CROSS_COMPILE ?= /opt/gcc-arm-none-eabi-7-2018-q2-update/bin/arm-none-eabi-

TARGET_FILE ?= nrf.elf

CC = $(CROSS_COMPILE)gcc
CPP = $(CROSS_COMPILE)cpp
OBJCOPY = $(CROSS_COMPILE)objcopy

SRC_DIR = src
OBJ_DIR = obj
BIN_DIR = bin

NRF_PATH := nrf5sdk/

INCLUDES += include/

INCLUDES += $(NRF_PATH)components/
INCLUDES += $(NRF_PATH)modules/nrfx/mdk/
INCLUDES += $(NRF_PATH)components/libraries/strerror/
INCLUDES += $(NRF_PATH)components/softdevice/s132/headers/nrf52/
INCLUDES += $(NRF_PATH)components/toolchain/cmsis/include/
INCLUDES += $(NRF_PATH)components/libraries/util/
INCLUDES += $(NRF_PATH)components/libraries/balloc/
INCLUDES += $(NRF_PATH)components/libraries/ringbuf/
INCLUDES += $(NRF_PATH)modules/nrfx/hal/
INCLUDES += $(NRF_PATH)components/libraries/bsp/
INCLUDES += $(NRF_PATH)components/libraries/log/
INCLUDES += $(NRF_PATH)modules/nrfx/
INCLUDES += $(NRF_PATH)components/libraries/experimental_section_vars/
INCLUDES += $(NRF_PATH)components/softdevice/s132/headers/
INCLUDES += $(NRF_PATH)components/libraries/delay/
INCLUDES += $(NRF_PATH)integration/nrfx/
INCLUDES += $(NRF_PATH)components/libraries/atomic/
INCLUDES += $(NRF_PATH)components/boards/
INCLUDES += $(NRF_PATH)components/libraries/memobj/
INCLUDES += $(NRF_PATH)components/softdevice/common/
INCLUDES += $(NRF_PATH)external/fprintf/
INCLUDES += $(NRF_PATH)components/libraries/log/src/

CPP_FLAGS += $(addprefix -I, $(INCLUDES))

C_SRCS = $(wildcard $(SRC_DIR)/*.c)
C_OBJS = $(patsubst $(SRC_DIR)%,$(OBJ_DIR)%,$(patsubst %.c,%.o,$(C_SRCS)))

NRF_C_SRCS += $(NRF_PATH)components/libraries/log/src/nrf_log_frontend.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/log/src/nrf_log_str_formatter.c
NRF_C_SRCS += $(NRF_PATH)components/boards/boards.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/util/app_error.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/util/app_error_handler_gcc.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/util/app_error_weak.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/util/app_util_platform.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/util/nrf_assert.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/atomic/nrf_atomic.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/balloc/nrf_balloc.c
NRF_C_SRCS += $(NRF_PATH)external/fprintf/nrf_fprintf.c
NRF_C_SRCS += $(NRF_PATH)external/fprintf/nrf_fprintf_format.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/memobj/nrf_memobj.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/ringbuf/nrf_ringbuf.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/experimental_section_vars/nrf_section_iter.c
NRF_C_SRCS += $(NRF_PATH)components/libraries/strerror/nrf_strerror.c
NRF_C_SRCS += $(NRF_PATH)modules/nrfx/soc/nrfx_atomic.c
NRF_C_SRCS += $(NRF_PATH)modules/nrfx/mdk/system_nrf52.c
NRF_C_SRCS += $(NRF_PATH)components/softdevice/common/nrf_sdh.c
NRF_C_SRCS += $(NRF_PATH)components/softdevice/common/nrf_sdh_soc.c

NRF_C_OBJS = $(patsubst $(NRF_PATH)%,$(OBJ_DIR)/%,$(patsubst %.c,%.o,$(NRF_C_SRCS)))

NRF_A_SRCS = $(NRF_PATH)modules/nrfx/mdk/gcc_startup_nrf52.S
NRF_A_OBJS = $(patsubst $(NRF_PATH)%,$(OBJ_DIR)/%,$(patsubst %.S,%.o,$(NRF_A_SRCS)))

OBJS = $(NRF_A_OBJS) $(NRF_C_OBJS) $(C_OBJS)

TARGET = $(BIN_DIR)/$(TARGET_FILE)
TARGET_HEX = $(patsubst %.elf,%.hex,$(TARGET))
TARGET_PACKAGE = $(patsubst %.hex,%.zip,$(TARGET_HEX))
THIS_MAKEFILE := $(lastword $(MAKEFILE_LIST))

###################################################
OPT = 3
# C flags common to all targets
C_FLAGS += -O$(OPT) -g$(OPT)
C_FLAGS += -DBOARD_PCA10040
C_FLAGS += -DBSP_DEFINES_ONLY
C_FLAGS += -DCONFIG_GPIO_AS_PINRESET
C_FLAGS += -DFLOAT_ABI_HARD
C_FLAGS += -DNRF52
C_FLAGS += -DNRF52832_XXAA
C_FLAGS += -DNRF52_PAN_74
C_FLAGS += -DNRF_SD_BLE_API_VERSION=7
C_FLAGS += -DS132
C_FLAGS += -DSOFTDEVICE_PRESENT
C_FLAGS += -mcpu=cortex-m4
C_FLAGS += -mthumb -mabi=aapcs
C_FLAGS += -Wall -Werror
C_FLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# keep every function in a separate section, this allows linker to discard unused ones
C_FLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
C_FLAGS += -fno-builtin -fshort-enums

# Assembler flags common to all targets
A_FLAGS += -g$(OPT)
A_FLAGS += -mcpu=cortex-m4
A_FLAGS += -mthumb -mabi=aapcs
A_FLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
A_FLAGS += -DBOARD_PCA10040
A_FLAGS += -DBSP_DEFINES_ONLY
A_FLAGS += -DCONFIG_GPIO_AS_PINRESET
A_FLAGS += -DFLOAT_ABI_HARD
A_FLAGS += -DNRF52
A_FLAGS += -DNRF52832_XXAA
A_FLAGS += -DNRF52_PAN_74
A_FLAGS += -DNRF_SD_BLE_API_VERSION=7
A_FLAGS += -DS132
A_FLAGS += -DSOFTDEVICE_PRESENT

LINKER_SCRIPT = blinky_gcc_nrf52.ld
# Linker flags
LD_FLAGS += -O$(OPT) -g$(OPT)
LD_FLAGS += -mthumb -mabi=aapcs -L$(NRF_PATH)modules/nrfx/mdk -T$(LINKER_SCRIPT)
LD_FLAGS += -mcpu=cortex-m4
LD_FLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# let linker dump unused sections
LD_FLAGS += -Wl,--gc-sections
# use newlib in nano version
LD_FLAGS += --specs=nano.specs

C_FLAGS += -D__HEAP_SIZE=8192
C_FLAGS += -D__HEAP_SIZE=8192

A_FLAGS += -D__HEAP_SIZE=8192
A_FLAGS += -D__HEAP_SIZE=8192

# Add standard libraries at the very end of the linker input, after all objects
# that may need symbols provided by these libraries.
LIBS += c nosys m
###################################################

.PHONY: all install uninstall clean distclean debug package flash
all: $(TARGET)

debug:
	@echo $(TARGET_HEX)

clean:
	rm -f $(TARGET) $(TARGET_HEX) $(TARGET_PACKAGE)
	rm -f $(OBJS) $(patsubst %.o,%.d,$(OBJS))

distclean:
	rm -rf $(OBJ_DIR) $(BIN_DIR)

package: $(TARGET_HEX) $(THIS_MAKEFILE)
	nrfutil pkg generate --hw-version 52 --application-version 1 --application $(TARGET_HEX) --sd-req 0xCB --sd-id 0xCB --key-file keys/private.key $(TARGET_PACKAGE)

flash: $(TARGET_HEX) $(THIS_MAKEFILE)
	@echo Flashing: $(TARGET_HEX)
	nrfjprog -f nrf52 --program $(TARGET_HEX) --sectorerase
	nrfjprog -f nrf52 --reset

flash_softdevice:
	@echo Flashing: $(NRF_PATH)/components/softdevice/s132/hex/s132_nrf52_7.0.1_softdevice.hex
	nrfjprog -f nrf52 --program $(NRF_PATH)/components/softdevice/s132/hex/s132_nrf52_7.0.1_softdevice.hex --sectorerase
	nrfjprog -f nrf52 --reset

erase:
	nrfjprog -f nrf52 --eraseall

$(TARGET): $(OBJS) $(THIS_MAKEFILE)
	@mkdir -p $(BIN_DIR)
	$(CC) $(CC_FLAGS) $(LD_FLAGS) $(OBJS) $(addprefix -l,$(LIBS)) -o $@

$(TARGET_HEX): $(TARGET) $(THIS_MAKEFILE)
	$(OBJCOPY) -O ihex $(TARGET) $(TARGET_HEX)

$(OBJ_DIR)/%.d: $(SRC_DIR)/%.c
	@mkdir -p $(OBJ_DIR)/
	$(CPP) -MM -MF $@ -MP -MT $(patsubst %.d,%.o,$@) $(C_FLAGS) $(CPP_FLAGS) $(patsubst $(OBJ_DIR)/%.d,$(SRC_DIR)/%.c,$@)

$(OBJ_DIR)/%.d: $(NRF_PATH)/%.S
	@mkdir -p $(OBJ_DIR)/
	$(CPP) -MM -MF $@ -MP -MT $(patsubst %.d,%.o,$@) $(C_FLAGS) $(CPP_FLAGS) $(patsubst $(OBJ_DIR)/%.d,$(NRF_PATH)/%.S,$@)

$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c
	@mkdir -p $(OBJ_DIR)/
	$(CC) -c $(CPP_FLAGS) $(C_FLAGS) $< -o $@

$(OBJ_DIR)/%.o: $(NRF_PATH)/%.c
	@mkdir -p $(dir $@)
	$(CC) -std=c99 -MP -MD -c -o $@ $< $(C_FLAGS) $(CPP_FLAGS)

$(OBJ_DIR)/%.o: $(NRF_PATH)/%.S
	@mkdir -p $(dir $@)
	$(CC) -c $(ASMFLAGS) $< -o $@

ifneq ($(MAKECMDGOALS),clean)
-include $(patsubst %.o,%.d,$(OBJS))
endif