# ---------------------------------------
# Common make definition for all examples
# ---------------------------------------

# upper helper function
to_upper = $(subst a,A,$(subst b,B,$(subst c,C,$(subst d,D,$(subst e,E,$(subst f,F,$(subst g,G,$(subst h,H,$(subst i,I,$(subst j,J,$(subst k,K,$(subst l,L,$(subst m,M,$(subst n,N,$(subst o,O,$(subst p,P,$(subst q,Q,$(subst r,R,$(subst s,S,$(subst t,T,$(subst u,U,$(subst v,V,$(subst w,W,$(subst x,X,$(subst y,Y,$(subst z,Z,$(subst -,_,$(1))))))))))))))))))))))))))))

#-------------------------------------------------------------
# Toolchain
# Can be changed via TOOLCHAIN=gcc|clang or CC=arm-none-eabi-gcc|clang
#-------------------------------------------------------------
ifneq (,$(findstring clang,$(CC)))
  TOOLCHAIN = clang
else ifneq (,$(findstring gcc,$(CC)))
  TOOLCHAIN = gcc
endif

# Default to GCC
ifndef TOOLCHAIN
  TOOLCHAIN = gcc
endif

#-------------- TOP and EXAMPLE_PATH ------------

# Set TOP to be the path to get from the current directory (where make was invoked) to the top of the tree.
# $(lastword $(MAKEFILE_LIST)) returns the name of this makefile relative to where make was invoked.
THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))

# Set TOP to an absolute path
TOP = $(abspath $(subst family_support.mk,../..,$(THIS_MAKEFILE)))

# Set EXAMPLE_PATH to the relative path from TOP to the current directory, ie examples/device/cdc_msc
EXAMPLE_PATH = $(subst $(TOP)/,,$(abspath .))

#-------------- Linux/Windows ------------
# Detect whether shell style is windows or not
# https://stackoverflow.com/questions/714100/os-detecting-makefile/52062069#52062069
ifeq '$(findstring ;,$(PATH))' ';'
# PATH contains semicolon - so we're definitely on Windows.
CMDEXE := 1

# makefile shell commands should use syntax for DOS CMD, not unix sh
# Force DOS command shell on Windows.
SHELL := cmd.exe
endif

ifeq ($(CMDEXE),1)
  CP = copy
  RM = del
  MKDIR = mkdir
  PYTHON = python
else
  CP = cp
  RM = rm
  MKDIR = mkdir
  PYTHON = python3
endif

# Build directory
BUILD := _build/$(BOARD)

PROJECT := $(notdir $(CURDIR))

#-------------------------------------------------------------
# Family and Board
#-------------------------------------------------------------
BOARD_PATH := $(subst $(TOP)/,,$(wildcard $(TOP)/hw/bsp/*/boards/$(BOARD)))
FAMILY := $(word 3, $(subst /, ,$(BOARD_PATH)))
FAMILY_PATH = hw/bsp/$(FAMILY)

ifeq ($(BOARD_PATH),)
  $(info You must provide a BOARD parameter with 'BOARD=')
  $(error Invalid BOARD specified)
endif

# Include Family and Board specific defs
include $(TOP)/$(FAMILY_PATH)/family.mk
SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(FAMILY_PATH)/*.c))

#-------------------------------------------------------------
# Source files and compiler flags
#-------------------------------------------------------------
# tinyusb makefile
include $(TOP)/src/tinyusb.mk
SRC_C += $(TINYUSB_SRC_C)

# Include all source C in family & board folder
SRC_C += hw/bsp/board.c
SRC_C += $(subst $(TOP)/,,$(wildcard $(TOP)/$(BOARD_PATH)/*.c))

INC += \
  $(TOP)/$(FAMILY_PATH) \
  $(TOP)/src \
  $(TOP)/hw \

BOARD_UPPER = $(call to_upper,$(BOARD))
CFLAGS += -DBOARD_$(BOARD_UPPER)

ifdef CFLAGS_CLI
	CFLAGS += $(CFLAGS_CLI)
endif

# use max3421 as host controller
ifeq (${MAX3421_HOST},1)
  SRC_C += src/portable/analog/max3421/hcd_max3421.c
  CFLAGS += -DCFG_TUH_MAX3421=1
endif

# Log level is mapped to TUSB DEBUG option
ifneq ($(LOG),)
  CFLAGS += -DCFG_TUSB_DEBUG=$(LOG)
endif

# Logger: default is uart, can be set to rtt or swo
ifeq ($(LOGGER),rtt)
  CFLAGS += -DLOGGER_RTT
  #CFLAGS += -DSEGGER_RTT_MODE_DEFAULT=SEGGER_RTT_MODE_BLOCK_IF_FIFO_FULL
  INC   += $(TOP)/lib/SEGGER_RTT/RTT
  SRC_C += lib/SEGGER_RTT/RTT/SEGGER_RTT.c
endif
ifeq ($(LOGGER),swo)
  CFLAGS += -DLOGGER_SWO
else
  CFLAGS += -DLOGGER_UART
endif

# CPU specific flags
ifdef CPU_CORE
  include ${TOP}/examples/build_system/make/cpu/$(CPU_CORE).mk
endif

# toolchain specific - select based on CPU architecture
ifdef CPU_CORE
  ifneq (,$(filter cortex% arm%,$(CPU_CORE)))
    # ARM/Cortex architecture
    include ${TOP}/examples/build_system/make/toolchain/arm_$(TOOLCHAIN).mk
  else ifneq (,$(filter rv%,$(CPU_CORE)))
    # RISC-V architecture
    include ${TOP}/examples/build_system/make/toolchain/riscv_$(TOOLCHAIN).mk
  else
    $(error Unsupported CPU_CORE architecture: $(CPU_CORE). Must start with cortex, arm, or rv)
  endif
else
  # Default to ARM if CPU_CORE not specified
  include ${TOP}/examples/build_system/make/toolchain/arm_$(TOOLCHAIN).mk
endif

#---------------------- FreeRTOS -----------------------
FREERTOS_SRC = lib/FreeRTOS-Kernel
FREERTOS_PORTABLE_PATH = $(FREERTOS_SRC)/portable/GCC

ifeq ($(RTOS),freertos)
	SRC_C += \
		$(FREERTOS_SRC)/list.c \
		$(FREERTOS_SRC)/queue.c \
		$(FREERTOS_SRC)/tasks.c \
		$(FREERTOS_SRC)/timers.c \
		$(subst $(TOP)/,,$(wildcard $(TOP)/$(FREERTOS_PORTABLE_SRC)/*.c))

	SRC_S += $(subst $(TOP)/,,$(wildcard $(TOP)/$(FREERTOS_PORTABLE_SRC)/*.s))
	INC += \
		$(TOP)/hw/bsp/$(FAMILY)/FreeRTOSConfig \
		$(TOP)/$(FREERTOS_SRC)/include \
		$(TOP)/$(FREERTOS_PORTABLE_SRC)

	CFLAGS += -DCFG_TUSB_OS=OPT_OS_FREERTOS

	# Suppress FreeRTOSConfig.h warnings
	CFLAGS += -Wno-error=redundant-decls

	# Suppress FreeRTOS source warnings
	CFLAGS += -Wno-error=cast-qual
	CFLAGS += -Wno-error=null-dereference

	# FreeRTOS (lto + Os) linker issue
	LDFLAGS += -Wl,--undefined=vTaskSwitchContext
endif

#---------------- Helper ----------------
check_defined = \
    $(strip $(foreach 1,$1, \
    $(call __check_defined,$1,$(strip $(value 2)))))
__check_defined = \
    $(if $(value $1),, \
    $(error Undefined make flag: $1$(if $2, ($2))))
