Using Dolphin's Native Support (Requires an actual Nintendo Switch adapter OR a 3rd adapter with a toggle on it)
If you have the official Nintendo Wii U adapter or the 4 port Mayflash adapter, then you can utilize Dolphin's native support for these adapters (Direct Connect). The Direct Connect feature has 0 input lag and is 100% accurate to a console. Always use this if you can. While using Direct Connect, Dolphin configure the controller to match console automatically. This being said, you should not use the GC Pad Settings and changing the settings there will not affect your controller while Direct Connect is on.
*Uninstall the vJoy driver if you have it installed. Only applies if you have installed vJoy in the past.
*If using the Mayflash adapter, set it to Wii U mode. Do not try to use PC Mode.
Use the Official Dolphin GameCube Adapter Installation Guide. As you might know, there are lots of different installation guide and driver versions for the same Dolphin GameCube adapter. If you follow the incorrect instruction related to your driver version, you may encounter the Dolphin GameCube adapter not detected issue. I want to use my gamecube controller to play. I already have a driver set up for it (vJoy) and it works for Rivals of Aether. On top of this, the game recognizes that I have a gamecube controller plugged in, as in my controlls settings it gives me the 'Gamecube Adapter for Wii U' option, but no matter how I try I can't get it to actually recognize any imputs. For the guide, I will be using the Official Gamecube Adapter for the Wii U. If your using a 3 Party Adapter (which has less accurate deadzones) then make sure you have the drivers properly installed to continue without a problem. If you would like to use the Official Gamecube Adapter instead of the 3 party adapter, you can find it a Gamestop. You should either use Dolphin, or reWASD. Not at the same time. When you open it in Dolphin, controller disappears it from the system, thus, it cannot be detected by our software. And never mind the message about not-original original. Sorry about that. First, if you’re using a non-official Adapter that offers a toggle between “Wii U” and “PC” modes, switch it to “Wii U.” Dolphin has native support for the GameCube Controller Adapter once you have installed the proper driver, so feel free to ignore the PC mode unless you wish to use the controller in other applications.
1. Download and open Zadig.
2. Open the options menu and click 'List All Devices'.
Using Dolphin Gc Controller Driver Windows 10
3. Select WUP-028 in the pulldown menu, and ensure the USB ID is 057E 0337. If you do not see this then try plugging the adapter (specifically the black USB cord) into a different USB port.
4.Select WinUSB on the right column then click Replace Driver and select Yes to modify the system driver.
5. Open Dolphin > Controllers. For Port 1, in the dropdown menu, select GameCube Adapter For Wii U and to verify that it works, click configure and make sure Direct Connect is selected and the adapter is detected:
(Quick Note: If you want rumble on and are using the Mayflash 4 port adapter, then you have to plug in BOTH USBs. The Official WiiU only needs one to activate rumble)
6. YOU CANNOT CONFIGURE DIRECT CONNECT LIKE OTHER ADAPTERS.
The inputs will work as intended. Just start the game emulation to test.
Using Dophin Gc Controller Driver
7. If you're adapter is NOT being detected, make sure you close all other instances of dolphin and restart 5.0-321.
Using Dolphin Gc Controller Driver Download
**For other OS's, follow these respective guides ( Mac / Linux ).