How to get from XADC to PWM?

Hi,

First, I should say that I am just an FPGA starter. I have an Arty board and I have installed vivado and I am running VHDL codes that generate PWM signals.
However, the main goal is to read analogue voltage through the XADC ports and produce PWM based on the analogue input.

I have produced a bipolar +/-0.5V voltage by the signal generator, but I do not know how to read it by XADC and then produce PWMs with it.

Any help is immensely appreciated.