TinyUSB

TinyUSB is an open-source cross-platform USB Host/Device stack for embedded systems. It’s designed for memory safety (no dynamic allocation) and thread safety (all interrupts deferred to non-ISR task functions). The stack emphasizes portability, small footprint, and real-time performance across 50+ MCU families.

Key Features

• Thread-safe: USB interrupts deferred to task context
• Memory-safe: No dynamic allocation, all buffers static
• Portable: Supports 50+ MCU families
• Comprehensive: Includes CDC, HID, MSC, Audio, and Host support
• RTOS-friendly: Works with bare metal, FreeRTOS, RT-Thread, and Mynewt

.
├── docs # Documentation
├── examples # Examples with make and cmake build system
├── hw
│ ├── bsp # Supported boards source files
│ └── mcu # Low level mcu core & peripheral drivers
├── lib # Sources from 3rd party such as FreeRTOS, FatFs ...
├── src # All sources files for TinyUSB stack itself.
├── test # Tests: unit test, fuzzing, hardware test
└── tools # Files used internally

Getting started

See the Getting Started guide for adding TinyUSB to your project or building the examples. If you are new to TinyUSB, we recommend starting with the cdc_msc example. There is a handful of Supported Boards that should work out of the box.

We use raise an issue and follow the templates there.

See Porting guide for adding support for new MCUs and boards.

Device Stack

Supports multiple device configurations by dynamically changing USB descriptors, low power functions such like suspend, resume, and remote wakeup. The following device classes are supported:

• Audio Class 1.0/2.0 (UAC1/UAC2)
• Bluetooth Host Controller Interface (BTH HCI)
• Communication Device Class (CDC)
• Device Firmware Update (DFU): DFU mode (WIP) and Runtime
• Human Interface Device (HID): Generic (In & Out), Keyboard, Mouse, Gamepad etc ...
• Printer class
• Mass Storage Class (MSC): with multiple LUNs
• Musical Instrument Digital Interface (MIDI)
• Media Transfer Protocol (MTP/PTP)
• Network with RNDIS, Ethernet Control Model (ECM), Network Control Model (NCM)
• Test and Measurement Class (USBTMC)
• Video class 1.5 (UVC): work in progress
• Vendor-specific class support with generic In & Out endpoints. Can be used with MS OS 2.0 compatible descriptor to load winUSB driver without INF file.
• raspberrypi/pico-sdk#197

  Host Stack

  • Communication Device Class: CDC-ACM
  • Vendor serial over USB: FTDI, CP210x, CH34x, PL2303
  • Human Interface Device (HID): Keyboard, Mouse, Generic
  • Mass Storage Class (MSC)
  • Musical Instrument Digital Interface (MIDI)
  • Hub with multiple-level support

  Similar to the Device Stack, if you have a special requirement, usbh_app_driver_get_cb() can be used to write your own class driver without modifying the stack.

  Power Delivery Stack

  • Power Delivery 3.0 (PD3.0) with USB Type-C support (WIP)
  • Super early stage, only for testing purpose
  • Only support STM32 G4

  OS Abstraction layer

  TinyUSB is completely thread-safe by pushing all Interrupt Service Request (ISR) events into a central queue, then processing them later in the non-ISR context task function. It also uses semaphore/mutex to access shared resources such as Communication Device Class (CDC) FIFO. Therefore the stack needs to use some of the OS's basic APIs. Following OSes are already supported out of the box.

  • No OS
  • FreeRTOS
  • repo
  • Mynewt Due to the newt package build system, Mynewt examples are better to be on its Supported CPUs

    Manufacturer	Family				Device	Host	Highspeed	Driver	Note
    Allwinner	F1C100s/F1C200s				✔	✔	sunxi	musb variant
    Analog	MAX3421E				✔	✖	max3421	via SPI
    	MAX32 650, 666, 690, MAX78002				✔	✔	musb	1-dir ep
    Artery AT32	F403a_407, F413				✔	fsdev	512 USB RAM
    	F415, F435_437, F423, F425, F45x				✔	✔	dwc2
    	F402_F405				✔	✔	✔	dwc2	F405 is HS
    Bridgetek	FT90x				✔	✔	ft9xx	1-dir ep
    Broadcom	BCM2711, BCM2837				✔	✔	dwc2
    Dialog	DA1469x				✔	✖	✖	da146xx
    Espressif ESP32	S2, S3, H4				✔	✔	✖	dwc2
    	P4				✔	✔	✔	dwc2
    GigaDevice	GD32VF103				✔	✖	dwc2
    HPMicro	HPM6750				✔	✔	✔	ci_hs, ehci
    Infineon	XMC4500				✔	✔	✖	dwc2
    MicroChip	SAM		D11, D21, L21, L22		✔	✖	samd
    			D51, E5x		✔	✖	samd
    			G55		✔	✖	samg	1-dir ep
    			E70,S70,V70,V71		✔	✔	samx7x	1-dir ep
    	PIC		24		✔	pic	ci_fs variant
    			32 mm, mk, mx		✔	pic	ci_fs variant
    			dsPIC33		✔	pic	ci_fs variant
    			32mz		✔	pic32mz	musb variant
    MindMotion	mm32				✔	✖	mm32f327x_otg	ci_fs variant
    NordicSemi	nRF 52833, 52840, 5340				✔	✖	✖	nrf5x	only ep8 is ISO
    Nuvoton	NUC120				✔	✖	✖	nuc120
    	NUC121/NUC125, NUC126				✔	✖	✖	nuc121
    	NUC505				✔	✔	nuc505
    NXP	iMXRT			RT 10xx, 11xx	✔	✔	✔	ci_hs, ehci
    	Kinetis			KL	✔	⚠	✖	ci_fs, khci
    				K32L2	✔	✖	khci	ci_fs variant
    	LPC			11u, 13, 15	✔	✖	✖	lpc_ip3511
    				17, 40	✔	⚠	✖	lpc17_40, ohci
    				18, 43	✔	✔	✔	ci_hs, ehci
    				51u	✔	✖	✖	lpc_ip3511
    				54	⚠	⚠	✔	lpc_ip3511, lpc_ip3516	NRND, read errata
    				55	✔	✔	✔	lpc_ip3511, lpc_ip3516
    	MCX			N9	✔	✔	ci_fs, ci_hs, ehci
    				A15	✔	ci_fs
    	RW61x				✔	✔	✔	ci_hs, ehci
    Raspberry Pi	RP2040, RP2350				✔	✔	✖	rp2040, pio_usb
    Renesas	RX		63N, 65N, 72N		✔	✔	✖	rusb2
    	RA		4M1, 4M3, 6M1		✔	✔	✖	rusb2
    			6M5		✔	✔	✔	rusb2
    Silabs	EFM32GG12				✔	✖	dwc2
    Sony	CXD56				✔	✖	✔	cxd56
    ST STM32	F0, F3, L0, L1, L5, WBx5				✔	✖	✖	stm32_fsdev
    	F1	102, 103			✔	✖	✖	stm32_fsdev	512 USB RAM
    		105, 107			✔	✔	✖	dwc2
    	F2, F4, F7, H7, H7RS				✔	✔	✔	dwc2
    	C0, G0, H5, U3				✔	✔	✖	stm32_fsdev	2KB USB RAM
    	G4				✔	✖	✖	stm32_fsdev	1KB USB RAM
    	L4	4x2, 4x3			✔	✖	✖	stm32_fsdev	1KB USB RAM
    		4x5, 4x6, 4+			✔	✔	✖	dwc2
    	N6				✔	✔	✔	dwc2
    	U0				✔	✖	✖	stm32_fsdev	1KB USB RAM
    	U5	535, 545			✔	✔	✖	stm32_fsdev	2KB USB RAM
    		575, 585			✔	✔	✖	dwc2
    		59x,5Ax,5Fx,5Gx			✔	✔	✔	dwc2
    TI	MSP430				✔	✖	✖	msp430x5xx
    	MSP432E4, TM4C123				✔	✖	musb
    ValentyUSB	eptri				✔	✖	✖	eptri
    WCH	CH32F20x				✔	✔	ch32_usbhs
    	CH32V20x				✔	✖	stm32_fsdev/ch32_usbfs
    	CH32V305, CH32V307				✔	✔	ch32_usbfs/hs

    Table Legend

    ✔ Supported
    ⚠ Partial support
    ✖ Not supported by hardware
    [empty] Unknown

    Development Tools

    The following tools are provided freely to support the development of the TinyUSB project:

    • JetBrains CLion Cross-platform IDE for C and C++ development.
    • /wangyoufeng/tinyusb