Follow the instructions here to download the executable for your operating system: https://github.com/Massdrop/mdloader/releases
Plug in your keyboard.
Press the reset button on your keyboard.
In your terminal, change to the directory where you downloaded the executable and applet-*.bin file(s).
Windows - Run
mdloader_windows.exe --first --download FILE_NAME --restart. Replace "FILE_NAME" with the filename of your compiled firmware.
Linux - Run
mdloader_linux --first --download FILE_NAME --restart. Replace "FILE_NAME" with the filename of your compiled firmware.
Mac - Run
mdloader_mac --first --download FILE_NAME --restart. If you downloaded with Mac Safari, run
mdloader_mac.dms --first --download FILE_NAME --restart. Replace "FILE_NAME" with the filename of your compiled firmware.
Massdrop Loader is used to read firmware from and write firmware to Massdrop keyboards which utilize Microchip's SAM-BA bootloader, over the USB connection.
Supported operating systems
Windows XP or greater (32-bit and 64-bit versions, USB Serial driver in drv_win folder)
Linux x86 (32-bit and 64-bit versions)
Mac OS X
Massdrop keyboard's featuring Microchip's SAM-BA bootloader.
Enter mdloader directory where Makefile is located and excute:
This will create a
build directory with the compiled executable and required applet-*.bin files.
./build/mdloader to test.
Note that the target MCU applet file must exist in the directory the executable is called from.
Usage: mdloader [options] ... -h --help Print this help message -v --verbose Print verbose messages -V --version Print version information -f --first Use first found device port as programming port -l --list Print valid attached devices for programming -p --port port Specify programming port -U --upload file Read firmware from device into <file> -a --addr address Read firmware starting from <address> -s --size size Read firmware size of <size> -D --download file Write firmware from <file> into device -t --test Test mode (download/upload writes disabled, upload outputs data to stdout, restart disabled) --cols count Hex listing column count <count>  --colw width Hex listing column width <width>  --restart Restart device after successful programming
To write firmware to the device and restart it:
mdloader --first --download new_firmware.hex --restart
The program will now be searching for your device. Press the reset switch found through the small hole on the back case or by appropriate key sequence to enter programming mode and allow programming to commence.
Firmware may be provided as a binary ending in .bin or an Intel HEX format ending in .hex, but .hex is preferred for data integrity.
Note that safeguards are in place to prevent overwriting the bootloader section of the device.
To read firmware from the device:
mdloader --first --upload read_firmware.bin --addr 0x4000 --size 0x10000
Where --addr and --size are set as desired.
Note the output of reading firmware will be in binary format.
Test mode may be invoked with the --test switch to test operations while preventing firmware modification.
Test mode also allows viewing of binary data from a read instead of writing to a file.
Linux: User may need to be added to group dialout to access programming port