CircuitPython 9.1.1

This is CircuitPython 9.1.1, 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.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0

Fixes and enhancements

Port and board-specific changes

Broadcom

Espressif

i.MX

nordic

• Fix BLE MTU negotiation. #9441. Thanks @dhalbert.

renode

RP2040

• Check that all busio.UART pins are valid before claiming any. #9425. Thanks @jepler.

SAMx

• SAMD51: fix PWMOut by reverting #9343: symptoms included no backlight on boards with displays. #9447. Thanks @dhalbert.

SiLabs

Spresense

STM

Individual boards

Documentation changes

Build and infrastructure changes

• Exclude circuitpython-stubs when building documentation. #9431. Thanks @jepler.

Translation additions and improvements

New boards since 9.1.0

Known issues

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

Thanks

Thank you to all who used, tested, and contributed since 9.1.0, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.1.0

This is CircuitPython 9.1.0, the latest minor 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.

Notable changes since 9.0.0

Incompatibility warnings

• API changes to floppyio.
• String values in settings.toml must be quoted.

Audio

• RP2040 I2SOut supports BLCK and LRCLK in either order.
• ESP32-S3 supports audiomp3.
• audiomp3 supports streaming from HTTP servers.

Bluetooth

• BLE GATT server support on Espressif.
• Pairing and bonding support on Espressif.

Built-in modules

• Enhance collections.deque functionality.
• Add keypad_demux.DemuxKeyMatrix: use multiplexer for one side of a keypad matrix.
• Add integration-based debouncing to keypad.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool.
• Incompatible change: floppyio improvements, including API changes.
• Espressif: microcontroller.cpu.frequency is settable.

Graphics

• fourwire.FourWire: chip_select pin is now optional.
• picodvi now supports 640x240 and 800x240 resolutions.
• Enable _eve on Espressif boards with more than 4MB flash.

Internal

• Espressif: update to ESP-IDF v5.2.2.
• Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.

Networking

• Implement ssl module for anything that provides socket.
• Add stream protocol support to SSLSocket.

Ports

• New port for renode hardware simulator.

Power

• Enable deep sleep on all supported Espressif chips.

Supervisor

• String values in settings.toml must be quoted.

USB

• max3421e USB host support.
• Allow user-specified names for usb_midi interfaces and jacks.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0-rc.0

This release is a relabeling of 9.1.0-rc.0 and is otherwise identical to that release.

Known issues

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

Thanks

Thank you to all who used, tested, and contributed since 9.1.0-beta.4, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.1.0-rc.0

This is CircuitPython 9.1.0-rc.0, a release candidate for 9.1.0 final. This release is believed to be stable, and is meant for testing before the final release of 9.1.0.

WARNING for nRF52 boards only: If your board has an nRF52 UF2 bootloader whose version is before 0.6.1, you will not be able to load CircuitPython 8.2.0 and later, due to increased size of the firmware. See these instructions for updating your bootloader.

Notable changes since 9.0.0

Incompatibility warnings

• API changes to floppyio.
• String values in settings.toml must be quoted.

Audio

• RP2040 I2SOut supports BLCK and LRCLK in either order.
• ESP32-S3 supports audiomp3.
• audiomp3 supports streaming from HTTP servers.

Bluetooth

• BLE GATT server support on Espressif.
• Pairing and bonding support on Espressif.

Built-in modules

• Enhance collections.deque functionality.
• Add keypad_demux.DemuxKeyMatrix: use multiplexer for one side of a keypad matrix.
• Add integration-based debouncing to keypad.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool.
• Incompatible change: floppyio improvements, including API changes.
• Espressif: microcontroller.cpu.frequency is settable.

Graphics

• fourwire.FourWire: chip_select pin is now optional.
• picodvi now supports 640x240 and 800x240 resolutions.
• Enable _eve on Espressif boards with more than 4MB flash.

Internal

• Espressif: update to ESP-IDF v5.2.2.
• Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.

Networking

• Implement ssl module for anything that provides socket.
• Add stream protocol support to SSLSocket.

Ports

• New port for renode hardware simulator.

Power

• Enable deep sleep on all supported Espressif chips.

Supervisor

• String values in settings.toml must be quoted.

USB

• max3421e USB host support.
• Allow user-specified names for usb_midi interfaces and jacks.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0-beta.4

Fixes and enhancements

• Update frozen libraries. #9422. Thanks @dhalbert.
• sdcardio.SDCard: fix crashes after deinit. #9418. Thanks @dhalbert.

Port and board-specific changes

Broadcom

Espressif

• Add ringbuf atomicity for USB/JTAG serial operations. #9409. Thanks @dhalbert.
• Espressif: microcontroller.cpu.frequency is now settable. #9432. Thanks @Sola85.

i.MX

nordic

renode

RP2040

SAMx

SiLabs

Spresense

STM

Individual boards

• 8086 USB Interposer: fix pin name. #9403. Thanks @burtyb.
• Maple Elite-Pi: correct flash chip. #9419. Thanks @dhalbert.
• M5Stack Dial: fix I2C pin naming. #9404. Thanks @mumin50 and @CDarius.

Documentation changes

• Fix example in sdioio. #9415. Thanks @RetiredWizard.

Build and infrastructure changes

• Fix missing pins in board-specific stubs. #9410. Thanks @elpekenin.

Translation additions and improvements

• Thanks for translations:
  • @wtuemura (Portuguese - Brazil)

New boards since 9.1.0-beta.4

• LILYGO T-Display S3 Pro. #9414, #9405. Thanks @dikei100.
• Waveshare RP2040-PiZero. #9408. Thanks @CDarius.

Known issues

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

Thanks

Thank you to all who used, tested, and contributed since 9.1.0-beta.4, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.1.0-beta.4

This is CircuitPython 9.1.0-beta.4, a beta for CircuitPython 9.1.0, and is a new unstable release. This release has known bugs that will be addressed before 9.1.0 final.

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.

Notable changes since 9.0.0

Incompatibility warnings

• API changes to floppyio.
• String values in settings.toml must be quoted.

Audio

• RP2040 I2SOut supports BLCK and LRCLK in either order.
• ESP32-S3 supports audiomp3.
• audiomp3 supports streaming from HTTP servers.

Bluetooth

• BLE GATT server support on Espressif.
• Pairing and bonding support on Espressif.

Built-in modules

• Enhance collections.deque functionality.
• Add keypad_demux.DemuxKeyMatrix: use multiplexer for one side of a keypad matrix.
• Add integration-based debouncing to keypad.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool.
• Incompatible change: floppyio improvements, including API changes.

Graphics

• fourwire.FourWire: chip_select pin is now optional.
• picodvi now supports 640x240 and 800x240 resolutions.
• Enable _eve on Espressif boards with more than 4MB flash.

Internal

• Espressif: update to ESP-IDF v5.2.2.
• Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.

Networking

• Implement ssl module for anything that provides socket.
• Add stream protocol support to SSLSocket.

Ports

• New port for renode hardware simulator.

Power

• Enable deep sleep on all supported Espressif chips.

Supervisor

• String values in settings.toml must be quoted.

USB

• max3421e USB host support.
• Allow user-specified names for usb_midi interfaces and jacks.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0-beta.3

Fixes and enhancements

• Correct count of available incoming serial bytes. #9400. Thanks @jepler.
• Update frozen libraries. #9397. Thanks @dhalbert.
• Fix OUT USB HID report handling. #9322. Thanks @dhalbert.
• Add stream protocol support to SSLSocket. #9318. Thanks @jepler.
• Fix file path handling errors in remote workflows. #9314, #9311. Thanks @dhalbert.
• Fix EPaperDisplay.time_to_refresh(). #9299. Thanks @tannewt.
• Fix espulp and support both FSM and RISCV when available. #9277. Thanks @Sola85.

Port and board-specific changes

Broadcom

Espressif

• Fix BLE advertising timeout and slowdown. #9395. Thanks @dhalbert.
• Fix several BLE bugs. #9374. Thanks @dhalbert.
• Provide a setting for maximum wifi power and adjust on several boards. #9369, #9364. Thanks @bill88t and @karlfl.
• Prevent errors when using ping by adding a delay when necessary. #9350. Thanks @dhalbert.
• Start BLE for workflow only when desired. #9344. Thanks @tannewt.
• Finish BLE GATT server support. #9325. Thanks @tannewt.
• Upgrade to ESP-IDF v5.2.2. #9325. Thanks @tannewt.
• Enable deep sleep on all supported Espressif chips. #9324. Thanks @tannewt.
• Support BLE pairing and bonding. #9289. Thanks @tannewt.
• Enable _eve on Espressif boards with more than 4MB flash. #9243. Thanks @Bridgetek.

i.MX

nordic

• Fix BLE event handler garbage collection. #9285. Thanks @dhalbert.

renode

RP2040

• Fix off-by-one errors affecting PWM frequeny. #9398. Thanks @timchinowsky.
• Fix accuracy of ADC sample rate for analogbufio. #9396. Thanks @timchinowsky.
• Pico W: turn off USB host and DVI support to regain RAM space. #9303. Thanks @dhalbert.

SAMx

• Fix PWM delays and rounding. #9343. Thanks @timchinowsky.

SiLabs

Spresense

STM

Individual boards

• Adafruit Feather ESP32-S2 and ESP32-S3 Reverse Feathers: use correct display power pin. #9346. Thanks @lewinski.
• Bradan Lane RP2040 Explorer Badge: reassign UART pins to IR; add frozen modules. #9389. Thanks @bradanlane.
• Espressif ESP32-S3-DevKitM-1: Add missing pins. #9287. Thanks @fetsnleds.
• M5Stack Cardputer improvements: #9280, #9273. Thanks @bill88t.
• Seeed WIO Terminal: add explanatory comments in pins.c. #9371. Thanks @stonehippo.
• Sunton ESP32 2432S028: rotate display. #9340. Thanks @occasional-contributor.

Documentation changes

• Update espressif README. #9309. Thanks @bill88t.
• Update AnalogIn limitations for Espressif. #9272. Thanks @dhalbert.

Build and infrastructure changes

• Use macOS 12 for mpy-cross builds. #9388, #9329. Thanks @jepler.
• Use Python 3.9 or higher for circuitpython_setboard. #9368. Thanks @FoamyGuy.
• Fix custom board build available via GitHub web. #9298, #9293. Thanks @tyeth.
• Use uncrustify from PyPi micropython-uncrustify. #9295. Thanks @dhalbert.
• Remove unused global board_display_obj. #9294. Thanks @bablokb.
• Generate CSV tables of board details. #9278. Thanks @timchinowsky.

Translation additions and improvements

• Thanks for translations:
  • @andibing (English - UK)
  • @hacimuhammed (Turkish)
  • @hexthat (Chinese - Pinyin)
  • @johnnohj (English - UK, German)
  • @kerem3338 (Turkish)
  • @wtuemura (Portuguese - Brazil)
  • @Xfox20 (German)

New boards since 9.1.0-beta.3

• 8086 USB Interposer. #9401. Thanks @burtyb
• Adafruit Feather RP2040 Adalogger. #9290. Thanks @dhalbert.
• ARCHI NEWSAN: #9387, #9353. Thanks @EricAlmendras.
• Arduino Nano 33 BLE Rev2. #9347. Thanks @applecuckoo.
• AutosportLabs ESP32-CAN-X2. #9281. Thanks @autosportlabs.
• Espressif ESP32 TTGO T8 v1.7. #9391. Thanks @aguaviva.
• NodeMcu ESP32-C2. #9300. Thanks @bill88t.
• Oak Dev Tech RPGA Feather. #9292. THanks @skerr92.
• Seeed Xiao ESP32C6. #9326. Thanks @MatthewJeffson.
• Sunton ESP32 2432S032C with 3.2in display. #9316. Thanks @bablokb.
• ThingPulse Pendrive S3. #9296. Thanks @squix78.
• UnexpectedMaker FeatherS3 Neo. #9307. Thanks @UnexpectedMaker.
• Waveshare ESP32-S3-Tiny. #9274. Thanks @kylefmohr.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.1.0-beta.3, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.1.0-beta.3

This is CircuitPython 9.1.0-beta.3, a beta for CircuitPython 9.1.0, and is a new unstable release. This release has known bugs that will be addressed before 9.1.0 final.

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.

Notable changes since 9.0.0

Incompatibility warnings

• API changes to floppyio.
• String values in settings.toml must be quoted.

Audio

• RP2040 I2SOut supports BLCK and LRCLK in either order.
• ESP32-S3 supports audiomp3.

Bluetooth

• Initial implementation of BLE GATT server support on Espressif chips. Pairing/bonding is not yet implemented.

Built-in modules

• Enhance collections.deque functionality.
• Add keypad_demux.DemuxKeyMatrix: use multiplexer for one side of a keypad matrix.
• Add integration-based debouncing to keypad.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool.
• Incompatible change: floppyio improvements, including API changes.

Graphics

• fourwire.FourWire: chip_select pin is now optional.
• picodvi now supports 640x240 and 800x240 resolutions.

Internal

• Espressif: update to ESP-IDF v5.2.1.
• Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.

Networking

• Implement ssl module for anything that provides socket.

Ports

• New port for renode hardware simulator.

Supervisor

• String values in settings.toml must be quoted.

USB

• max3421e USB host support.
• Allow user-specified names for usb_midi interfaces and jacks.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0-beta.2

Fixes and enhancements

• Update frozen libraries. In particular, fixes an issue introduced in 9.1.0-beta.2 with the adafruit_esp32spi library. #9271. Thanks @dhalbert.
• Fix exception chaining for non-built-in exceptions #9269, #9266. Thanks @jepler.
• Update TinyUSB; includes USB host fixes. #9252. Thanks @todbot.
• Calculate synthio.LFO.value at construction. #9247. Thanks @jepler.

Port and board-specific changes

Broadcom

Espressif

• Initial implementation of BLE GATT server support on Espressif chips. Pairing/bonding is not yet implemented. #9222. Thanks @tannewt.

i.MX

nordic

renode

RP2040

• Pico W: set socket connected status after UDP and raw connect. #9251. Thanks @jepler.

SAMx

SiLabs

Spresense

STM

Individual boards

• Espressif ESP2-S3-DevKitM-1: add GPIO34 pin. #9259. Thanks @fetsnleds.
• M5Stack CoreS3: enable on-board camera and microphone. #9255. Thanks @CDarius.

Documentation changes

Build and infrastructure changes

• Use raw strings for Python regular expressions. #9267. Thanks @dhalbert.
• Replace all uses of STATIC with static in CircuitPython-only C source files. #9263. Thanks @dhalbert.
• Replace include guards with #pragma once in CircuitPython-only C header files. #9262, #9260. Thanks @dhalbert.
• Mark all CircuitPython-only C sources files as being part of the CircuitPython project. Change to use SPDX for copyright lines and licenses for these files. Remove in-line MIT license text. Add headers to files that did not have them. #9257. Thanks @dhalbert.

Translation additions and improvements

New boards since 9.1.0-beta.2

• Bradán Lane STUDIO Explorer Badge. #9256. Thanks @bradanlane.
• Freenove ESP32-WROVER-DEV-CAM (and other similar generic boards). #9233. Thanks @gitcnd.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.1.0-beta.2, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.0.5

This is CircuitPython 9.0.5, the latest bugfix release 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.

For notable changes to 9.0.0 since 8.x.x, see the 9.0.0 release notes.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6
• nrf: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.0.4

Fixes and enhancements

• Fix exception chaining for non-built-in exceptions. #9266. Thanks @jepler.

Port and board-specific changes

Broadcom

Espressif

i.MX

nRF

RP2040

SAMx

SiLabs

Spresense

STM

Individual boards

• Waveshare RP2040-GEEK: fix pin names to match board. #9200. Thanks @RetiredWizard.

Documentation changes

Build and infrastructure changes

• Fix local and ReadTheDocs documentation builds. #9185. Thanks @dhalbert.

Translation additions and improvements

New boards since 9.0.4

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.0.4, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.1.0-beta.2

This is CircuitPython 9.1.0-beta.2, a beta for CircuitPython 9.1.0, and is a new unstable release. This release has known bugs that will be addressed before 9.1.0 final.

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.

Notable changes since 9.0.0

Incompatibility warnings

• API changes to floppyio.
• String values in settings.toml must be quoted.

Audio

• RP2040 I2SOut supports BLCK and LRCLK in either order.
• ESP32-S3 supports audiomp3.

Built-in modules

• Enhance collections.deque functionality.
• Add keypad_demux.DemuxKeyMatrix: use multiplexer for one side of a keypad matrix.
• Add integration-based debouncing to keypad.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool.
• Incompatible change: floppyio improvements, including API changes.

Graphics

• fourwire.FourWire: chip_select pin is now optional.
• picodvi now supports 640x240 and 800x240 resolutions.

Internal

• Espressif: update to ESP-IDF v5.2.1.
• Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.

Networking

• Implement ssl module for anything that provides socket.

Ports

• New port for renode hardware simulator.

Supervisor

• String values in settings.toml must be quoted.

USB

• max3421e USB host support.
• Allow user-specified names for usb_midi interfaces and jacks.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C3
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• renode: hardware simulator
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0-beta.1

Fixes and enhancements

• Update frozen libraries. #9250. Thanks @dhalbert.
• Implement ssl module for anything that provides socket. #8954. Thanks @jepler.
• Make sure the os.getcwd() is / after VM restart. #9224. Thanks @bill88t.

Port and board-specific changes

Broadcom

Espressif

• Enable audiomp3 on ESP32-S3. #9218. Thanks @jepler.
• Allow user-specified socket connect timeout. #9210. Thanks @dhalbert.
• Use -Os for all 4MB builds, to save space. #9207. Thanks @tannewt.
• Clear UART input buffer on creation, to avoid stray junk bytes. #9193. Thanks @dhalbert.

i.MX

nordic

renode

• New port for renode simulator. #9199. Thanks @tannewt.

RP2040

• Fix I2CTarget restart requests. #9236. Thanks @mirskytech.
• Improve time.monotonic_ns() resolution by adding subticks internally. #9229. Thanks @timchinowsky.

SAMx

SiLabs

Spresense

STM

Individual boards

• Adafruit Feather nRF52840: add board.NEOPIXEL_POWER support, available in board Rev E. #9246. Thanks @dhalbert.
• Challenger RP2040 LTE: Fix pin assignment. #9249. Thanks @mirskytech.
• M5Stack AtomS3U: fix pin typo. #9212. Thanks @n3o59hf.
• Waveshare ESP32-S3-GEEK: update pin names: #9194. Thanks @RetiredWizard.
• Waveshare RP2040-GEEK: update pin names: #9194. Thanks @RetiredWizard.

Documentation changes

• Fix typos in _bleio.Adapter.start_advertising() documentation. #9248. Thanks @andrewguest.
• Improve I2CTarget documentation. #9236. Thanks @mirskytech.

Build and infrastructure changes

• Add Adafruit_CircuitPython_Bitmap_Fonts to frozen libraries. #9202. Thanks @bradanlane.

Translation additions and improvements

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

New boards since 9.1.0-beta.1

• Adafruit Pixel Trinkey M0. #9189. Thanks @dhalbert.
• Adafruit TRRS Trinkey M0. #9190. Thanks @dhalbert.
• AI-Thinker ESP32-CAM. #9231. Thanks @gitcnd.
• Spotpear ESP32C3 with 1.44" LCD. #9210. Thanks @SeanTheITGuy.
• Waveshare ESP32S3 LCD 1.28". #9205, #9192. Thanks @SeanTheITGuy and @bill88t.
• WEMOS LOLIN32 Lite. #9206. Thanks @bill88t.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.1.0-beta.1, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.1.0-beta.1

This is CircuitPython 9.1.0-beta.1, a beta for CircuitPython 9.1.0, and is a new unstable release. This release has known bugs that will be addressed before 9.1.0 final.

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.

Notable changes since 9.0.0

Incompatibility warnings

• API changes to floppyio.
• String values in settings.toml must be quoted.

Audio

• RP2040 I2SOut supports BLCK and LRCLK in either order.

Built-in modules

• Enhance collections.deque functionality.
• Add keypad_demux.DemuxKeyMatrix: use multiplexer for one side of a keypad matrix.
• Add integration-based debouncing to keypad.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool.
• Incompatible change: floppyio improvements, including API changes.

Graphics

• fourwire.FourWire: chip_select pin is now optional.
• picodvi now supports 640x240 and 800x240 resolutions.

Internal

• Espressif: update to ESP-IDF v5.2.1.
• Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.

Supervisor

• String values in settings.toml must be quoted.

USB

• max3421e USB host support.
• Allow user-specified names for usb_midi interfaces and jacks.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C3
• nordic: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.1.0-beta.0

Fixes and enhancements

• Update frozen libraries. #9188. Thanks @dhalbert.
• External flash cache allocation crashed into safe mode when heap was too small. #9187, #9169. Thanks @dhalbert.
• Avoid putting terminal escape sequences in boot_out.txt. #9181. Thanks @bill88t.
• MAX3421E USB host support. #9164. Thanks @tannewt.
• Enable bitmapfilter on boards where it will fit. #9156. Thanks @dhalbert.
• Allow user-specified names for usb_midi interfaces and jacks. #9146. Thanks @brushmate.
• supervisor.Runtime.serial_bytes_available now returns a count instead of a bool. #9141. Thanks @dhalbert
• Correct EPaperDisplay.time_to_refresh. #9140. Thanks @elpekenin.
• floppyio improvements, including API changes. #9135. Thanks @jepler.
• Require strings to be quoted in settings.toml #9117. Thanks @jepler.
• fourwire.FourWire: chip_select pin is now optional. #9106. Thanks @wee-noise-makers.

Port and board-specific changes

Broadcom

Espressif

• Document Espressif AnalogIn limitations. #9137. Thanks @dhalbert.
• Change task-switching quantum to 1 millisecond from 10 milliseconds. #9134. Thanks @dhalbert.
• Handle new ESP-IDF v5.2.1 failure codes for WiFi connections. #9126. Thanks @dhalbert.

i.MX

nordic

• Fix AnalogIn. #9187, #9161, #9114. Thanks @dhalbert.
• Move state word that survives reset to avoid its being overwritten by bootloader. #9160. Thanks @tannewt.

RP2040

• Disable picodvi and usb_host on boards that cannot use them. #9116. Thanks @bablokb.
• picodvi now supports 640x240 and 800x240 resolutions. #9102. Thanks @jepler.

SAMx

• Fix AudioOut timer allocation. #9165. Thanks @dhalbert.

SiLabs

Spresense

STM

Individual boards

• FireBeetle 2 ESP32-S3: fix reset. #9170. Thanks @bill88t.
• ESP32-S3 HackTablet: initialize display. #9157. Thanks @RetiredWizard.
• M5Stack Cardputer: allow input from Cardputer keyboard. #9145. Thanks @joshua-beck-0908.
• Pimoroni InkyFrame 5.7": several updates. #7997. Thanks @bablokb.
• senseBox MCU-S2 ESP32S2: busio.I2C: allow GPIO45, do not check for pullups. #9132. Thanks @mariopesch.

Documentation changes

Build and infrastructure changes

• Fix local and ReadTheDocs documentation builds. #9187, #9185. Thanks @dhalbert.

Translation additions and improvements

• Thanks for translations:
  • @wtuemura (Portuguese - Brazil)

New boards since 9.1.0-beta.0

• MakerGo ESP32C3 Supermini. #9131. Thanks @SeanTheITGuy.
• SQFMI Watchy. #9153. Thanks @joshua-beck-0908.
• Sunton ESP32-2424S012. #9110. Thanks @SeanTheITGuy.
• Sunton ESP32-8048S070. #9149. Thanks @SeanTheITGuy.
• Waveshare RP2040-GEEK. #9187, #9090. Thanks @RetiredWizard.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.1.0-beta.0, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.0.4

This is CircuitPython 9.0.4, the latest bugfix release 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.

For notable changes to 9.0.0 since 8.x.x, see the 9.0.0 release notes.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C3
• nrf: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.0.3

Fixes and enhancements

• External flash cache allocation crashed into safe mode when heap was too small. #9169. Thanks @dhalbert.

Port and board-specific changes

Broadcom

Espressif

i.MX

nRF

• Move state word that survives reset to avoid its being overwritten by bootloader. #9168, #9160. Thanks @tannewt.
• Fix regression from 9.0.3 treating small internal-only negative ADC values as large positive values. #9161. Thanks @dhalbert.
• Allow reuse of AnalogIn pins as other types of pins. #9161. Thanks @dhalbert.

RP2040

SAMx

SiLabs

Spresense

STM

Individual boards

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards since 9.0.3

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.0.3, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.

CircuitPython 9.0.3

This is CircuitPython 9.0.3, the latest bugfix release of CircuitPython, and is a new stable release.

The only changes to 9.0.3 from 9.0.2 are a fix for AnalogIn on Nordic nRF boards, and the addition of the Waveshare RP2040-GEEK board.

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.

For notable changes to 9.0.0 since 8.x.x, see the 9.0.0 release notes.

Download from circuitpython.org

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

Installation

To install follow the instructions in the Welcome to CircuitPython! guide. To install the latest libraries, see this page in that guide.

Try the latest version of the Mu editor for creating and editing your CircuitPython programs and for easy access to the CircuitPython serial connection (the REPL).

Documentation

Documentation is available in readthedocs.io.

Port status

CircuitPython has a number of "ports" that are the core implementations for different microcontroller families. Stability varies on a per-port basis. As of this release, these ports are consider stable (but see Known Issues below):

• atmel-samd: Microchip SAMD21, SAMx5x
• cxd56: Sony Spresense
• espressif: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C3
• nrf: Nordic nRF52840, nRF52833
• raspberrypi: Raspberry Pi RP2040
• stm: ST STM32F4 chip family

These ports are considered alpha and will have bugs and missing functionality:

• broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
• litex: fomu
• mimxrt10xx: NXP i.MX RT10xxx
• silabs: Silicon Labs MG24 family
• stm: ST non-STM32F4 chip families

Changes since 9.0.2

Fixes and enhancements

Port and board-specific changes

Broadcom

Espressif

i.MX

nRF

• Fix always zero AnalogIn.value. #9114. Thanks @dhalbert.

RP2040

SAMx

SiLabs

Spresense

STM

Individual boards

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards since 9.0.2

• Waveshare RP2040-GEEK. #9090. Thanks @RetiredWizard.

Known issues

• See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
  • 9.0.x
  • 9.1.0
  • 9.x.x
  • long term

Thanks

Thank you to all who used, tested, and contributed since 9.0.2, including the contributors above, and many others on GitHub and Discord. Join us on the Discord chat to collaborate.