The Nintendo DS is a wonderful console that I grew up with. But now that I'm old and mature enough to understand how those lil machines works, I started digging into documentations and things alike.
Homebrews are wonderful. A lot of things are wonderful about the Nintendo DS but what I mostly like is probably its unique way to use wireless. pictochat is a good example of mesh_networking and I want to dig further into its capabilities.
The best resource for Nintendo DS hardware documentation is GBATEK, written by the no$gba devs: https://problemkaputt.de/gbatek-nds-reference.htm