common.mk

CC := arm-none-eabi-gcc
AS := arm-none-eabi-as
LD := arm-none-eabi-gcc
OBJCOPY := arm-none-eabi-objcopy

CFLAGS := -std=gnu99 -Os -mthumb -mcpu=cortex-a9 -fno-builtin-printf -fno-strict-aliasing -fno-builtin-memcpy -mno-unaligned-access -Wall -Wextra
LDFLAGS := -T common/linker.x -nodefaultlibs -nostdlib -lgcc

BUILD_DIR := build

TARGET := $(PAYLOAD_CPU)_payload

C_SRC = common/main.c device.c
ASM_SRC = common/start.S

OBJ = $(C_SRC:%.c=$(BUILD_DIR)/%.o) $(ASM_SRC:%.S=$(BUILD_DIR)/%.o)
DEP = $(OBJ:%.o=%.d)

$(BUILD_DIR)/$(TARGET).bin: $(BUILD_DIR)/$(TARGET).elf
	$(OBJCOPY) -O binary $^ $@

$(BUILD_DIR)/$(TARGET).elf: $(OBJ)
	$(LD) -o $@ $^ $(LDFLAGS)

-include $(DEP)

$(BUILD_DIR)/%.o: %.c
	mkdir -p $(@D)
	$(CC) -MMD -c -o $@ $< $(CFLAGS)

$(BUILD_DIR)/%.o: %.S
	mkdir -p $(@D)
	$(AS) -o $@ $<

clean:
	rm -rf $(BUILD_DIR)