wen/luban-lite-t3e-pro
1
0
Fork 0
mirror of https://gitee.com/Vancouver2017/luban-lite-t3e-pro.git synced 2025-12-14 18:38:55 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
b4033d8696b77dddcafce4e00eaaf2a01ccc38fb
luban-lite-t3e-pro/doc/topics/sdk/usb/usb-aic_usb_device_controller.html

353 lines
39 KiB
HTML
Raw Normal View History

add doc v1.1.2
2025-01-23 16:37:00 +08:00
<!DOCTYPE html><html xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh-cn" lang="zh-cn" data-whc_version="26.0">
<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="ArtInChip UDC 在硬件层面实现了以下功能： Data Mode UDC 实现的一项主要工作是数据搬移： 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。 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。 对于 FIFO ..."/><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="2024-02-04"/><meta name="DC.format" content="HTML5"/><meta name="DC.identifier" content="usb_aic_usb_device_controller"/><meta name="DC.language" content="zh-CN"/><title>AIC USB Device Controller</title><!-- Build number 2023110923. --><meta name="wh-path2root" content="../../../"/><meta name="wh-toc-id" content=""/><meta name="wh-source-relpath" content="topics/sdk/usb/usb-aic_usb_device_controller.dita"/><meta name="wh-out-relpath" content="topics/sdk/usb/usb-aic_usb_device_controller.html"/>
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/commons.css?buildId=2023110923"/>
<link rel="stylesheet" type="text/css" href="../../../webhelp/app/topic.css?buildId=2023110923"/>
<script src="../../../webhelp/app/options/properties.js?buildId=20250121171154"></script>
<script src="../../../webhelp/app/localization/strings.js?buildId=2023110923"></script>
<script src="../../../webhelp/app/search/index/keywords.js?buildId=20250121171154"></script>
<script defer="defer" src="../../../webhelp/app/commons.js?buildId=2023110923"></script>
<script defer="defer" src="../../../webhelp/app/topic.js?buildId=2023110923"></script>
<link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-styles-web.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/notes.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-common.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-images.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/footnote.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/aic-web-watermark.css?buildId=2023110923"/><link rel="stylesheet" type="text/css" href="../../../webhelp/template/topic-body-list.css?buildId=2023110923"/></head>
<body id="usb_aic_usb_device_controller" class="wh_topic_page frmBody">
<a href="#wh_topic_body" class="sr-only sr-only-focusable">
跳转到主要内容
</a>
<header class="navbar navbar-default wh_header">
<div class="container-fluid">
<div class="wh_header_flex_container navbar-nav navbar-expand-md navbar-dark">
<div class="wh_logo_and_publication_title_container">
<div class="wh_logo_and_publication_title">
<a href="http://www.artinchip.com" class=" wh_logo d-none d-sm-block "><img src="../../../company-logo-white.png" alt="RTOS SDK 使用指南SDK 指南文件"/></a>
<div class=" wh_publication_title "><a href="../../../index.html"><span class="booktitle"><span class="ph mainbooktitle">RTOS SDK 使用指南</span><span class="ph booktitlealt">SDK 指南文件</span></span></a></div>
</div>
</div>
<div class="wh_top_menu_and_indexterms_link collapse navbar-collapse" id="wh_top_menu_and_indexterms_link">
</div>
</div>
</div>
</header>
<div class=" wh_search_input navbar-form wh_topic_page_search search " role="form">
<form id="searchForm" method="get" role="search" action="../../../search.html"><div><input type="search" placeholder="搜索 " class="wh_search_textfield" id="textToSearch" name="searchQuery" aria-label="搜索查询" required="required"/><button type="submit" class="wh_search_button" aria-label="搜索"><span class="search_input_text">搜索</span></button></div></form>
</div>
<div class="container-fluid" id="wh_topic_container">
<div class="row">
<nav class="wh_tools d-print-none navbar-expand-md" aria-label="Tools">
<div data-tooltip-position="bottom" class=" wh_breadcrumb "></div>
<div class="wh_right_tools">
<button class="wh_hide_highlight" aria-label="切换搜索突出显示" title="切换搜索突出显示"></button>
<button class="webhelp_expand_collapse_sections" data-next-state="collapsed" aria-label="折叠截面" title="折叠截面"></button>
<div class=" wh_print_link print d-none d-md-inline-block "><button onClick="window.print()" title="打印此页" aria-label="打印此页"></button></div>
</div>
</nav>
</div>
<div class="wh_content_area">
<div class="row">
<div class="col-lg-10 col-md-10 col-sm-10 col-xs-12" id="wh_topic_body">
<button id="wh_close_topic_toc_button" class="close-toc-button d-none" aria-label="Toggle topic table of content" aria-controls="wh_topic_toc" aria-expanded="true">
<span class="close-toc-icon-container">
<span class="close-toc-icon"></span>
</span>
</button>
<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;">
Read time: 12 minute(s)
</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>
<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>
<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">
<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>
</li><li class="- topic/li li" data-ofbid="d304171e38__20250121171809">
<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>
</li></ul>
<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>
<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
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
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="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>
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="d304171e94__20250121171809">
<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
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="d304171e114__20250121171809">
<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
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="d304171e134__20250121171809">
<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>
</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="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
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="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
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="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>
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="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>
<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>
<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">
<p class="- topic/p p" data-ofbid="d304171e197__20250121171809">OUT endpoints RxFIFO</p>
</li><li class="- topic/li li" data-ofbid="d304171e200__20250121171809">
<p class="- topic/p p" data-ofbid="d304171e202__20250121171809">IN non-periodic endpoints TxFIFO</p>
</li><li class="- topic/li li" data-ofbid="d304171e205__20250121171809">
<p class="- topic/p p" data-ofbid="d304171e207__20250121171809">IN periodic endpoints TxFIFO</p>
</li><li class="- topic/li li" data-ofbid="d304171e210__20250121171809">
<p class="- topic/p p" data-ofbid="d304171e212__20250121171809">DMA</p>
</li></ul>
<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>
<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">
<p class="- topic/p p" data-ofbid="d304171e223__20250121171809">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="d304171e268__20250121171809">
<p class="- topic/p p" data-ofbid="d304171e270__20250121171809">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="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> &amp; <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> &amp; <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> &amp; <code class="+ topic/ph pr-d/codeph ph codeph">DOEPMSK</code> ，
<code class="+ topic/ph pr-d/codeph ph codeph">DIEPINTn</code> &amp; <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>
</div>
<nav role="navigation" id="wh_topic_toc" aria-label="On this page" class="col-lg-2 d-none d-lg-block navbar d-print-none">
<div id="wh_topic_toc_content">
<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>
</div>
</nav>
</div>
</div>
</div>
<footer class="navbar navbar-default wh_footer">
<div class=" footer-container mx-auto ">
<title>footer def</title>
<style><!--
.p1 {
font-family: FangZhengShuSong, Times, serif;
}
.p2 {
font-family: Arial, Helvetica, sans-serif;
}
.p3 {
font-family: "Lucida Console", "Courier New", monospace;
}
--></style>
<div class="webhelp.fragment.footer">
<p class="p1">Copyright © 2019-2024 广东匠芯创科技有限公司. All rights reserved.</p>
</div><div>
<div class="generation_time">
Update Time: 2025-01-21
</div>
</div>
</div>
</footer>
<div id="go2top" class="d-print-none">
<span class="oxy-icon oxy-icon-up"></span>
</div>
<div id="modal_img_large" class="modal">
<span class="close oxy-icon oxy-icon-remove"></span>
<div id="modal_img_container"></div>
<div id="caption"></div>
</div>
<script src="${pd}/publishing/publishing-styles-AIC-template/js/custom.js" defer="defer"></script>
</body>
</html>
Reference in New Issue Copy Permalink