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RELATED GUIDES

Adafruit nRF52 Pro Feather with Mynewt
Take your Bluetooth LE projects to the next level with the mynewt RTOS
by lady ada
The Adafruit Feather nRF52 Pro ships pre-programmed with the Mynewt serial bootloader that allows you to flash firmware to the device directly from the command-line using the on-board USB Serial converter and the 'newtmgr' tool, so you can get started right away with no additional hardware required. For more advanced debugging, however, you can use a Segger J-Link and the on-board SWD debug connector, which gives you access to a more powerful set of development tools and options.
Programming Microcontrollers using OpenOCD on a Raspberry Pi
Native GPIO bit twiddling your way to success
by lady ada
OpenOCD is great because its cross platform, open source, and has support for a vast number of chips & programmers. You can use OpenOCD with dongle-programmers such as J-Link and ST-Link or even an FTDI chip. But, if you have a spare Raspberry Pi (and who doesn't these days?) you can use it as a native OpenOCD programmer with just a few wires.
Programming Microcontrollers using OpenOCD on a Raspberry Pi
Native GPIO bit twiddling your way to success
by lady ada
OpenOCD is great because its cross platform, open source, and has support for a vast number of chips & programmers. You can use OpenOCD with dongle-programmers such as J-Link and ST-Link or even an FTDI chip. But, if you have a spare Raspberry Pi (and who doesn't these days?) you can use it as a native OpenOCD programmer with just a few wires.
Building CircuitPython
How to build CircuitPython yourself on different platforms
by Dan Halbert
We'll show you how to set up a build environment for CircuitPython and then build it yourself. You might want to do this to keep up with the latest development version or to make a custom version for yourself.