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

CMSIS_CORE_DIR 		?= upstream/cmsis-core
CMSIS_DEVICE_DIR 	?= upstream/cmsis-device-f3
MUSL_DIR			?= upstream/musl
TINYPRINTF_DIR		?= upstream/tinyprintf
SQUARE_DIR			?= upstream/stm32square

########################################################################################################################
# Algorithm parameters
########################################################################################################################

# - none -

########################################################################################################################
# High-level build parameters
########################################################################################################################

DEBUG			?= 1
OPT				?= 0

BUILDDIR 		?= build
BINARY 			:= rotohsm_proto_rotor.elf
LDSCRIPT 		:= generic_stm32.ld
DEVICE 			:= STM32F302CB


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

STARTUP_FILE 		:= $(CMSIS_DEVICE_DIR)/Source/Templates/gcc/startup_stm32f302xc.s

ASM_SOURCES 		:= $(STARTUP_FILE)

C_SOURCES		 	:= src/main.c
C_SOURCES		 	+= src/microcobs.c
C_SOURCES		 	+= src/crc32.c
C_SOURCES		 	+= upstream/tinyprintf/tinyprintf.c

CPP_SOURCES			:= # - none -

MUSL_SOURCES		:= # - none -
MUSL_SOURCES		:= $(addprefix $(MUSL_DIR)/src/,$(MUSL_SOURCES))

C_SOURCES += $(MUSL_SOURCES)


########################################################################################################################
# Low-level build parameters
########################################################################################################################

PREFIX		?= arm-none-eabi-

HOSTCC		:= gcc
CC			:= $(PREFIX)gcc
CPP			:= $(PREFIX)cpp
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

MUSL_DIR_ABS			:= $(abspath $(MUSL_DIR))
CMSIS_CORE_DIR_ABS		:= $(abspath $(CMSIS_CORE_DIR))
CMSIS_DEVICE_DIR_ABS	:= $(abspath $(CMSIS_DEVICE_DIR))

DEVICE_FAMILY	:= $(shell echo $(DEVICE) | egrep -io 'STM32[a-z]{1,2}[0-9]'|cut -c 6-)
DEVICE_DEFINES 	:= -DSTM32$(DEVICE_FAMILY) $(addprefix -D,$(shell cat $(SQUARE_DIR)/buildinfo/$(DEVICE_FAMILY)/$(DEVICE).defines))
FAMILY_HEADER	:= $(shell ls $(CMSIS_DEVICE_DIR)/Include | grep -i '^STM32$(DEVICE_FAMILY)xx.h')

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

COMMON_CFLAGS	+= -I$(abspath include)
COMMON_CFLAGS	+= -I$(CMSIS_CORE_DIR_ABS)/Include 
COMMON_CFLAGS	+= -I$(BUILDDIR)

CFLAGS			+= -I$(abspath tools/musl_include_shims)
CFLAGS			+= -I$(abspath $(TINYPRINTF_DIR))
CFLAGS			+= -I$(CMSIS_DEVICE_DIR_ABS)/Include

CFLAGS			+= $(ARCH_FLAGS) $(SYSTEM_FLAGS)
CFLAGS			+= -fno-common -ffunction-sections -fdata-sections

COMMON_CFLAGS	+= -O$(OPT) -std=gnu11 -g
COMMON_CFLAGS 	+= $(DEVICE_DEFINES)
COMMON_CFLAGS 	+= -DDEBUG=$(DEBUG)

HOST_CFLAGS		+= $(COMMON_CFLAGS)

# for musl
CFLAGS			+= -Dhidden=

SIM_CFLAGS	+= -lm -DSIMULATION
SIM_CFLAGS	+= -Wall -Wextra -Wpedantic -Wshadow -Wimplicit-function-declaration -Wundef -Wno-unused-parameter

INT_CFLAGS	+= -Wall -Wextra -Wpedantic -Wshadow -Wimplicit-function-declaration -Wundef -Wno-unused-parameter
INT_CFLAGS	+= -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes

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.o --trace-sections .isr_vector --highlight-subdirs $(BUILDDIR)

OBJS := $(addprefix $(BUILDDIR)/,$(C_SOURCES:.c=.o) $(CXX_SOURCES:.cpp=.o) $(ASM_SOURCES:.s=.o))
ALL_OBJS := $(OBJS)
ALL_OBJS += $(BUILDDIR)/generated/stm32_system_patched.o
# Add generated source here.

########################################################################################################################
# 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/mem_defs.ldi: $(SQUARE_DIR)/ld_memmap/$(DEVICE_FAMILY)/$(DEVICE).ldi | $(BUILDDIR)/generated
	ln -sfr $< $@ 

$(BUILDDIR)/generated/stm32_device.h: $(CMSIS_DEVICE_DIR_ABS)/Include/$(FAMILY_HEADER) | $(BUILDDIR)/generated
	ln -sfr $< $@ 

$(BUILDDIR)/generated/stm32_system_patched.c: $(wildcard $(CMSIS_DEVICE_DIR_ABS)/Source/Templates/system_stm32*.c) | $(BUILDDIR)/generated
	$(PYTHON3) tools/patch_system_init.py $< > $@

$(BUILDDIR)/generated/stm32_irqs.h: $(STARTUP_FILE) | $(BUILDDIR)/generated
	$(PYTHON3) tools/gen_isr_header.py --generate-include-guards --use-cpp $(CPP) $< > $@

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

.PRECIOUS: $(BUILDDIR)/$(BINARY) 
$(BUILDDIR)/$(BINARY) $(BUILDDIR)/$(BINARY:.elf=.map) &: $(ALL_OBJS) $(LDSCRIPT) $(BUILDDIR)/generated/mem_defs.ldi
	$(LD) -T$(LDSCRIPT) $(LDFLAGS) -o $@ -Wl,-Map=$(BUILDDIR)/$(BINARY:.elf=.map) $(ALL_OBJS) $(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)/src/%.o: src/%.s
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) -o $@ -c $<

$(BUILDDIR)/src/%.o: src/%.c $(BUILDDIR)/generated/stm32_irqs.h $(BUILDDIR)/generated/stm32_device.h
	mkdir -p $(@D)
	$(CC) $(COMMON_CFLAGS) $(CFLAGS) $(INT_CFLAGS) -o $@ -c $<

$(BUILDDIR)/src/%.o: src/%.cpp $(BUILDDIR)/generated/stm32_irqs.h $(BUILDDIR)/generated/stm32_device.h
	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 $<

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

$(BUILDDIR)/crc32_test: src/crc32.c test/crc32_test.c
	$(HOSTCC) $(HOST_CFLAGS) -o $@ -Isrc $^

$(BUILDDIR)/microcobs_test_sg: src/microcobs.c test/microcobs_test_sg.c
	$(HOSTCC) $(HOST_CFLAGS) -o $@ -Isrc $^

$(BUILDDIR)/microcobs_test: src/microcobs.c test/microcobs_test.c
	$(HOSTCC) $(HOST_CFLAGS) -o $@ -Isrc $^

$(BUILDDIR)/microcobs_decode_test: src/microcobs.c test/microcobs_decode_test.c
	$(HOSTCC) $(HOST_CFLAGS) -o $@ -Isrc $^

.PHONY: run_tests
run_tests: $(BUILDDIR)/crc32_test $(BUILDDIR)/microcobs_test_sg $(BUILDDIR)/microcobs_test $(BUILDDIR)/microcobs_decode_test
	$(PYTHON3) -m unittest test.crc32_ref
	$(PYTHON3) -m unittest test.microcobs

venv:
	test -d venv || python3 -m venv --system-site-packages venv
	source venv/bin/activate && pip install cxxfilt pyelftools libarchive matplotlib

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)/crc32_test
	rm -f $(BUILDDIR)/microcobs_test_sg
	rm -f $(BUILDDIR)/microcobs_test
	rm -f $(BUILDDIR)/microcobs_decode_test

mrproper: clean
	rm -rf build

.PHONY: clean mrproper

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