You can simply test functionlaity of your gamepad/controller/joystick with X Gamepad Tester and check all the buttons and axis input.
X Gamepad Tester allows you to troobleshoot your connected gamepad.
Features:
• Shows keys you have pressed
• Shows axes the analog controls move
• Shows sticks input and pressure
• Simple to use
• Shows raw data of input
• Fast response
X Gamepad Tester is compatible with all MFI (Made for iPhone / iPod / iPad / iOS) controllers & gamepads, also manufactured by Microsoft XBox, Logitech, Sony PlayStation DualShock ® 4 & 5.
*Please make sure the device is connected via Bluetooth before testing.