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

Highlights of this release

• Fix SPI DMA onatmel-samd boards, which fixes SD card mounting problems.
• Restore SD card USB presentation onatmel-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 explainedhere. 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 theBOOT drive showing.
  • This bootloader update is only needed forESP32-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 tosynthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well assynthio.Synthesizer.low_pass_filter,synthio.Synthesizer.high_pass_filter, andsynthio.Synthesizer.band_pass_filter. Coefficients frombiquad_filter_state have been moved intosynthio_biquad (biquad_filter_state is still used for input and output state).
• Thedisplayio bindings deprecated in 9.x.x have been removed:
  • busdisplay.BusDisplay replacesdisplayio.Display.
  • fourwire.FourWire replacesdisplayio.Fourwire.
  • epaperdisplay.EPaperDisplay replacesdisplayio.EPaperDisplay.
  • i2cdisplaybus.I2CDisplayBus replacesdisplayio.I2CDisplay.
• os.uname().sysname andos.uname().nodename now are set toMICROPY_HW_MCU_NAME uniformly across all ports.
• watchdog.WatchDogTimer.deinit() is removed.
• _asyncio has removedpush_head,push_sorted,pop_head. Ensure you are using the latest version of theasyncio CircuitPython library.
• sys.print_exception() is removed. Usetraceback.print_exception() instead. The exception object returned bysys.exc_info() is now atraceback module compatible object.

Download from circuitpython.org

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

Installation

To install follow the instructions in theWelcome to CircuitPython! guide. To install the latest libraries, seethis page in that guide.

Trycode.circuitpython.org orthe 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 inreadthedocs.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

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

Translation additions and improvements

New boards

Known issues

• Seehttps://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 filesare not working. This capability is currently enabled only on thewinterbloom_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 theDiscord chat to collaborate.

Contributors