Hello @jaume
you use old version recalbox. Please update your version, and your problem must be solved.
You need to define modem of ps3 controller.
Check this tutorial : https://github.com/recalbox/recalbox-os/wiki/PS3-controllers-drivers-(EN)
Edit recalbox.conf with winscp + notepad++ or via share network.
Try bluetooth, official or shanwan driver :
controllers.ps3.driver=shanwan
controllers.bluetooth.ertm=1