makefile: Add ability to flash binary to microcontroller

Makefile

@@ -33,6 +33,9 @@ OBJ_FILES := $(patsubst $(BUILD_DIR)/%.S,$(BUILD_DIR)/%.o,$(ASM_FILES))
 .PHONY: build
 build: builddir preprocess compile assemble $(BUILD_DIR)/$(TARGET).elf
 
+$(BUILD_DIR)/$(TARGET).bin: $(BUILD_DIR)/$(TARGET).elf
+	arm-none-eabi-objcopy -O binary $< $@
+
 $(BUILD_DIR)/$(TARGET).elf: $(OBJ_FILES)
 	$(CC) $(LDFLAGS) $^ -o $@
 
@@ -58,6 +61,10 @@ compile: preprocess $(ASM_FILES)
 .PHONY: assemble
 assemble: compile $(OBJ_FILES)
 
+.PHONY: flash
+flash: $(BUILD_DIR)/$(TARGET).bin
+	st-flash --reset write $< 0x8000000
+
 .PHONY: clean
 clean:
 	rm -rf $(BUILD_DIR)