Can you tell me what you are trying to drive? A coil? Two coils?
When for example I am driving a 90 series pump EDC bi-directional, I configure two pins with the same PinConfig value. As the EDC has two coils, I connect one side of the first coil to C1p37 and the other to ground. And the other coil, I connect the one side to C1p38 and the other to ground. As far as I know, to have reverse polarity you need to use two pins configured the same way.