.. _changelog_ide_v2_6_4:

v2.6.4
======

v2.6.4 brings full Arduino Portenta H7 support, a generic DFU
bootloader-detection and flashing workflow, and a set of Edge Impulse dataset
improvements. It is built on Qt Creator 4.0.2 (unchanged from the previous
release) and contains no breaking changes for existing projects.

.. contents:: On this page
   :backlinks: none
   :local:
   :depth: 1

Highlights
----------

- **Arduino Portenta H7** is now fully supported, including DFU-mode firmware
  flashing via ``dfu-util`` so the board can be programmed straight from
  OpenMV IDE.
- **DFU bootloader detection** adds a *DFU bootloader(s) found* dialog offering
  *Reset Firmware to Release Version*, *Load Specific Firmware File*, or *Erase
  Onboard Data Flash*.
- **DFU programming engine** driven by a new ``dfu.txt`` flashes both raw
  ``.bin`` and packaged ``.dfu`` firmware with per-board commands and
  serial-number targeting.
- **Edge Impulse uploads** now accept PNG and BMP images alongside JPG/JPEG,
  report upload statistics on completion, and no longer freeze the UI.
- **Smaller download** after removing large prebuilt ``.elf`` firmware files and
  unused submodules from the bundle.

New features
------------

- **Arduino Portenta H7** support with a dedicated bootload, erase, and program
  flow over DFU (device ``2341:035b``), DFU-mode firmware flashing via
  ``dfu-util``, and the license check disabled for the board
  (`488efe191 <https://github.com/openmv/qt-creator/commit/488efe191>`__,
  `8b8090e27 <https://github.com/openmv/qt-creator/commit/8b8090e27>`__,
  `5195fa5a8 <https://github.com/openmv/qt-creator/commit/5195fa5a8>`__).
- **Generic DFU bootloader detection** lists attached DFU devices via
  ``dfu-util -l``, adds a device-selection dialog, and presents a three-button
  *DFU bootloader(s) found* dialog with *Reset Firmware to Release Version*,
  *Load Specific Firmware File*, and *Erase Onboard Data Flash*
  (`0106b4687 <https://github.com/openmv/qt-creator/commit/0106b4687>`__,
  `8b8090e27 <https://github.com/openmv/qt-creator/commit/8b8090e27>`__).
- **DFU programming engine** driven by a new ``dfu.txt`` that defines per-board
  ``vidpid``, ``eraseCommands``, ``binProgramCommand``, and ``dfuProgramCommand``,
  flashing both raw ``.bin`` and packaged ``.dfu`` firmware and targeting the
  board's serial number
  (`d8274828d <https://github.com/openmv/qt-creator/commit/d8274828d>`__,
  `33c3c101a <https://github.com/openmv/qt-creator/commit/33c3c101a>`__).
- **Frame-skip export** in the Convert/Save Video tools adds a *Skip frames?*
  option to decimate frames when exporting to ``.bin``, and now requests
  ffmpeg's highest JPEG quality (``-q:v 1``)
  (`2c4fd1cb5 <https://github.com/openmv/qt-creator/commit/2c4fd1cb5>`__).
- **Edge Impulse upload statistics** dialog reports files uploaded, responses
  received, new images added, and images marked as duplicates after an upload
  completes
  (`af179e44c <https://github.com/openmv/qt-creator/commit/af179e44c>`__).

Other changes and improvements
------------------------------

- Added a bootloader-entry serial command (``__USBDBG_SYS_RESET_TO_BL``) so
  Arduino boards reset directly into their DFU bootloader instead of a plain
  system reset
  (`9475fd6de <https://github.com/openmv/qt-creator/commit/9475fd6de>`__,
  `488efe191 <https://github.com/openmv/qt-creator/commit/488efe191>`__).
- Edge Impulse dataset uploads now accept PNG and BMP images in addition to
  JPG/JPEG, match class-folder and numbered snapshot names more flexibly, and
  convert all images to JPG before uploading
  (`af179e44c <https://github.com/openmv/qt-creator/commit/af179e44c>`__).
- A sensor ID of ``0xFF`` is now treated as ``None`` (no camera sensor), the
  license check is skipped for such boards, and sensor-type detection runs
  earlier in the connect flow
  (`138ab3c12 <https://github.com/openmv/qt-creator/commit/138ab3c12>`__).
- Added Arduino and Edge Impulse partner logos to the About dialog
  (`138ab3c12 <https://github.com/openmv/qt-creator/commit/138ab3c12>`__).
- Edge Impulse uploads now handle empty or invalid datasets gracefully,
  showing a *Nothing to upload* dialog instead of attempting an upload
  (`cf976b24b <https://github.com/openmv/qt-creator/commit/cf976b24b>`__).
- Removed large prebuilt ``.elf`` firmware files and the unused ``labview``,
  ``ros``, and ``qtrest`` submodules from the bundle, shrinking the download
  (`5fa17d9b2 <https://github.com/openmv/qt-creator/commit/5fa17d9b2>`__,
  `18f28fd5a <https://github.com/openmv/qt-creator/commit/18f28fd5a>`__).
- Marked the bundled ``dfu-util`` binaries executable so DFU flashing works on
  Linux and macOS
  (`f34a0e80f <https://github.com/openmv/qt-creator/commit/f34a0e80f>`__).

Bug fixes
---------

- Fixed the IDE lagging and freezing during Edge Impulse dataset uploads by
  pumping the event loop between network requests
  (`7568c0713 <https://github.com/openmv/qt-creator/commit/7568c0713>`__).
- Fixed the Edge Impulse *Edge Impulse Projects* selection dialog to correctly
  preselect the last-used project
  (`cf976b24b <https://github.com/openmv/qt-creator/commit/cf976b24b>`__).

Platform and tool support
-------------------------

- **Qt Creator base:** 4.0.2.
- **New board:** Arduino Portenta H7 (``PORTENTA_H7_8192_SDRAM``, vid:pid
  ``2341:035b``).
- **Bundled firmware** refreshed for OPENMV2, OPENMV3, OPENMV4, OPENMV4P, and
  PORTENTA (new ``firmware.bin``/``openmv.bin``/``uvc.bin`` and DFU binaries).

Breaking changes
----------------

None. Existing projects and workflows continue to work unchanged.