DC29 Badge Stuff

What's in the repo

• Funny music code
• Firmware used (in case of updates)

Dumping/flashing the firmware

• To access firmware: hold down bottom right button when plugging into USB - a drive with a UF2 file should appear
• Use uf2conv (also needs this json file in the same folder)
• python3 uf2conv.py DC29Human3.UF2 -> dump firmware
• python3 uf2conv.py flash.bin -o NEW.UF2 -> create new firmware
• To reflash firmware: drag your new UF2 file back into the drive and it should automatically reboot

Compiling

• clang -O2 -nostdlib -mthumb --target=armv6-none-eabi music.c -> compile to elf
  • If you are on MacOS: use homebrew to install a full clang build (brew install llvm) as lld isn't a thing on the default clang for some fucking reason
• llvm-objcopy --dump-section .text=target.bin a.out -> dump text section (should just be _start) to bin

Usage

• Open target.bin and flash.bin in a hex editor
• Overwrite post-initialization main function in flash.bin with target.bin contents (file offset 0x1E8) with your favorite hex editor of choice (make sure you overwrite bytes, not insert new ones)
• Reflash over to the device
• Press buttons and have fun!