Sorry for late answer I missed the notifications
I never got the board in hand, I did the porting by just reading original code and sending modified code to @royco who validate it, @royco supposed to send me a board but unfortunatly I never got it. So the code is the one I posted on github https://github.com/panucatt
I got request to move to RRF 3.0 but doing blind coding is not really fun 
- I posted the code to let anyone who has the board to improve it