1. Then press controllers on dolphin, on the port 1 click the dropdown menu and pick gamecube adapter for wii u. All should be good to go but if you want to check you can click configure next to the dropdown menu and it should say adapter detected. Edit: just saw your other comment. Uh make sure when you install the driver using zadig you change.
  2. To use the Gamecube controller on PC using x360ce, follow the steps given below: Step 1. Install vJoy Device Driver. First, you have to download the latest version of the Wii U GCN USB Driver for your system. To download the driver, you can visit Massive’s GameCube Controller Adapter Blog.

Using Dolphin's Native Support (Requires an actual Nintendo Switch adapter OR a 3rd adapter with a toggle on it)

Tutorial – how to use GameCube controller on pc. Close the Dolphin emulator (if open). Plug the GameCube adapter into the USB ports of your computer. If you want to enable vibration and wireless controls, you must insert the two USB connectors included in the adapter.

Compatible Adapters (This includes any adapter that is compatible with the Wii-U):
Controller
Mayflash 4 Port Wii U + Pc Adapter with a switch to toggle modes

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.

Using Dophin Gc Controller DriverUsing Dophin Gc Controller Driver

*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.

1. Download and open Zadig.

Using dolphin gc controller driver download

2. Open the options menu and click 'List All Devices'.

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:

Using Dolphin Gc Controller Drivers

Using

Using Dolphin Gc Controller Driver Windows 10

(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.

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 ).