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OPENCM3_DIR ?= libopencm3
CMSIS_DIR ?= cmsis
MSPDEBUG_DIR ?= mspdebug
LIBSODIUM_DIR ?= libsodium
TINYAES_DIR ?= tinyaes
MUSL_DIR ?= musl
C_SOURCES := src/main.c src/mspdebug_wrapper.c src/spi_flash.c
C_SOURCES += $(MSPDEBUG_DIR)/drivers/jtaglib.c
C_SOURCES += $(CMSIS_DIR)/CMSIS/DSP/Source/TransformFunctions/arm_rfft_f32.c
C_SOURCES += $(CMSIS_DIR)/CMSIS/DSP/Source/TransformFunctions/arm_bitreversal.c
C_SOURCES += $(CMSIS_DIR)/CMSIS/DSP/Source/TransformFunctions/arm_cfft_radix4_f32.c
CXX_SOURCES += src/ldpc_wrapper.cpp
BUILDDIR ?= build
BINARY := safetyreset
LDSCRIPT := stm32f407.ld
OPENCM3_LIB := opencm3_stm32f4
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
OPENCM3_DIR := $(abspath $(OPENCM3_DIR))
CMSIS_DIR := $(abspath $(CMSIS_DIR))
MSPDEBUG_DIR := $(abspath $(MSPDEBUG_DIR))
LIBSODIUM_DIR := $(abspath $(LIBSODIUM_DIR))
TINYAES_DIR := $(abspath $(TINYAES_DIR))
MUSL_DIR := $(abspath $(MUSL_DIR))
CFLAGS += -I$(OPENCM3_DIR)/include -Imspdebug/util -Imspdebug/drivers
CFLAGS += -I$(CMSIS_DIR)/CMSIS/DSP/Include -I$(CMSIS_DIR)/CMSIS/Core/Include
CFLAGS += -Os -std=gnu11 -g -DSTM32F4
# Note: libopencm3 requires some standard libc definitions from stdint.h and stdbool.h, so we don't pass -nostdinc here.
CFLAGS += -nostdlib -ffreestanding
CFLAGS += -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
CFLAGS += -fno-common -ffunction-sections -fdata-sections
INT_CFLAGS += -Wextra -Wshadow -Wimplicit-function-declaration -Wundef
INT_CFLAGS += -Wredundant-decls -Wmissing-prototypes -Wstrict-prototypes
CXXFLAGS += -Os -g
CXXFLAGS += -nostdlib -ffreestanding
CXXFLAGS += -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16
CXXFLAGS += -fno-common -ffunction-sections -fdata-sections
CXXFLAGS += -Wextra -Wshadow -Wundef -Wredundant-decls
CXXFLAGS += -I.
LDFLAGS += --static -nostartfiles
LDFLAGS += -T$(LDSCRIPT)
LDFLAGS += -mthumb -mcpu=cortex-m4 -mfloat-abi=hard -mfpu=fpv4-sp-d16 -g
LDFLAGS += -Wl,--cre
#LDFLAGS += -Wl,--gc-sections
LDFLAGS += -Wl,--start-group -lc -lgcc -lnosys -Wl,--end-group
LDFLAGS += -L$(OPENCM3_DIR)/lib -l$(OPENCM3_LIB) $(shell $(CC) -print-libgcc-file-name)
all: $(BUILDDIR)/$(BINARY).elf
OBJS := $(addprefix $(BUILDDIR)/,$(C_SOURCES:.c=.o) $(CXX_SOURCES:.cpp=.o))
$(BUILDDIR)/%.elf: $(OBJS) $(LDSCRIPT) $(OPENCM3_DIR)/lib/lib$(OPENCM3_LIB).a $(BUILDDIR)/libsodium/src/libsodium/.libs/libsodium.a $(BUILDDIR)/tinyaes/aes.o $(BUILDDIR)/musl/lib/libc.a
$(LD) $(OBJS) $(LDFLAGS) -o $@ -Wl,-Map=$(BUILDDIR)/src/$*.map $(BUILDDIR)/libsodium/src/libsodium/.libs/libsodium.a $(BUILDDIR)/tinyaes/aes.o
$(BUILDDIR)/src/%.o: src/%.c
mkdir -p $(@D)
$(CC) $(CFLAGS) $(INT_CFLAGS) -o $@ -c $<
$(BUILDDIR)/src/%.o: src/%.cpp
mkdir -p $(@D)
$(CXX) $(CXXFLAGS) -o $@ -c $<
$(BUILDDIR)/%.o: %.c
mkdir -p $(@D)
$(CC) $(CFLAGS) $(EXT_CFLAGS) -o $@ -c $<
$(OPENCM3_DIR)/lib/lib$(OPENCM3_LIB).a:
$(MAKE) -C $(OPENCM3_DIR) -j $(shell nproc)
$(BUILDDIR)/libsodium/src/libsodium/.libs/libsodium.a:
mkdir -p build/libsodium
cd build/libsodium && CFLAGS="$(CFLAGS) -DDEV_MODE=1" $(LIBSODIUM_DIR)/configure --host=arm-none-eabi && $(MAKE) -j $(shell nproc)
$(BUILDDIR)/tinyaes/aes.o:
mkdir -p $(@D)
make -C $(@D) -f $(TINYAES_DIR)/Makefile VPATH=$(TINYAES_DIR) CFLAGS="$(CFLAGS) -c" CC=$(CC) LD=$(LD) AR=$(AR) aes.o
clean:
-rm -r $(BUILDDIR)/src
-rm $(BUILDDIR)/$(BINARY).elf
mrproper: clean
-rm -r build
-$(MAKE) -C $(OPENCM3_DIR) clean
.PHONY: clean mrproper
-include $(OBJS:.o=.d)
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