CircuitPython 7.3.3 Released! @circuitpython

From the GitHub release page:

This is CircuitPython 7.3.3, the latest bugfix revision of CircuitPython, and is a new stable release.

Notable changes to 7.3.3 since 7.3.2

  • Adafruit MatrixPortal: Turn off ulab to allow freezing adafruit_portalbase, to create more available RAM.
  • Return None from usb_hid.get_last_received_report() when no report is available or the last report has already been read.
  • Don’t reload or enter REPL when autoreloading.
  • Fix _bleio.PacketBuffer handling of fixed-length characteristics.
  • Update frozen libraries.
  • Build macOS mpy-cross executables with macOS 11.

Download from

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


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 is available in

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:

  • atmel-samd: Microchip SAMD21, SAMx5x
  • cxd56: Sony Spresense
  • espressif: Espressif ESP32-S2
  • nrf: 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
  • espressif: ESP32-S3, ESP32-C3
  • litex: fomu
  • mimxrt10xx: NXP i.MX RT10xxx
  • stm: ST non-STM32F4 chip families

Changes since 7.3.2

Fixes and enhancements

  • Make PulseIn objects long-lived to prevent a bug. #6835, #6834. Thanks @DavePutz.
  • Update frozen libraries. #6817. Thanks @dhalbert.
  • Return None from usb_hid.get_last_received_report() when no report is available or the last report has already been read. #6818, #6810, #6808, #6717. Thanks @maximkulkin.
  • Don’t reload or enter REPL when auto-reloading. #6806, #6751. Thanks @tannewt.

Port and board-specific changes


  • Fix _bleio.PacketBuffer handling of fixed-length characteristics. #6800. Thanks @dhalbert.

Individual boards

  • Adafruit MatrixPortal: Remove ulab to allow freezing of adafruit_portalbase, to create more available RAM. #6809, #6779. Thanks @dhalbert.

Build and infrastructure changes

  • Build macOS mpy-cross executables with macOS 11. #6803, #6659. Thanks @dhalbert

New boards since 7.3.2

  • (none)

Known issues

  • See for other issues, including issues still to be addressed for:


Thank you to all who used, tested, and contributed since 7.3.2, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

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