Digital current control implementation

Hi. Recently I have designed a digital buck converter using PIC16F1769 with the help of application note TB3103 (Title: Buck converter using the PIC16F753 analog features) from Microchip. It's working fine. Now I have to add current control (not peak current control that is already working as described in application note) so that I can limit output current to the desired value and may be variable current control so that it works as a test bench power supply. My question is how to implement it. I'm using MCC tool in MPLABX to configure the hardware. I don't want to use external circuitry to control the current instead I want to have control over PWM on time so that current control can be implemented along with voltage control within IC.