########################################################################################################################
# Dependency directories
########################################################################################################################

CMSIS_DEVICE_DIR 	?= lib/cmsis_device
CMSIS_CORE_DIR 		?= lib/cmsis_core
HAL_DIR				?= lib/hal_driver
MUSL_DIR			?= lib/musl

########################################################################################################################
# Sources
########################################################################################################################

C_SOURCES		:= src/main.c
C_SOURCES		+= src/cobs.c
C_SOURCES		+= src/clocks.c
C_SOURCES		+= src/bootloader.c
C_SOURCES		+= src/interrupts.c
C_SOURCES		+= src/system_stm32f3xx.c
C_SOURCES		+= config/fe_config.c

MUSL_SOURCES		+= string/strlen.c

C_SOURCES += $(addprefix $(MUSL_DIR)/src/,$(MUSL_SOURCES))

CXX_SOURCES			+=

BUILDDIR 	?= build
BINARY 		:= fenris_f302r8tx.elf
LDSCRIPT 	:= stm32f302r8tx.ld

########################################################################################################################
# Build parameters
########################################################################################################################

PREFIX		?= arm-none-eabi-

DEBUG		?= 1

CC			:= $(PREFIX)gcc
CXX			:= $(PREFIX)g++
LD			:= $(PREFIX)gcc
AR			:= $(PREFIX)ar
AS			:= $(PREFIX)as
SIZE		:= $(PREFIX)size
NM			:= $(PREFIX)nm
OBJCOPY		:= $(PREFIX)objcopy
OBJDUMP		:= $(PREFIX)objdump
GDB			:= $(PREFIX)gdb

HOST_CC				?= $(HOST_PREFIX)gcc
HOST_CXX			?= $(HOST_PREFIX)g++
HOST_LD				?= $(HOST_PREFIX)gcc
HOST_AR				?= $(HOST_PREFIX)ar
HOST_AS				?= $(HOST_PREFIX)as
HOST_OBJCOPY		?= $(HOST_PREFIX)objcopy
HOST_OBJDUMP		?= $(HOST_PREFIX)objdump

PYTHON3 ?= python3
DOT		?= dot

CMSIS_DIR_ABS 		:= $(abspath $(CMSIS_DIR))

ARCH_FLAGS		?= -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
SYSTEM_FLAGS	?= -nostdlib -ffreestanding -nostartfiles

CFLAGS				+= -Iinclude -Iconfig
CFLAGS				+= -I$(BUILDDIR)
CFLAGS				+= -I$(CMSIS_DEVICE_DIR)/Include -I$(CMSIS_CORE_DIR)/Include
CFLAGS				+= -I$(abspath include/musl_include_shims)

CFLAGS			+= -Os -std=gnu11 -g -DSTM32F302x8 -DSTM32F3 -DDEBUG=$(DEBUG)
CFLAGS			+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)
CFLAGS			+= -fno-common -ffunction-sections -fdata-sections

# for musl
CFLAGS			+= -Dhidden=

CXXFLAGS	+= -Os -g
CXXFLAGS	+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)
CXXFLAGS	+= -fno-common -ffunction-sections -fdata-sections
CXXFLAGS	+= -Wall -Wextra -Wshadow -Wundef -Wredundant-decls
CXXFLAGS	+= -I.

LDFLAGS			+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)

LIBS		+= -lgcc
LDFLAGS		+= -Wl,--gc-sections

LINKMEM_FLAGS ?= --trim-stubs=startup_stm32f302x8.o --trace-sections .isr_vector --highlight-subdirs $(BUILDDIR)

OBJS := $(addprefix $(BUILDDIR)/,$(C_SOURCES:.c=.o) $(CXX_SOURCES:.cpp=.o))

ALL_OBJS := $(OBJS)
ALL_OBJS += $(BUILDDIR)/startup_stm32f302x8.o

########################################################################################################################
# Rules
########################################################################################################################

all: binsize

.PHONY: binsize
binsize: $(BUILDDIR)/$(BINARY) $(BUILDDIR)/$(BINARY:.elf=-symbol-sizes.pdf)
	$(LD) -T$(LDSCRIPT) $(LDFLAGS) -Wl,--print-memory-usage -o /dev/null $(ALL_OBJS) $(LIBS)
	@echo
	@echo "▐▬▬▬▌ SyMbOL sIzE HiGhScORe LiSt ▐▬▬▬▌"
	$(NM) --print-size --size-sort --radix=d $< | tail -n 20

$(BUILDDIR)/generated: ; mkdir -p $@

.PRECIOUS: $(BUILDDIR)/$(BINARY) 
$(BUILDDIR)/$(BINARY) $(BUILDDIR)/$(BINARY:.elf=.map) &: $(ALL_OBJS)
	$(LD) -T$(LDSCRIPT) $(LDFLAGS) -o $@ -Wl,-Map=$(BUILDDIR)/$(BINARY:.elf=.map) $^ $(LIBS)

build/$(BINARY:.elf=-symbol-sizes.dot): $(ALL_OBJS)
	$(PYTHON3) tools/linkmem.py $(LINKMEM_FLAGS) $(LD) -T$(LDSCRIPT) $(LDFLAGS) $^ $(LIBS) > $@

%.pdf: %.dot
	$(DOT) -T pdf $< -o $@

%.dot: %.elf
	r2 -a arm -qc 'aa;agRd' $< 2>/dev/null >$@

$(BUILDDIR)/%.o: %.s
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) -o $@ -c $<

$(BUILDDIR)/src/%.o: src/%.c
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) -o $@ -c $<

$(BUILDDIR)/src/%.o: src/%.cpp
	mkdir -p $(@D)
	$(CXX) $(CXXFLAGS) -o $@ -c $<

$(BUILDDIR)/generated/%.o: $(BUILDDIR)/generated/%.c
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) -o $@ -c $<

$(BUILDDIR)/%.o: %.c
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(EXT_CFLAGS) -o $@ -c $<

clean:
	rm -rf $(BUILDDIR)/src
	rm -rf $(BUILDDIR)/generated
	rm -f $(BUILDDIR)/$(BINARY)
	rm -f $(BUILDDIR)/$(BINARY:.elf=.map)
	rm -f $(BUILDDIR)/$(BINARY:.elf=-symbol-sizes.dot)
	rm -f $(BUILDDIR)/$(BINARY:.elf=-symbol-sizes.pdf)
	rm -f $(BUILDDIR)/tools/freq_meas_test

mrproper: clean
	rm -rf build

.PHONY: clean mrproper

-include $(OBJS:.o=.d)