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_INTERFACE ?= jlink
OOCD_TARGET    ?= stm32f4x

top_dir   := $(shell pwd)
cmsis_dir := $(top_dir)/cmsis
stdph_dir := $(top_dir)/stdperiph
lib_dir   := $(top_dir)/lib
usb_dir   := $(top_dir)/usb

link_script := $(top_dir)/stm32f4x.lds
specs  := --specs=nosys.specs --specs=nano.specs

debug ?= 1
ifeq ($(debug),1)
	debug_flags := -O0 -g -ggdb
else
	debug_flags := -Os -DNDEBUG
endif

cmsis_startup :=
cmsis_srcs    :=

inc_flags += -I$(cmsis_dir)/inc \
			 -I$(stdph_dir)/inc \
			 -I$(lib_dir)/ \
			 -I$(top_dir)/src 

COMM_CFLAGS += -mthumb -fno-common -Wall -ffunction-sections -fdata-sections \
		   -ffreestanding -fno-builtin -mcpu=cortex-m4 

TARGET ?= f429

-include targets.mk

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

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

CFLAGS  += -std=gnu99 
CFLAGS  += $(debug_flags)
CFLAGS  += $(inc_flags)
CFLAGS  += $(TARGET_CFLAGS)
ASFLAGS += $(TARGET_CFLAGS)

LDFLAGS += -Xlinker --gc-sections -Xlinker --print-memory-usage \
		   -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)
usb_srcs := \
	$(usb_dir)/otg/src/usb_core.c \
	$(usb_dir)/otg/src/usb_dcd_int.c \
	$(usb_dir)/otg/src/usb_dcd.c \
	$(usb_dir)/core/src/usbd_core.c \
	$(usb_dir)/core/src/usbd_ioreq.c \
	$(usb_dir)/core/src/usbd_req.c \
	$(usb_dir)/cdc/src/usbd_cdc_core.c \

CFLAGS += -I$(usb_dir)/core/inc -I$(usb_dir)/otg/inc\
		  -I$(usb_dir)/cdc/inc -DUSE_USB_OTG_FS \
		  -DUSE_ULPI_PHY 

lib_srcs += $(lib_dir)/usb/usbd_cdc.c
lib_srcs += $(lib_dir)/usb/usbd_desc.c
lib_srcs += $(lib_dir)/usb/usb_bsp.c
CFLAGS += -I$(lib_dir)/usb
endif


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

lib_srcs += \
	  $(lib_dir)/gcc_stubs.c \
	  $(lib_dir)/printf.c \
	  $(lib_dir)/fifo.c \
	  $(lib_dir)/cmd.c \
	  $(lib_dir)/gpio.c \
	  $(lib_dir)/a3k.c \
	  $(lib_dir)/serial.c \
	  $(lib_dir)/fmc_sdram.c \

project_srcs += \
	  $(top_dir)/src/i2c.c \
	  $(top_dir)/src/main.c

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

firmware.elf: | $(link_script)

all: firmware.bin firmware.hex

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

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

firmware.elf : $(objs)
	$(CC) $(LDFLAGS) -Wl,-Map="$@.map" -T $(link_script) $(specs) $^ -o $@ 
	@$(SIZE) -Bd $@

%.o : %.s
	@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 $@ $<

BINARY := firmware
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 swd" \
		-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

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

clean:
	@rm -rf $(objs) *.lds

distclean: clean
	@rm -rf firmware.* tags