# name of your application
  APPLICATION = gpio_to_serial
  
  # If no BOARD is found in the environment, use this default:
  BOARD ?= native
  
  # This has to be the absolute path to the RIOT base directory:
  RIOTBASE ?= $(CURDIR)/../..
  
  USEMODULE += xtimer
  FEATURES_REQUIRED += periph_gpio
  FEATURES_REQUIRED += periph_uart
  
  # Comment this out to disable code in RIOT that does safety checking
  # which is not needed in a production environment but helps in the
  # development process:
  CFLAGS += -DDEVELHELP
  
  # Change this to 0 show compiler invocation lines by default:
  QUIET ?= 1
  
  include $(RIOTBASE)/Makefile.include