Makefile_ARM_explicit

## Cross-compilation commands 
CC      = arm-none-eabi-gcc
LD      = arm-none-eabi-gcc
AR      = arm-none-eabi-ar
AS      = arm-none-eabi-as
OBJCOPY = arm-none-eabi-objcopy
OBJDUMP = arm-none-eabi-objdump
SIZE    = arm-none-eabi-size

# our code
OBJS  = main.o
# startup files and anything else
OBJS += handlers.o startup.o

## Platform and optimization options
CFLAGS  = -c -fno-common -Os -g -mcpu=cortex-m4 -mthumb 
CFLAGS += -Wall -ffunction-sections -fdata-sections -fno-builtin
CFLAGS += -Wno-unused-function -ffreestanding
LFLAGS  = -Tstm32f4.ld -nostartfiles -Wl,--gc-sections

## Library headers
CFLAGS += -I./ 
CFLAGS += -I/usr/local/lib/CMSIS/Include/
CFLAGS += -I/usr/local/lib/STM32F4xx_HAL_Driver/Inc/
CFLAGS += -I/usr/local/lib/CMSIS/Device/ST/STM32F4xx/Include/

## Library objects
OBJS += /usr/local/lib/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_rcc.o
OBJS += /usr/local/lib/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_gpio.o
OBJS += /usr/local/lib/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal.o
OBJS += /usr/local/lib/STM32F4xx_HAL_Driver/Src/stm32f4xx_hal_cortex.o
OBJS += /usr/local/lib/CMSIS/Device/ST/STM32F4xx/Source/Templates/system_stm32f4xx.o

## Rules
all: size flash

main.elf: $(OBJS) stm32f4.ld
	$(LD) $(LFLAGS) -o main.elf $(OBJS)

%.bin: %.elf
	$(OBJCOPY) --strip-unneeded -O binary $< $@

## Convenience targets

flash: main.bin
	st-flash --reset write $< 0x8000000 

size: main.elf
	$(SIZE) $< 

clean:
	-rm -f $(OBJS) main.lst main.elf main.hex main.map main.bin main.list

.PHONY: all flash size clean