# CPU clock adjust registers or the clock division fuses), this will be equal to F_CPU.
F_USB ?= $(F_CPU)
+# TODO: This can prevent converter ISR from handling signal instantly, better remove it.
+# Without this option debug prints from enable_break() won't be displayed comopletely.
+OPT_DEFS += -DINTERRUPT_CONTROL_ENDPOINT
+
# Boot Section Size in *bytes*
# Teensy halfKay 512