##
## This file is part of the libopencm3 project.
##
## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
## Copyright (C) 2010 Piotr Esden-Tempski <piotr@esden.net>
## Copyright (C) 2013 Frantisek Burian <BuFran@seznam.cz>
##
## This library is free software: you can redistribute it and/or modify
## it under the terms of the GNU Lesser General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This library is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
## GNU Lesser General Public License for more details.
##
## You should have received a copy of the GNU Lesser General Public License
## along with this library.  If not, see <http://www.gnu.org/licenses/>.
##

# Be silent per default, but 'make V=1' will show all compiler calls.
ifneq ($(V),1)
Q		:= @
NULL		:= 2>/dev/null
endif


PREFIX		?= arm-none-eabi

CC		= $(PREFIX)-gcc
CXX		= $(PREFIX)-g++
LD		= $(PREFIX)-gcc
AR		= $(PREFIX)-ar
AS		= $(PREFIX)-as
OBJCOPY		= $(PREFIX)-objcopy
OBJDUMP		= $(PREFIX)-objdump
GDB		= $(PREFIX)-gdb
STFLASH		= $(shell which st-flash)

LDSCRIPT	?= $(BINARY).ld

OBJS		+= $(BINARY).o


ifeq ($(strip $(OPENCM3_DIR)),)
# user has not specified the library path, so we try to detect it

# where we search for the library
LIBPATHS := ./libopencm3 ../../../../../libopencm3

OPENCM3_DIR := $(wildcard $(LIBPATHS:=/locm3.sublime-project))
OPENCM3_DIR := $(firstword $(shell dirname $(OPENCM3_DIR)))

ifeq ($(strip $(OPENCM3_DIR)),)
$(error Cannot find libopencm3 library in the standard search paths.)
endif
endif

ifeq ($(V),1)
$(info Using $(OPENCM3_DIR) path to library)
endif

INCLUDE_DIR	= $(OPENCM3_DIR)/include
LIB_DIR		= $(OPENCM3_DIR)/lib
SCRIPT_DIR	= $(OPENCM3_DIR)/scripts



# C flags

CFLAGS		+= -Os -g -MD $(DEFS)
CFLAGS		+= -Wall -Wextra -Wimplicit-function-declaration
CFLAGS		+= -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
CFLAGS		+= -Wundef -Wshadow -fno-common
CFLAGS		+= -I$(INCLUDE_DIR)

# C++ flags

CXXFLAGS	+= -Os -g -MD $(DEFS)
CXXFLAGS	+= -Wall -Wextra -Wimplicit-function-declaration
CXXFLAGS	+= -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
CXXFLAGS	+= -Wundef -Wshadow -fno-common
CXXFLAGS	+= -I$(INCLUDE_DIR)

# Linker flags

LDFLAGS		+= --static -nostartfiles  -l$(LIBNAME)
LDFLAGS		+= -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
LDFLAGS		+= -Wl,--gc-sections
LDFLAGS		+= -L$(LIB_DIR)
LDFLAGS		+= -T$(LDSCRIPT)
LDFLAGS		+= -Wl,-Map=$(*).map
ifeq ($(V),1)
LDFLAGS		+= -Wl,--print-gc-sections
endif




.SUFFIXES: .elf .bin .hex .srec .list .map .images
.SECONDEXPANSION:
.SECONDARY:

all: images

images: $(BINARY).images
flash: $(BINARY).flash

%.images: %.bin %.hex %.srec %.list %.map
	@#printf "*** $* images generated ***\n"

%.bin: %.elf
	@#printf "  OBJCOPY $(*).bin\n"
	$(Q)$(OBJCOPY) -Obinary $(*).elf $(*).bin

%.hex: %.elf
	@#printf "  OBJCOPY $(*).hex\n"
	$(Q)$(OBJCOPY) -Oihex $(*).elf $(*).hex

%.srec: %.elf
	@#printf "  OBJCOPY $(*).srec\n"
	$(Q)$(OBJCOPY) -Osrec $(*).elf $(*).srec

%.list: %.elf
	@#printf "  OBJDUMP $(*).list\n"
	$(Q)$(OBJDUMP) -S $(*).elf > $(*).list

%.elf %.map: $(OBJS) $(LDSCRIPT) $(LIB_DIR)/lib$(LIBNAME).a
	@#printf "  LD      $(*).elf\n"
	$(Q)$(LD) -o $(*).elf $(OBJS) $(LDFLAGS) $(ARCH_FLAGS)

%.o: %.c
	@#printf "  CC      $(*).c\n"
	$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $(*).o -c $(*).c

%.o: %.cxx
	@#printf "  CXX     $(*).cxx\n"
	$(Q)$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $(*).o -c $(*).cxx

%.o: %.cpp
	@#printf "  CXX     $(*).cpp\n"
	$(Q)$(CXX) $(CXXFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) -o $(*).o -c $(*).cpp

clean:
	@#printf "  CLEAN\n"
	$(Q)rm -f *.o
	$(Q)rm -f *.d
	$(Q)rm -f *.elf
	$(Q)rm -f *.bin
	$(Q)rm -f *.hex
	$(Q)rm -f *.srec
	$(Q)rm -f *.list
	$(Q)rm -f *.map

%.stlink-flash: %.bin
	@printf "  FLASH  $<\n"
	$(Q)$(STFLASH) write $(*).bin 0x8000000

ifeq ($(STLINK_PORT),)
ifeq ($(BMP_PORT),)
ifeq ($(OOCD_SERIAL),)
%.flash: %.hex
	@printf "  FLASH   $<\n"
	@# IMPORTANT: Don't use "resume", only "reset" will work correctly!
	$(Q)$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
		    -f board/$(OOCD_BOARD).cfg \
		    -c "init" -c "reset init" \
		    -c "flash write_image erase $(*).hex" \
		    -c "reset" \
		    -c "shutdown" $(NULL)
else
%.flash: %.hex
	@printf "  FLASH   $<\n"
	@# IMPORTANT: Don't use "resume", only "reset" will work correctly!
	$(Q)$(OOCD) -f interface/$(OOCD_INTERFACE).cfg \
		    -f board/$(OOCD_BOARD).cfg \
		    -c "ft2232_serial $(OOCD_SERIAL)" \
		    -c "init" -c "reset init" \
		    -c "flash write_image erase $(*).hex" \
		    -c "reset" \
		    -c "shutdown" $(NULL)
endif
else
%.flash: %.elf
	@printf "  GDB   $(*).elf (flash)\n"
	$(Q)$(GDB) --batch \
		   -ex 'target extended-remote $(BMP_PORT)' \
		   -x $(SCRIPT_DIR)/black_magic_probe_flash.scr \
		   $(*).elf
endif
else
%.flash: %.elf
	@printf "  GDB   $(*).elf (flash)\n"
	$(Q)$(GDB) --batch \
		   -ex 'target extended-remote $(STLINK_PORT)' \
		   -x $(SCRIPT_DIR)/stlink_flash.scr \
		   $(*).elf
endif

.PHONY: images clean

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