Port Epsilon to the Nintendo 3DS

[M4xi1m3]

This is a fully functional port of Epsilon to the Nintendo 3DS. It has display, keyboard and button support. It runs well on citra and on real hardware.

Building:
You need devkitPro and devkitARM installed and in your path (instructions here)

make PLATFORM=simulator TARGET=3ds -j
3dsxtool output/release/simulator/3ds/epsilon.elf epsilon.3dsx

You can then put epsilon.3dsx on a SD card to run it from the HBC or use 3dslink to launch it over the network:

3dslink epsilon.3dsx -a <3DS' IP ADDRESS>

Todo list:

• Get it to boot
• Get it to display stuff
• Virtual keyboard
  • Put the non-debug keyboard image
  • Add a throttler for the virtual keyboard
• Button support
  • Add a throttler for the buttons
• Add language detection
• Add a way to quit properly (without force-shutting down the system)
• LED Driver
• Peudo-USB Driver (detect plugging-in to go out of exam mode)
• Battery driver
• Edit build system to make it output a .3dsx
  • Make it integrate smdh data
• Edit the build system to make it output a .cia
  • Make the .cia able to overwrite the home menu
• Go to an exam with that thing

Disclaimer:
This is obviously a joke, but at the same time a fun PoC.

Screenshots:
Mandelbrot example + function drawing on citra:

Picture of it running on actual hardware:

[NumWorksBot]

	.text	.rodata	.bss	.data
Base	641 76 bytes	231 699 bytes	174 952 bytes	208 bytes
Head	641 76 bytes	231 699 bytes	174 952 bytes	208 bytes
	+ 0 bytes	+ 0 bytes	+ 0 bytes	+ 0 bytes
	+ 0 %	+ 0 %	+ 0 %	+ 0 %

[NumWorksBot]

	.text	.rodata	.bss	.data
Base	641 76 bytes	231 699 bytes	174 952 bytes	208 bytes
Head	641 76 bytes	231 699 bytes	174 952 bytes	208 bytes
	+ 0 bytes	+ 0 bytes	+ 0 bytes	+ 0 bytes
	+ 0 %	+ 0 %	+ 0 %	+ 0 %

[Ecco]

LOL 🤣

By the way, I'm surprised that you would need a debouncer. Did you actually experience any bounce in practice on real hardware?

That being said, and no matter how fun this is, I'll have to close this PR. We don't have any plan of merging nor maintaining this port (for reasons I assume will be obvious to everyone). And we'd rather keep only active PRs open.

Thanks though, that's a lot of fun 😄

[M4xi1m3]

Thank you for your kind answer. I'm planning to continue working on this, for the meme, even tho it won't be merged. I actually experienced bounciness on real hardware, both with the buttons and the touchscreen. I don't know if it's because my 3DS is getting old or anything, but I prefer to put a debouncer just in case. I might put a build of this on the TinyDB 3DS homebrew repository once it's mature enough. I also found a weird bug involving pressing shift / alpha. It only stays activated for like one second, even if I don't do anything.