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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@LaplaceG
The Energy Profiler is included in Simplicity Studio, and yes, it uses the hardware that's on all the Gecko starter kits. While originally only for Gecko devices, you can use it to profile any other device you want.
No, the USB->Serial is just a plain UART. I think the long term solution is to move it to the in-device USB, not sure if it makes too much sense to spend time on implementing something in-between.