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# 0.19.0
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*October 6, 2025*
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## General
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### New MCUs and Boards
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- Add ESP32-H4, ESP32-C5, ESP32-C61 support
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- Add STM32U0, STM32WBA, STM32N6
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- Add AT32F405, AT32F403A, AT32F415, AT32F423 support
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- Add CH32V305 support and CH32V20x USB host support
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- Add MCXA156 SDK 2.16 support and FRDM-MCXA156 board
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## API Changes
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### Core APIs
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- Add weak callbacks with new syntax for better compiler compatibility
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- Add `tusb_deinit()` to cleanup stack
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- Add time functions: `tusb_time_millis_api()` and `tusb_time_delay_ms_api()`
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- Add `osal_critical` APIs for critical section handling
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- Introduce `xfer_isr()` callback for ISO transfer optimization in device classes
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### Device APIs
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- CDC: Add notification support `tud_cdc_configure()`, `tud_cdc_n_notify_uart_state()`,
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`tud_cdc_n_notify_conn_speed_change()`, `tud_cdc_notify_complete_cb()`
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- MSC: Add `tud_msc_inquiry2_cb()` with bufsize parameter, update `tud_msc_async_io_done()`
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with `in_isr` parameter
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- Audio: Add `tud_audio_n_mounted()` and various FIFO access functions
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- MTP: Add `tud_mtp_mounted()`, `tud_mtp_data_send()`, `tud_mtp_data_receive()`,
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`tud_mtp_response_send()`, `tud_mtp_event_send()`
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### Host APIs
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- Core: Add `tuh_edpt_close()`, `tuh_address_set()`, `tuh_descriptor_get_device_local()`,
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`tuh_descriptor_get_string_langid()`, `tuh_connected()`, `tuh_bus_info_get()`
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- Add enumeration callbacks: `tuh_enum_descriptor_device_cb()`,
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`tuh_enum_descriptor_configuration_cb()`
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- CDC: Add `tuh_cdc_get_control_line_state_local()`, `tuh_cdc_get/set_dtr/rts()`,
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`tuh_cdc_connect/disconnect()` and sync versions of all control APIs
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- MIDI: Add `tuh_midi_itf_get_info()`, `tuh_midi_packet_read_n()`,
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`tuh_midi_packet_write_n()`, `tuh_midi_read_available()`, `tuh_midi_write_flush()`,
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`tuh_midi_descriptor_cb()`
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## Controller Driver (DCD & HCD)
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### DWC2
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- Support DWC2 v4.30a with improved reset procedure
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- Fix core reset: wait for AHB idle before reset
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- Add STM32 DWC2 data cache support with proper alignment
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- Host improvements:
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- Fix disconnect detection and SOF flag handling
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- Fix HFIR timing off-by-one error
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- Retry IN token immediately for bInterval=1
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- Proper attach debouncing (200ms)
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- Fix all retry intervals
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- Resume OUT transfer when PING ACKed
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- Fix enumeration racing conditions
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- Refactor bitfields for better code generation
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### FSDEV (STM32)
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- Fix AT32 compile issues after single-buffered endpoint changes
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- Add configurable single-buffered isochronous endpoints
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- Fix STM32H7 recurrent suspend ISR
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- Fix STM32L4 GPIOD clock enable for variants without GPIOD
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- Fix STM32 PHYC PLL stability wait
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- Improve PMA size handling for STM32U0
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### EHCI
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- Fix removed QHD getting reused
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- Fix NXP USBPHY disconnection detection
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### Chipidea/NXP
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- Fix race condition with spinlock
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- Improve iMXRT support: fix build, disable BOARD_ConfigMPU, fix attach debouncing on port1 highspeed
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- Fix iMXRT1064 and add to HIL test pool
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### MAX3421E
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- Use spinlock for thread safety instead of atomic flag
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- Implement `hcd_edpt_close()`
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### RP2040
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- Fix audio ISO transfer: reset state before notifying stack
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- Fix CMake RTOS cache variable
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- Abort transfer if active in `iso_activate()`
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### SAMD
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- Add host controller driver support
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## Device Stack
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### USBD Core
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- Introduce `xfer_isr()` callback for interrupt-time transfer handling
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- Add `usbd_edpt_xfer_fifo()` stub
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- Revert endpoint busy/claim status if `xfer_isr()` defers to `xfer_cb()`
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### Audio
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- Major simplification of UAC driver and alt settings management
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- Move ISO transfers into `xfer_isr()` for better performance
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- Remove FIFO mutex (single producer/consumer optimization)
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- Add implicit feedback support for data IN endpoints
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- Fix alignment issues
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- Update buffer macros with cache line size alignment
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### CDC
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- Add notification support: `CFG_TUD_CDC_NOTIFY`, `tud_cdc_n_notify_conn_speed_change()`, `tud_cdc_notify_complete_cb()`
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- Reduce default bInterval from 16ms to 1ms for better responsiveness
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- Rename `tud_cdc_configure_fifo()` to `tud_cdc_configure()` and add `tx_overwritable_if_not_connected` option
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- Fix web serial robustness with major overhaul and logic cleanup
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### HID
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- Add Usage Page and Table for Power Devices (0x84 - 0x85)
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- Fix HID descriptor parser variable size and 4-byte item handling
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- Add consumer page configurations
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### MIDI
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- Fix MIDI interface descriptor handling after audio streaming interface
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- Skip RX data with all zeroes
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### MSC
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- Add async I/O support for MSC using `tud_msc_async_io_done()`
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- Add `tud_msc_inquiry2_cb()` with bufsize for full inquiry response
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### MTP
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- Add new Media Transfer Protocol (MTP) device class driver
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- Support MTP operations: GetDeviceInfo, SendObjectInfo, SendObject
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- Add MTP event support with `tud_mtp_event_send()`
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- Implement filesystem example with callbacks
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- Add hardware-in-the-loop testing support
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### NCM
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- Add USB NCM link state control support
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- Fix DHCP offer/ACK destination
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### USBTMC
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- Add vendor-specific message support
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### Vendor
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- Fix vendor device reset and open issues
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- Fix descriptor parsing for `CFG_TUD_VENDOR > 1`
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- Fix vendor FIFO argument calculation
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## Host Stack
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### USBH Core
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- Major enumeration improvements:
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- Fix enumeration racing conditions
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- Add proper attach debouncing with hub/rootport handling (200ms delay)
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- Reduce `ENUM_DEBOUNCING_DELAY_MS` to 200ms
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- Always get language ID, manufacturer, product, and serial strings during enumeration
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- Always get first 2 bytes of string descriptor to determine length (prevents buffer overflow)
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- Support devices with multiple configurations
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- Add `tuh_enum_descriptor_device_cb()` and `tuh_enum_descriptor_configuration_cb()` callbacks
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- Add `tuh_descriptor_get_string_langid()` API
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- Hub improvements:
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- Check status before getting first device descriptor
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- Properly handle port status and change detection
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- Queue status endpoint for detach/remove events
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- Fix hub status change endpoint handling
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- Fix endpoint management:
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- `hcd_edpt_open()` returns false if endpoint already opened
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- Add `hcd_edpt_close()` implementation
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- Abort pending transfers on close
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- Add roothub debouncing flag to ignore attach/remove during debouncing
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- Move address setting and bus info management to separate structures
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- Force removed devices in same bus info before setting address
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### CDC Serial Host
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- Major refactor to generalize CDC serial drivers (FTDI, CP210x, CH34x, PL2303, ACM)
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- Add explicit `sync()` API with `TU_API_SYNC()` returning `tusb_xfer_result_t`
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- Rename `tuh_cdc_get_local_line_coding()` to `tuh_cdc_get_line_coding_local()`
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- Add `tuh_cdc_get_control_line_state_local()`
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- Implement `tuh_cdc_get/set_dtr/rts()` as inline functions
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### MIDI Host
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- Major API changes:
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- Rename `tuh_midi_stream_flush()` to `tuh_midi_write_flush()`
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- Add `tuh_midi_packet_read_n()` and `tuh_midi_packet_write_n()`
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- Add `CFG_TUH_MIDI_STREAM_API` to opt out of stream API
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- Change API to use index instead of device address (supports multiple MIDI per device)
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- Rename `tuh_midi_get_num_rx/tx_cables()` to `tuh_midi_get_rx/tx_cable_count()`
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- Add `tuh_midi_descriptor_cb()` and `tuh_midi_itf_get_info()`
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### MSC Host
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- Continue async I/O improvements
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### HID Host
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- Fix version string to actually show version
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## Contributors
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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.
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