From the GitHub release page:
This release includes a number of bug fixes to
displayiosince Beta 0.
This is a beta build of 4.0.0. There are still issues to fix before stable and the new APIs may evolve a bit more. Please use the latest 3.x stable release when first starting with CircuitPython. It is stable.
4.0.0 is the latest major revision of CircuitPython and features support for the nRF52840 BLE chipset and translated messages.
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).
Most builds are available as both UF2 and bin files here along with test builds.
New Features, Updates, and Fixes since Beta 0
bleiofixes that make it work with newer iOS devices and Android. Thanks to @dhalbert
bleiodocs. Thanks to @dhalbert
- Fix time.struct_time() incorrect argument checking. Thanks to @jerryneedell
- Fix color computation in
displayio.Paletteand make init code more USB friendly. Thanks to @tannewt
- Translation updates:
- German thanks to @Tasm-Devil
Breaking Changes from 3.x!
- busio.UART breaking changes to match PySerial. Thanks to @dhalbert
- busio.UART constructor timeout parameter is now in seconds instead of milliseconds
- UART.readinto(buf) now does not allow an optional length parameter UART.readinto(buf, len)
- UART.write(…) no longer allows strings to be written. The bytes written must be bytes or bytearray or an array.array.
framebufhas been removed.
displayiois its replacement, and will be enhanced after 4.0 to include
structcompatibility with CPython by enforcing stricter types. This may break your code! Thanks to @dhalbert
Thank you to all who used, tested, contributed, helped out, and participated on GitHub and/or Discord:
@ladyada, @dhalbert, @tannewt, @kattni, @microbuilder, @hathach, @arturo182, @nickzoic, @glennrub, @siddacious, @deshipu, @sommersoft, @jerryneedell, @brentru, @caternuson, @jepler, @urish, @sajattack, @notro, @Jahor, @Makdaam, @mrmcwethy, @jepler, @notro, @mattyt, @furlaneto, @ATMakersBill, @Klowner, @klardotsh, @C47D, @carlosperate, @platipo, @xpecex, @gcvasconcelos, @saspa, @uhrheber, @nickzoic, @sabas1080, @sajattack, @JoshuaLowe1002, @Senuros, @mchobby, @Retoc, @CedarGroveStudios, @bwshockley, @yeyeto2788, @jimblom, @rhooper, @ShawnHymel, @TG-Techie, @eighthree, @arofarn, @chalei, @vgoodwinv, @gpshead, @dsiee, @Tasm-Devil, @larsks, @CarlFK and surely more we have missed. Join us on the Discord chat to collaborate.
Documentation is available in readthedocs.io.