docs/changelog/0.19.0.md

# 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.