CircuitPython 10.1.0-beta.0

This is CircuitPython 10.1.0-beta.0, a beta release for 10.1.0. It has known bugs that will be fixed before the final release of 10.1.0.

Highlights of this release

• Update espressif ESP-IDF to v5.5.1 and support ESP32-C61.

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-C2, ESP32-C3, ESP32-C6, ESP32-C61, ESP32-H2, ESP32-S2, ESP32-S3
• 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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: , ESP32-P4
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Update ESP-IDF to v5.5.1 and support ESP32-C61. #10676. Thanks @tannewt.

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.x
  • 10.1.0
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.3

This is CircuitPython 10.0.3, the latest bugfix revision of CircuitPython, and is a new stable release.

Highlights of this release

• Fix SPI DMA on atmel-samd boards, which fixes SD card mounting problems.
• Restore SD card USB presentation on atmel-samd boards.
• No changes in this release for non-atmel-samd boards.

CircuitPython 10.0.2 was skipped due to a build problem.

Incompatibility warnings when upgrading to 10.0.x from 9.x.x

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio has removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

SAMx

• Restore presenting mounted SD cards as USB drives. #10677. Thanks @dhalbert.
• Fix SPI DMA implementation, which fixes SD card mounting problems. #10668. Thanks @dhalbert.

SiLabs

Spresense

STM

Zephyr

Individual boards

Documentation changes

Build and infrastructure changes

• Restrict cryptography to versions older than 45.0.0. #10679. Thanks @tannewt and @dhalbert.

Translation additions and improvements

New boards

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.x
  • 10.1.0
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.1

This is CircuitPython 10.0.1, the latest bugfix revision of CircuitPython, and is a new stable release.

Highlights of this release

• Fix 10.0.0 regression preventing writing to a filesystem other than CIRCUITPY via USB.

Incompatibility warnings when upgrading to 10.0.x from 9.x.x

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio has removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

• Fix filesystem writability from USB. #10659. Thanks @dhalbert.
• Fix crashes when subclassing deque. #10653. Thanks @dhalbert.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• SparkFun STM32 MicroMod: fix USB PID. #10654. Thanks @cgnd.

Documentation changes

• Add TilePaletteMapper to pixel_shader allowed types. #10662. Thanks @FoamyGuy.

Build and infrastructure changes

• Fix mpy-cross build failure when using clang (e.g., macOS). #10656. Thanks @dhalbert.
• circuitpython_setboard: import importlib Traversable from new location. #10661. Thanks @dhalbert.

Translation additions and improvements

New boards

• M5Stack DinMeter. #10650. Thanks @juergenpabel.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.0

This is CircuitPython 10.0.0, the latest major revision of CircuitPython, and is a new stable release.

This release is identical to 10.0.0-rc.0 except for its version number.

Incompatibility warnings when upgrading to 10.0.0 from 9.x.x

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio has removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

Notable changes to 10.0.0 not in 9.x.x

Audio

• Add effects: audiodelays.Chorus, audiodelays.MultiTapDelay, audiofreeverb.Freeverb, audioFilters.Phaser.
• Add audiomixer.MixerVoice.panning, with synthio.BlockInput support.
• Add synthio.MidiTrack.tempo.
• Rename synthio.BlockBiquad to synthio.Biquad. See Incompatibility warnings above.
• Convert mono audio to stereo when going through a stereo audiomixer.Mixer.
• Add MixerVoice.end().

Built-in modules

• Initial experimental implementation of MicroROS.
• Improve accuracy of time.sleep() and similar functions.

Graphics

• Support quad-color and "Spectra6" six-color e-ink displays.
• tilepalettemapper.TilePaletteMapper now supports displayio.ColorConverter.
• Add lvfontio.OnDiskFont to support on-disk fonts for terminalio.
• Add Terminal.cursor_x and .cursor_y.
• Add picodvi.Framebuffer.color_depth.
• Improve picodvi timing to accomodate more monitors.

Internal

• Improved garbage collection times: skip scanning inside objects with no pointers.
• Update TinyUSB.
• Merge MicroPython updates up to MicroPython v1.25.0.
• Update Espressif ESP-IDF to 5.4.1.
• Update Raspberry Pi pico-sdk to 2.2.0 and cyw43-driver to v1.1.0.

Networking

• Use full Mozilla SSL root certificate list for all network-capable boards.
• Add wifi.radio.power_management to control WiFi power consumption while listening.

Python interpreter

Storage

• Add CPSAVES partition (currently only on Adafruit Fruit Jam).

Supervisor

USB

• Present mounted SD cards and CPSAVES as additional USB drives.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.0-rc.0

This is CircuitPython 10.0.0-rc.0, a release candidate for 10.0.0 final. This release is believed to be stable, and is meant for testing before the final release of 10.0.0.

Highlights of this release

• Allow chained calls for audio effects and audio mixer.
• Bug fixes.

Incompatibility warnings

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

• Update frozen libraries. #10649. Thanks @dhalbert.
• Ensure that additional mounted filesystems are read-only to the host if read-write to CircuitPython, and vice versa. #10648. Thanks @dhalbert.
• Prevent spurious auto-reloads when host writes the filesystem dirty bit. #10645. Thanks @dhalbert.
• Allow chained calls for audio effects and audio mixer. #10635. Thanks @relic-se.
• Ensure USB host buffers are in DMA-capable RAM. #10633. Thanks @tannewt.
• Always include module name for clarity when reporting an import failure. #10629. Thanks @dhalbert.
• Give better error when mistakenly importing a MicroPython .mpy file. #10622. Thanks @dhalbert.
• Improve usb.core.Device error handling. #10616. Thanks @samblenny.

Port and board-specific changes

Analog Devices

• Add busio support. #10413. Thanks @Brandon-Hurst.

Broadcom

Espressif

• Return correct error code on network connect failure. #10631. Thanks @dhalbert.
• Use standard LWIP defaults in sdkconfig.defaults to allow more sockets. #10609. Thanks @dhalbert.

i.MX

Nordic

renode

RP2

• Fix crash after rotaryio.IncrementalEncoder constructor failure. #10634. Thanks @dhalbert.
• Fix LWIP-related crashes by putting port heap operations in critical sections. #10631, #10615. Thanks @dhalbert.
• Incorporate recent MicroPython LWIP-related fixes. #10631. Thanks @dhalbert.
• Fix PIO wait pin validation. #10627. Thanks @Supermath101 and @dhalbert.

SAMx

• Disable SD card mount presented as USB drive, due to a SAMD-specific issue. #10645. Thanks @dhalbert.
• Release SERCOM on I2C deinit. #10402. Thanks @eightycc.

SiLabs

Spresense

STM

Zephyr

Individual boards

• Bradán Lane STUDIO Core M0: add more built-in modules. #10601. Thanks @bradanlane.
• M5Stack Cardputer: fix boot loop. #10607. Thanks @dhalbert.
• M5Stack CoreS3: improve pin definitions. #10558. Thanks @CDarius.

Documentation changes

• Improve struct_time and time.localtime() documentation and type annotations. #10603. Thanks @proveskit.
• Improve wifi.Radio type annotations. #10602. Thanks @proveskit.

Build and infrastructure changes

• Move adabot cron workflows to circuitpython repo. #10596. Thanks @FoamyGuy.
• Use RUN_BACKGROUND_TASKS as MICROPY_INTERNAL_EVENT_HOOK, so it doesn't have to be called explicitly from mp_event_wait_*(). #10379. Thanks @jepler.

Translation additions and improvements

New boards

• Espressif ESP32-C3 Lyra V2. #10625. Thanks @oroblancoinc.
• Prokyber Ai-On-The-Edge-Cam. #10605. Thanks @allexoK.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.0
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 9.2.9

This is CircuitPython 9.2.9, the latest bugfix 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 network crashes on Pico W; fixes regression since 9.2.5.

Incompatibility warnings

• Uses of deprecated displayio bindings are now called out with warnings. For instance, displayio.Display is deprecated in favor of busdisplay.BusDisplay. In CircuitPython 10.0.0 the deprecated bindings will be removed.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with nRF5340, nRF54L15, RA6M5, STM32H7

Changes

Fixes and enhancements

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

• Put LWIP storage operations in a critical section. #10617, #10615. Thanks @dhalbert and @bablokb.

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards

• Orpheus Pico. #10406. Thanks @samdev-7.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.2.x
  • 9.x.x
  • 10.0.0
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.0-beta.3

This is CircuitPython 10.0.0-beta.3, a beta release for 10.0.0. It has known bugs that will be fixed before the final release of 10.0.0.

Highlights of this release

• Convert mono audio to stereo when going through a stereo audiomixer.Mixer.
• Add audiomixer.MixerVoice.panning, with synthio.BlockInput support.
• Add synthio.MidiTrack.tempo.
• Restore missing audioio module on ESP32 and ESP32-S2.
• RP2xxx DVI now works on more monitors and has fewer glitches.

Incompatibility warnings

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

• Fix lvfontio memory allocation. #10599. Thanks @tannewt.
• Update frozen libraries. #10597, #10575. Thanks @FoamyGuy and @dhalbert.
• Claim USB host pins on board startup to prevent accidental reuse. #10585. Thanks @dhalbert.
• Add synthio.MidiTrack.tempo. #10579, #10567. Thanks @relic-se.
• Allow usb_hid.Device Usage value to be 0, instead of starting at 1; some devices use 0. #10577. Thanks @dhalbert.
• Update tinyusb. #10559. Thanks @samblenny.
• Convert mono audio to stereo when going through a stereo audiomixer.Mixer; add audiomixer.MixerVoice.panning, with synthio.BlockInput support. #10529. Thanks @relic-se

Port and board-specific changes

Analog Devices

• Add RTC implementation, including rtc module. #10592. Thanks @PaggieZ.
• Add os.urandom. #10549. Thanks @PaggieZ.

Broadcom

Espressif

• Restore missing audioio module on ESP32 and ESP32-S2. #10578. Thanks @dhalbert.

i.MX

Nordic

renode

RP2

• Fix DVI blanking during NeoPixel updates. #10600. Thanks @tannewt.
• Fix DVI blanking during SPI transactions. #10598. Thanks @tannewt.
• Fix processor name for two Pimoroni boards to rp2350a. #10593. Thanks @bablokb.
• Update to pico-sdk 2.2.0 and cyw43-driver v1.1.0. #10587. Thanks @dhalbert.
• Improve picodvi refresh rate timing to accomodate more monitors. #10534. Thanks @samblenny and @WolfWings.

SAMx

• Shrink some SAMD21 builds due to code growth. #10589, #10581. Thanks @dhalbert.

SiLabs

Spresense

STM

Zephyr

Individual boards

• Adafruit Feather ESP32-S2 and ESP32-S3: correct board.UART() pins. #10537. Thanks @dhalbert.

Documentation changes

• Fix busio.UART.Parity documentation. #10582. Thanks @dhalbert.

Build and infrastructure changes

Translation additions and improvements

• Thanks for translations:
  • @CrackXT (French, Polish, Spanish)

New boards

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.0
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • long term
• M5Stack Cardputer builds are not working. Use 9.2.8 for now.
• 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.

CircuitPython 10.0.0-beta.2

This is CircuitPython 10.0.0-beta.2, a beta release for 10.0.0. It has known bugs that will be fixed before the final release of 10.0.0.

This release is the same as CircuitPython 10.0.0-beta.1 and replaces it. Some boards failed to build during the beta.1 release process due to a third-party website problem. This release fixes that problem but is otherwise the same.

Highlights of this release

• Support quad-color e-paper displays.
• Support MagTag 2025 Edition display.
• Use full Mozilla SSL root certificate list for all network-capable boards.

Incompatibility warnings

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

• Fix heap growth calculation, which was preventing early large allocations. #10525. Thanks @tannewt.
• Support quad-color e-paper displays. #10519. Thanks @tannewt.
• Use full Mozilla SSL root certificate list for all network-capable boards, instead of previous smaller list. #10508, #10354. Thanks @dhalbert.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Return correct deep-sleep wakeup pin on ESP32. #10513. Thanks @dhalbert.
• Restore settable microcontroller.cpu.frequency on all but 2MB-flash boards. #10495. Thanks @dhalbert.
• Fix storage allocation in frequencyio.FrequencyIn. #10490. Thanks @dhalbert and @Sola85.

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• Adafruit Fruit Jam: add board.IR pin. #10486. Thanks @BlitzCityDIY.
• Adafruit MagTag: support new displays on MagTag 2025 edition. #10505. Thanks @tannewt.

Documentation changes

• Improve description of when settings.toml is read. #10493. Thanks @tannewt.
• Improve Terminal escape code documentation. #10492. Thanks @tannewt.
• Add a static stubs directory and include micropython.const in the stubs. #10485. Thanks @dunkmann00.

Build and infrastructure changes

• Change nrfutil download location. #10530. Thanks @dhalbert.

Translation additions and improvements

• Thanks for translations:
  • @MuskoM (Polish)
  • @odeevee (French)
  • @ourpxi (Spanish)
  • @supcik (French)

New boards

• senseBox-eye ESP32S3. #10523. Thanks @sensebox.
• Waveshare ESP32-S3-LCD-1.47. #10509. Thanks @liduanjun.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.0
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.0-beta.1

This is CircuitPython 10.0.0-beta.1, a beta release for 10.0.0. It has known bugs that wil be fixed before the final release of 10.0.0.

Highlights of this release

• Support quad-color e-paper displays.
• Support MagTag 2025 Edition display.
• Use full Mozilla SSL root certificate list for all network-capable boards.

Incompatibility warnings

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

• Fix heap growth calculation, which was preventing early large allocations. #10525. Thanks @tannewt.
• Support quad-color e-paper displays. #10519. Thanks @tannewt.
• Use full Mozilla SSL root certificate list for all network-capable boards, instead of previous smaller list. #10508, #10354. Thanks @dhalbert.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Return correct deep-sleep wakeup pin on ESP32. #10513. Thanks @dhalbert.
• Restore settable microcontroller.cpu.frequency on all but 2MB-flash boards. #10495. Thanks @dhalbert.
• Fix storage allocation in frequencyio.FrequencyIn. #10490. Thanks @dhalbert and @Sola85.

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• Adafruit Fruit Jam: add board.IR pin. #10486. Thanks @BlitzCityDIY.
• Adafruit MagTag: support new displays on MagTag 2025 edition. #10505. Thanks @tannewt.

Documentation changes

• Improve description of when settings.toml is read. #10493. Thanks @tannewt.
• Improve Terminal escape code documentation. #10492. Thanks @tannewt.
• Add a static stubs directory and include micropython.const in the stubs. #10485. Thanks @dunkmann00.

Build and infrastructure changes

Translation additions and improvements

• Thanks for translations:
  • @MuskoM (Polish)
  • @odeevee (French)
  • @ourpxi (Spanish)
  • @supcik (French)

New boards

• senseBox-eye ESP32S3. #10523. Thanks @sensebox.
• Waveshare ESP32-S3-LCD-1.47. #10509. Thanks @liduanjun.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.0
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.

CircuitPython 10.0.0-beta.0

This is CircuitPython 10.0.0-beta.0, a beta release for 10.0.0. It has known bugs that wil be fixed before the final release of 10.0.0.

Highlights of this release

• Increase the firmware partition size for ESP32-S2 boards with 4MB flash, allowing more features to be included. This change was made for 4MB flash ESP32-S3 boards in previous releases. Starting with this release, you must now update the TinyUF2 bootloader on all 4MB flash ESP32-S2 and ESP32-S3 boards. See below.
• Fix Espressif pulseio.PulseIn regression.

Incompatibility warnings

• You must update the TinyUF2 bootloader on all ESP32-S2 and ESP32-S3 4MB flash boards to TinyUF2 0.33.0 or later.
  • The CircuitPython UF2 builds for these boards now assume a firmware partition size of 2.8MB (double the old size), as explained here. Updating the TinyUF2 bootloader will update the partition size. Failure to update the bootloader will likely cause a UF2 load to fail: you will remain in the bootloader, with the BOOT drive showing.
  • This bootloader update is only needed for ESP32-S2 and ESP32-S3 boards with 4MB flash boards; other ESP32-S2 and ESP32-S3 boards are fine. This bootloader update is compatible with CircuitPython 9.1.0 and later.
  • The proper updated bootloader will be installed by the "OPEN INSTALLER" buttons on each board download page and is also listed in the bootloader update section on those pages.
  • If you are loading CircuitPython using a .bin file instead of a UF2, the partition table is included in the .bin, and you don't need to do anything.
• synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
• The displayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replaces displayio.Display.
  • fourwire.FourWire replaces displayio.Fourwire.
  • epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
• os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio CircuitPython library.
• sys.print_exception() is removed. Use traceback.print_exception() instead. The exception object returned by sys.exc_info() is now a traceback module compatible object.

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:

• analog: Analog Devices MAX32690
• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• espressif: ESP32-P4, ESP32-H2
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families
• zephyr: multiplatform RTOS: testing with Nordic nRF5340 and nRF54L15, Renesas RA6M5, ST STM32H7

Changes

Fixes and enhancements

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Revert most of #10397, pulseio.PulseIn DMA support on ESP32-S3, due to regressions. #10470. Thanks @bill88t.
• Expand firmware partition on ESP32-S2 boards, merging with OTA update partition. #10468. Thanks @dhalbert.

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• CRCibernetica IdeaBoard: enable BLE. #10467. Thanks @bborncr.

Documentation changes

• Fix example for sdioio. #10464. Thanks @dhalbert.

Build and infrastructure changes

• Fix capitalization of ARM GNU toolchain download tar file for .devcontainer. #10477. Thanks @bablokb.

Translation additions and improvements

• Thanks for translations:
  • @hexthat (Chinese - Hanyu Pinyin)
  • @rnirthe (Dutch)

New boards

• Elecrow CrowPanel. #9883. Thanks @ddrown.
• Noise Nugget 2040. #10369. Thanks @wee-noise-makers.
• Omnimo-nRF52840. #10056. Thanks @OmarEMbed.
• Unexpected Maker EdgeS3D. #10476. Thanks @UnexpectedMaker.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.0.0
  • 10.0.x
  • 10.x.x
  • 11.0.0
  • 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.