ifneq (,$(filter periph_i2c,$(USEMODULE)))
  ifneq (,$(filter $(CPU),stm32f0 stm32f3 stm32f7 stm32l0 stm32l4))
    USEMODULE += periph_i2c_1
  else # stm32f1/f2/f4/l1
    USEMODULE += periph_i2c_2
  endif
endif