CircuitPython 6.1.0 Release Candidate 0 Released!
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Please be positive and constructive with your questions and comments.

CircuitPython 6.1.0 Release Candidate 0 Released!

by danhalbert on Tue Jan 05, 2021 11:48 pm

This is the first release candidate of CircuitPython 6.1.0. See Port status below for details on port stability, and Known Issues for known problems. If you find any issues with this release, please file an issue. If no issues are found within a few days, we'll release this version as stable.

Download from circuitpython.org
Downloads are available from circuitpython.org. The site makes it easy to select the correct file and language for your board. The downloads page is here. Downloads are no longer available from the GitHub release pages because of the large number of files for each release.

To install follow the instructions in our new 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).

Port status
CircuitPython has a number of "ports" that are the core implementation for a variety of microcontroller families. Stability varies on a per-port basis. As of this release, atmel-samd, nrf, and stm for the F4 family are stable. cxd56, esp32s2, and stm for other chip families are being actively improved but may be missing functionality and have bugs. litex and mimxrt10xx are in an alpha state and will have bugs and missing functionality.

New features and improvements since 6.1.0 Beta 3
Fixes and enhancements
  • Fix initialization of onboard NeoPixels. #3934. Thanks @DavePutz.
  • Update ulab to 1.6.0. #3929. Thanks @jepler.
  • Fix handling of zero brightness in _pixelbuf. #3917. Thanks @brrzap.
Board- and port-specific changes
  • CPX: Add back frozen adafruit_bus_device back to CPX. #3932. Thanks @kattni.
  • UnexpectedMaker FeatherS2: Correct pins and add default board devices. #3925, #3914. Thanks @UnexpectedMaker , @askpatrickw.
  • ESP32S2: Add alarm.touch.TouchAlarm. #3850. Thanks @microDev1.
  • Mini SAM 4: Freeze in adafruit_dotstar library. #3923. Thanks @bwshockley.
  • Translation additions and improvements. Thanks:
    • @wtuemura (Brazilian Portugese)
    • @HugoDahl (French)
    • @oonid (Indonesian)
    • @bergdahl (Swedish)
Full commit log is here.

Breaking changes since 5.x
  • i2cslave is now i2cperipheral and the class in it is changed as well.
  • The stop kwarg has been removed from I2C.writeto(). If no stop is desired, then use writeto_then_readfrom.
  • The default speed of busio.I2C and board.I2C is now 100khz, not 400khz as before. Use busio.I2C to set the speed explicitly. #3471 Thanks @caternuson, @ladyada, @hierophect and @tannewt
  • _bleio.ConnectionError has be removed. Code will now raise the native ConnectionError instead.
New boards since 6.1.0 Beta 3

Known issues
  • ESP32-S2: Crash when repeatedly creating and destroying busio.I2C object on ESP32-S2 (#3846)
  • time.sleep() sometimes hangs when a board is connected to certain Macintosh hosts (#3918, #3919). This issue is also present in 6.0.x.
  • Built-in adafruit_bus_device has been disabled due to issues (#3859, #3856), please install the version from the Library Bundle
  • See https://github.com/adafruit/circuitpython/issues for other issues.
Thank you to all who used, tested, and contributed since 6.1.0 Beta 3, including @askpatrickw, @bergdahl, @brrzap, @bwshockley, @DavePutz, @dglaude, @dhalbert, @hugodahl, @jepler, @kattni, @ladyada, @microDev1, @oonid, @tannewt, @UnexpectedMaker, @wtuemurua, and many others on Discord. Join us on the Discord chat to collaborate.

Documentation is available in readthedocs.io.

This release is based on MicroPython 1.9.4 @25ae98f. Support upstream MicroPython by purchasing a PyBoard (from Adafruit here) or sponsoring MicroPython on GitHub.

One important feature of CircuitPython is translated control and error messages. With the help of fellow open source project Weblate, we're making it even easier to add or improve translations. Sign in with an existing account such as Github, Google or Facebook and start contributing through a simple web interface. No forks or pull requests needed!

Check out this guide for info on common problems with CircuitPython. If you are still having issues, then post to the Adafruit Support Forums and join Discord.

Builds are no longer stored as assets on this release page, because there are too many of them. Please see the Download from circuitpython.org section above.

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Joined: Tue Aug 08, 2017 12:37 pm

Re: CircuitPython 6.1.0 Release Candidate 0 Released!

by pede on Fri Jan 08, 2021 7:12 am

Hi Dan

great work, I want to use a FeatherS2 - ESP32-S2 Feather Development Board. I've red it has a bootloader, so after connecting it to the mac one can simply copy the latest circuitpython version (for example: adafruit-circuitpython-unexpectedmaker_feathers2-en_US-20210107-55c8075.uf2) to the board, or I'm wrong? I red a lot of stuff in in discord, adafruit but I'm still a little bit confused about the right way :-(
For my lora project (s2 and Adafruit RFM95W LoRa Radio Transceiver Breakout - 868 or 915 MHz - RadioFruit) , to improve lipo runtime I need pin.alarm, which is a really great feature.
My thx in advance


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Joined: Sun Jul 12, 2020 2:16 pm

Re: CircuitPython 6.1.0 Release Candidate 0 Released!

by tannewt on Fri Jan 08, 2021 2:17 pm

Hi Peter, see https://feathers2.io/ (specifically the FAQ) for instructions to enter the bootloader. You may need to install it if you got an early version of the board.

Posts: 2034
Joined: Thu Oct 06, 2016 8:48 pm

Re: CircuitPython 6.1.0 Release Candidate 0 Released!

by pede on Fri Jan 08, 2021 2:26 pm


many thx have a nice evening. I think you mean this:

How can I get my FeatherS2 into UF2 bootloader mode?
If your FeatherS2 shipped with the UF2 bootloader, you can click [RESET], then click [BOOT] to get it into the UF2 bootloader mode. You will then see the RGB LED on your FeatherS2 turn Red while the device is unmounted, and then once mounted, it will turn green.
A drive will appear in your filesystem called UFTHRS2BOOT. From here you can re-flash the latest CircuitPython firmware by copying over the firmware.uf2 file for the version you want to install..
Cool stuff ...
Many thx


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Joined: Sun Jul 12, 2020 2:16 pm

Please be positive and constructive with your questions and comments.