Default Stick Postion Value of GC Controller

[master0fdisaster1]

Hi,

I made a branch/fork of Dolphin with an Option to invert individual axes on the GC controller when using the Wii U GC adapter. (changes here).
And i need to know what the position of the center of the sticks is.

The X and Y axis of both the Analog Stick and the C Stick have values ranging from 0 to 255 (according to the comments left in GCPadStatus.h).
So I assumed that the center position for both sticks would be (127,127).

Here's the line where the magic happens:

Code:

pad.stickY = 127 + ((127 - controller_payload_copy[1 + (9 * chan) + 4]) * (2 * SConfig::GetInstance().invertedY[chan] - 1));

If the boolean "SConfig::GetInstance().invertedY[chan]"  is false, the expression is funtionally just "pad.stickY = controller_payload_copy[1 + (9 * chan) + 4]", with controller_payload_copy[1 + (9 * chan) + 4] being the input read from the GC Pad. So it's just the Input.

But if the setting is enabled the expression becomes "pad.stickY = 127 + (127 - controller_payload_copy[1 + (9 * chan) + 4]) "
So it takes the difference between the input and the assumed center value and subtracts it from the assumed center value. So if you input 8 units above the Center you'll end up 8 units below the Center.

But when I compiled and tested it the C-Stick seemed to be Off-Center whenever I had the Option enabled. So Position(127,127) can't be the center of the C-Stick.

Using this homebrew app and TAS input I determined the center of the C-Stick to be Position(120,125) and using those values in my second commit fixed the problems I had while testing the earlier build. But I don't know for certain if those values are actually acurate or just really close.

So does anyone know the center value?

[JosJuice]

The center value is slightly different from controller to controller. The positions that the sticks are in while you boot a game will be used as the neutral positions for that run of the game (unless you use the button combination that resets the neutral positions).