[Anton]

I remember being really surprised to see that the algorithm I developed wouldn't wprk just because x- axis had 255 as the left value, not the right one as I expected, but soon I realised that to invert it I just had to add a line of code p1_x=255-p1_x;
What I'm trying to tell is that even if you don't know the correct axes values you don't need to worry, you can easily map them as you wish-you can even make them -127 to 128, if you think that it's worth the effort. Personally, I htink it would be nice, but I already wrote half my brogramm using the default values, so there's no point giving myself more work than needed. But if you are just beginning the joysticks, I think it's a good thing to do.