FAM = $(shell echo $(CPU_FAM) | tr 'a-z-' 'A-Z_')
CFLAGS += -DCPU_FAM_$(FAM)

# include nrf5x common periph drivers
USEMODULE += nrf5x_common_periph

# link common cpu code
USEMODULE += cpu_common

INCLUDES += -I$(RIOTCPU)/nrf5x_common/include