improved debug output

Makefile

@@ -45,11 +45,11 @@ OBJ = $(SRC:.c=.o)
 # listing files.
 LST = $(SRC:.c=.lst)
 
-all: compile $(TARGET).lst flash
+all: compile flash
 	$(info EEPROM has to be programmed separately)
 
 debug: CFLAGS += -DDEBUG
-debug: all
+debug: map lst all
 
 # reset board by setting DTR
 # the capacitor on DTR with create a pulse on RESET
@@ -60,11 +60,11 @@ reset:
 
 # flash the device using the internal bootloader
 flash: $(TARGET).hex reset
-	$(FLASHER) -U flash:w:$(TARGET).hex:i
+	$(FLASHER) -U flash:w:$<:i
 
 # write EEPROM on the device
 eeprom: $(TARGET)_eeprom.hex reset
-	$(FLASHER) -U eeprom:w:$(TARGET)_eeprom.hex:i
+	$(FLASHER) -U eeprom:w:$<:i
 
 # write bootloader and fuses
 bootloader:
@@ -76,13 +76,22 @@ bootloader:
 compile: $(TARGET).elf
 	$(SIZE) --format=avr --mcu=$(DEVICE) $(TARGET).elf
 
+# C + ASM file
+lst: $(TARGET).lst
+
+# contains global and static variables
+map: $(TARGET).map
+
 # compile source files
 %.o: %.c %.h
 	$(CC) $(CFLAGS) -c -o $@ $<
 
 # link compiled files
 %.elf: $(OBJ)
-	$(CC) $(LDFLAGS) -o $@ $(OBJ)
+	$(CC) $(LDFLAGS) -o $@ $^
+
+$(TARGET).map: $(OBJ)
+	$(CC) $(LDFLAGS) -Wl,-Map=$@,--cref -o /dev/null $^
 
 # create extended listing for additional information
 %.lst: %.elf