The DM60 is powered by the Teensy 2.0 with the ATMEGA32U4 chip.
This is the modified code based off the tmk_keyboard library that was used to develop the software used for it.
Full build log can be found here: http://imgur.com/a/LTWew
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Get the tmk_keyboard software from here: https://github.com/tmk/tmk_keyboard
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Go to keyboard -> gh60 and delete keymap_poker.c file
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Insert the provided files from this repo into the GH60 directory.
3.1) If your layout uses a different pin configuration than what I have used (as specified in the matrix.c file) ensure that it is changed to the specific config that you have used.
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Make the hex file with "make -f Makefile" command whilst within the GH60 directory (requires avr-gcc compiler)
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Install the hex file using teensy bootloader, which can be found here: https://www.pjrc.com/teensy/loader.html
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Enjoy!