##

## This file is derived from 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>

## Copyright (C) 2016 Devan Lai

##

## 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

####################################################################

# Target Architecture flags

ifeq ($(ARCH),STM32F0)

LIBNAME = opencm3_stm32f0

DEFS += -DSTM32F0

FP_FLAGS ?= -msoft-float

ARCH_FLAGS = -mthumb -mcpu=cortex-m0 $(FP_FLAGS)

OOCD_BOARD ?= target/stm32f0x.cfg

endif

ifeq ($(ARCH),STM32F1)

LIBNAME = opencm3_stm32f1

DEFS += -DSTM32F1

FP_FLAGS ?= -msoft-float

ARCH_FLAGS = -mthumb -mcpu=cortex-m3 $(FP_FLAGS) -mfix-cortex-m3-ldrd

OOCD_BOARD ?= target/stm32f1x.cfg

endif

LIBNAME ?= opencm3_stm32f0

DEFS ?= -DSTM32F0

FP_FLAGS ?= -msoft-float

ARCH_FLAGS ?= -mthumb -mcpu=cortex-m0 $(FP_FLAGS)

####################################################################

# Semihosting support

SEMIHOSTING ?= 0

ifeq ($(SEMIHOSTING),1)

LDFLAGS += --specs=rdimon.specs

LDLIBS += -lrdimon

DEFS += -DSEMIHOSTING=1

else

DEFS += -DSEMIHOSTING=0

endif

####################################################################

# OpenOCD specific variables

OOCD ?= openocd

OOCD_INTERFACE ?= interface/stlink-v2.cfg

OOCD_BOARD ?= target/stm32f1x.cfg

####################################################################

# Executables

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)

####################################################################

# Source files

INCLUDE_DIR = $(OPENCM3_DIR)/include

LIB_DIR = $(OPENCM3_DIR)/lib

####################################################################

# C flags

CFLAGS += -Os -g -std=gnu11

CFLAGS += -Wextra -Wshadow -Wimplicit-function-declaration

CFLAGS += -Wredundant-decls -Wstrict-prototypes

CFLAGS += -fno-common -ffunction-sections -fdata-sections

####################################################################

# C++ flags

CXXFLAGS += -Os -g

CXXFLAGS += -Wextra -Wshadow -Wredundant-decls -Weffc++

CXXFLAGS += -fno-common -ffunction-sections -fdata-sections

####################################################################

# C & C++ preprocessor common flags

CPPFLAGS += -MD

CPPFLAGS += -Wall

CPPFLAGS += -I$(INCLUDE_DIR) $(DEFS)

####################################################################

# Linker flags

LDFLAGS += --static -nostartfiles

LDFLAGS += -L$(LIB_DIR)

LDFLAGS += -T$(LDSCRIPT)

LDFLAGS += -Wl,-Map=$(*).map

LDFLAGS += -Wl,--gc-sections

ifeq ($(V),99)

LDFLAGS += -Wl,--print-gc-sections

endif

####################################################################

# Used libraries

LDLIBS += -l$(LIBNAME)

LDLIBS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group

####################################################################

####################################################################

####################################################################

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

.SECONDEXPANSION:

.SECONDARY:

elf: $(BINARY).elf

bin: $(BINARY).bin

hex: $(BINARY).hex

srec: $(BINARY).srec

list: $(BINARY).list

images: $(BUILD)/$(BINARY).images

ocd-flash: $(BUILD)/$(BINARY).flash

$(LDSCRIPT):

ifeq (,$(wildcard $(LDSCRIPT)))

$(error Unable to find specified linker script: $(LDSCRIPT))

endif

$(OPENCM3_DIR)/Makefile:

$(Q)git submodule update --init $(OPENCM3_DIR)

$(LIB_DIR)/lib$(LIBNAME).a: $(OPENCM3_DIR)/Makefile

$(Q)$(MAKE) -C $(OPENCM3_DIR)

locm3: $(LIB_DIR)/lib$(LIBNAME).a

%.images: %.bin %.hex %.srec %.list %.map

@#printf "*** $* images generated ***\n"

%.bin: %.elf

@#printf " OBJCOPY $(*).bin\n"

#$(Q)$(OBJCOPY) -Obinary $(*).elf $(*).tmpbin

#$(Q)(cat $(*).tmpbin; cat /dev/zero) | head -c 8192 > $(*).bin

$(Q)$(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) $(LDFLAGS) $(ARCH_FLAGS) $(OBJS) $(LDLIBS) -o $(*).elf

$(BUILD)/%.o: %.c $(LIB_DIR)/lib$(LIBNAME).a

@printf " CC $(*).c\n"

$(Q)$(CC) $(CFLAGS) $(CPPFLAGS) $(ARCH_FLAGS) $(VER_FLAGS) -o $@ -c $(*).c

clean::

@#printf " CLEAN\n"

$(Q)$(RM) *.o *.d *.elf *.bin *.hex *.srec *.list *.map

%.stlink-flash: %.bin

@printf " FLASH $<\n"

$(Q)$(STFLASH) write $(*).bin 0x08000000

%.flash: %.elf

@printf " FLASH $<\n"

$(Q)$(OOCD) -f $(OOCD_INTERFACE) \

-f $(OOCD_BOARD) \

-c "program $(*).elf verify reset exit" \

$(NULL)

.PHONY: images clean elf bin hex srec list locm3

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