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.