CircuitPython 9.2.0

This is CircuitPython 9.2.0, the latest minor revision of CircuitPython, and is a new stable release.

WARNING for nRF52 boards only: If your board has an nRF52 UF2 bootloader whose version is before 0.6.1, you will not be able to load CircuitPython 8.2.0 and later, due to increased size of the firmware. See these instructions for updating your bootloader.

Highlights of this release

• Fix RP2350 cache invalidation for PSRAM.

Notable changes in 9.2.0 from 9.1.x

• Raspberry Pi RP2350 support.
• Update to Espressif ESP-IDF V5.3.1, including new I2C driver.
• Merge MicroPython updates from v1.22.2 and v1.23.
• Espressif BLE improvements.
• Add math.dist().
• _eve updates.
• New busio.I2C.probe() and bitbangio.I2C.probe() methods to check for a single device address.
• ESP32-S3: implement sdioio.
• New audiodelays and audiofilters modules. These modules are experimental, and the API may change.
• Incompatible change: Change default hostname for all Espressif boards to the ESP-IDF default, which is espressif.
• Incompatible change: Use default hostname for mDNS. Fix mDNS collision mangling.

Incompatibility warnings

• Change default hostname for all Espressif boards to the ESP-IDF default, which is espressif. Previous board-specific names were not applied consistently. Use wifi.radio.hostname to set a custom hostname.
• Use default hostname for mDNS. Fix mDNS collision mangling. DNS hostnames will be different.

Download from circuitpython.org

Firmware downloads are available from the downloads page on circuitpython.org. The site makes it easy to select the correct file and language for your board.

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try code.circuitpython.org or the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040, RP2350
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4 (currently no USB support)
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.2.0-rc.0

Fixes and enhancements

Port and board-specific changes

Broadcom

Espressif

i.MX

nordic

renode

RP2

• Fix RP2350 cache invalidation for PSRAM. #9759. Thanks @dhalbert.

SAMx

SiLabs

Spresense

STM

Individual boards

Documentation changes

• Add note about different _bleio implementations. #9758. Thanks @dhalbert.

Build and infrastructure changes

• Remove version restrictions on Python cryptography library. #9757. Thanks @jepler.

Translation additions and improvements

New boards since 9.2.0-rc.0

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.2.0
  • 9.x.x
  • 10.0.0
  • long term
• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.

Thanks

Thank you to all who used, tested, and contributed toward this release, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.