I got started at the base and analyzed the HAL (Hardware Abstraction Layer) of the project. I was studying some things, basically the functions and how to use the framework. I noticed that the functions are pretty standardized, like how to use registers, handle addressing, and use macros, directives/variables.

Basically, the headers I was going to use and docs and things like that I was checking out, now speaking exclusively about the Aliexpress display that was in Mandarin (some of the ones I saw while researching) and offline I was tinkering and looking at some things, asking AI to explain and check things to move forward. I got the variant I was going to use, and later on it got analyzed and the board_pins.h ended up fine.
I also started messing with the keypad, just defining it and later on how to monitor and use the identifiers of each key .