9.2.0-alpha.2350

This is CircuitPython 9.2.0-alpha.2350, the first unstable release of 9.2.0. It likely contains bugs. It features support for the new Raspberry Pi microcontroller called the RP2350.

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.

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 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
• 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
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• raspberrypi: Raspberry Pi RP2350
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.1

Fixes and enhancements

• Add double buffering to RawSample by @timchinowsky in #9421
• 9.1.x: Warn on use of nonstandard sys.format_exception by @dhalbert in #9457
• displayio.Bitmap is now byte-aligned for depth < 8 by @deshipu in #9479

Port and board-specific changes

Broadcom

Espressif

• Add IPv6 support for Espressif by @jepler in #9436
• espressif: enable PCNT accumulator for Counter, FrequencyIn, Incremental Encoder by @vickash in #9461
• Add wifi.radio.listen_interval to ESP32-family chips. by @EternityForest in #9476

i.MX

Nordic

• bleio_user_reset(): check if BLE running before doing any BLE ops by @dhalbert in #9453

Renode

Raspberry Pi

• Add support for the new RP2350 by @tannewt in #9490
• Add looping to rp2040 analogbufio.BufferedIn by @timchinowsky in #9438

SAMx

SiLabs

Spresense

STM

Individual boards

• Extend board driver support for SSD1681 by @bradanlane in #9456

Documentation changes

• Update Standard Library sys documentation by @RetiredWizard in #9427
• Only use pyi files for autoapi doc generation by @jepler in #9466
• Mailmap by @rpavlik in #9462

Translation additions and improvements

New boards since 9.1.1

• VIDI X board by @lovrojakic in #8798
• Waveshare RP2040 One by @johnnohj in #9484
• Adafruit Feather RP2350 by @tannewt
• Adafruit Metro RP2350 by @tannewt
• Cytron Motion 2350 Pro by @SalamCytron
• Raspberry Pi Pico 2 by @tannewt
• Solder Party RP2350 Stamp by @arturo182
• Solder Party RP2350 Stamp XL by @arturo182

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.2.0
  • 9.1.x
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.1.0, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.