update host stack readme

README.md

@@ -32,6 +32,7 @@ USB Stack is a tiny, beautiful and portable USB host and device stack for embedd
     ├── bouffalolab
     │   └── bl702
     ├── ch32
+    ├── ehci
     ├── fsdev
     ├── mm32
     ├── synopsys
@@ -60,8 +61,8 @@ USB Device Stack has the following functions：
 
 - Support USB2.0 full and high speed
 - Support endpoint irq callback register by users, let users do whatever they wants in endpoint irq callback.
-- Support Composite class
-- Support Communication Class (CDC)
+- Support Compound and Composite Device
+- Support Communication Device Class (CDC)
 - Support Human Interface Device (HID)
 - Support Custom human Interface Device (HID)
 - Support Mass Storage Class (MSC)
@@ -86,7 +87,25 @@ USB Device Stack resource usage：
 
 ## USB Host Stack Overview
 
-waiting....
+The USB Host Stack has a standard enumeration implementation for devices mounted on roothubs and external hubs, and a standard interface for the different Class to indicate what the Class driver needs to do after enumeration and after disconnection. A standard hcd porting interface has also been standardised for adapting different USB IPs for IP-oriented programming. Finally, the protocol stack is managed using os, and provides osal to make a adaptation to different os.
+
+How USB Host Stack is implemented, the video will be provided in future.
+
+USB Host Stack has the following functions：
+
+- Automatic loading of supported Class drivers
+- Support blocking transfers and asynchronous transfers
+- Support Compound and Composite Device
+- Multi-level HUB support, expandable up to 7 levels
+- Support Communication Device Class (CDC)
+- Support Human Interface Device (HID)
+- Support Mass Storage Class (MSC)
+- Support Vendor class
+- Support Andriod AOA Communication
+
+The USB Host stack also provides the lsusb function, which allows you to view information about all mounted devices, including those on external hubs, with the help of a shell plugin.
+
+![lsusb](docs/img/lsusb.png)
 
 ## USB Device API
 

README_zh.md

@@ -32,6 +32,7 @@ USB Stack 是一个小而美的、可移植性高的、用于嵌入式系统的
     ├── bouffalolab
     │   └── bl702
     ├── ch32
+    ├── ehci
     ├── fsdev
     ├── mm32
     ├── synopsys
@@ -42,8 +43,8 @@ USB Stack 是一个小而美的、可移植性高的、用于嵌入式系统的
 |   目录名       |  描述                          |
 |:-------------:|:------------------------------:|
 |class          |  usb class 类主从驱动           |
-|common         |  usb spec 定义和一些常用函数     |
-|core           |  usb 主从核心实现               |
+|common         |  usb spec 定义、常用宏、标准接口定义 |
+|core           |  usb 主从协议栈核心实现            |
 |demo           |  示例                          |
 |docs           |  文档                          |
 |osal           |  os 封装层                       |
@@ -60,8 +61,8 @@ USB Device 协议栈当前实现以下功能：
 
 - 支持 USB2.0 全速和高速设备
 - 支持端点中断注册功能，porting 给用户自己处理中断里的数据
-- 支持复合设备
-- 支持 Communication Class (CDC)
+- 支持复合设备和组合设备
+- 支持 Communication Device Class (CDC)
 - 支持 Human Interface Device (HID)
 - 支持 Custom human Interface Device (HID)
 - 支持 Mass Storage Class (MSC)
@@ -86,7 +87,24 @@ USB Device 协议栈资源占用说明：
 
 ## USB Host 协议栈简介
 
-waiting....
+USB Host 协议栈对挂载在 roothub、外部 hub 上的设备规范了一套标准的枚举实现，对不同的 Class 类也规范了一套标准接口，用来指示在枚举后和断开连接后该 Class 驱动需要做的事情。同时，规范了一套标准的 hcd porting 接口，用于适配不同的 USB IP，达到面向 IP 编程。最后，协议栈使用 OS 管理，并提供了 osal 用来适配不同的 os。
+
+USB Host 协议栈的代码实现过程参考：视频后续发布。
+
+USB Host 协议栈当前实现以下功能：
+
+- 自动加载支持的Class 驱动
+- 支持阻塞式传输和异步传输
+- 支持复合设备和组合设备
+- 支持多级 HUB,最高可拓展到 7 级
+- 支持 Communication Device Class (CDC)
+- 支持 Human Interface Device (HID)
+- 支持 Mass Storage Class (MSC)
+- 支持安卓 AOA Communication
+
+同时，USB Host 协议栈还提供了 lsusb 的功能，借助 shell 插件可以查看所有挂载设备的信息，包括外部 hub 上的设备的信息。
+
+![lsusb](docs/img/lsusb.png)
 
 ## USB Device API