CircuitPython 10.3.0-alpha.4

This is CircuitPython 10.3.0-alpha.4, an alpha release for 10.3.0. Further features, changes, and bug fixes will be added before the final release of 10.3.0.

Highlights of this release

• Add audiofilewriter.
• Add audiodelays.GranularPitchShift.
• Add sdioio, audiodelays, audiofilters, and audiofreeverb on RP2xxx.
• Add CIRCUITPY_BLE_WORKFLOW, CIRCUITPY_SAFE_MODE_DELAY, and CIRCUITPY_WIFI_HOSTNAME to settings.toml.
• Add storage.unsafe_disable_usb_drive(), to disable the USB CIRCUITPY drive after the host has mounted it.
• Lower the default WiFi power from 20 dBm to 15 dBm on all boards with chip antennas
• USB host fixes.
• Espressif BLE fixes.
• ESP-NOW works again on Espressif.
• Update TinyUSB.

Incompatibility warnings when upgrading to 10.3.0 from 10.2.x

• The baudrate specified in busio.SPI.configure() is now a ceiling, and will not be exceeded. Previously, on some ports, the actual baudrate chosen could have been the nearest available baudrate, but higher than the specified baudrate, sometimes by a substantial amount. Use SPI.frequency to fetch the actual baudrate. Limitations: On Zephyr, SPI.frequency is the specified, not the actual baudrate, and some Zephyr ports may violate the ceiling behavior.

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 (will be removed in CircuitPython 11)
• 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, running on multiple chip families

Changes since 10.3.0-alpha.3

Fixes and enhancements

• Update frozen libraries. #11129. Thanks @dhalbert.
• Add storage.unsafe_disable_usb_drive(), which disables the CIRCUITPY drive even after it was enumerated as a USB drive. The drive is marked as "not ready". This allows writing to the drive from the REPL or from code without a remount() in boot.py.
• Allow non-boot-protocol keyboards to be used with USB host. #11126. Thanks @mikeysklar.
• Do not do BLE bonding delay (blue flashes) when waking from deep sleep. #11123. Thanks @dhalbert.
• Add CIRCUITPY_BLE_WORKFLOW in settings.toml for enabling/disabling BLE workflow. #11123. Thanks @dhalbert.
• Add audiodelays.GranularPitchShift. #11121. Thanks @FoamyGuy.
• Fix handling of .. in beginning of file paths. #11113. Thanks @94xhn.
• Fix native modules (.mpy files with native machine code). #11112. Thanks @jepler.
• Improve PWMOut constructor failure error messages. #11107. Thanks @dhalbert.
• Add audiofilewriter module, an audio sink that writes to a file. #11106. Thanks @FoamyGuy.
• Update TinyUSB, including MAX3421E fix. #11093. Thanks @mikeysklar.
• Fix preserve_dios during fake deep sleep. #11087. Thanks @dhalbert.
• Fix non-looping audio playback. #11085. Thanks @dhalbert.
• busio.SPI: do not exceed specified baudrate. #11081. Thanks @dhalbert.
• Fix BLE crash on AirLift restart. #11077. Thanks @dhalbert.
• Add CIRCUITPY_SAFE_MODE_DELAY in settings.toml: sets time allowed for user-initiated safe mode during startup. #11073. Thanks @dhalbert.
• Add CIRCUITPY_WIFI_HOSTNAME in settings.toml: sets hostname prior to WiFi connect. #11072. Thanks @dhalbert.
• Improvements to I2SIn streaming protocol. #11068. Thanks @FoamyGuy.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Lower default WiFi power to from 20 dBm to 15 dBm on all boards with chip antennas. #11132. Thanks @dhalbert.
• Deinitialize espcamera I2C use properly. #11108. Thanks @dhalbert.
• Fixed GATT discovery failures: build Python objects on main task, not BLE task. #11104. Thanks @dhalbert.
• Fix I2SOut. #11083. Thanks @dhalbert.
• Wait for access point IP address to be valid. #11082. Thanks @dhalbert.
• Fixed ESP-NOW regression. #11075. Thanks @dhalbert.

i.MX

Nordic

renode

RP2xxx

• Fix USB host failures. #11130, #11120, #11117, #11114. Thanks @mikeysklar.
• Check builds for use of flash by core 1 USB host code. #11115. Thanks @mikeysklar.
• Implement sdioio. #11090. Thanks @FoamyGuy.
• Enable audiodelays, audiofilters, and audiofreeverb. #11074. Thanks @FoamyGuy.

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• LILYGO T-Dongle S3: invert brightness sense. #11092. Thanks @dhalbert.

Documentation changes

• Fix doubled backslashes in settings.toml documentation. #11119. Thanks @dhalbert.

Build and infrastructure changes

• fix CIRCUITPY_* flags that should be #if, not #ifdef. #11069. Thanks @dhalbert.

Translation additions and improvements

• Use sort-by-file instead of deprecated --sort-outputfor xgettext and mergemsg. #11107. Thanks @dhalbert.
• Translations
  • @LydoriaChan (Turkish)
  • @lydorianP (Turkish)

New boards

• PCBCupid GLYPH C3. #11096. Thanks @pcbcupid.
• PCBCupid GLYPH C6. #11100. Thanks @pcbcupid.
• PCBCupid GLYPH H2. #11101. Thanks @pcbcupid.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.3.0
  • 10.x.x
  • 11.0.0
  • long term

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 10.3.0-alpha.3

This is CircuitPython 10.3.0-alpha.3, an alpha release for 10.3.0. Further features, changes, and bug fixes will be added before the final release of 10.3.0.

Highlights of this release

• Add usb_audio.USBMicrophone and usb_audio.USBSpeaker, which provide audio source and sink USB devices.
• Add audiospeed.Resampler.
• Add audio_i2sin input audio stream; supported only on Espressif and RP2xxx.
• Fix Espressif camera support regression.
• Fix several Espressif BLE bugs.
• Other bug fixes.

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, running on multiple chip families

Changes since 10.3.0-alpha.2

Fixes and enhancements

• Add audio_i2sin on Espressif and RP2xxx. It can act as an audio stream like other audio sources. #11064, #10990. Thanks @FoamyGuy.
• Add usb_audio.USBSpeaker. #11062. Thanks @FoamyGuy.
• Add usb_audio.USBMicrophone. #11058. Thanks @FoamyGuy.
• Add audiospeed.Resampler. #11057. Thanks @relic-se.
• Allow using an I/O expander pin or a DigitalInOut for the sdcardio.SDCard chip-select pin. #11053. Thanks @bablokb.
• Fix dotclockframebuffer GPIO expander pin validation. #11028. Thanks @makermelissa.
• Add mask arg to bitmaptools.alphablend(). #11027. Thanks @makermelissa.
• Fix stereo signal processing in audiofilters.Filter. #11025. Thanks @relic-se.
• Fix audiospeed.SpeedChanger. #11022. Thanks @todbot.
• Fix filesystem incorrectly reported as read-only for web and BLE workflows. #11048. Thanks @makermelissa.
• Return HTTP 409 instead of 500 on web workflow when filesytem is read-only. #11017. Thanks @makermelissa.
• Simplify startup message printing to fix suppressing messages from boot.py on the display. #11010. Thanks @dhalbert.
• Turn on __delattr__() and __setattr__() on most boards. #11007. Thanks @dhalbert.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Fix camera support. #11059. Thanks @dhalbert.
• Turn on audiobusio.PDMIn on ESP32. Improve PDMIn documentation and compile options. #11056. Thanks @dhalbert.
• Fix crashes due to BLE reset bug on startup. #11051. Thanks @dhalbert.
• Fix slow BLE discovery. #11050. Thanks @dhalbert.
• Use a more recent cmake version. #11043. Thanks @bablokb.
• Validate arg for ParallelBus to prevent crashes. #11041. Thanks @dhalbert.
• Fix BLE advertising duration. Return bleio.adapter.connected as True earlier. #11036. Thanks @dhalbert.
• Remove obsolete lwip workaround. #11016. Thanks @dhalbert.

i.MX

Nordic

renode

RP2xxx

• Use irq_shared_handler() instead of isr_dma_0(). #11054. Thanks @dhalbert.
• Fix uses of PICO_RP2040 and PICO_RP2350 compile macros. #11019, #11014. Thanks @dhalbert.
• Switch back to using upstream Pico-PIO-USB library. #11015. Thanks @dhalbert.
• Turn off picodvi on boards without available pins. #11008. Thanks @dhalbert.

SAMx

SiLabs

Spresense

STM

Zephyr

• Pin protobuf version to prevent build issues. #11045. Thanks @tannewt.
• Update Zephyr version to post-4.4.0. #11011. Thanks @tannewt.

Individual boards

• senseBox MCU Eye: update name, pins, and flash. #11063. Thanks @sensebox.

Documentation changes

• Improve deep sleep and displayio.release_displays() documentation. #11038. Thanks @dhalbert.

Build and infrastructure changes

• Prevent duplicate builds on PR's and releases. #11046. Thanks @dhalbert.
• Fix incorrect compressed translation qstr ids. #11037. Thanks @dhalbert.

Translation additions and improvements

New boards

• PCBCupid Glyph Mini 2040. #11034. Thanks @pcbcupid.
• PCBCupid GLYPH S3. #11042. Thanks @pcbcupid.
• Waveshare ESP32-S3-Tiny-N8R8. #11033. Thanks @stolen.

Known issues

• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.
• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.3.0
  • 10.x.x
  • 11.0.0
  • long term

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 10.3.0-alpha.2

This is CircuitPython 10.3.0-alpha.2, an alpha release for 10.3.0. Further features, changes, and bug fixes will be added before the final release of 10.3.0.

Highlights of this release

• Fix crashes on certain boards with integral displays.
• Adafruit MagTag 2025: improve display quality and support new display variant.
• Add CIRCUITPY_SDCARD_USB to settings.toml to control visibility of a mounted SD card on USB.
• Support float values in settings.toml.
• Report USB MSC drives as removable media to the host.
• Update ESP-IDF to v6.0.1.
• Fix audiomixer.Mixer regressions on SAMx5x.
• STM: support audio.AudioOut, using DAC.

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, running on multiple chip families

Changes since 10.3.0-alpha.1

Fixes and enhancements

• Adafruit MagTag 2025: improve display quality. #11003, #11001. Thanks @mikeysklar.
• Update frozen libraries. #10998. Thanks @dhalbert.
• Fix crashes on boards with FourWire displays with no reset pin. #10997, #10995. Thanks @dhalbert.
• Add CIRCUITPY_SDCARD_USB to settings.toml to control SD card USB presentation. #10996. Thanks @dhalbert.
• Add support for float values in settings.toml. #10975. Thanks @dhalbert.
• Report USB MSC drives as removable media to the host. #10967. Thanks @mikeysklar.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Fix WiFi/BLE crashes after ESP-IDF v6.0.1 upgrade. #11004. Thanks @tannewt.
• Preserve alarm.sleep_memory across software resets. #10989, #10899. Thanks @lzr
• Support ESP32-P4 V1. #10986. Thanks @tannewt.
• Update ESP-IDF to v6.0.1. #10922. Thanks @tannewt.

i.MX

Nordic

renode

RP2

SAMx

• Fix audiomixer.Mixer regressions on SAMx5x. #10906. Thanks @relic-se.

SiLabs

Spresense

STM

• Support audio.AudioOut, using DAC. #10976. Thanks @ChrisNourse.

Zephyr

Individual boards

• Adafruit MagTag 2025: improve display quality, support new display variant. #11003, #10992, #10987. Thanks @mikeysklar.
• Unexpected Maker S3 D series: add board.ANTENNA_SWITCH (board.IO41). #10984. Thanks @JonNelson.

Documentation changes

Build and infrastructure changes

Translation additions and improvements

• Thanks for translations:
  • @cyphra (Spanish)

New boards

• Adafruit P4GPIO. #10986. Thanks @tannewt.
• Espressif ESP32-P4X-Function-EV. #11004. Thanks @tannewt.
• NHB Systems JL401-S3. #10997, #10977. Thanks @NHBSystems.

Known issues

• The CIRCUITPY drive is not working on at least some STM32 boards.
• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.
• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.x.x
  • 11.0.0
  • long term

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 10.2.1

This is CircuitPython 10.2.1, a bugfix revision of CircuitPython, and is a new stable release.

Highlights of this release

• Fix crashes on certain boards with integral displays.
• Adafruit MagTag 2025: improve display quality and support new display variant.

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, running on multiple chip families

Changes since 10.2.0

Fixes and enhancements

• Update frozen modules. #11001. Thanks @dhalbert.
• Fix crashes on boards with FourWire displays with no reset pin. #10995. Thanks @dhalbert.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• Adafruit MagTag 2025: improve display quality, support new display variant. #11002, #11000,. Thanks @mikeysklar.

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards

• NHB Systems JL401-S3. #10977. Thanks @NHBSystems.

Known issues

• ESP32-C6 has problems.
• The CIRCUITPY drive is not working on at least some STM32 boards.
• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.
• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.x.x
  • 11.0.0
  • long term

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 10.3.0-alpha.1

This is CircuitPython 10.3.0-alpha.1, an alpha release for 10.2.0. Further features, changes, and bug fixes will be added before the final release of 10.3.0.

Highlights of this release

• Improve SD card USB presentation on macOS.
• Prefer foo.py over foo/ package when importing, like CPython.
• Pin fixes.
• Enable gifio and `storage in Zephyr port.

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, running on multiple chip families

Changes since 10.2.0

Fixes and enhancements

• • Prefer foo.py over foo/ package when importing, like CPython. Conforms to CPython behavior. #10951. Thanks @tannewt.
• Automount SD card earlier to make USB SD card access work properly on macoS. #10963. Thanks @mikeysklar.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

• Enable gifio and storage. #10970. Thanks @FoamyGuy.

Individual boards

• Waveshare ESP32-S3 Matrix: fix pin name typo. #10971. Thanks @kylefmohr.

Documentation changes

Build and infrastructure changes

Translation additions and improvements

• Thanks for translations:
  • @andibing (English - UK)

New boards

Known issues

• ESP32-C6 networking is not working well.
• The CIRCUITPY drive is not working on at least some STM32 boards.
• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.
• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.x.x
  • 11.0.0
  • long term

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 10.2.0

This is CircuitPython 10.2.0, a minor revision of CircuitPython, and is a new stable release.

Highlights of this release

• New audiotools.SpeedChanger.
• New qspibus support for displayio.
• Stability improvements to USB SD card handling.
• Merge of MicroPython v1.27.
• Update to ESP-IDF v5.5.3.
• Many additions to the Zephyr port.
• Simulated hardware testing is now being done in the Zephyr port.

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, running on multiple chip families

Changes since 10.1.4 and 10.2.0-alpha.1

Fixes and enhancements

• Fix web workflow background callback handling. #10966. Thanks @dhalbert.
• Fix sdcardio.SDCard regression that failed to init some cards. #10956. Thanks @dhalbert and @bablokb.
• Update frozen libraries. #10945, #10853, Thanks @dhalbert and @FoamyGuy.
• Merge MicroPython v1.27 into CircuitPython. #10931. Thanks @dhalbert.
• Fix palette length validation in _stage. #10904. Thanks @deshipu.
• Add audiotools.SpeedChanger. #10900. Thanks @todbot.
• Add mcp4822 SPI DAC support. #10895. Thanks @todbot.
• Improve USB SD presentation, sdcardio implementation, displayio bus sharing. #10887. Thanks @dhalbert.
• Add arg validations in various bitmaptools methods. #10884. Thanks @FoamyGuy.
• Merge 10.1.x fixes. #10877, #10839. Thanks @dhalbert.
• Fix handling of full-width glyphs in lvfontio. #10865. Thanks @FoamyGuy.
• Added displayio qspibus support. #10844. Thanks @ppsx.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Change USB task priority to be the same as the CircuitPython task. #10887. Thanks @dhalbert.
• Fix BLE startup crash. #10858. Thanks @tannewt.
• Update to ESP-IDF 5.5.3. #10840. Thanks @tannewt.

i.MX

Nordic

renode

RP2

• Fix i2ctarget bugs. #10933. Thanks @FoamyGuy.
• Fix i2ctarget start bug. #10474. Thanks @MarkEbrahim.

SAMx

SiLabs

Spresense

STM

• Move SPI deinit code to prevent crash. #10926. Thanks @ChrisNourse.

Zephyr

• Fix flash size on Feather RP240. #10960. Thanks @FoamyGuy.
• Enable jpegio, getpass, adafruit_bus_device, hashlib, zlib, aesio, msgpack. #10952, #10949, #10943, #10939, #10932, #10927. Thanks @FoamyGuy.
• Add nvm support. #10918. Thanks @tannewt.
• Add Adafruit Feather RP240. #10925. Thanks @FoamyGuy.
• Add Adafruit Feather nRF2840 Sense. #10923. Thanks @tannewt.
• Add Raspberry Pi Pico, Pico W, Pico2, Pico2 W. #10917. Thanks @tannewt.
• add audiobusio.I2SOut support. #10916. Thanks @tannewt.
• Zephyr port and build fixes. #10912, #10911, #10863, #10860, #10859. Thanks @tannewt.
• Allow building and uploading native_sim .exe. #10897. Thanks @tannewt.
• Add heap statistics tracking to native_sim. #10869. Thanks @tannewt.
• Add zephyr_display to support fixed Zephyr displays. #10868. Thanks @tannewt.
• Implement _bleio scanning, advertising, connect, and disconnect. #10862, #10833. Thanks @tannewt.
• Add TCP neworking support. #10847. Thanks @tannewt.
• Test simulated hardware using perfetto traces. #10846. Thanks @tannewt.
• Handle time simulation without using yields. #10834. Thanks @tannewt.

Individual boards

• Adafruit QT Py ESP32-S3 4/2 and 8/0: reduce default WiFi power to 15 dBm. #10921. Thanks @jesseadams.
• Cytron Maker Pi RP2040: add GP29 pin definitions. #10893. Thanks @CytronTechnologies.
• uGame S3: slow down SPI to avoid display glitches. #10837. Thanks @deshipu.

Documentation changes

• Fix typo in tim.monotonic_ns(). #10950. Thanks @tannewt.
• Explain SD card initialization more thoroughly. #10962, #10947. Thanks @mikeysklar.
• Correct return type in busio.I2C.probe(). #10891. Thanks @FoamyGuy.

Build and infrastructure changes

• Update CI actions to Node.24 versions. #10910. Thanks @dhalbert.
• Fix ReadTheDocs build warnings. #10907. Thanks @dhalbert.
• Add support for user-supplied build configuration files: user_pre_mpconfigport.mk, user_post_mpconfigport.mk, user_post_circuitpy_defns.mk. #10817. Thanks @bablokb.

Translation additions and improvements

New boards

• Pimoroni Badger2350. #10929. Thanks @bablokb.
• Pimoroni Explorer RP2350. #10778. Thanks @tyeth.
• TinyCircuits Thumby and Thumby Color. #10851, #10303. Thanks @tannewt.
• Waveshare ESP32-S# Touch AMOLED 2.41". #10844. Thanks @ppsx.
• WeAct Studio RP2350B Core. #10646. Thanks @cvmanjoo.
• Xteink X4. #10873. Thanks @BlitzCityDIY.

Known issues

• ESP32-C6 networking is not working well.
• The CIRCUITPY drive is not working on at least some STM32 boards.
• Native-code .mpy files are not working. This capability is currently enabled only on the winterbloom_sol board.
• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.x
  • 10.x.x
  • 11.0.0
  • long term

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 10.2.0-rc.0

This is CircuitPython 10.2.0-rc.0, a release candidate for CircuitPython 10.2.0 final. CircuitPython 10.2.0 will be the latest minor revision of CircuitPython, and will be a new stable release.

Highlights of this release

• New audiotools.SpeedChanger.
• New qspibus support for displayio.
• Stability improvements to USB SD card handling.
• Merge of MicroPython v1.27.
• Update to ESP-IDF v5.5.3.
• Many additions to the Zephyr port.
• Simulated hardware testing is now being done in the Zephyr port.

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, running on multiple chip families

Changes

Fixes and enhancements

• Update frozen libraries. #10945, #10853, Thanks @dhalbert and @FoamyGuy.
• Merge MicroPython v1.27 into CircuitPython. #10931. Thanks @dhalbert.
• Fix palette length validation in _stage. #10904. Thanks @deshipu.
• Add audiotools.SpeedChanger. #10900. Thanks @todbot.
• Add mcp4822 SPI DAC support. #10895. Thanks @todbot.
• Improve USB SD presentation, sdcardio implementation, displayio bus sharing. #10887. Thanks @dhalbert.
• Add arg validations in various bitmaptools methods. #10884. Thanks @FoamyGuy.
• Merge 10.1.x fixes. #10877, #10839. Thanks @dhalbert.
• Fix handling of full-width glyphs in lvfontio. #10865. Thanks @FoamyGuy.
• Added displayio qspibus support. #10844. Thanks @ppsx.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• Change USB task priority to be the same as the CircuitPython task. #10887. Thanks @dhalbert.
• Fix BLE startup crash. #10858. Thanks @tannewt.
• Update to ESP-IDF 5.5.3. #10840. Thanks @tannewt.

i.MX

Nordic

renode

RP2

• Fix i2ctarget bugs. #10933. Thanks @FoamyGuy.
• Fix i2ctarget start bug. #10474. Thanks @MarkEbrahim.

SAMx

SiLabs

Spresense

STM

• Move SPI deinit code to prevent crash. #10926. Thanks @ChrisNourse.

Zephyr

• Enable adafruit_bus_device, hashlib, zlib, aesio, msgpack. #10943, #10939, #10932, #10927. Thanks @FoamyGuy.
• Add nvm support. #10918. Thanks @tannewt.
• Add Adafruit Feather RP240. #10925. Thanks @FoamyGuy.
• Add Adafruit Feather nRF2840 Sense. #10923. Thanks @tannewt.
• Add Raspberry Pi Pico, Pico W, Pico2, Pico2 W. #10917. Thanks @tannewt.
• add audiobusio.I2SOut support. #10916. Thanks @tannewt.
• Zephyr port and build fixes. #10912, #10911, #10863, #10860, #10859. Thanks @tannewt.
• Allow building and uploading native_sim .exe. #10897. Thanks @tannewt.
• Add heap statistics tracking to native_sim. #10869. Thanks @tannewt.
• Add zephyr_display to support fixed Zephyr displays. #10868. Thanks @tannewt.
• Implement _bleio scanning, advertising, connect, and disconnect. #10862, #10833. Thanks @tannewt.
• Add TCP neworking support. #10847. Thanks @tannewt.
• Test simulated hardware using perfetto traces. #10846. Thanks @tannewt.
• Handle time simulation wihtout using yields. #10834. Thanks @tannewt.

Individual boards

• Adafruit QT Py ESP32-S3 4/2 and 8/0: reduce default WiFi power to 15 dBm. #10921. Thanks @jesseadams.
• Cytron Maker Pi RP2040: add GP29 pin definitions. #10893. Thanks @CytronTechnologies.
• uGame S3: slow down SPI to avoid display glitches. #10837. Thanks @deshipu.

Documentation changes

• Explain SD card initialization more thoroughly. #10947. Thanks @mikeysklar.
• Correct return type in busio.I2C.probe(). #10891. Thanks @FoamyGuy.

Build and infrastructure changes

• Update CI actions to Node.24 versions. #10910. Thanks @dhalbert.
• Fix ReadTheDocs build warnings. #10907. Thanks @dhalbert.
• Add support for user-supplied build configuration files: user_pre_mpconfigport.mk, user_post_mpconfigport.mk, user_post_circuitpy_defns.mk. #10817. Thanks @bablokb.

Translation additions and improvements

New boards

• Pimoroni Badger2350. #10929. Thanks @bablokb.
• Pimoroni Explorer RP2350. #10778. Thanks @tyeth.
• TinyCircuits Thumby and Thumby Color. #10851, #10303. Thanks @tannewt.
• Waveshare ESP32-S# Touch AMOLED 2.41". #10844. Thanks @ppsx.
• WeAct Studio RP2350B Core. #10646. Thanks @cvmanjoo.
• Xteink X4. #10873. Thanks @BlitzCityDIY.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.2.0
  • 10.2.x
  • 10.x.x
  • 11.0.0
  • long term\
• The CIRCUITPY drive is not working on at least some STM32 boards.
• 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 10.1.4

This is CircuitPython 10.1.4, the latest bugfix revision of CircuitPython, and is a new stable release.

Highlights of this release

• Fix pin-reset regression which caused display problems on some boards.
• Fix object creation and deinitialization problems, most notably when SPI was used for displays on SAMD.

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, nRF54H20, nRF54L15, nRF7002; NXP i.MX RT1170, MCXN947; Renesas RA6M5, RA8D1; ST STM32H7, STM32N657, STM32U7,

Changes

Fixes and enhancements

• Allocate objects only after all validations are complete. This is safer for finalisers. #10872. Thanks @dhalbert.
• Reset all pins early on startup, and after VM shuts down. This fixes a regression which caused display problems on some boards. #10843. Thanks @dhalbert.

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

SAMx

• Fix busio.SPI deinit to mark as deinited only after freeing SCK pin. #10874. Thanks @dhalbert.

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:
  • 10.1.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 10.1.3

This is CircuitPython 10.1.3, the latest bugfix revision of CircuitPython, and is a new stable release.

(The 10.1.2 release was discarded due to incorrect tagging.)

Highlights of this release

• Adafruit MagTag: auto-detect different versions of e-ink display on 2025 MagTag.
• Espressif: fix board I2C object deinit(). Fixes crash with Adafruit Qualia library.

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, nRF54H20, nRF54L15, nRF7002; NXP i.MX RT1170, MCXN947; Renesas RA6M5, RA8D1; ST STM32H7, STM32N657, STM32U7,

Changes

Fixes and enhancements

Port and board-specific changes

Analog Devices

Broadcom

Espressif

• busio.I2C: Check if already deinited in unlock(). Fixes crash with board I2C objects. #10838. Thanks @dhalbert and thanks @rsbohn for issue.

i.MX

Nordic

renode

RP2

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

• Adafruit MagTag: Auto-detect variations in e-ink display model on 2025 MagTag. #10836. Thanks @dhalbert and thanks @caternuson, @Timeline8, and @grgrant for diagnosis and testing.

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:
  • 10.1.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 10.2.0-alpha.1

This is CircuitPython 10.2.0-alpha.1, an alpha release for 10.2.0. Further features, changes, and bug fixes will be added before the final release of 10.2.0.

Highlights of this release

• Include 10.1.1 fix for performance regression.
• Better entropy for RP2350 os.urandom().
• Add supervisor.get_setting(), which retrieves a string, boolean, or integer typed value from settings.toml.

Notable changes in 10.2.0 from 10.1.x

• os.getenv() always returns a string.
• Add supervisor.get_setting(), which retrieves a string, boolean, or integer typed value from settings.toml.

Incompatibility warnings when upgrading to 10.2.0

• os.getenv() now always returns a string, instead of returning an int when the value could be parsed as such.

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, nRF54H20, nRF54L15, nRF7002; NXP i.MX RT1170, MCXN947; Renesas RA6M5, RA8D1; ST STM32H7, STM32N657, STM32U7,

Changes

Fixes and enhancements

• Call port_yield() from background task only in zephyr builds right now. #10829, #10824. Thanks @daniel-alsen for discovery and diagnosis, and @dhalbert for PR.
• os.getenv() now always returns a str from settings.toml. A new function supervisor.get_setting() returns a bool, int, or str, as appropriate. #10819. Thanks @dhalbert

Port and board-specific changes

Analog Devices

Broadcom

Espressif

i.MX

Nordic

renode

RP2

• RP2350: Use the TRNG (True Random Number Generator) as an additional source of entropy for os.urandom(). #10826. Thanks @mimi89999.

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

Documentation changes

Build and infrastructure changes

• Update to ARM gcc 15.2Rel1 toolchain. @10825. Thanks @dhalbert.

Translation additions and improvements

• @arifpedia (Indonesian). Thanks for extensive additions. Indonesian is now a complete translation.

New boards

• deshipu UGameS3. #10815. Thanks @deshipu.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 10.1.x
  • 10.2.0
  • 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.