TinyUSB¶

Overview¶

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.

Sponsors¶

TinyUSB’s continued development is made possible by its sponsors. If TinyUSB helps your products or projects, consider funding its development on GitHub Sponsors.

Platinum¶

Adafruit has backed TinyUSB since day one as its founding and sole Platinum sponsor. Buying their products directly funds the project’s development.

Sponsors (QWORD)¶

No QWORD sponsors yet — be the first!

Backers (DWORD)¶

No backers yet — be the first!

Supporters (Word)¶

cee****

Thanks (Byte)¶

@8086net, @GCRev

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 online documentation for information about using TinyUSB and how it is implemented.

Check out 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 GitHub Discussions as our forum. It is a great place to ask questions and advice from the community or to discuss your TinyUSB-based projects.

For bugs and feature requests, please 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.
WebUSB with vendor-specific class

If you have a special requirement, usbd_app_driver_get_cb() can be used to write your own class driver without modifying the stack. Here is how the RPi team added their reset interface 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
RT-Thread: repo
Mynewt Due to the newt package build system, Mynewt examples are better to be on its own repo

Supported CPUs¶

Manufacturer	Family				Device	Host	Highspeed	Driver	Note
Allwinner	F1C100s/F1C200s				✅		✅	sunxi	musb variant
Analog	MAX3421E					✅	❌	max3421	via SPI
Analog	MAX32 650, 666, 690, MAX78002				✅		✅	musb	1-dir ep
Artery AT32	F403a_407, F413				✅			stm32_fsdev	768 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
	S31				✅	✅	✅	dwc2
Geehy APM32	F072				✅		❌	stm32_fsdev	1KB USB RAM
	F103				✅		❌	stm32_fsdev	512 USB RAM
	F107				✅	✅	❌	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	nRF52, nRF53				✅	❌	❌	nrf5x	only ep8 is ISO
NordicSemi	nRF54				✅	❌	✅	dwc2
Nuvoton	NUC120				✅	❌	❌	nuc120
	NUC121/NUC125, NUC126				✅	❌	❌	nuc121
	NUC505				✅		✅	nuc505
NXP	iMXRT			RT 10xx, 11xx	✅	✅	✅	ci_hs, ehci	ERR050101 [4]
	Kinetis			KL, K32L	✅	🟡	❌	ci_fs
	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 [1]
				55	✅	✅	✅	lpc_ip3511, lpc_ip3516	USB.3/USB.5 [5]
	MCX			N9	✅		✅	ci_fs, ci_hs, ehci
	MCX			A15	✅			ci_fs
	RW61x				✅	✅	✅	ci_hs, ehci
Puya	PY32F071, PY32F072				✅	❌	❌	musb	1-dir ep [6]
Raspberry Pi	RP2040, RP2350				✅	✅	❌	rp2040, pio_usb
Renesas	RX		63N, 65N, 72N		✅	✅	❌	rusb2
	RA		4M1, 4M3, 6M1		✅	✅	❌	rusb2
	RA		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
	F1	105, 107			✅	✅	❌	dwc2
	F2, F4, F7, H7, H7RS				✅	✅	✅	dwc2
	C0, C5, G0, H5, U3				✅	✅	❌	stm32_fsdev	2KB USB RAM
	G4				✅	❌	❌	stm32_fsdev	1KB USB RAM
	L4	4x2, 4x3			✅	❌	❌	stm32_fsdev	1KB USB RAM
	L4	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
TI	MSP432E4, TM4C123				✅		❌	musb
ValentyUSB	eptri				✅	❌	❌	eptri
WCH	CH32F20x				🟡		✅	ch32_usbhs	ISO/INT [2] [3]
	CH32V20x				🟡		❌	stm32_fsdev/ch32_usbfs	ISO data loss [2]
	CH32V305, CH32V307				🟡		✅	ch32_usbfs/hs	ISO/INT [2] [3]
	CH583/2, CH32V103				🟡		❌	ch32_usbfs	ISO data loss [2]
	CH32X033, CH32X035				🟡		❌	ch32_usbfs	ISO data loss [2]

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:

IAR Build Tools (CX) Professional IDE and compiler for embedded development.
JetBrains CLion Cross-platform IDE for C and C++ development.
PVS-Studio static analyzer for C, C++, C#, and Java code.