From the GitHub release page:
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
supportsBLCK
andLRCLK
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 abool
.- Incompatible change:
floppyio
improvements, including API changes.
Graphics
fourwire.FourWire
:chip_select
pin is now optional.picodvi
now supports 640×240 and 800×240 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 providessocket
.
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, SAMx5xcxd56
: Sony Spresenseespressif
: Espressif ESP32, ESP32-S2, ESP32-S3, ESP32-C3nordic
: Nordic nRF52840, nRF52833raspberrypi
: Raspberry Pi RP2040stm
: 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 2Wlitex
: fomumimxrt10xx
: NXP i.MX RT10xxxrenode
: hardware simulatorsilabs
: Silicon Labs MG24 familystm
: 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 providessocket
. #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:
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.