Simple makefile for mbed OS

mbed.mk

MBED = $(firstword $(wildcard mbed mbed-os core .))
TARGET = K82F
TOOLCHAIN = GCC_ARM

#SRC ?= $(firstword $(wildcard TESTS/*/*))
BUILD ?= BUILD
BOARD ?= BOARD

VENDOR ?= MBED ARM STMicroelectronics
BAUD ?= 9600
DEV ?= /dev/$(notdir $(firstword $(foreach v,$(VENDOR), \
        $(shell udevadm trigger -v -n -s block -p ID_VENDOR=$(v)))))
TTY ?= /dev/$(notdir $(firstword $(foreach v,$(VENDOR), \
        $(shell udevadm trigger -v -n -s tty -p ID_VENDOR=$(v)))))

CFLAGS += -j0
ifdef VERBOSE
CFLAGS += -v
endif
ifdef DEBUG
#CFLAGS += -o debug-info
CFLAGS += --profile debug
endif
ifdef SMALL
#CFLAGS += --profile small
CFLAGS += --profile release
endif
CFLAGS += -DMBED_HEAP_STATS_ENABLED -DMBED_STACK_STATS_ENABLED


all build:
    mkdir -p $(BUILD)/$(TARGET)/$(TOOLCHAIN)
    echo '*' > $(BUILD)/$(TARGET)/$(TOOLCHAIN)/.mbedignore
    python $(MBED)/tools/make.py -t $(TOOLCHAIN) -m $(TARGET)   \
        $(addprefix --source=, . $(SRC))                        \
        $(addprefix --build=, $(BUILD)/$(TARGET)/$(TOOLCHAIN))  \
        $(CFLAGS)
flash:
    mkdir -p $(BOARD)
    sudo umount $(BOARD) || true
    sudo mount $(DEV) $(BOARD)
    sudo cp $(BUILD)/$(TARGET)/$(TOOLCHAIN)/*.bin $(BOARD)
    sync $(BOARD)
    sudo umount $(BOARD)
    @sleep 3

cat:
    sudo stty -F $(TTY) sane nl $(BAUD)
    sudo cat $(TTY)

reset:
    sudo python -c '__import__("serial").Serial("$(TTY)").send_break()'

screen:
    sudo screen $(TTY) $(BAUD)

debug:
    sudo killall pyocd-gdbserver || true
    @sleep 0.5
    sudo pyocd-gdbserver &
    arm-none-eabi-gdb $(BUILD)/$(TARGET)/$(TOOLCHAIN)/*.elf \
        -ex "target remote :3333"
    @sleep 0.5

size:
    arm-none-eabi-size $(BUILD)/$(TARGET)/$(TOOLCHAIN)/*.elf

ctags:
    ctags $$(find -regex '.*\.\(h\|c\|hpp\|cpp\)')

clean:
    rm -rf $(BUILD) $(BOARD)

VENDOR is defined twice

Edit: Resolved fam