Hi, guys, I have mapped all the pins of Nano Pi GPIO header to work with SysFS. You can check out that at http://bit.ly/2qiOTHj . That might help you. Also I ma working on a library for NanoPi S2 to access GPIO using JAVA. Will come back with that later on. If anyone interested in contributing to the JAVA lib development please respond below.

Thanks
Bikash