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README
Apache-2.0

CherryUSB

English

CherryUSB 是一个小而美的、可移植性高的、用于嵌入式系统(带 USB IP)的 USB 主从协议栈。

CherryUSB

为什么选择

易于学习 USB

为了方便用户学习 USB 基本知识、枚举、驱动加载、IP 驱动,因此,编写的代码具备以下优点:

  • 代码精简,逻辑简单,无复杂 C 语言语法
  • 树状化编程,代码层层递进
  • Class 驱动和 porting 驱动模板化、精简化
  • API 分类清晰(从机:初始化、注册类、命令回调类、数据收发类;主机:初始化、查找类、数据收发类)

易于使用 USB

为了方便用户使用 USB 接口,考虑到用户学习过 uart 和 dma,因此,设计的数据收发类接口具备以下优点:

  • 等价于使用 uart tx dma/uart rx dma
  • 收发长度没有限制,用户不需要关心 USB 分包过程(porting 驱动做分包过程)

易于发挥 USB 性能

考虑到 USB 性能问题,尽量达到 USB 硬件理论带宽,因此,设计的数据收发类接口具备以下优点:

  • Porting 驱动直接对接寄存器,无抽象层封装
  • Memory zero copy
  • IP 如果带 DMA 则使用 DMA 模式(DMA 带硬件分包功能)
  • 长度无限制,方便对接硬件 DMA 并且发挥 DMA 的优势
  • 分包功能在中断中处理

目录结构

.
├── class
├── common
├── core
├── demo
├── docs
├── osal
└── port
└── tools
目录名 描述
class usb class 类主从驱动
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
port usb 主从需要实现的 porting 接口
tools 工具链接

Device 协议栈简介

CherryUSB Device 协议栈对标准设备请求、CLASS 请求、VENDOR 请求以及 custom 特殊请求规范了一套统一的函数框架,采用面向对象和链表的方式,能够使得用户快速上手复合设备,不用管底层的逻辑。同时,规范了一套标准的 dcd porting 接口,用于适配不同的 USB IP,达到面向 ip 编程。

CherryUSB Device 协议栈当前实现以下功能:

  • 支持 USB2.0 全速和高速设备,USB3.0 超速设备
  • 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 Device Class (CDC)
  • 支持 Human Interface Device (HID)
  • 支持 Mass Storage Class (MSC)
  • 支持 USB VIDEO CLASS (UVC1.0、UVC1.5)
  • 支持 USB AUDIO CLASS (UAC1.0、UAC2.0)
  • 支持 Device Firmware Upgrade CLASS (DFU)
  • 支持 USB MIDI CLASS (MIDI)
  • 支持 Remote NDIS (RNDIS)
  • 支持 WINUSB1.0、WINUSB2.0(带 BOS )
  • 支持 Vendor 类 class

CherryUSB Device 协议栈资源占用说明(GCC 10.2 with -O2):

file FLASH (Byte) No Cache RAM (Byte) RAM (Byte) Heap (Byte)
usbd_core.c 3516 256(default) + 320 0 0
usbd_cdc.c 392 0 0 0
usbd_msc.c 2839 128 + 512(default) 16 0
usbd_hid.c 364 0 0 0
usbd_audio.c 1455 0 0 0
usbd_video.c 2494 0 84 0
usbd_rndis.c 2109 3340 76 0

Host 协议栈简介

CherryUSB 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。

CherryUSB 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
  • 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)
  • Support USB Video CLASS
  • Support USB Audio CLASS
  • 支持 Remote NDIS (RNDIS)
  • 支持 Vendor 类 class

同时,CherryUSB 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。

CherryUSB Host 协议栈资源占用说明(GCC 10.2 with -O2):

file FLASH (Byte) No Cache RAM (Byte) RAM (Byte) Heap (Byte)
usbh_core.c 4237 512 + 8 * (1+x) *n 28 sizeof(struct usbh_urb)
usbh_hub.c 2919 32 + 4* (1+x) 12 + sizeof(struct usbh_hub) * (1+x) 0
usbh_cdc_acm.c 1099 7 4 + sizeof(struct usbh_cdc_acm) * x 0
usbh_msc.c 2502 32 4 + sizeof(struct usbh_msc) * x 0
usbh_hid.c 956 128 4 + sizeof(struct usbh_hid) * x 0
usbh_video.c 2330 128 4 + sizeof(struct usbh_video) * x 0
usbh_audio.c 3168 128 4 + sizeof(struct usbh_audio) * x 0
usbh_rndis.c 3030 4096 4 + sizeof(struct usbh_rndis) * x 0

其中,sizeof(struct usbh_hub)sizeof(struct usbh_hubport) 受以下宏影响:

#define CONFIG_USBHOST_MAX_EXTHUBS          1
#define CONFIG_USBHOST_MAX_EHPORTS          4
#define CONFIG_USBHOST_MAX_INTERFACES       6
#define CONFIG_USBHOST_MAX_INTF_ALTSETTINGS 1
#define CONFIG_USBHOST_MAX_ENDPOINTS        4

x 受以下宏影响:

#define CONFIG_USBHOST_MAX_CDC_ACM_CLASS 4
#define CONFIG_USBHOST_MAX_HID_CLASS     4
#define CONFIG_USBHOST_MAX_MSC_CLASS     2
#define CONFIG_USBHOST_MAX_AUDIO_CLASS   1
#define CONFIG_USBHOST_MAX_VIDEO_CLASS   1
#define CONFIG_USBHOST_MAX_RNDIS_CLASS   1

文档教程

CherryUSB 快速入门、USB 基本概念,API 手册,Class 基本概念和例程,参考 CherryUSB 文档教程

视频教程

USB 基本知识点与 CherryUSB Device 协议栈是如何编写的,参考 CherryUSB Device 协议栈教程.

图形化界面配置工具

chryusb_configurator 采用 electron + vite2 + ts 框架编写,当前用于自动化生成描述符数组,后续会增加其他功能。

示例仓库

厂商 芯片或者系列 USB IP 仓库链接 对应 master 版本
Bouffalolab BL702/BL616/BL808 bouffalolab/ehci bouffalo_sdk v0.9.0
ST STM32F1x fsdev stm32_repo latest
ST STM32F4/STM32H7 dwc2 stm32_repo latest
HPMicro HPM6750 hpm/ehci hpm_sdk v0.8.0
Essemi ES32F36xx musb es32f369_repo latest
AllwinnerTech F1C100S/F1C200S musb cherryusb_rtt_f1c100s latest
Phytium e2000 xhci phytium_repo v0.9.0
Raspberry pi rp2040 rp2040 pico-examples latest
WCH CH32V307/ch58x ch32_usbfs/ch32_usbhs/ch58x wch_repo latest
Nordicsemi Nrf52840 nrf5x nrf5x_repo latest
Espressif esp32s3 dwc2 esp32_repo latest
Bekencorp BK72xx musb armino v0.7.0
Sophgo cv18xx dwc2 cvi_alios_open v0.7.0
Nuvoton Nuc442 nuvoton nuc442_repo v0.4.1
Geehy APM32E10x APM32F0xx fsdev apm32_repo v0.4.1

Contact

QQ 群:642693751

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