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CircuitPython 0.9.1

From the release page:

Welp, I thought we were approaching a state of more bug fixes and fewer features but then I decided to improve the Python slice object and ran out of flash space on the “local” boards. So, I went looking for some bytes and managed to free up ~5000 bytes using link time optimization (LTO)! Everything has worked well for me so far but it’d be good to get some soak time on LTO.

This release is based on MicroPython 1.8.7.

Change highlights since 0.9.0:

  • Switch on link time optimization for “local” boards. “Express” boards will get it once GCC is fixed.
  • Add experimental USB HID mouse and keyboard support and a helper driver to go with it.
  • Add indices() support to slices and turn on named attributes on slices.
  • Lots of bug fixes too!

To install, download a .bin file and follow the guide here for M0 and here for ESP8266.


Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.

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