.PHONY: all clean flash gdbserver gdb jlinkexe rtt

APP_ROOT=.
MONGOOSE_ROOT=../..

BUILD_DIR=.build
OUT_DIR=out
PROJECT=example

NRF_IOT_SDK_ROOT=/opt/nrf5_iot_sdk
GNU_PREFIX := arm-none-eabi

LD_PATH=$(APP_ROOT)/ld

#echo suspend
ifeq ("$(VERBOSE)","1")
V := 
else
V := @
endif

# Toolchain commands
CC              := '$(GNU_PREFIX)-gcc'
AS              := '$(GNU_PREFIX)-as'
AR              := '$(GNU_PREFIX)-ar' -r
LD              := '$(GNU_PREFIX)-ld'
NM              := '$(GNU_PREFIX)-nm'
OBJDUMP         := '$(GNU_PREFIX)-objdump'
OBJCOPY         := '$(GNU_PREFIX)-objcopy'
SIZE            := '$(GNU_PREFIX)-size'

IPATH_SDK = . \
    $(NRF_IOT_SDK_ROOT)/components/iot/errno \
    $(NRF_IOT_SDK_ROOT)/components/softdevice/s1xx_iot/headers \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/common \
    $(NRF_IOT_SDK_ROOT)/components/softdevice/common/softdevice_handler \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/include \
    $(NRF_IOT_SDK_ROOT)/components/iot/ble_6lowpan \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/hal \
    $(NRF_IOT_SDK_ROOT)/components/ble/common \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/port \
    $(NRF_IOT_SDK_ROOT)/components/libraries/fifo \
    $(NRF_IOT_SDK_ROOT)/components/libraries/trace \
    $(NRF_IOT_SDK_ROOT)/components/device \
    $(NRF_IOT_SDK_ROOT)/components/libraries/uart \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/rng \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/config \
    $(NRF_IOT_SDK_ROOT)/components/libraries/mem_manager \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/uart \
    $(NRF_IOT_SDK_ROOT)/components/iot/ble_ipsp \
    $(NRF_IOT_SDK_ROOT)/components/libraries/scheduler \
    $(NRF_IOT_SDK_ROOT)/components/iot/iot_timer \
    $(NRF_IOT_SDK_ROOT)/components/iot/tls/mbedtls/tls/config \
    $(NRF_IOT_SDK_ROOT)/external/mbedtls/include \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/include/netif \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium/commissioning \
    $(NRF_IOT_SDK_ROOT)/components/iot/tls \
    $(NRF_IOT_SDK_ROOT)/components/iot/include \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/pstorage \
    $(NRF_IOT_SDK_ROOT)/components/iot/tls \
    $(NRF_IOT_SDK_ROOT)/components/iot/context_manager \
    $(NRF_IOT_SDK_ROOT)/components/iot_timer \
    $(NRF_IOT_SDK_ROOT)/components/toolchain/gcc \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/delay \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium/ble_ncfgs \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/gpiote \
    $(NRF_IOT_SDK_ROOT)/components/iot/mqtt \
    $(NRF_IOT_SDK_ROOT)/components/softdevice/s1xx_iot/headers/nrf52 \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/include/lwip \
    $(NRF_IOT_SDK_ROOT)/components/iot/common \
    $(NRF_IOT_SDK_ROOT)/components/libraries/timer \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/port/arch \
    $(NRF_IOT_SDK_ROOT)/components/libraries/button \
    $(NRF_IOT_SDK_ROOT)/components/libraries/util \
    $(NRF_IOT_SDK_ROOT)/examples/bsp \
    $(NRF_IOT_SDK_ROOT)/components/toolchain \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium/include \

IPATH_RTT = $(APP_ROOT)/rtt/RTT

IPATH_APP = $(APP_ROOT) $(APP_ROOT)/config

IPATH = .  $(IPATH_APP) $(IPATH_RTT) $(IPATH_SDK)

SOURCES_NRF_IOT_SDK = \
    $(NRF_IOT_SDK_ROOT)/examples/bsp/bsp.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/button/app_button.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/util/app_error.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/fifo/app_fifo.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/scheduler/app_scheduler.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/timer/app_timer.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/timer/app_timer_appsh.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/trace/app_trace.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/mem_manager/mem_manager.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/util/nrf_assert.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/uart/retarget.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/def.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/dhcp.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/dhcp6.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/dns.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv4/icmp.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/icmp6.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/inet6.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/inet_chksum.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/init.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv4/ip4.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv4/ip4_addr.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/ip6.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/ip6_addr.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/memp.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/mld6.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/ipv6/nd6.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/netif.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/port/nrf_platform_port.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/pbuf.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/raw.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/sys.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/tcp.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/tcp_in.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/tcp_out.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/timers.c \
    $(NRF_IOT_SDK_ROOT)/external/lwip/src/core/udp.c \
    $(NRF_IOT_SDK_ROOT)/components/libraries/uart/app_uart_fifo.c \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/delay/nrf_delay.c \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/common/nrf_drv_common.c \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/gpiote/nrf_drv_gpiote.c \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/uart/nrf_drv_uart.c \
    $(NRF_IOT_SDK_ROOT)/components/drivers_nrf/pstorage/pstorage.c \
    $(NRF_IOT_SDK_ROOT)/components/ble/common/ble_advdata.c \
    $(NRF_IOT_SDK_ROOT)/components/ble/common/ble_conn_params.c \
    $(NRF_IOT_SDK_ROOT)/components/ble/common/ble_srv_common.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/errno/errno.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/context_manager/iot_context_manager.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/iot_timer/iot_timer.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium/ipv6_medium_ble.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/common/ipv6_parse.c \
    $(NRF_IOT_SDK_ROOT)/components/toolchain/system_nrf52.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium/ble_ncfgs/ble_ncfgs.c \
    $(NRF_IOT_SDK_ROOT)/components/iot/medium/commissioning/commissioning.c \
    $(NRF_IOT_SDK_ROOT)/components/softdevice/common/softdevice_handler/softdevice_handler.c \
    $(NRF_IOT_SDK_ROOT)/components/softdevice/common/softdevice_handler/softdevice_handler_appsh.c \

SOURCES_RTT = \
    $(APP_ROOT)/rtt/RTT/SEGGER_RTT.c \
    $(APP_ROOT)/rtt/RTT/SEGGER_RTT_printf.c \
    $(APP_ROOT)/rtt/Syscalls/RTT_Syscalls_GCC.c \

SOURCES_APP = \
    $(APP_ROOT)/main.c \
    $(APP_ROOT)/bleconfig.c \
    $(MONGOOSE_ROOT)/mongoose.c \

SOURCES = $(SOURCES_APP) $(SOURCES_NRF_IOT_SDK) $(SOURCES_RTT)

LIBS  = $(NRF_IOT_SDK_ROOT)/components/iot/ble_6lowpan/lib/ble_6lowpan.a

ASM_SOURCES  = $(APP_ROOT)/gcc_startup_nrf52.s

LINKER_SCRIPT = $(LD_PATH)/mongoose_example_nrf52.ld

C_SOURCE_FILE_NAMES = $(notdir $(SOURCES))
C_PATHS = $(sort $(dir $(SOURCES) ) )
ASM_PATHS = $(sort $(dir $(ASM_SOURCES) ))
C_OBJECTS = $(addprefix $(BUILD_DIR)/, $(C_SOURCE_FILE_NAMES:.c=.o) )

ASM_SOURCE_FILE_NAMES = $(notdir $(ASM_SOURCES))
ASM_PATHS = $(sort $(dir $(ASM_SOURCES) ))
ASM_OBJECTS = $(addprefix $(BUILD_DIR)/, $(ASM_SOURCE_FILE_NAMES:.s=.o) )

INCDIRS = $(addprefix -I,$(IPATH))

vpath %.c $(C_PATHS)
vpath %.s $(ASM_PATHS)

OBJECTS = $(C_OBJECTS) $(ASM_OBJECTS)

# Mongoose features
MG_FEATURES_TINY = \
                   -DMG_DISABLE_HTTP_DIGEST_AUTH \
                   -DMG_DISABLE_MD5 \
                   -DMG_DISABLE_HTTP_KEEP_ALIVE \
                   -DMG_ENABLE_HTTP_SSI=0 \
                   -DMG_ENABLE_HTTP_STREAMING_MULTIPART \
                   -DMG_NO_BSD_SOCKETS

#flags common to all targets
CFLAGS  = -D__HEAP_SIZE=512
CFLAGS += -DSWI_DISABLE0
CFLAGS += -DSOFTDEVICE_PRESENT
CFLAGS += -DBOARD_PCA10040
CFLAGS += -DNRF52
CFLAGS += -DCONFIG_GPIO_AS_PINRESET
CFLAGS += -DBLE_STACK_SUPPORT_REQD
CFLAGS += -Ds1xx

CFLAGS += -mcpu=cortex-m4
CFLAGS += -mthumb -mabi=aapcs --std=gnu99
CFLAGS += -w -g3 -Os

CFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16

# keep every function in separate section. This will allow linker to dump
# unused functions
CFLAGS += -ffunction-sections -fdata-sections -fno-strict-aliasing
CFLAGS += -fno-builtin --short-enums

CFLAGS += -DCS_ENABLE_STDIO
#CFLAGS += -DCS_ENABLE_DEBUG

# This macro is needed for stdout to be retargeted to either UART or RTT
CFLAGS += -DENABLE_DEBUG_LOG_SUPPORT

# Don't retarget stdout to UART; it'll be retargeted to RTT
CFLAGS += -DNRF_LOG_USES_RTT

# Mongoose flags
CFLAGS += -DCS_PLATFORM=CS_P_NRF52 $(MG_FEATURES_TINY) -DMG_MODULE_LINES

LDFLAGS += -Xlinker -Map=$(OUT_DIR)/$(PROJECT).map
LDFLAGS += -mthumb -mabi=aapcs -L $(LD_PATH) -T$(LINKER_SCRIPT)
LDFLAGS += -mcpu=cortex-m4
LDFLAGS += -mfloat-abi=hard -mfpu=fpv4-sp-d16
# let linker to dump unused sections
LDFLAGS += -Wl,--gc-sections
# use newlib in nano version
LDFLAGS += --specs=nano.specs -lc -lnosys

# Assembler flags
ASMFLAGS += -x assembler-with-cpp
ASMFLAGS += -D__HEAP_SIZE=512
ASMFLAGS += -DSWI_DISABLE0
ASMFLAGS += -DSOFTDEVICE_PRESENT
ASMFLAGS += -DBOARD_PCA10040
ASMFLAGS += -DNRF52
ASMFLAGS += -DCONFIG_GPIO_AS_PINRESET
ASMFLAGS += -DENABLE_DEBUG_LOG_SUPPORT
ASMFLAGS += -DBLE_STACK_SUPPORT_REQD
ASMFLAGS += -Ds1xx
ASMFLAGS += -g3

INC_PATHS=$(addprefix -I,$(IPATH))

BUILD_DIRECTORIES := $(BUILD_DIR) $(OUT_DIR)

# Create objects from C SRC files
$(BUILD_DIR)/%.o: %.c
	@echo Compiling file: $(notdir $<)
	$(V)$(CC) $(CFLAGS) $(INC_PATHS) -c -o $@ $<

# Assemble files
$(BUILD_DIR)/%.o: %.s
	@echo Assembly file: $(notdir $<)
	$(V)$(CC) $(ASMFLAGS) $(INC_PATHS) -c -o $@ $<

# Create binary .hex file from the .out file
%.hex: %.out
	@echo Generating HEX file: $@
	$(V)$(OBJCOPY) -O ihex $< $@

OUT_FILENAME=$(OUT_DIR)/$(PROJECT).out
HEX_FILENAME=$(OUT_DIR)/$(PROJECT).hex

all: $(OUT_FILENAME) $(HEX_FILENAME)

$(OUT_FILENAME): $(BUILD_DIRECTORIES) $(OBJECTS)
	@echo Linking target: $(OUT_FILENAME)
	$(V)$(CC) $(LDFLAGS) $(OBJECTS) $(LIBS) -o $(OUT_FILENAME)

## Create build directories
$(BUILD_DIRECTORIES):
	mkdir $@

clean:
	rm -rf $(BUILD_DIR) $(OUT_DIR) \

# Flash the program
flash: $(HEX_FILENAME)
	@echo Flashing: $<
	/opt/nordic/nrfjprog/nrfjprog --program $< -f nrf52 --sectorerase
	/opt/nordic/nrfjprog/nrfjprog --reset -f nrf52

# start GDB server. It is needed to be done in a separate terminal before we
# can invoke `gdb` target
gdbserver:
	/opt/SEGGER/JLink_V610g/JLinkGDBServer -device NRF52 -speed 4000 -if SWD

# run GDB (for that to work, `make gdbserver` should run in parallel)
gdb:
	arm-none-eabi-gdb

# start JLinkExe; it is needed to be done in a separate terminal before we
# can invoke `rtt` target
jlinkexe:
	/opt/SEGGER/JLink_V610g/JLinkExe -device NRF52 -speed 4000 -if SWD

# run RTT client (for that to work, `make jlinkexe` should run in parallel)
rtt:
	/opt/SEGGER/JLink_V610g/JLinkRTTClient