RIOT/sys/ztimer/Makefile.dep

#
# ztimer dependencies
#

# "ztimer" is the default meta-module of ztimer
ifneq (,$(filter ztimer,$(USEMODULE)))
  USEMODULE += ztimer_core
  USEMODULE += ztimer_convert_frac
  USEMODULE += ztimer_convert_shift
  DEFAULT_MODULE += auto_init_ztimer
  DEFAULT_MODULE += ztimer_init
endif

ifneq (,$(filter ztimer_xtimer_compat,$(USEMODULE)))
  USEMODULE += ztimer_usec
endif

ifneq (,$(filter ztimer64_xtimer_compat,$(USEMODULE)))
  USEMODULE += ztimer64_usec
  USEMODULE += ztimer_xtimer_compat
endif

ifneq (,$(filter ztimer_%,$(USEMODULE)))
  USEMODULE += ztimer_core
  USEMODULE += ztimer_extend
endif

ifneq (,$(filter ztimer_ondemand_%,$(USEMODULE)))
  USEMODULE += ztimer_ondemand
endif

ifneq (,$(filter ztimer_convert_%,$(USEMODULE)))
  USEMODULE += ztimer_convert
endif

ifneq (,$(filter ztimer_periph_lptimer,$(USEMODULE)))
  USEMODULE += ztimer_periph_timer
endif

ifneq (,$(filter ztimer_periph_timer,$(USEMODULE)))
  FEATURES_REQUIRED += periph_timer
endif

ifneq (,$(filter ztimer_periph_rtc,$(USEMODULE)))
  FEATURES_REQUIRED += periph_rtc
endif

ifneq (,$(filter ztimer_periph_rtt,$(USEMODULE)))
  FEATURES_REQUIRED += periph_rtt
endif

ifneq (,$(filter ztimer_periph_ptp,$(USEMODULE)))
  FEATURES_REQUIRED += periph_ptp_timer
endif

ifneq (,$(filter ztimer_convert_frac,$(USEMODULE)))
  USEMODULE += frac
endif

ifneq (,$(filter ztimer_usec,$(USEMODULE)))
  USEMODULE += ztimer
  USEMODULE += ztimer_periph_timer
endif

# NOTE: select the module here and not in the CPU so that order of inclusion
# does not have periph_rtt selected earlier that it should be while at the same
# time avoiding the module 'ztimer-no_periph_rtt' being included unecesarily.
# The samd21 rtt busy loops for 180us every time an alarm is set or
# the counter is read, this propagates and leads to timing errors
# on ztimer_msec that are higher than > +-1msec.
# The same goes for the fe310 rtt.
ifneq (,$(filter samd21 fe310,$(CPU)))
  USEMODULE += ztimer_no_periph_rtt
endif

ifneq (,$(filter ztimer_msec ztimer_sec,$(USEMODULE)))
  USEMODULE += ztimer
  ifeq (,$(filter ztimer_no_periph_rtt,$(USEMODULE)))
    FEATURES_OPTIONAL += periph_rtt
    # HACK: periph_rtt will get used only in the next iteration but an updated
    # state for FEATURES_USED is needed here so include `features_check.inc.mk`
    # here instead.
    # An other option would be to check FEATURES_PROVIDED this would avoid the
    # order of inclusion problem but it would no take into account possible conflicts
    # and is also currently not allowed in the build system.
    # An other alternative would be to delay to the next loop, but this produce a
    # case where another loop is not executed and the conditional not evaluated
    # If these kind of usecases pop up before Kconfig migration is completed
    # then another alternative would be introduce a variable to require an extra
    # loop independent of USEMODULE, FEATURES_REQUIRED and USEPKG
    include $(RIOTMAKE)/features_check.inc.mk
    ifneq (,$(filter periph_rtt,$(FEATURES_USED)))
      USEMODULE += ztimer_periph_rtt
    else
      USEMODULE += ztimer_periph_timer
    endif
  else
    USEMODULE += ztimer_periph_timer
  endif
endif