.. _changelog_v4_5_7:

v4.5.7
======

v4.5.7 adds PAG7920 sensor recognition, unifies the drawing pipeline onto the
``draw_image`` backend (GPU-offload ready), and fixes a JPEG-decoder boundary
bug and an STM32 MPU protection bug.

.. contents:: On this page
   :local:
   :depth: 1

Highlights
----------

- **PAG7920** sensor ID is now recognized.
- **Unified drawing pipeline** — line operations now run through the
  ``draw_image`` backend, which was refactored to support GPU offload.
- Fixed a JPEG-decoder boundary bug and an STM32 MPU protection bug.

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

- **PAG7920** — added the missing PAG7920 sensor enum so that sensor is
  recognized.

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

- **Drawing pipeline** — all line operations now use the ``draw_image``
  backend, and ``draw_image`` was refactored to support GPU offload
  (groundwork for hardware-accelerated drawing).
- **More RAM on non-JPEG boards** — the JPEG buffer is now reserved only when
  a hardware JPEG encoder is defined.
- :class:`ml.Model` — its printed representation now also shows the model
  address.
- **MicroPython submodule updated.**

Bug fixes
---------

- Fixed a JPEG-decoder boundary problem (``imlib/jpegd``).
- Fixed an STM32 MPU region-protection bug.

Hardware and board support
--------------------------

- **PAG7920** — the sensor is now recognized by its ID.

Breaking API changes
--------------------

User-visible API breaks between v4.5.6 and v4.5.7.

The only breaking change is narrow and affects just the RPC transport helper
libraries.

.. _v4_5_7_rpc:

RPC SPI/I2C master helpers moved to :mod:`machine` *(minor)*
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The ``rpc_spi_master`` and ``rpc_i2c_master`` helper libraries were updated to
use the :mod:`machine` module instead of the legacy :mod:`pyb` module. Scripts
that constructed these RPC transports with :mod:`pyb`-style arguments must switch
to the :mod:`machine`-style bus arguments.

*Commits:* `1ec77498a <https://github.com/openmv/openmv/commit/1ec77498a>`__,
`0154ada53 <https://github.com/openmv/openmv/commit/0154ada53>`__

Migration checklist
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Only RPC users are affected: if you used ``rpc_spi_master`` or
``rpc_i2c_master``, update the bus construction to :mod:`machine`-style
arguments (:ref:`the RPC helper change <v4_5_7_rpc>`). All other scripts run
unchanged.