3DS:Rehid

Rehid
Developer(s)	hax0kartik
Console	Nintendo 3DS
Version	4.0 (July 20, 2023; 3 years ago)
Links
Website	gbatemp.net/threads/585387
GitHub	hax0kartik/rehid
Download
	Universal-DB; GitHub release;
	v; t; e;

Rehid is a rewrite of the 3DS' hid module, that allow for the remapping of buttons or the touch screen in 3DS titles.

Features

Remapping Buttons - Rehid allows for the remapping of buttons or button combos to different buttons or combos.
Remapping Directional Input - Rehid also lets you remap the circle pad or the C stick, and can map the circle pad or D-pad to each other.
Remapping Touch - You can assign button inputs to points on the touchscreen, or map certain areas on the touchscreen to button.
Per Game Remaps - Rehid allows you to save configurations to a specific title, or set a remap to be used globally.
RehidHelper - Rehid features an app to help you download Rehid's sysmodules, scan QR codes to install configurations, or disable Rehid.

Installation

what you need

A working internet connection
Universal Updater installed on your console
Luma3DS updated to 13.0+

instructions

Power on the console
Launch Universal-Updater
Tap the magnifying glass on the bottom screen, then search for rehid
Press A while hovering over rehid from the list of homebrew
Choose rehidhelper.cia
Wait until the app installs
Close Universal-Updater
Launch RehidHelper and select Download Rehid
Wait for it to download and reboot, then press B to exit the app
Power off your Console
While holding SELECT, power on your console to enter Luma3DS configuration
Ensure that "Enable loading external FIRMs and modules" is selected
Press START to save and exit

what you need

the latest release of Rehid (the 0004013000001D02.cxi and rehidhelper.cia files)
FBI installed on your console
Luma3DS updated to 13.0+

Instructions

Copy 0004013000001D02.cxi to sd:/luma/sysmodules/
- Create the folder sysmodules if it doesn't exist
Copy rehidhelper.cia to the root of your SD card
Reinsert your SD card into your console
Launch FBI and select SD -> rehidhelper.cia -> Install and delete CIA
Press A and wait for the CIA to install, then exit FBI
Power off your Console
While holding SELECT, power on your console to enter Luma3DS configuration
Ensure that "Enable loading external FIRMs and modules" is selected
Press START to save and exit

Usage

Adding configs

Go to 3DS Remap Builder to configure your key mappings
When finished click on Show as QR code
- If you are unable to scan QR codes on your console, instead click Build this remap and place the downloaded rehid.json into a rehid folder on the root of your SD card, or rehid/(title ID)/ to remap a specific game. You can find the title ID of your game using 3dsdb
Power on your console and launch RehidHelper
Select Scan QR Code and scan the generated QR code from the website
Press A to proceed
Select a title from the list for the remap to be applied to, or select global for all titles
Press start to exit

Disabling Rehid

launch RehidHelper from the HOME menu
Select Toggle Rehid State
Press B to reboot.

Removing configs

For global configurations delete /rehid/rehid.json or, for a configuration set to a title delete /rehid/(Title ID)/rehid.json

Configuration

Config file

Rehid stores its key mappings in .json files located at /rehid/rehid.json, or in a title ID folder within /rehid/ to use with a specific title. You can manually create your own key mappings by creating a rehid.json file with the key mappings you want. Possible options include:

"keys": which maps a key press to another key press.

{"keys":[{"press":"ZR","get":"R"},{"press":"ZL","get":"L"}]}

With the above, any time you press the ZR key, R key would be triggered, and any time you press the ZL key, L key would be triggered. Possible Keys are: A, B, X, Y, SELECT, START, ZL, ZR, L, R, LEFT, RIGHT, UP, DOWN, CLEFT(CPAD), CRIGHT(CPAD), CUP(CPAD), CDOWN(C-PAD), CSLEFT(C-STICK), CSRIGHT(C-STICK), CSUP(C-STICK), CSDOWN(C-STICK)

You can also do custom key combos;

{"keys":[{"press":"X+Y","get":"R"},{"press":"SELECT","get":"L+R"}]}

With this any time you press X+Y, R key would be triggered, and any time you press the SELECT button, both L and R would be triggered.

"cpad":, which maps a key press to a circle pad x and y coordinate from -190 to 190;

{"cpad":[{"press":"CUP","get":[0,190]},{"press":"CDOWN","get":[0,-190]},{"press":"CLEFT","get":[-190,0]},{"press":"CRIGHT","get":[190,0]}]}

"touch":, which maps a key press to a given x,y coordinate on the touchscreen from 0,0 top left to 320,240 bottom right;

{"touch":[{"press":"LEFT+UP","get":[0,0]},{"press":"RIGHT+DOWN","get":[320,240]}]}

"touchtokeys": which maps a box starting at a given x,y coordinate, with a given height and width, that when tapped will output a key press;

{"touchtokeys":[{"press":[10,20,50,100],"get":"A"}]}

For this example, it creates a box starting at x=10 y=20, with a height of 50 and a width of 100.

Other options include:
"cpadtodpad":true maps the C-pad with D-pad key presses
"dpadtocpad":true maps the D-pad with C-pad key presses
"overidecpadpro":true makes it so games don't recognize the circle pad pro
"homebutton": maps the HOME button to a key press

These Options can be strung together into a single line, for example:

{"keys":[{"press":"ZR","get":"R"},{"press":"ZL","get":"L"}],"cpad":[{"press":"CUP","get":[0,190]},{"press":"CDOWN","get":[0,-190]}],"touch":[{"press":"LEFT+UP","get":[0,0]},{"press":"RIGHT+DOWN","get":[320,240]}],"touchtokeys":[{"press":[10,20,50,100],"get":"A"}],"cpadtodpad":true,"dpadtocpad":true,"overridecpadpro":true,"homebutton":"ZR+ZL"}

SD file layout

(root)
- rehid
  - rehid.json
  - (title ID)
    - rehid.json

Troubleshooting

An exception occurred

If your console crashes while booting with "an exception occurred" and the "current proccess:" is hid, you may have an old version of Rehid thats causing issues. Look for and delete /luma/titles/0004013000001D02 and /luma/titles/0004013000003302. If these don't exist, you may have a more serious hardware issue, join the Nintendo Homebrew Discord and ask, in English, for help.