 1 <code class="+ topic/ph pr-d/codeph ph codeph">control
|
||
endpoint</code>.<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_aic_usb_device_controller__codeblock_hl1_kqz_21c" data-ofbid="usb_aic_usb_device_controller__codeblock_hl1_kqz_21c">Device RxFIFO = (<span class="hl-number">5</span> * <span class="hl-number">1</span> + <span class="hl-number">8</span>) + ((<span class="hl-number">1</span>,<span class="hl-number">024</span> / <span class="hl-number">4</span>) +<span class="hl-number">1</span>) + (<span class="hl-number">2</span> * <span class="hl-number">5</span>) + <span class="hl-number">1</span> = <span class="hl-number">281</span> = <span class="hl-number">0x119</span>
|
||
Non-Periodic TxFIFO = (<span class="hl-number">1024</span> / <span class="hl-number">4</span>) = <span class="hl-number">256</span> = <span class="hl-number">0x100</span>
|
||
Device Periodic TxFIFO:
|
||
EP <span class="hl-number">1</span> = (<span class="hl-number">1</span>,<span class="hl-number">024</span> / <span class="hl-number">4</span>) = <span class="hl-number">256</span> = <span class="hl-number">0x100</span>
|
||
EP <span class="hl-number">2</span> = remain space = <span class="hl-number">0x3F6</span> - <span class="hl-number">0x119</span> - <span class="hl-number">0x100</span> - <span class="hl-number">0x100</span> = <span class="hl-number">0xDD</span>
|
||
Internal Register Storage Space = <span class="hl-number">5</span> * <span class="hl-number">2</span> = <span class="hl-number">10</span> = <span class="hl-number">0xA</span></pre></div>
|
||
<div class="- topic/p p" data-ofbid="d304171e359__20250121171809">或者：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="usb_aic_usb_device_controller__codeblock_j52_kqz_21c" data-ofbid="usb_aic_usb_device_controller__codeblock_j52_kqz_21c">Device RxFIFO = (<span class="hl-number">5</span> * <span class="hl-number">1</span> + <span class="hl-number">8</span>) + ((<span class="hl-number">1</span>,<span class="hl-number">024</span> / <span class="hl-number">4</span>) +<span class="hl-number">1</span>) + (<span class="hl-number">2</span> * <span class="hl-number">5</span>) + <span class="hl-number">1</span> = <span class="hl-number">281</span> = <span class="hl-number">0x119</span>
|
||
Non-Periodic TxFIFO = (<span class="hl-number">1024</span> / <span class="hl-number">4</span>) = <span class="hl-number">256</span> = <span class="hl-number">0x200</span>
|
||
Device Periodic TxFIFO:
|
||
EP <span class="hl-number">1</span> = (<span class="hl-number">0x3F6</span> - <span class="hl-number">0x119</span> - <span class="hl-number">0x200</span>) / <span class="hl-number">2</span> = <span class="hl-number">0x6E</span>
|
||
EP <span class="hl-number">2</span> = (<span class="hl-number">0x3F6</span> - <span class="hl-number">0x119</span> - <span class="hl-number">0x200</span>) / <span class="hl-number">2</span> = <span class="hl-number">0x6E</span>
|
||
Internal Register Storage Space = <span class="hl-number">5</span> * <span class="hl-number">2</span> = <span class="hl-number">10</span> = <span class="hl-number">0xA</span></pre></div>
|
||
</section><section class="- topic/section section" id="usb_aic_usb_device_controller__section_zpf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_zpf_2qz_21c"><h2 class="- topic/title title sectiontitle">FIFO Mapping</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d304171e369__20250121171809"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_usb_device_controller__image_aqf_2qz_21c" src="../../../images/usb/usb_udc_fifo_mapping.png" alt="image4"/></div><br/></div>
|
||
<p class="- topic/p p" data-ofbid="d304171e374__20250121171809">由上几节可知对一个端点 Endpoint 来说，它对应的 FIFO 是动态分配的。在 DMA 模式下，一旦初始化时配置完成就不用再去管 Endpoint FIFO
|
||
的地址。但是对 Slave 模式来说，在数据收发过程中需要 CPU 访问对应 FIFO 空间。</p>
|
||
<p class="- topic/p p" data-ofbid="d304171e377__20250121171809">为了方便 CPU 对 Endpoint FIFO 的访问，UDC 把 Endpoint FIFO 映射到了固定地址。其中读操作会映射到 OUT Endpoint
|
||
FIFO，写操作会映射到 IN Endpoint FIFO。</p>
|
||
</section><section class="- topic/section section" id="usb_aic_usb_device_controller__section_bqf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_bqf_2qz_21c"><h2 class="- topic/title title sectiontitle">Interrupt Cascade</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d304171e385__20250121171809"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_usb_device_controller__image_cqf_2qz_21c" src="../../../images/usb/usb_udc_interrupt.png" alt="image5"/></div><br/></div>
|
||
<p class="- topic/p p" data-ofbid="d304171e390__20250121171809">由于 UDC 的中断状态较多，所以分成 3 级级联：</p>
|
||
<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_dqf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_dqf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e394__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e396__20250121171809">layer1: <code class="+ topic/ph pr-d/codeph ph codeph">GINTSTS</code> & <code class="+ topic/ph pr-d/codeph ph codeph">GINTMSK</code> 。全局中断，每一 bit
|
||
表示一个全局中断状态。其中： <code class="+ topic/ph pr-d/codeph ph codeph">OEPInt</code> 表示有 <code class="+ topic/ph pr-d/codeph ph codeph">Out Endpoint</code>
|
||
中断发生 ， <code class="+ topic/ph pr-d/codeph ph codeph">IEPInt</code> 表示有 <code class="+ topic/ph pr-d/codeph ph codeph">In Endpoint</code> 中断发生。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d304171e418__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e420__20250121171809">layer2: <code class="+ topic/ph pr-d/codeph ph codeph">DAINT</code> & <code class="+ topic/ph pr-d/codeph ph codeph">DAINTMSK</code> 。Endpoint
|
||
中断，每一 bit 表示一个 Endpoint 发生了中断。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d304171e429__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e431__20250121171809">layer3: <code class="+ topic/ph pr-d/codeph ph codeph">DOEPINTn</code> & <code class="+ topic/ph pr-d/codeph ph codeph">DOEPMSK</code> ，
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">DIEPINTn</code> & <code class="+ topic/ph pr-d/codeph ph codeph">DIEPMSK</code> 。Endpoint
|
||
中断细节，每一个 Endpoint 拥有一组这样的寄存器。 寄存器中的每一 bit 代表某个 Endpoint 的某种中断状态。</p>
|
||
</li></ul>
|
||
</section><section class="- topic/section section" id="usb_aic_usb_device_controller__section_eqf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__section_eqf_2qz_21c"><h2 class="- topic/title title sectiontitle">Data Transfer</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d304171e452__20250121171809"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="usb_aic_usb_device_controller__image_fqf_2qz_21c" src="../../../images/usb/usb_udc_trandfer.png" alt="image6"/></div><br/></div>
|
||
<p class="- topic/p p" data-ofbid="d304171e457__20250121171809">UDC 内部的数据收发流程如上图所示。主要的工作就是根据 USB 接收到的读写指令，把数据在 FIFO 和 Memory 之间进行搬移。具体分为几种情况：</p>
|
||
<ul class="- topic/ul ul" id="usb_aic_usb_device_controller__ul_gqf_2qz_21c" data-ofbid="usb_aic_usb_device_controller__ul_gqf_2qz_21c"><li class="- topic/li li" data-ofbid="d304171e461__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e463__20250121171809">OUT Endpoint。所有 OUT Endpoint 的线路数据会接收到一个统一的 <code class="+ topic/ph pr-d/codeph ph codeph">Rx FIFO</code>
|
||
当中，然后根据接收数据的具体 Endpoint 配置的 Memory 地址和长度，DMA 把数据从 FIFO 搬移到对应 Memory
|
||
当中，最后产生中断。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d304171e469__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e471__20250121171809">IN Non-period Endpoint。所有 IN Non-period Endpoint 共享一个统一的 <code class="+ topic/ph pr-d/codeph ph codeph">Tx
|
||
Non-period FIFO</code> ，根据 Endpoint 配置的 Memory 地址和长度，DMA 把数据从 Memory
|
||
搬移到统一的 FIFO 当中，发送到线路上后产生中断。IN Non-period Endpoint 需要配置 <code class="+ topic/ph pr-d/codeph ph codeph">Next
|
||
Endpoint</code> 指针，这样 DMA 处理完一个 Endpoint 的数据后才知道下一个需要处理的 Endpoint。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d304171e480__20250121171809">
|
||
<p class="- topic/p p" data-ofbid="d304171e482__20250121171809">IN Period Endpoint。每一个 IN Period Endpoint 拥有自己独立的 FIFO，根据 Endpoint 配置的 Memory
|
||
地址和长度，DMA 把数据从 Memory 搬移到对应的 FIFO 当中，发送到线路上后产生中断。</p>
|
||
</li></ul>
|
||
</section></div></article></main></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="#usb_aic_usb_device_controller__section_epf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_epf_2qz_21c">Data Mode</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_usb_device_controller__section_kpf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_kpf_2qz_21c">Endpoint FIFO Mode</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_usb_device_controller__section_mpf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_mpf_2qz_21c">Endpoint Resource</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_usb_device_controller__section_npf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_npf_2qz_21c">Calculating FIFO Size</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_usb_device_controller__section_zpf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_zpf_2qz_21c">FIFO Mapping</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_usb_device_controller__section_bqf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_bqf_2qz_21c">Interrupt Cascade</a></div></li><li class="section-item"><div class="section-title"><a href="#usb_aic_usb_device_controller__section_eqf_2qz_21c" data-tocid="usb_aic_usb_device_controller__section_eqf_2qz_21c">Data Transfer</a></div></li></ul></div>
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