Swift + Orange Pi + LEDs
git clone https://github.com/adagio/RGBSemaphore
cd RGBSemaphore
swift build
In
Packages/CStatfs-1.0.0/module.modulemap
Replace
x86_64-linux-gnu
by
arm-linux-gnueabihf
swift build
sudo .build/debug/RGBSemaphore
LEDs will turn on in RGB sequential way.