Overview

This is a version of my "rp2040-doom" (which itself now supports RP2350) modified to run on the DEFCON 32 Badge

Note that the badge speaker seems to distort really easily, so I have the sound turned way down for now, this is probably good anyway so you don't annoy people around you, but the volume control in the menus does work.

If you want to read about getting the fully functional and complete Demo version of Doom running in 264K and 2MB of flash, you can do so in the blog post here.

The regular build instructions should work with the latest pico-sdk and other dependencies, but you should pass -DPICO_BOARD=defcon32_badge to CMake as well.

Things that I have tried and are kwown to work:

• Demos
• Playing a game
• Completing levels
• Save/Load game (note these are stored in flash, so will persist across badge power cycles)
• Muliplayer via I2C (at least with 2 players, should work with up to 4) - see README for wiring

Things that don't work:

• "Quit Game" main menu item which is actually meant to quit to DOS (i removed the DOS mode because it uses 640x480 screen)
  • Note the menu to end an active game is actually under "Options/End Game", and does work
• There is no way to enter cheats

Things that might work:

• The end sequence (easier to test when I have added cheats)

Controller Input:

Normal button behavior

Button|Behavior --|--- Start | Show Menu / Go back Select | Select Menu Left / Right / Up / Down | Move A | Open Door B | Fire

Button behavior when pressing the FN (bottom right on the back) during game

Button|Behavior --|--- FN+Start | Show / Hide Map FN+Select | Press Select in rapid succession with FN down to press 1 then 2 then 3 etc. to select weapons FN+Left / Right / Up / Down / A / B | Strafe

Note when FN is pressed, An FPS indicator is also shown

Button behavior in menus

Button|Behavior --|--- A | Menu Back or 'N' (No) B | Menu Fowrard/Select or 'Y' (Yes)

Button behavior when typing

Button|Behavior --|--- Up/Down | Cycle through letters/space Left | Backspace Right | Select letter

Using picotool

Picotool is a very handy complement to RP2040 and RP2350 devices for interacting with devices in BOOTSEL mode (i.e. after holding BOOT while powering on)

You can find the source and build instructions here

You can backup your whole badge flash by doing

picotool save -a all_flash.bin
picotool verify all_flash.bin

you can then load it back later via:

picotool load all_flash.bin

Or

picotool load --family absolute all_flash.bin

If picotool complains based on what is in your flash already

Files

doom1_v1.uf2 - this is a UF2 which includes both the code and the WAD in one

You can load it with picotool or by drag/drop

picotool load -vx doom1_v1.uf2

Note you can use picotool info to see what is on your device

$ picotool info 
Program Information
 name:          doom_tiny
 features:      WHX at 0x10040000
                I2C multi-player
                UART stdin / stdout
 binary start:  0x10000000
 binary end:    0x1003d92c
 target chip:   RP2350
 image type:    ARM Secure