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Cart #test_scancodes-1 | 2025-08-28 | Code ▽ | Embed ▽ | License: CC4-BY-NC-SA
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Note: this cart was mostly based on New Raw Key Reader, from dw817.

This is a very simple tool to show scancodes (and SDL key names) for keys pressed on a keyboard.

This can be useful when remapping handheld buttons. For example, I have an original RG35XX and I'm using the MyMinUI custom firmare. I wasn't satisfied with the default button mappings, so I decided to remap everything from scratch.

First, I commented the map_scancodes line in config.txt and ran this cart.

  • The A button was mapped to scancode 44 (spacebar).
  • The B button was mapped to scancode 224 (left ctrl).
  • I wanted to remap them to scancodes 29 (the Z key) and 27 (the X key), respectively.

If these were the only two buttons I wanted to remap, I could simply add the line below to my config.txt:

 
map_scancodes 44=29,224=27

MyMinUI actually already remaps the A and B buttons the way I wanted. In the real scenario, I did this to remap other buttons (SELECT and POWER).

But explaining Z and X keys is easier to digest, as these bindings are engraved in our brains after playing so much PICO-8 on our keyboards.

Anyway, I hope this cart is useful to someone...

SDL names

SDL names were taken from

https://fossies.org/linux/SDL2/include/SDL_scancode.h

Changelog

  • v1.1: improves the draw function to display up to 14 keys pressed at once
  • v1.0: initial version
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