# CPU frequency divided by two since AVR is at 3.3 V F_CPU = 8000000 # External oscillator is 16 MHz F_USB = 16000000 RGB_MATRIX_CUSTOM_KB = yes # Custom keyboard effects # Add System76 EC command interface as well as I2C and USB mux drivers SRC += system76_ec.c usb_mux.c I2C_DRIVER_REQUIRED = yes