Beginner to learn the linuxcnc source code

Hi,
I want to know if linuxcnc can be developed for electrical discharged machining ? If yes, where to start, should I understand the whole source code? And I have looked the source code, each module has many source files and the relationship is too complicated. I don' know how to start, I really need some suggestions.
Thank you for someone tell me how to get started with linuxcnc source code !

I'd start reading the Linuxcnc docs, particularly the parts relating to HAL.

Now there is a whole set of EDM machine, which adopts the structure of upper and lower computer, consists of Panasonic EtherCAT
servo driver, stm32 chips, EtherCAT slave IO, etc. I want to replace this system with linuxcnc.

And as we know, it is a characteristic of EDM that the electrode needs to move along a feeding trajectory in a positive or a negative
direction depending on the gap status. So if I need to change the interpolation algorithm of linuxcnc to adapt to EDM characteristic?

For example, to store the interpolation points data so that the electrode can go back along the original trajectory.

 
Here's a kit that will help you work in EDM with Linuxnc.
It is for sinker-edm or EDG or HoleDRill EDM.
The edm path is a single vector.
The cut uses the 'external offsets' feature of LCNC.
The kit has a fake 'gap signal' generator so you dont need hardware to test.
This is very much just a beginning'.
Have Fun
TomP

edit 24oct2021 I seebrowsers do not render my plain SVG correctly.
Inkscape works
and here's .png as well