# CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
F_USB ?= $(F_CPU)
-# Interrupt driven control endpoint task. Do not enable this.
-# This blocks long for capslock and etc. and can prevent signal handling.
-#OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
# This improves response of keyboard when wakeup
OPT_DEFS += -DSUSPEND_MODE_STANDBY