The ErgoDone is a modified version of the ErgoDox, made by K.T.E.C., with pre-soldered components. It has different wiring and uses a SparkFun Pro Micro instead of Teensy.
In the root directory of the repository, build the firmware with a command like:
make ergodone:default
For more information on the layout option and other ones, see the make
guide.
The ErgoDone uses a customized HID bootloader rather than the Teensy one. It doesn't need an OS driver, and the required actions before flashing are a little different than with an ErgoDox.
To enter flash mode, disconnect the keyboard first. Then, on the left-hand device, in the top row, press and hold the two rightmost keys while reconnecting the keyboard.
To flash the .hex file, use the hid_bootloader_cli
utlity from the TKG Toolkit (as of 2017-10-03, only this old version works under Windows):
hid_bootloader_cli -mmcu=atmega32u4 ergodone_default.hex