.. _changelog_v3_6_2:

v3.6.2
======

v3.6.2 introduces the **OpenMV Cam RPC interface library**, adds custom color
palettes and raw byte access to images, an ``omv.disable_fb()`` performance
switch, **20× faster WINC WiFi**, and a large batch of imaging-pipeline
optimizations. It introduces **no breaking API changes** — v3.6.1 scripts run
unchanged.

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

Highlights
----------

- **RPC interface library** — a new OpenMV Cam remote-procedure-call library.
- **Custom color palettes** — ``draw_image()`` accepts user color palettes
  (including for grayscale).
- **Raw image access** — ``image.bytearray()`` exposes the raw image bytes.
- **20× faster WiFi** — major WINC WiFi performance improvement, with socket
  fixes.
- **No breaking API changes** — reflash and your v3.6.1 scripts run
  unchanged.

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

- **RPC** — added the new OpenMV Cam RPC interface library.
- **Custom palettes** — ``image.draw_image()`` now accepts custom color
  palettes (with grayscale support and demos).
- **Raw image bytes** — added ``image.bytearray()`` for raw read/write access
  to the image object.
- ``omv.disable_fb()`` — disable the IDE framebuffer for maximum
  performance.
- :mod:`image` compression methods now also accept already-JPEG images, and
  ``draw_image()`` gained negative scaling (removed again in v3.6.3).

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

- Improved WINC WiFi performance ~20×; optimized the data-matrix ops,
  ``negate`` / ``difference``, ``erode`` / ``dilate``, Bayer→YCbCr and
  Bayer→RGB565 conversion, and sensor copy (including full-resolution
  capture); updated the TensorFlow library to support int8; all pixel types
  now use the 40/80 MHz clock.

Bug fixes
---------

Networking:

- Fixed WINC ``send`` / ``sendto`` / ``recv`` / ``recvfrom``, closing sockets
  on error, and the ``ip_obtained`` bug for static IPs.

Camera and imaging:

- Fixed filter cleanup that corrupted memory when the Y size is smaller than
  the kernel size, the first invalid image after ``init0``, and the I2C/SPI
  DMA de-init issues on the H7.

System:

- FDCAN fixes; lowered the I2C reset timeout and increased the soft-I2C spin
  delay for the H7 Plus.

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

v3.6.2 introduces **no breaking Python API changes**. Scripts that ran on
v3.6.1 run unchanged on v3.6.2 — just reflash the firmware.