hathach/tinyusb

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An open source cross-platform USB stack for embedded system

Is hathach/tinyusb beginner-friendly?

In the last 30 days, hathach/tinyusb merged 8 of 32 pull requests from outside contributors, and its maintainers usually reply within 1 day. 5 beginner-friendly issues are open now.

Stars: 7.2k
Forks: 1.6k
Open beginner issues: 5
Indexed issues: 346
Avg merge: 1d 12h
Merged PRs (30d): 94

Dominant language: C
License: MIT
Last GitHub push: Oct 18, 2026
Latest indexed: Oct 18, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed

How to contribute to hathach/tinyusb

There is no contributing guide, so start from the README and a few recently merged pull requests to see how changes are proposed.
Your contributions will be published under the project's MIT license.
Pick one of the 5 open beginner-friendly issues below and comment that you want to work on it before you start.

Beginner friendly Everything

Open All

Issues somebody may already be working on are listed last. List everything by date

test_audio_host: out-of-bounds read in test_audio_host_uses_exponential_full_speed_iso_interval
Open
- Is something wrong?
followup Prio 📌

Difficulty 2/5 1-3 hours Newbie friendliness 84/100

hathach/tinyusb#4274 · Opened Oct 22, 2026

Maintainers usually reply within 1 day
samx7x dcd: apply errata 2.20.4 workaround on high-speed detach
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4273 · Opened Oct 22, 2026

Maintainers usually reply within 1 day
sunxi dcd: dcd_edpt_open/dcd_edpt_stall assert exits leave the USB IRQ masked
Open
- Is something wrong?
followup Prio 📌

Difficulty 2/5 1-3 hours Newbie friendliness 78/100

hathach/tinyusb#4272 · Opened Oct 22, 2026

Maintainers usually reply within 1 day
Pico-PIO-USB host: a device that drops off the root port during attach debounce is never reported again
Open
- Is something wrong?
Bug 🐞

Difficulty 4/5 1-2 days Newbie friendliness 45/100

hathach/tinyusb#4271 · Opened Oct 22, 2026

Maintainers usually reply within 1 day
usbh: document that set_config's result is ignored and completion must always be reported
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4270 · Opened Oct 22, 2026

Maintainers usually reply within 1 day
hil: the PR comment can post an earlier attempt's report when a re-run uploads nothing
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 52/100

hathach/tinyusb#4266 · Opened Oct 21, 2026

Maintainers usually reply within 1 day
host hub: RP2040 + Pico-PIO-USB stops after ClearPortFeature(C_CONNECTION), device behind hub never re-enumerated
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4261 · Opened Oct 20, 2026

Maintainers usually reply within 1 day
hid_host: failed interrupt IN reaches tuh_hid_report_received_cb as a report
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 1-2 days Newbie friendliness 48/100

hathach/tinyusb#4260 · Opened Oct 20, 2026

Maintainers usually reply within 1 day
hil: pool check and run_case refuse openocd_esp, and its board is never checked or selected
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4257 · Opened Oct 19, 2026

Maintainers usually reply within 1 day
hil: allow openocd_esp under CI once a retained session survives job-end cleanup
Open
- Is something wrong?
followup Prio 📌

Difficulty 5/5 Over a week Newbie friendliness 25/100

hathach/tinyusb#4256 · Opened Oct 19, 2026

Maintainers usually reply within 1 day
hil: the fork-to-try signal window stays open for a default SIGTERM and in build_board
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 44/100

hathach/tinyusb#4251 · Opened Oct 19, 2026

Maintainers usually reply within 1 day
hil: raspberry_pi_pico2 host port enumerates a CH340 instead of the roster's MSC drive
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4250 · Opened Oct 19, 2026

Maintainers usually reply within 1 day
dwc2: endpoint register updates still unlocked against the task on multi-core
Open
- Is something wrong?
followup Prio 📌

Difficulty 5/5 Over a week Newbie friendliness 35/100

hathach/tinyusb#4232 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
dwc2: TXFE refill can race endpoint disable and close_all in slave mode
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hathach/tinyusb#4231 · Opened Oct 14, 2026

Maintainers usually reply within 1 day
test/fuzz: class-specific seed corpora and a usable dictionary
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4223 · Opened Oct 13, 2026

Maintainers usually reply within 1 day
test/fuzz: fuzz lib/networking (DHCP/DNS servers)
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 52/100

hathach/tinyusb#4222 · Opened Oct 13, 2026

Maintainers usually reply within 1 day
test/fuzz: fuzz the remaining device classes
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4221 · Opened Oct 13, 2026

Maintainers usually reply within 1 day
test/fuzz: add a host-mode fuzz harness
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4220 · Opened Oct 13, 2026

Maintainers usually reply within 1 day
rp2 hcd: a failed EPX transfer keeps the data toggle it advanced when armed - the next transfer on that endpoint hits DATA_SEQ
May be free again A pull request for this issue was closed without being merged. Open
- Is something wrong?
Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4213 · Opened Oct 12, 2026

Maintainers usually reply within 1 day
nrf5x: stale data_received after re-arm while stalled or endpoint re-open
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4212 · Opened Oct 12, 2026

Maintainers usually reply within 1 day
usbd: replace the queued-SETUP counter with a SETUP generation
Open
- Is something wrong?
followup Prio 📌

Difficulty 5/5 Over a week Newbie friendliness 25/100

hathach/tinyusb#4210 · Opened Oct 12, 2026

Maintainers usually reply within 1 day
hil: stm32f723disco non-DMA host/cdc_msc_hid CDC echo intermittently reads nothing
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4203 · 1 comment · Opened Oct 11, 2026

Maintainers usually reply within 1 day
deps: bump Pico-PIO-USB after upstream #210 and #211 land
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4202 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
usbh: enumeration behind a removed hub is not stopped
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 52/100

hathach/tinyusb#4201 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
hub: harden hub_open and status replies against non-compliant devices
Open
- Is something wrong?
followup Prio 📌

Difficulty 3/5 1-2 days Newbie friendliness 73/100

hathach/tinyusb#4200 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
hub: status-change bitmap is read as one byte, ports 8 and up are never seen
Open
- Is something wrong?
followup Prio 📌

Difficulty 3/5 1-2 days Newbie friendliness 76/100

hathach/tinyusb#4199 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
stm32_fsdev dcd: idle ISO IN ZLP completion is taken for the newly queued packet
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 42/100

hathach/tinyusb#4198 · Opened Oct 11, 2026

Maintainers usually reply within 1 day
ci: CircleCI compiled config exceeds size limit when build selection is broad
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4194 · 1 comment · Opened Oct 10, 2026

Maintainers usually reply within 1 day
nrf5x: avoid EasyDMA while USBD is in Low Power mode
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4193 · Opened Oct 10, 2026

Maintainers usually reply within 1 day
usbh: OS_TID compared with NULL breaks the RTX4 host build
Open
- Is something wrong?
followup Prio 📌

Difficulty 1/5 Under an hour Newbie friendliness 84/100

hathach/tinyusb#4191 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
msp430x5xx: dcd_int_disable/enable write USBPWRCTL while USBKEYPID is locked
Open
- Is something wrong?
followup Prio 📌

Difficulty 3/5 1-2 days Newbie friendliness 68/100

hathach/tinyusb#4190 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
portable: migrate remaining drivers to the stack critical section (#4054)
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4189 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
portable: task-side RMWs left unprotected after the #4054 driver migration
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hathach/tinyusb#4188 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
usbd: ordered completion path for task-side DCD completions (musb, rusb2)
Open
- Is something wrong?
followup Prio 📌

Difficulty 5/5 Over a week Newbie friendliness 35/100

hathach/tinyusb#4187 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
osal: critical section does not exclude a foreign ISR calling into the stack on single core
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 42/100

hathach/tinyusb#4186 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
rusb2: NAK an OUT pipe on transfer completion to reduce parked packets
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hathach/tinyusb#4185 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
net: let ECM and RNDIS advertise an application-chosen link speed, as NCM does
Open
- Is something wrong?
followup Prio 📌

Difficulty 5/5 Over a week Newbie friendliness 35/100

hathach/tinyusb#4183 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
rp2040/hcd: validate interrupt abort on OUT endpoints and low-speed devices
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4180 · 1 comment · Opened Oct 9, 2026

Maintainers usually reply within 1 day
rp2040/hcd: device close frees an interrupt slot without draining a poll on the wire
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 1-2 days Newbie friendliness 48/100

hathach/tinyusb#4179 · Opened Oct 9, 2026

Maintainers usually reply within 1 day
usbh: tuh_edpt_abort_xfer releases the endpoint even when the HCD had nothing to abort
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hathach/tinyusb#4178 · 1 comment · Opened Oct 9, 2026

Maintainers usually reply within 1 day
ra: dfu-util .bin for portenta_c33 spans the OPTION_SETTING regions
Open
- Is something wrong?
followup Prio 📌

Difficulty 3/5 1-2 days Newbie friendliness 58/100

hathach/tinyusb#4176 · 1 comment · Opened Oct 8, 2026

Maintainers usually reply within 1 day
rusb2: OUT clear-halt and iso activate leave a stale BRDY after ACLRM
Open
- Is something wrong?
followup Prio 📌

Difficulty 3/5 1-2 days Newbie friendliness 65/100

hathach/tinyusb#4175 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
rp2040/hcd: remaining #3582 items (clear_stall panic, edpt_close, START_TRANS wait, EP0 MPS, SIE settle)
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 48/100

hathach/tinyusb#4171 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
rp2040/hcd: SETUP retries time out after an RX timeout on RP2040
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 38/100

hathach/tinyusb#4170 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
rp2040/hcd: validate EPX abort when a device is unplugged mid-transfer
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hathach/tinyusb#4169 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
rp2040/hcd: implement hcd_port_reset (retire EPX on root-port reset)
Open
- Is something wrong?
followup Prio 📌

Difficulty 5/5 Over a week Newbie friendliness 35/100

hathach/tinyusb#4168 · 1 comment · Opened Oct 8, 2026

Maintainers usually reply within 1 day
code_size: board_snapshot ignores build.py's ESP example rule
Open
- Is something wrong?
followup Prio 📌

Difficulty 3/5 1-2 days Newbie friendliness 52/100

hathach/tinyusb#4162 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
dcd_dwc2: reproduce the GINTMSK/DAINTMSK races fixed by #4115 on dual-core ESP32-S3/P4
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4159 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
dcd_dwc2: serialize DCTL read-modify-write between task and bus-reset ISR
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 45/100

hathach/tinyusb#4157 · Opened Oct 8, 2026

Maintainers usually reply within 1 day
HIL: UDisk 048d:04d2 NAKs its first GET_DESCRIPTOR for ~5 s, enumerating only through the retry
Open
- Is something wrong?
followup Prio 📌

Difficulty 4/5 3-5 days Newbie friendliness 35/100

hathach/tinyusb#4154 · Opened Oct 7, 2026

Maintainers usually reply within 1 day

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