CherryUSB

CherryUSB

中文版

CherryUSB is a tiny, beautiful and portable USB host and device stack for embedded system with USB ip.

Why choose

• Ip-oriented programming, the same usb ip driver does not need to be written repeatedly, only the parts that are not the same need to be implemented
• Code tree writing makes it easier for users to understand usb concept, enumeration process, class driver loading
• Templating the Class driver makes it easier to use composite device and add custom drivers
• Simplifying the complex transfer of usb makes it easier for users to use usb as easily as uart and dma
• Fewer directory structures, fewer apis, fewer codesize, extreme usb bandwidth

Directoy Structure

.
├── class
├── common
├── core
├── demo
├── docs
├── osal
├── packet capture
└── port
└── tools

Directory	Description
class	usb class driver
common	usb spec macros and utils
core	usb core implementation
demo	different chips demo
osal	os wrapper
docs	doc for guiding
packet capture	packet capture file
port	usb dcd and hcd porting
tools	tool used url

Device Stack Overview

CherryUSB Device Stack provides a unified framework of functions for standard device requests, CLASS requests, VENDOR requests and custom special requests. The object-oriented and chained approach allows the user to quickly get started with composite devices without having to worry about the underlying logic. At the same time, a standard dcd porting interface has been standardised for adapting different USB IPs to achieve ip-oriented programming.

CherryUSB 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 Device
• Support Communication Device Class (CDC)
• Support Human Interface Device (HID)
• Support Custom human Interface Device (HID)
• Support Mass Storage Class (MSC)
• Support USB VIDEO CLASS (UVC1.0、UVC1.5)
• Support USB AUDIO CLASS (UAC1.0、UAC2.0)
• Support Device Firmware Upgrade CLASS (DFU)
• Support USB MIDI CLASS (MIDI)
• Support Test and Measurement CLASS (TMC)
• Support Remote NDIS (RNDIS)
• Support WINUSB1.0、WINUSB2.0(with BOS)
• Support Vendor class

CherryUSB Device Stack resource usage (GCC 10.2 with -O2)：

file	FLASH (Byte)	RAM (Byte)
usbd_core.c	3045	373
usbd_cdc.c	302	20
usbd_msc.c	2452	132
usbd_hid.c	784	201
usbd_audio.c	438	14
usbd_video.c	402	4

Host Stack Overview

The CherryUSB 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.

CherryUSB Host Stack has the following functions：

• Automatic loading of supported Class drivers
• Support blocking transfers and asynchronous transfers
• Support 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 Remote NDIS (RNDIS)
• Support Vendor class

The CherryUSB 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.

Documentation Tutorial

Quickly start, USB basic concepts, API manual, Class basic concepts and examples, see CherryUSB Documentation Tutorial

Video Tutorial

USB basic concepts and how the CherryUSB Device stack is implemented, see CherryUSB Device Stack Tutorial.

Graphical Config Tool

chryusb_configurator is written in electron + vite2 + ts framework，currently used to automate the generation of descriptor arrays, with additional functionality to be added later.

Demo Repo

Manufacturer	CHIP or Series	USB IP	Repo Url
Bouffalolab	BL702	bouffalolab	bl_mcu_sdk
Essemi	ES32F36xx	musb	es32f369_repo
AllwinnerTech	F1C100S	musb	cherryusb_rtt_f1c100s
ST	STM32F103C8T6	fsdev	stm32f103_repo
ST	STM32F429IGT6	synopsys/dwc2	stm32f429_device_repo stm32f429_host_repo
WCH	CH32V307	ch32_usbfs	ch32v307_repo
WCH	CH57x	ch58x	ch57x_repo
Nuvoton	Nuc442	nuvoton	nuc442_repo
Nordicsemi	Nrf52840	nrf5x	nrf5x_repo
Geehy	APM32E10x APM32F0xx	fsdev	apm32_repo
Mindmotion	MM32L3xx	mm32	mm32_repo