Ok I fixed the issue with the compilation.

So I made a firmware that uses most of the fixes of other firmware (Shift+buttons, joystick name change), disables the debug and serial mode (that were causing issues), and also completely disable the Z, Rx, Ry and Rudder axis for maximum compatibility ...

I've finally managed to make the changes I wanted to the firmware and compile it, but I have a weird issue.
It seems WinAVR makes the firmware .hex file way bigger than needed.

When compiling, I get that result;

Size after:
AVR Memory Usage
----------------
Device: atmega32u4

Program: 19678 ...

Hi,
Here should be the last one:
https://github.com/tloimu/adapt-ffb-joy
https://github.com/zduford/adapt-ffb-joy


Thanks, but actually this one seems more recent;
https://github.com/r8dhex/adapt-ffb-joy/tree/feature/shiftEnable
I just wanted to be sure it was the last stable one with bug fixes ...

Hey guys,

Sorry to revive this old thread, but I have a small issue with the firmware of this diy adapter.

It works fantastic with most game with my FFP stick, everything is nice.

But some games like Freespace 2 sadly support only a limited number of axis (6 I think?), meaning the throttle axis ...