| # 0.20.0 |
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| *November 19, 2025* |
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| ## General |
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| ### New MCUs and Boards |
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| - 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 |
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| ### Code Quality and Static Analysis |
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| - 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 |
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| ### Documentation |
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| - Improve Getting Started documentation structure and flow |
| - Add naming conventions and buffer handling documentation |
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| ## Controller Driver (DCD & HCD) |
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| ### DWC2 |
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| - 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 |
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| ### FSDEV (STM32) |
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| - Fix AT32 USB interrupt remapping in `dcd_int_enable()` |
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| ### OHCI |
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| - Add initial LPC55 OHCI support |
| - Improve data cache support |
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| ## Device Stack |
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| ### USBD Core |
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| - Support configurable EP0 buffer size CFG_TUD_ENDPOINT0_BUFSIZE |
| - Make dcd_edpt_iso_alloc/activate as default API for ISO endpoint |
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| ### Audio |
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| - Add UAC1 support |
| - Implement RX FIFO threshold adjustment with `tud_audio_get/set_ep_in_fifo_threshold()` |
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| ### CDC |
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| - Migrate to endpoint stream API |
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| ### HID |
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| - Fix HID stylus descriptor |
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| ### MIDI |
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| - Migrate to endpoint stream API |
| - Add `tud_midi_n_packet_write_n()` and `tud_midi_n_packet_read_n()` |
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| ### MTP |
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| - Fix incorrect MTP xact_len calculation |
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| ### Video |
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| - Add bufferless operation callback for dynamic frame generation with tud_video_prepare_payload_cb() |
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| ## Host Stack |
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| No changes |
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| ## Contributors |
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| 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. |
