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使用指南</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="false"><div data-tocid="usb_configuration-d4445e7313" class="topicref" data-id="usb_configuration" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_configuration-d4445e7313-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_config.html" id="usb_configuration-d4445e7313-link">USB 配置</a></div></div></li><li role="treeitem"><div data-tocid="usb_debug_guide-d4445e7369" class="topicref" data-id="usb_debug_guide" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-debug_guide.html" id="usb_debug_guide-d4445e7369-link">调试指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_test_guide-d4445e7383" class="topicref" data-id="usb_test_guide" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_test_guide-d4445e7383-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-test_guide.html" id="usb_test_guide-d4445e7383-link">测试指南</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_design_intro-d4445e7468" class="topicref" data-id="usb_design_intro" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_design_intro-d4445e7468-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-design_intro.html" id="usb_design_intro-d4445e7468-link">设计说明</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_host_subsystem_code_structure-d4445e7594" class="topicref" data-id="usb_host_subsystem_code_structure" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_host_subsystem_code_structure-d4445e7594-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-host_subsystem_code_structure.html" id="usb_host_subsystem_code_structure-d4445e7594-link">USB Host 子系统代码架构</a></div></div></li><li role="treeitem" aria-expanded="true"><div data-tocid="usb_device_subsystem_code_structure-d4445e7762" class="topicref" data-id="usb_device_subsystem_code_structure" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action usb_device_subsystem_code_structure-d4445e7762-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-device_subsystem_code_structure.html" id="usb_device_subsystem_code_structure-d4445e7762-link">USB Device 子系统代码架构</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" aria-expanded="true"><div data-tocid="usb_device_controller_layer-d4445e7776" class="topicref" data-id="usb_device_controller_layer" data-state="expanded"><span role="button" tabindex="0" aria-labelledby="button-collapse-action usb_device_controller_layer-d4445e7776-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-device-controller_layer.html" id="usb_device_controller_layer-d4445e7776-link">USB Device Controller Layer</a></div></div><ul role="group" class="navbar-nav nav-list"><li role="treeitem" class="active"><div data-tocid="usb_aic_usb_device_controller-d4445e7790" class="topicref" data-id="usb_aic_usb_device_controller" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-aic_usb_device_controller.html" id="usb_aic_usb_device_controller-d4445e7790-link">AIC USB Device Controller</a></div></div></li><li role="treeitem"><div data-tocid="usb_aic_udc_driver-d4445e7804" class="topicref" data-id="usb_aic_udc_driver" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-aic_udc_driver.html" id="usb_aic_udc_driver-d4445e7804-link">AIC UDC Driver</a></div></div></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_device_device_layer-d4445e7818" class="topicref" data-id="usb_device_device_layer" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_device_device_layer-d4445e7818-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-device-device_layer.html" id="usb_device_device_layer-d4445e7818-link">USB Device Layer</a></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="usb_device_interface_layer-d4445e7888" class="topicref" data-id="usb_device_interface_layer" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action usb_device_interface_layer-d4445e7888-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb-device-interface_layer.html" id="usb_device_interface_layer-d4445e7888-link">USB Interface Layer</a></div></div></li></ul></li><li role="treeitem"><div data-tocid="usb_common_issues-d4445e7930" class="topicref" data-id="usb_common_issues" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/usb/usb_faq.html" id="usb_common_issues-d4445e7930-link">常见问题</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d4445e7944" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d4445e7944-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d4445e7944-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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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" title="Edit this document" 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">15 Jan 2024</div><div style="color: gray;">
|
||
Read time: 12 minute(s)
|
||
</div>
|
||
<div class="- topic/body concept/conbody body conbody">
|
||
<p class="- topic/p p" data-ofbid="d159116e33__20250123155216">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>
|
||
|
||
<p class="- topic/p p" data-ofbid="d159116e41__20250123155216">UDC 实现的一项主要工作是数据搬移：</p>
|
||
<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="d159116e46__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e48__20250123155216">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>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159116e52__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e54__20250123155216">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>
|
||
</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d159116e59__20250123155216">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>
|
||
<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="d159116e70__20250123155216"><p class="- topic/p p" data-ofbid="d159116e71__20250123155216">DMA Mode。</p><div class="- topic/p p" data-ofbid="d159116e73__20250123155216"><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="d159116e79__20250123155216">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
|
||
的其实地址，DMA 会完成数据的搬移。</p></li>
|
||
<li class="- topic/li li" data-ofbid="d159116e82__20250123155216"><p class="- topic/p p" data-ofbid="d159116e83__20250123155216">Slave Mode。</p><div class="- topic/p p" data-ofbid="d159116e85__20250123155216"><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="d159116e91__20250123155216">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
|
||
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>
|
||
</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>
|
||
|
||
<p class="- topic/p p" data-ofbid="d159116e101__20250123155216">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>
|
||
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
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">FIFO</code> 使用模式如下：</p>
|
||
<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="d159116e118__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e120__20250123155216">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
|
||
FIFO</code> 。 <code class="+ topic/ph pr-d/codeph ph codeph">non-periodic endpoints</code> 包括
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">isochronous transfers</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">interrupt
|
||
transfers</code>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159116e139__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e141__20250123155216">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
|
||
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
|
||
transfers</code> 和 <code class="+ topic/ph pr-d/codeph ph codeph">control transfers</code>。</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159116e160__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e162__20250123155216">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>
|
||
</li>
|
||
</ul>
|
||
</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>
|
||
|
||
<p class="- topic/p p" data-ofbid="d159116e179__20250123155216">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
|
||
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>
|
||
<p class="- topic/p p" data-ofbid="d159116e182__20250123155216">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
|
||
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
|
||
<code class="+ topic/ph pr-d/codeph ph codeph">transmit FIFO</code> 资源，供驱动动态分配。</p>
|
||
<p class="- topic/p p" data-ofbid="d159116e197__20250123155216">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>
|
||
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>
|
||
</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>
|
||
|
||
<div class="- topic/p p" data-ofbid="d159116e215__20250123155216"><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>
|
||
<p class="- topic/p p" data-ofbid="d159116e222__20250123155216">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>
|
||
<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="d159116e227__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e229__20250123155216">OUT endpoints RxFIFO</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159116e233__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e235__20250123155216">IN non-periodic endpoints TxFIFO</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159116e239__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e241__20250123155216">IN periodic endpoints TxFIFO</p>
|
||
</li>
|
||
<li class="- topic/li li" data-ofbid="d159116e245__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e247__20250123155216">DMA</p>
|
||
</li>
|
||
</ul>
|
||
<p class="- topic/p p" data-ofbid="d159116e252__20250123155216">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>
|
||
<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="d159116e258__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e260__20250123155216">Receive FIFO RAM allocation</p>
|
||
<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
|
||
Scatter/Gather DMA mode and 5 * n+6 locations in Slave and Buffer DMA mode
|
||
must be reserved in the RxFIFO to receive up to n SETUP packets on control
|
||
endpoints, where n is the number of control endpoints the device core
|
||
supports. The core does not use these locations, which are Reserved for
|
||
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
|
||
+ 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
|
||
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>
|
||
locationStatus information is written to the FIFO along with each received
|
||
packet. Therefore, a minimum space of (Largest Packet Size / 4) + 1 must be
|
||
allotted to receive packets. If a high-bandwidth endpoint is enabled, or
|
||
multiple isochronous endpoints are enabled, then at least two (Largest
|
||
Packet Size / 4) + 1 spaces must be allotted to receive back-to-back
|
||
packets. Typically, two (Largest Packet Size / 4) + 1 spaces are recommended
|
||
so that when the previous packet is being transferred to AHB, the USB can
|
||
receive the subsequent packet. If AHB latency is high, you must allocate
|
||
enough space to receive multiple packets. This is critical to prevent
|
||
dropping of any isochronous packets.// 包接收空间： 最少 <em class="+ topic/ph hi-d/i ph i">(Largest Packet Size /
|
||
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>
|
||
spacesAlong with each endpoint’s last packet, transfer complete status
|
||
information is also pushed to the FIFO. Typically, one location for each OUT
|
||
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
|
||
complete status information</em>An additional endpoint for each EPDisable
|
||
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
|
||
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
|
||
packet used / 4) + 1 for status information)</em> + <em class="+ topic/ph hi-d/i ph i">(2 * number of OUT
|
||
endpoints)</em> + <em class="+ topic/ph hi-d/i ph i">1 for Global NAK</em></blockquote>
|
||
</li>
|
||
</ul>
|
||
<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="d159116e307__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e309__20250123155216">Transmit FIFO RAM allocation</p>
|
||
<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
|
||
the maximum amount of data that can be transmitted in a single microframe.
|
||
The core does not use any data RAM allocated over this requirement, and when
|
||
data RAM allocated is less than this requirement, the core can
|
||
malfunction.// <em class="+ topic/ph hi-d/i ph i">Periodic Transmit FIFO</em>
|
||
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
|
||
minimum amount of RAM required for the Non-periodic Transmit FIFO is the
|
||
largest maximum packet size among all supported non-periodic IN endpoints.//
|
||
<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
|
||
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="d159116e340__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e342__20250123155216">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="d159116e350__20250123155216"><strong class="+ topic/ph hi-d/b ph b">Example</strong></p>
|
||
<p class="- topic/p p" data-ofbid="d159116e354__20250123155216">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"><code>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></code></pre>
|
||
<p class="- topic/p p" data-ofbid="d159116e376__20250123155216"><strong class="+ topic/ph hi-d/b ph b">当前 UDC</strong></p>
|
||
<div class="- topic/p p" data-ofbid="d159116e380__20250123155216">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"><code>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></code></pre></div>
|
||
<div class="- topic/p p" data-ofbid="d159116e401__20250123155216">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"><code>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></code></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="d159116e413__20250123155216"><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="d159116e420__20250123155216">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="d159116e423__20250123155216">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="d159116e432__20250123155216"><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="d159116e439__20250123155216">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="d159116e444__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e446__20250123155216">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="d159116e469__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e471__20250123155216">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="d159116e481__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e483__20250123155216">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="d159116e506__20250123155216"><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="d159116e513__20250123155216">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="d159116e518__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e520__20250123155216">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="d159116e527__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e529__20250123155216">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="d159116e539__20250123155216">
|
||
<p class="- topic/p p" data-ofbid="d159116e541__20250123155216">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>
|
||
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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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