SparkFun SAMD21 Dev Breakout
Vendor: SparkFun
Features: Battery Charging, DAC, USB
Source on GitHub: samd/SPARKFUN_SAMD21_DEV_BREAKOUT
More info: Website
Installation instructions
For deploying the MicroPython firmware to the SAMD module, follow the procedure:
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Push the reset button twice or call machine.bootloader(). A drive icon should appear representing a virtual drive.
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Copy the .uf2 file with the required firmware to that drive.
As soon as the drive disappears, the firmware is loaded and started.