# export the CPU family so we can differentiate between them in the code
FAM = $(shell echo $(CPU_FAM) | tr 'a-z-' 'A-Z_')
export CFLAGS += -DCPU_FAM_$(FAM)

# this CPU implementation doesn't use CMSIS initialization
export CFLAGS += -DDONT_USE_CMSIS_INIT

# use common periph functions
USEMODULE += periph_common

# include sam21 common periph drivers
USEMODULE += sam21_common_periph

# export the common include directory
export INCLUDES += -I$(RIOTCPU)/sam21_common/include