add upload target; fix indentation

common/rules.mk

@@ -1,7 +1,9 @@
-CC := arm-none-eabi-gcc
 AS := arm-none-eabi-as
+CC := arm-none-eabi-gcc
+OBJCOPY := arm-none-eabi-objcopy
 
 OUTFILE := main.out
+HEXFILE := $(subst .out,.hex,$(OUTFILE))
 
 MCUFLAGS := -mthumb -mcpu=cortex-m4 #-mfloat-abi=hard -mfpu=fpv4-sp-d16
 AFLAGS = $(MCUFLAGS) 
@@ -16,14 +18,22 @@ CFILES += $(wildcard $(COMMON_DIR)/*.c) \
 
 OFILES := $(patsubst %.c, %.o, $(patsubst %.s, %.o, $(CFILES)))
 
-.PHONY: all clean
+.PHONY: all upload clean
 
 all: $(OUTFILE)
 
+upload: $(HEXFILE)
+	@openocd -f interface/stlink.cfg -f target/stm32l4x.cfg \
+	         -c "program $(HEXFILE) verify reset exit"
+
 clean:
 	@echo "  CLEAN"
 	@rm -f $(OUTFILE) $(OFILES)
 
+$(HEXFILE): $(OUTFILE)
+	@echo "  OBJCOPY " $@
+	@$(OBJCOPY) -O ihex $< $@
+
 $(OUTFILE): $(OFILES)
 	@echo "  CC      " $@
 	@$(CC) $(CFLAGS) $(LDFLAGS) $(OFILES) -o $@