From the GitHub release page: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 9.0.0Incompatibility warningsAPI changes to floppyio.
String values in settings.toml must be quoted.
AudioRP2040 I2SOut supports BLCK and LRCLK in either order.
Built-in modulesEnhance 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.
Graphicsfourwire.FourWire: chip_select pin is now optional.
picodvi now supports 640×240 and 800×240 resolutions.
InternalEspressif: update to ESP-IDF v5.2.1.
Espressif: Change task-switching quantum to 1 millisecond from 10 milliseconds.
SupervisorString values in settings.toml must be quoted.
USBmax3421e USB host support.
Allow user-specified names for usb_midi interfaces and jacks.
Download from circuitpython.orgFirmware 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.InstallationTo 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).DocumentationDocumentation is available in readthedocs.io.Port statusCircuitPython 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.0Fixes and enhancementsUpdate 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 changesBroadcomEspressifDocument 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.MXnordicFix AnalogIn. #9187, #9161, #9114. Thanks @dhalbert.
Move state word that survives reset to avoid its being overwritten by bootloader. #9160. Thanks @tannewt.
RP2040Disable picodvi and usb_host on boards that cannot use them. #9116. Thanks @bablokb.
picodvi now supports 640×240 and 800×240 resolutions. #9102. Thanks @jepler.
SAMxFix AudioOut timer allocation. #9165. Thanks @dhalbert.
SiLabsSpresenseSTMIndividual boardsFireBeetle 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 changesBuild and infrastructure changesFix local and ReadTheDocs documentation builds. #9187, #9185. Thanks @dhalbert.
Translation additions and improvementsThanks for translations:
@wtuemura (Portuguese – Brazil)
New boards since 9.1.0-beta.0MakerGo 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 issuesSee 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
ThanksThank 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.
