move to a makefile based workflow

Sensor Watch Starter Project/make/Makefile

@@ -0,0 +1,84 @@
+##############################################################################
+BUILD = build
+BIN = watch
+
+##############################################################################
+.PHONY: all directory clean size
+
+CC = arm-none-eabi-gcc
+OBJCOPY = arm-none-eabi-objcopy
+SIZE = arm-none-eabi-size
+UF2 = python uf2conv.py
+
+ifeq ($(OS), Windows_NT)
+  MKDIR = gmkdir
+else
+  MKDIR = mkdir
+endif
+
+CFLAGS += -W -Wall --std=gnu99 -Os
+CFLAGS += -fno-diagnostics-show-caret
+CFLAGS += -fdata-sections -ffunction-sections
+CFLAGS += -funsigned-char -funsigned-bitfields
+CFLAGS += -mcpu=cortex-m0plus -mthumb
+CFLAGS += -MD -MP -MT $(BUILD)/$(*F).o -MF $(BUILD)/$(@F).d
+
+LDFLAGS += -mcpu=cortex-m0plus -mthumb
+LDFLAGS += -Wl,--gc-sections
+LDFLAGS += -Wl,--script=../linker/saml22j18.ld
+
+INCLUDES += \
+  -I../include \
+  -I..
+
+SRCS += \
+  ../main.c \
+  ../startup_saml22.c
+
+DEFINES += \
+  -D__SAML22J18A__ \
+  -DDONT_USE_CMSIS_INIT \
+  -DF_CPU=16000000
+
+CFLAGS += $(INCLUDES) $(DEFINES)
+
+OBJS = $(addprefix $(BUILD)/, $(notdir %/$(subst .c,.o, $(SRCS))))
+
+all: directory $(BUILD)/$(BIN).elf $(BUILD)/$(BIN).hex $(BUILD)/$(BIN).bin $(BUILD)/$(BIN).uf2 size
+
+$(BUILD)/$(BIN).elf: $(OBJS)
+	@echo LD $@
+	@$(CC) $(LDFLAGS) $(OBJS) $(LIBS) -o $@
+
+$(BUILD)/$(BIN).hex: $(BUILD)/$(BIN).elf
+	@echo OBJCOPY $@
+	@$(OBJCOPY) -O ihex $^ $@
+
+$(BUILD)/$(BIN).bin: $(BUILD)/$(BIN).elf
+	@echo OBJCOPY $@
+	@$(OBJCOPY) -O binary $^ $@
+
+$(BUILD)/$(BIN).uf2: $(BUILD)/$(BIN).bin
+	@echo UF2CONV $@
+	@$(UF2) $^ -co $@
+
+install:
+	@$(UF2) -D $(BUILD)/$(BIN).uf2
+
+%.o:
+	@echo CC $@
+	@$(CC) $(CFLAGS) $(filter %/$(subst .o,.c,$(notdir $@)), $(SRCS)) -c -o $@
+
+directory:
+	@$(MKDIR) -p $(BUILD)
+
+size: $(BUILD)/$(BIN).elf
+	@echo size:
+	@$(SIZE) -t $^
+
+clean:
+	@echo clean
+	@-rm -rf $(BUILD)
+
+-include $(wildcard $(BUILD)/*.d)
+