CircuitPython 10.0.0-alpha.4

@gamblor21

This is CircuitPython 10.0.0-alpha.4, an alpha release for 10.0.0. Further features, changes, and bug fixes will be added before the final release of 10.0.0.

This release is nearly the same as 10.0.0-alpha.3 but has a bug fix that breaks finalisers and results in "in use" errors. (Finalisers will usually release the resources.) It also fixes crashes on ESP32-CX RISC-V boards.

Highlights of this release

A number of new audio effects.
Improved garbage collection times
ESP-IDF update to 5.4.1
Improved audio playback on RP2

Incompatibility warnings

synthio.BlockBiquad has been renamed to synthio.Biquad. The old deprecatedsynthio.Biquad has been removed, as well as synthio.Synthesizer.low_pass_filter, synthio.Synthesizer.high_pass_filter, and synthio.Synthesizer.band_pass_filter. Coefficients from biquad_filter_state have been moved into synthio_biquad (biquad_filter_state is still used for input and output state).
The displayio bindings deprecated in 9.x.x have been removed:
- busdisplay.BusDisplay replaces displayio.Display.
- fourwire.FourWire replaces displayio.Fourwire.
- epaperdisplay.EPaperDisplay replaces displayio.EPaperDisplay.
- i2cdisplaybus.I2CDisplayBus replaces displayio.I2CDisplay.
os.uname().sysname and os.uname().nodename now are set to MICROPY_HW_MCU_NAME uniformly across all ports.
watchdog.WatchDogTimer.deinit() is removed.
_asyncio removed push_head, push_sorted, pop_head. Ensure you are using the latest version of the asyncio Python-level 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-S2, ESP32-S3, ESP32-C2, ESP32-C3, ESP32-C6
nordic: Nordic nRF52840, nRF52833
raspberrypi: Raspberry Pi RP2040, RP2350
stm: ST STM32F4 chip family

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

analog: Analog Devices MAX32690
broadcom: Raspberry Pi boards such as RPi 4, RPi Zero 2W
espressif: ESP32-P4, ESP32-H2
litex: fomu
mimxrt10xx: NXP i.MX RT10xxx
renode: hardware simulator
silabs: Silicon Labs MG24 family
stm: ST non-STM32F4 chip families
zephyr: multiplatform RTOS: testing with nRF5340, nRF54L15, RA6M5, STM32H7

Changes

Fixes and enhancements

Chorus audio effect by @gamblor21 in #10044
Audio Effect Reverb by @gamblor21 in #10196
Audio Effect Multi-Tap Delay by @relic-se in #10258
Audio Effect Phaser by @relic-se in #10304
Add selective collect to memory allocations by @tannewt in #10264
Increase CFG_TUH_ENUMERATION_BUFSIZE so that USB devices with long descriptors are recognized by @rianadon in #10281
Wifi power management by @dhalbert in #10271
increase default PYSTACK size from 1536 to 2048 by @dhalbert in #10236
Change mix calculation on audiodelays.Echo to allow full range. by @relic-se in #9994
Add working_directory for subsequent code file by @tannewt in #10263
Run background tasks during display refresh by @tannewt in #10277
Fix for fixed point overflow in synthio by @gamblor21 in #10288
Implement use_global_block_protection_lock for write-enabling flash. by @eightycc in #10249
fix swapped argument required vars in bitmaptools args helper by @FoamyGuy in #10253
update frozen libraries, especially asyncio by @dhalbert in #10251
extmod/modasyncio.c: remove push_head, push_sorted, pop_head by @dhalbert in #10244

Port and board-specific changes

Analog Devices

Broadcom

Espressif

Upgrade ESP-IDF v5.3.2 to v5.4.1 by @eightycc in #10267
ESP: add MAC address to boot_out.txt (for wifi boards) by @Neradoc in #10239

i.MX

Nordic

renode

RP2

Add touchio pullup rp2350 by @todbot in #10227
Implement BOOTSEL button entry to safe mode for RP2. by @eightycc in #10231
rp2pio mov_status_type and mov_status_n by @burtyb in #10262
Fix RP2xxx I2SOut reversed channels by @dhalbert in #10250
Tweak audio playback on RP2 by @tannewt in #10299

SAMx

SiLabs

Spresense

STM

Zephyr

Individual boards

Add Blues Cygnet Feather (STM32L433) board by @Bucknalla in #10211
Added peripheral support for Daisy Seed stm32H750 board by @snkYmkrct in #10198
boards/oxocard_*/board.c: Fix vertical offset for LCD screen by @supcik in #10302
Seeed Xiao ESP32-C6: Add user LED to pins.c by @KanyonKris in #10273

Documentation changes

Build and infrastructure changes

Translation additions and improvements

New boards

Feather RP2350 adalogger by @BlitzCityDIY in #10254

Known issues

See https://github.com/adafruit/circuitpython/issues for other issues, including issues still to be addressed for:
- 9.2.x
- 9.x.x
- 10.0.0
- 10.0.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.

New Contributors

@Bucknalla made their first contribution in #10211
@KanyonKris made their first contribution in #10273
@rianadon made their first contribution in #10281

Full Changelog: 10.0.0-alpha.3...10.0.0-alpha.4

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