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139 lines
2.9 KiB
139 lines
2.9 KiB
#############################################
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# CPU type
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MCU = atmega328p
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# CPU frequency [Hz]
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F_CPU = 16000000
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# Fuses (refer to datasheet)
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LFUSE = 0xFF
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HFUSE = 0xDE
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EFUSE = 0x05
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# AVRDUDE settings
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PROG_BAUD = 57600
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PROG_DEV = /dev/ttyUSB0
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PROG_TYPE = arduino
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# Build the final AVRDUDE arguments
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PROG_ARGS = -c $(PROG_TYPE) -p $(MCU) -b $(PROG_BAUD) -P $(PROG_DEV)
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#############################################
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# Main file
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BINARY = main
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# Obj files to be built <- add .o for any .c files you add!
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OBJS = $(BINARY).o
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OBJS += lib/usart.o
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OBJS += lib/iopins.o
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OBJS += lib/spi.o
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OBJS += lib/debounce.o
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# Dirs with header files
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INCL_DIRS = . lib/
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# Pre-defined macros
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DEFS = -DF_CPU=$(F_CPU)UL
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#############################################
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# C flags
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CFLAGS = -std=gnu99 -mmcu=$(MCU) $(DEFS) $(INCL_DIRS:%=-I%)
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CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -ffreestanding
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CFLAGS += -Wall -Wno-main -Wno-strict-prototypes -Wno-comment
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CFLAGS += -g2 -Wextra -Wfatal-errors -Wno-unused-but-set-variable
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CFLAGS += -ffunction-sections -fdata-sections -Os
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LDFLAGS = -Wl,--gc-sections -Wl,--relax -lm
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#LD_FLAGS += -Wl,-u,vfprintf -lprintf_flt -lm ## for floating-point printf
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#LD_FLAGS += -Wl,-u,vfprintf -lprintf_min ## for smaller printf
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#############################################
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## Defined programs / locations
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CC = avr-gcc
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OBJCOPY = avr-objcopy
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OBJDUMP = avr-objdump
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AVRSIZE = avr-size
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AVRDUDE = avrdude
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JUNK = *.o *.d *.elf *.bin *.hex *.srec *.list *.lst *.map *.dis *.disasm *.eep *.eeprom *.lss
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.SUFFIXES: .elf .bin .hex .lst .map .eeprom .pre
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.SECONDEXPANSION:
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.SECONDARY:
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.PHONY: all elf bin hex lst pre ee eeprom dis size clean flash flashe shell fuses show_fuses set_default_fuses
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all: hex size
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elf: $(BINARY).elf
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bin: $(BINARY).bin
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hex: $(BINARY).hex
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lst: $(BINARY).lst
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pre: $(BINARY).pre
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ee: $(BINARY).eeprom
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eeprom: $(BINARY).eeprom
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dis: lst
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# Show how big the resulting program is
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size: elf
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$(AVRSIZE) -C --mcu=$(MCU) $(BINARY).elf
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# --- Magic build targets ----------------
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%.hex: %.elf
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$(OBJCOPY) -R .eeprom -O ihex $< $@
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%.elf %.map: $(OBJS)
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$(CC) $(CFLAGS) $(LDFLAGS) $(OBJS) -o $(*).elf
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%.pre: %.c
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$(CC) $(CFLAGS) -E $(*).c --output $@
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%.eeprom: %.elf
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$(OBJCOPY) -j .eeprom --change-section-lma .eeprom=0 -O ihex $< $@
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%.lst: %.elf
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$(Q)$(OBJDUMP) -S $(*).elf > $(*).lst
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%.o: %.c
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$(CC) $(CFLAGS) -o $(*).o -c $(*).c
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%.o: %.s
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$(CC) $(CFLAGS) -o $(*).o -c $(*).s
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# Clean all produced trash
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clean:
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rm -f $(JUNK)
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cd lib && rm -f $(JUNK)
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## === avrdude ===
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flash: $(BINARY).hex
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$(AVRDUDE) $(PROG_ARGS) -U flash:w:$<
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flashe: $(BINARY).eeprom
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$(AVRDUDE) $(PROG_ARGS) -U eeprom:w:$<
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shell:
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$(AVRDUDE) $(PROG_ARGS) -nt
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# === fuses ===
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# this may not work with the arduino programmer, I haven't tried.
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FUSE_STRING = -U lfuse:w:$(LFUSE):m -U hfuse:w:$(HFUSE):m -U efuse:w:$(EFUSE):m
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fuses:
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$(AVRDUDE) $(PROG_ARGS) $(FUSE_STRING)
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show_fuses:
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$(AVRDUDE) $(PROG_ARGS) -nv
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