# 0.20.0

*November 19, 2025*

## General

### New MCUs and Boards

- Add STM32U3 device support (adjusted from STM32U0)
- Add nRF54H20 support with initial board configuration
- Rename board names: pca10056→nrf52840dk, pca10059→nrf52840dongle, pca10095→nrf5340dk
- Improve CMake: Move startup and linker files from board target to executable. Enhance target warning flags and fix various build warnings

### Code Quality and Static Analysis

- Add PVS-Studio static analysis to CI
- Add SonarQube scan support
- Add IAR C-Stat analysis capability
- Add `.clang-format` for consistent code formatting
- Fix numerous alerts and warnings found by static analysis tools

### Documentation

- Improve Getting Started documentation structure and flow
- Add naming conventions and buffer handling documentation

## Controller Driver (DCD & HCD)

### DWC2

- Fix incorrect handling of Zero-Length Packets (ZLP) in the DWC2 driver when receiving data (OUT transfers)
- Improve EP0 multi-packet logic
- Support EP0 with max packet size = 8
- For IN endpoint, write initial packet directly to FIFO and only use TXFE interrupt for subsequent packets
- Fix ISO with bInterval > 2 using incomplete IN interrupt handling.
- Fix compile issues when enabling both host and device
- Clear pending suspend interrupt after USB reset (enum end)
- Improve host closing endpoint and channel handling when device is unplugged

### FSDEV (STM32)

- Fix AT32 USB interrupt remapping in `dcd_int_enable()`

### OHCI

- Add initial LPC55 OHCI support
- Improve data cache support

## Device Stack

### USBD Core

- Support configurable EP0 buffer size CFG_TUD_ENDPOINT0_BUFSIZE
- Make dcd_edpt_iso_alloc/activate as default API for ISO endpoint

### Audio

- Add UAC1 support
- Implement RX FIFO threshold adjustment with `tud_audio_get/set_ep_in_fifo_threshold()`

### CDC

- Migrate to endpoint stream API

### HID

- Fix HID stylus descriptor

### MIDI

- Migrate to endpoint stream API
- Add `tud_midi_n_packet_write_n()` and `tud_midi_n_packet_read_n()`

### MTP

- Fix incorrect MTP xact_len calculation

### Video

- Add bufferless operation callback for dynamic frame generation with tud_video_prepare_payload_cb()

## Host Stack

No changes

## Contributors

Thanks to everyone who contributed to this release: @adam-embedded, @ArcaneNibble, @c1570, @embedded-ideas, @gabChouin, @hathach, @HiFiPhile, @karlp, @ldube, @peppapighs, @poornadharshan13-rgb, @RigoLigoRLC, @tangpipi, @ToonVanEyck, @tswan22.
