0.19.0

October 6, 2025

General

New MCUs and Boards

  • Add ESP32-H4, ESP32-C5, ESP32-C61 support
  • Add STM32U0, STM32WBA, STM32N6
  • Add AT32F405, AT32F403A, AT32F415, AT32F423 support
  • Add CH32V305 support and CH32V20x USB host support
  • Add MCXA156 SDK 2.16 support and FRDM-MCXA156 board

API Changes

Core APIs

  • Add weak callbacks with new syntax for better compiler compatibility
  • Add tusb_deinit() to cleanup stack
  • Add time functions: tusb_time_millis_api() and tusb_time_delay_ms_api()
  • Add osal_critical APIs for critical section handling
  • Introduce xfer_isr() callback for ISO transfer optimization in device classes

Device APIs

  • CDC: Add notification support tud_cdc_configure(), tud_cdc_n_notify_uart_state(), tud_cdc_n_notify_conn_speed_change(), tud_cdc_notify_complete_cb()
  • MSC: Add tud_msc_inquiry2_cb() with bufsize parameter, update tud_msc_async_io_done() with in_isr parameter
  • Audio: Add tud_audio_n_mounted() and various FIFO access functions
  • MTP: Add tud_mtp_mounted(), tud_mtp_data_send(), tud_mtp_data_receive(), tud_mtp_response_send(), tud_mtp_event_send()

Host APIs

  • Core: Add tuh_edpt_close(), tuh_address_set(), tuh_descriptor_get_device_local(), tuh_descriptor_get_string_langid(), tuh_connected(), tuh_bus_info_get()
  • Add enumeration callbacks: tuh_enum_descriptor_device_cb(), tuh_enum_descriptor_configuration_cb()
  • CDC: Add tuh_cdc_get_control_line_state_local(), tuh_cdc_get/set_dtr/rts(), tuh_cdc_connect/disconnect() and sync versions of all control APIs
  • MIDI: Add tuh_midi_itf_get_info(), tuh_midi_packet_read_n(), tuh_midi_packet_write_n(), tuh_midi_read_available(), tuh_midi_write_flush(), tuh_midi_descriptor_cb()

Controller Driver (DCD & HCD)

DWC2

  • Support DWC2 v4.30a with improved reset procedure
  • Fix core reset: wait for AHB idle before reset
  • Add STM32 DWC2 data cache support with proper alignment
  • Host improvements:
    • Fix disconnect detection and SOF flag handling
    • Fix HFIR timing off-by-one error
    • Retry IN token immediately for bInterval=1
    • Proper attach debouncing (200ms)
    • Fix all retry intervals
    • Resume OUT transfer when PING ACKed
  • Fix enumeration racing conditions
  • Refactor bitfields for better code generation

FSDEV (STM32)

  • Fix AT32 compile issues after single-buffered endpoint changes
  • Add configurable single-buffered isochronous endpoints
  • Fix STM32H7 recurrent suspend ISR
  • Fix STM32L4 GPIOD clock enable for variants without GPIOD
  • Fix STM32 PHYC PLL stability wait
  • Improve PMA size handling for STM32U0

EHCI

  • Fix removed QHD getting reused
  • Fix NXP USBPHY disconnection detection

Chipidea/NXP

  • Fix race condition with spinlock
  • Improve iMXRT support: fix build, disable BOARD_ConfigMPU, fix attach debouncing on port1 highspeed
  • Fix iMXRT1064 and add to HIL test pool

MAX3421E

  • Use spinlock for thread safety instead of atomic flag
  • Implement hcd_edpt_close()

RP2040

  • Fix audio ISO transfer: reset state before notifying stack
  • Fix CMake RTOS cache variable
  • Abort transfer if active in iso_activate()

SAMD

  • Add host controller driver support

Device Stack

USBD Core

  • Introduce xfer_isr() callback for interrupt-time transfer handling
  • Add usbd_edpt_xfer_fifo() stub
  • Revert endpoint busy/claim status if xfer_isr() defers to xfer_cb()

Audio

  • Major simplification of UAC driver and alt settings management
  • Move ISO transfers into xfer_isr() for better performance
  • Remove FIFO mutex (single producer/consumer optimization)
  • Add implicit feedback support for data IN endpoints
  • Fix alignment issues
  • Update buffer macros with cache line size alignment

CDC

  • Add notification support: CFG_TUD_CDC_NOTIFY, tud_cdc_n_notify_conn_speed_change(), tud_cdc_notify_complete_cb()
  • Reduce default bInterval from 16ms to 1ms for better responsiveness
  • Rename tud_cdc_configure_fifo() to tud_cdc_configure() and add tx_overwritable_if_not_connected option
  • Fix web serial robustness with major overhaul and logic cleanup

HID

  • Add Usage Page and Table for Power Devices (0x84 - 0x85)
  • Fix HID descriptor parser variable size and 4-byte item handling
  • Add consumer page configurations

MIDI

  • Fix MIDI interface descriptor handling after audio streaming interface
  • Skip RX data with all zeroes

MSC

  • Add async I/O support for MSC using tud_msc_async_io_done()
  • Add tud_msc_inquiry2_cb() with bufsize for full inquiry response

MTP

  • Add new Media Transfer Protocol (MTP) device class driver
  • Support MTP operations: GetDeviceInfo, SendObjectInfo, SendObject
  • Add MTP event support with tud_mtp_event_send()
  • Implement filesystem example with callbacks
  • Add hardware-in-the-loop testing support

NCM

  • Add USB NCM link state control support
  • Fix DHCP offer/ACK destination

USBTMC

  • Add vendor-specific message support

Vendor

  • Fix vendor device reset and open issues
  • Fix descriptor parsing for CFG_TUD_VENDOR > 1
  • Fix vendor FIFO argument calculation

Host Stack

USBH Core

  • Major enumeration improvements:
    • Fix enumeration racing conditions
    • Add proper attach debouncing with hub/rootport handling (200ms delay)
    • Reduce ENUM_DEBOUNCING_DELAY_MS to 200ms
    • Always get language ID, manufacturer, product, and serial strings during enumeration
    • Always get first 2 bytes of string descriptor to determine length (prevents buffer overflow)
    • Support devices with multiple configurations
  • Add tuh_enum_descriptor_device_cb() and tuh_enum_descriptor_configuration_cb() callbacks
  • Add tuh_descriptor_get_string_langid() API
  • Hub improvements:
    • Check status before getting first device descriptor
    • Properly handle port status and change detection
    • Queue status endpoint for detach/remove events
    • Fix hub status change endpoint handling
  • Fix endpoint management:
    • hcd_edpt_open() returns false if endpoint already opened
    • Add hcd_edpt_close() implementation
    • Abort pending transfers on close
  • Add roothub debouncing flag to ignore attach/remove during debouncing
  • Move address setting and bus info management to separate structures
  • Force removed devices in same bus info before setting address

CDC Serial Host

  • Major refactor to generalize CDC serial drivers (FTDI, CP210x, CH34x, PL2303, ACM)
  • Add explicit sync() API with TU_API_SYNC() returning tusb_xfer_result_t
  • Rename tuh_cdc_get_local_line_coding() to tuh_cdc_get_line_coding_local()
  • Add tuh_cdc_get_control_line_state_local()
  • Implement tuh_cdc_get/set_dtr/rts() as inline functions

MIDI Host

  • Major API changes:
    • Rename tuh_midi_stream_flush() to tuh_midi_write_flush()
    • Add tuh_midi_packet_read_n() and tuh_midi_packet_write_n()
    • Add CFG_TUH_MIDI_STREAM_API to opt out of stream API
    • Change API to use index instead of device address (supports multiple MIDI per device)
  • Rename tuh_midi_get_num_rx/tx_cables() to tuh_midi_get_rx/tx_cable_count()
  • Add tuh_midi_descriptor_cb() and tuh_midi_itf_get_info()

MSC Host

  • Continue async I/O improvements

HID Host

  • Fix version string to actually show version

Contributors

Thanks to everyone who contributed to this release: @andrewleech, @armusin, @atoktoto, @byteit101, @ceedriic, @ChrisDeadman, @Cynventria, @dauc, @Dazza0, @deshipu, @Dolphindalt, @ehughes, @elipsitz, @fenugrec, @hathach, @HiFiPhile, @ho-ho-ho, @igi540, @IngHK, @Isoheptane, @james-advatek, @JannisKonradBecker, @jay94ks, @joelpmichael, @karlp, @kasjer, @ludoux, @majbthrd, @martijnvdwoude, @maximevince, @Milek7, @ning3270455369, @ohmdelta, @peppapighs, @pschatzmann, @PwnVerse, @raldone01, @ReimuNotMoe, @rhgndf, @roundby, @rppicomidi, @s09289728096, @salkinium, @tannewt, @terjr, @tore-espressif, @verylowfreq, @YixingShen, @ZakDanger.