CROSS ?= arm-none-eabi-

CC      := $(CROSS)gcc
CXX     := $(CROSS)c++
AS      := $(CROSS)as
OBJCOPY := $(CROSS)objcopy
LD      := $(CROSS)ld
SIZE    := $(CROSS)size
GDB     := $(CROSS)gdb

OOCD           ?= openocd
#OOCD_INTERFACE ?= stlink-v2-1
#OOCD_TRANSPORT ?= hla_swd
#OOCD_INTERFACE ?= cmsis-dap
OOCD_INTERFACE ?= jlink
OOCD_TRANSPORT ?= swd
OOCD_TARGET    ?= stm32f4x

top_dir     := $(shell pwd)
cmsis_dir   := $(top_dir)/cmsis
dsp_dir     := $(cmsis_dir)/dsp/Source
stdph_dir   := $(top_dir)/stdperiph
lib_dir     := $(top_dir)/lib
usb_dir     := $(top_dir)/usb
codec2_dir  := $(top_dir)/codec2
scripts_dir := $(top_dir)/scripts

specs  := --specs=nosys.specs --specs=nano.specs

#debug ?= 1
ifeq ($(debug),1)
	debug_flags := -O0 -g -ggdb
else
	debug_flags := -Os -DNDEBUG -fno-strength-reduce -fomit-frame-pointer

endif

cmsis_startup :=
cmsis_srcs    :=
objs          :=
TARGET_CFLAGS :=
TARGET_LDFLAGS:=

CFLAGS += -I$(cmsis_dir)/inc \
			 -I$(stdph_dir)/inc \

COMM_CFLAGS += -mlittle-endian -mthumb -fno-common -Wall -ffunction-sections -fdata-sections \
		   -ffreestanding -nostartfiles -Wno-unused-function -fno-builtin -mcpu=cortex-m4 -march=armv7e-m \
		   -fno-strict-aliasing -Wshadow -pipe \

include $(lib_dir)/lib.mk

#target ?= vocoder
target ?= xc_ppf1901

target_dir := $(top_dir)/targets/$(target)

-include $(target_dir)/target.mk

link_script ?= $(scripts_dir)/stm32f4x.lds
iap_script  ?= iap.ld

CFLAGS += -I$(target_dir)

FP_FLAGS ?= -mfloat-abi=hard -mfpu=fpv4-sp-d16 -D__FPU_USED=1 -D__FPU_PRESENT=1

ARCHCCVERSION = ${shell $(CC) -v 2>&1 | sed -n '/^gcc version/p' | sed -e 's/^gcc version \([0-9\.]\)/\1/g' -e 's/[-\ ].*//g' -e '1q'}
ARCHCCMAJOR = ${shell echo $(ARCHCCVERSION) | cut -d'.' -f1}

TARGET_CFLAGS += $(FP_FLAGS)
TARGET_CFLAGS += $(COMM_CFLAGS)
TARGET_CFLAGS += -DUSE_STDPERIPH_DRIVER

CFLAGS  += -std=gnu99 
CFLAGS  += $(debug_flags)

LDFLAGS += -L$(scripts_dir)
LDFLAGS += -Xlinker --gc-sections
LDFLAGS += -Xlinker --print-memory-usage
LDFLAGS += -Xlinker -nostdlib 
LDFLAGS += -Xlinker --sort-section=alignment -mcpu=cortex-m4 $(FP_FLAGS)

ROMBASE ?= 0x08000000
ROMSZ   ?= 2048k
RAMBASE ?= 0x20000000
RAMSZ   ?= 192k

stdph_srcs := \
	$(stdph_dir)/src/misc.c \
	$(stdph_dir)/src/stm32f4xx_adc.c \
	$(stdph_dir)/src/stm32f4xx_can.c \
	$(stdph_dir)/src/stm32f4xx_cec.c \
	$(stdph_dir)/src/stm32f4xx_crc.c \
	$(stdph_dir)/src/stm32f4xx_cryp_aes.c \
	$(stdph_dir)/src/stm32f4xx_cryp.c \
	$(stdph_dir)/src/stm32f4xx_cryp_des.c \
	$(stdph_dir)/src/stm32f4xx_cryp_tdes.c \
	$(stdph_dir)/src/stm32f4xx_dac.c \
	$(stdph_dir)/src/stm32f4xx_dbgmcu.c \
	$(stdph_dir)/src/stm32f4xx_dcmi.c \
	$(stdph_dir)/src/stm32f4xx_dfsdm.c \
	$(stdph_dir)/src/stm32f4xx_dma2d.c \
	$(stdph_dir)/src/stm32f4xx_dma.c \
	$(stdph_dir)/src/stm32f4xx_dsi.c \
	$(stdph_dir)/src/stm32f4xx_exti.c \
	$(stdph_dir)/src/stm32f4xx_flash.c \
	$(stdph_dir)/src/stm32f4xx_flash_ramfunc.c \
	$(stdph_dir)/src/stm32f4xx_fmpi2c.c \
	$(stdph_dir)/src/stm32f4xx_gpio.c \
	$(stdph_dir)/src/stm32f4xx_hash.c \
	$(stdph_dir)/src/stm32f4xx_hash_md5.c \
	$(stdph_dir)/src/stm32f4xx_hash_sha1.c \
	$(stdph_dir)/src/stm32f4xx_i2c.c \
	$(stdph_dir)/src/stm32f4xx_iwdg.c \
	$(stdph_dir)/src/stm32f4xx_lptim.c \
	$(stdph_dir)/src/stm32f4xx_ltdc.c \
	$(stdph_dir)/src/stm32f4xx_pwr.c \
	$(stdph_dir)/src/stm32f4xx_qspi.c \
	$(stdph_dir)/src/stm32f4xx_rcc.c \
	$(stdph_dir)/src/stm32f4xx_rng.c \
	$(stdph_dir)/src/stm32f4xx_rtc.c \
	$(stdph_dir)/src/stm32f4xx_sai.c \
	$(stdph_dir)/src/stm32f4xx_sdio.c \
	$(stdph_dir)/src/stm32f4xx_spdifrx.c \
	$(stdph_dir)/src/stm32f4xx_spi.c \
	$(stdph_dir)/src/stm32f4xx_syscfg.c \
	$(stdph_dir)/src/stm32f4xx_tim.c \
	$(stdph_dir)/src/stm32f4xx_usart.c \
	$(stdph_dir)/src/stm32f4xx_wwdg.c \

ifeq ($(use_usb),1)
include $(usb_dir)/usb.mk
objs += $(usb_objs)
endif

ifeq ($(use_codec2),1)
include $(codec2_dir)/codec2.mk
CFLAGS += -DENABLE_CODEC2
objs += $(codec2_objs)
endif

CFLAGS  += $(TARGET_CFLAGS)
ASFLAGS += $(TARGET_CFLAGS)
LDFLAGS += $(TARGET_LDFLAGS)

cmsis_srcs += \
	  $(cmsis_dir)/src/system_stm32f4xx.c

objs += $(lib_objs)

objs += $(cmsis_startup:.S=.o) $(cmsis_srcs:.c=.o)
objs += $(stdph_srcs:.c=.o)

firmware_objs := $(objs) $(${target}_objs)
iap_objs := $(objs) $(iap_srcs:.c=.o)

BINARY ?= $(target)

all: firmware

iap : iap.bin iap.hex

firmware : $(BINARY).bin $(BINARY).hex

$(BINARY).elf: | $(link_script)

%.hex : %.elf
	$(OBJCOPY) -O ihex $< $@

%.bin : %.elf
	$(OBJCOPY) -O binary $< $@

$(BINARY).elf : $(firmware_objs)
	@echo "linking $@"
	@$(CC) $(LDFLAGS) -Wl,-Map="$@.map" -T $(link_script) -u_printf_float $(specs) $^ -o $@
	@$(SIZE) -Bd $@

iap.elf : $(iap_objs)
	@echo "linking $@"
	@$(CC) $(LDFLAGS) -Wl,-Map="$@.map" -T $(iap_script) $(specs) $^ -o $@ 
	@$(SIZE) -Bd $@

%.o : %.s
	@echo "compiling $(notdir $<)"
	@$(CC) $(CFLAGS) -c $< -o $@

%.o : %.c
	@echo "compiling $(notdir $<)"
	@$(CC) $(CFLAGS) -c $< -o $@

%.o : %.S
	@echo "compiling $(notdir $<)"
	@$(CC) $(CFLAGS) -c $< -o $@

%.lds : %.lds.S
	$(CC) -E -P -DROMBASE=$(ROMBASE) -DROMSZ=$(ROMSZ) -DRAMBASE=$(RAMBASE) -DRAMSZ=$(RAMSZ) -o $@ $<

ifeq ($(OOCD_FILE),)
flash: $(BINARY).elf
	@printf "  FLASH   $<\n"
	(echo "halt; program $(realpath $(*).elf) verify reset" | nc -4 localhost 4444 2>/dev/null) || \
		$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
		-c "transport select $(OOCD_TRANSPORT)" \
		-f target/$(OOCD_TARGET).cfg \
		-c "program $(BINARY).elf verify reset exit" \
		$(NULL)
else
flash: $(BINARY).elf
	@printf "  FLASH   $<\n"
	(echo "halt; program $(realpath $(*).elf) verify reset" | nc -4 localhost 4444 2>/dev/null) || \
		$(OOCD) -f $(OOCD_FILE) \
		-c "program $(BINARY).elf verify reset exit" \
		$(NULL)
endif

boot.elf : $(scripts_dir)/boot.S iap.bin $(BINARY).bin
	@ln -sf $(BINARY).bin firmware.bin
	$(CC) -nostdlib $< -o $@ -T $(scripts_dir)/boot.ld

boot.bin : boot.elf
	$(OBJCOPY) -O binary $< $@

download: boot.bin
	$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
		-c "transport select $(OOCD_TRANSPORT)" \
		-f target/$(OOCD_TARGET).cfg \
		-c "init" -c "reset init" -c "halt" \
		-c "flash write_image erase $^ 0x08000000" \
		-c "reset run" -c "shutdown"

st-flash: $(BINARY).hex
	st-flash --format ihex write $<

debug: $(BINARY).elf
	$(GDB) $^ -x $(top_dir)/gdb/init.gdb

clean:
	@rm -rf $(objs) $(firmware_objs) $(iap_objs) $(scripts_dir)/*.lds *.o

distclean: clean
	@rm -rf *.map *.elf  *.bin  *.hex