controller compatibility issues

[ludokikou]

Hi there, it's been a while i'm looking for an answer to my problem on internet.
i found nothing so i hope you'll be able to guide me.

First, i play on ANDROID. i use different emulators like ePSXe, drastic, etc.
all of them works just fine with my ps4 controller, which is a real pleasure to play with because i don't want to buy another controller for that.

My problem is that, even though the controller is recognized by ppsspp, it's very (let's say impossible) to play with.
i've been fighting with the controller configuration in the settings and stuff but i'm surrendering...
When i press square, circle is recognized, etc etc.
when i finally find a way to put square as square, circle as circle, it's the joystick and direction cross that doesn't answer anymore !
i really don't understand what is wrong.
i really hope you guys can help me, that would be really nice of you.
Thank you.