CircuitPython 9.2.0-alpha.2351

This is CircuitPython 9.2.0-alpha.2351, an alpha release for 9.2.0. It has significant known bugs, and will have further additions and fixes before the final release of 9.2.0.

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 Adafruit FunHouse build, which was not working.
• Correct pins for Adafruit Feather ESP32-C6.
• Prevent crash or hang on nRF boards when stopping VM and BLE is not running.
• Many new RP2350 boards.
• Update to Espressif ESP-IDF V5.3.
• Merge MicroPython updates from v1.22.2.

Notable changes in 9.2.0 from 9.1.x

• Raspberry Pi RP2350 support.
• Update to Espressif ESP-IDF V5.3.
• Merge MicroPython updates from v1.22.2.

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, 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
• 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-alpha.2350

Fixes and enhancements

• Correct printing of stdio type name. #9544. Thanks @timdechant.
• aurora_epaper display support. #9488. Thanks @wyrdsec.
• Merge from MicroPython v1.22.2 release. #9469. Thanks @dhalbert.

Port and board-specific changes

Broadcom

Espressif

• Update to ESP-IDF v5.3. #9526. Thanks @tannewt.
• Fix Espressif startup. #9512. Thanks @tannewt.

i.MX

nordic

• Reduce sleep power consumption by PinAlarm. #9534. Thanks @Sola85.
• Prevent crash or hang on VM shutdown when BLE not running. #9453. Thanks @dhalbert.

renode

RP2

• Use pico-sdk-style interrupt names. #9520. Thanks @tannewt.
• Enable PIO USB Host on RP2350. #9514. Thanks @tannewt.
• Enable rgbmatrix on RP2350. #9513. Thanks @tannewt.
• Add support for additional UART pins on RP2350 (UART_AUX capability). #9500. Thanks @tannewt.

SAMx

SiLabs

Spresense

STM

Individual boards

• Adafruit Feather ESP32-C6 pin corrections. #9525, #9475. Thanks @dhalbert.
• Adafruit FunHouse: fix hang when starting WiFi. #9546, #9545. Thanks @tannewt.
• Pimoroni Tiny 2040: Add board.BUTTON. #9531. Thanks @tannewt and @ZodiusInfuser.

Documentation changes

• Fix _bleio signatures. #9540 .Thanks @elpekenin.
• Fix ReadTheDocs build. #9466. Thanks @jepler.

Build and infrastructure changes

• Remove unused error messages and consolidate others. #9516. Thanks @tannewt.
• Switch back to upstream TinyUSB submodule. #9499. Thanks @tannewt.

Translation additions and improvements

• Thanks for translations:
  • @andibing (English - UK)
  • @hexthat (Chinese - Pinyin)
  • @wtuemura (Portugese - Brazil)

New boards since 9.2.0-alpha.2350

• Adafruit Vindie S2. #9518. Thanks @BlitzCityDIY.
• Cytron IRIV IO Controller. #9509, #9497. Thanks @CytronTechnologies.
• Espressif ESP32-S3-DevKitC-1-N16. This version has no PSRAM. #9512. Thanks @tannewt.
• LILYGO T-Watch-S3. #9480. Thanks @bill88t.
• Pimoroni Pico Plus 2. #9531. Thanks @tannewt and @ZodiusInfuser.
• Pimoroni PGA2350. #9531. Thanks @tannewt and @ZodiusInfuser.
• Pimoroni Plasma 2350. #9531. Thanks @tannewt and @ZodiusInfuser.
• Pimoroni Tiny RP2350. #9531. Thanks @tannewt and @ZodiusInfuser.
• SparkFun Pro Micro 2350. #9515. Thanks @tannewt.
• Unexpected Maker OMGS3. #9522. Thanks @UnexpectedMaker.
• Unexpected Maker TGB Touch Mini. #9522. Thanks @UnexpectedMaker.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.1.x
  • 9.2.0
  • 9.x.x
  • 10.0.0
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.2.0-alpha.2350, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.