-
4.3 Transfer Descriptors
A Transfer Descriptor (TD) is a system memory data structure that is used by the Host Controller to define a buffer of data that will be moved to or from an endpoint. TDs come in ... -
302 044.准备一个效果
笔记 源码 App.vue components\Count.vue components\LoveTalk.vue 笔记 准备的效果图: 为了配合源码熟悉解析请求服务器(https://api.uomg.com/api/rand.qinghua?format=json)返回数据的写法，我把视频中返回的数据结构截图如下 : 2025-1... -
简介
HccaDoneHead的完整定义 1. 字面含义解析 2. 在HCCA结构中的位置 HCCA内存布局 （第4.4.2节） 3. 数据结构本质 物理地址指针 链表结构 4. 工作原理：生产者-消费者模型 OHCI硬件作为生产者 HCD驱动作为消费者 5. 队列构建示例 TD完成的时间线 内存中的实际布局 6.... -
6.2.2.1 Items Types and Tags
All items contain a 1-byte prefix which denotes the basic type of the item. The HID class defines two basic formats for items: 所有项都包含一个1字节的前缀 ，用于标识该项的基本类型。HID 类为项定义两种基本格式： S... -
6.2.2.6 Collection, End Collection Items
描述 格式 注释 描述 A Collection item identifies a relationship between two or more data (Input, Output, or Feature.) For example, a mouse could be described as a collection of two t... -
3.1 Introduction
Figure 3-1 shows four main focus areas of a Universal Serial Bus (USB) system. These areas are the Client Software/USB Driver, Host Controller Driver (HCD), Host Controller (HC), ...