.. _changelog_v3_9_3:

v3.9.3
======

v3.9.3 is a networking-and-stability release: it adds the **Bormio** board and
Portenta WiFi examples, updates LWIP, makes the PLL clock source configurable,
and fixes a batch of CYW43/LWIP, soft-reset, SDIO, MQTT, FLIR Lepton, and TV
bugs. It introduces **no breaking API changes** — v3.9.2 scripts run
unchanged.

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

Highlights
----------

- **Bormio** board support.
- **Portenta WiFi examples** added.
- **More reliable networking** — CYW43/LWIP and soft-reset fixes, a connect
  timeout, and updated LWIP.
- **No breaking API changes** — reflash and your v3.9.2 scripts run
  unchanged.

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

- **Portenta WiFi examples** added.
- The PLL clock source is now configurable, and flags were added to reserve
  DMA streams.

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

- Updated LWIP to the latest release; added a connection timeout to the CYW43
  ``connect()``; call ``gc_sweep_all`` on soft-reset to reclaim memory.

Bug fixes
---------

Networking:

- Fixed CYW43/LWIP and soft-reset bugs, used temporary DMA buffers for SDIO
  transfers, and made the MQTT library handle a ``None`` return from
  ``recv()``.

Camera and display:

- Updated the FLIR Lepton driver and fixed the RGB channel order for TV
  output.

System:

- Ensured PendSV is not masked before stopping/executing a script.

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

- **Bormio** — new board.

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

v3.9.3 introduces **no breaking Python API changes**. Scripts that ran on
v3.9.2 run unchanged on v3.9.3 — just reflash the firmware.