How to use a generic controller for PPSSPP?

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It depends on which ppsspp version you use.
The versions on which Option=>Controls work you don't need to do anything
On version Options=>Controls don't work,you have to go to(screen menus)System=>Controls=>left to page 3(Pad) and enable "mapping active"

If it doesn't work,go to Control Panel=>Game Controllers=>Advanced=>make sure the controller is selected