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MAKEFLAGS += --no-builtin-rules --no-builtin-variables
# This variable can be overwritten to show executed commands
Q ?= @
# TODO use CC instead of GCC but at the moment --no-builtin-variables seems to
# break somehow detection of not defined variable.
TARGET ?= avr-
GCC ?= $(TARGET)gcc
OBJCOPY ?= $(TARGET)objcopy
AVRDUDE ?= avrdude
MCU ?= attiny85
F_CPU ?= 16000000L
CFLAGS ?= -Os -mmcu=$(MCU) -DF_CPU=$(F_CPU)
LDFLAGS ?= -Os -mmcu=$(MCU)
#####################
SRC := main.c
#####################
OBJ := $(patsubst %.c,%.o,$(SRC))
.PHONY: all
all: firmware.hex
$(OBJ): %.o: %.c
@echo "CC $@"
$(Q)$(GCC) -c $(CFLAGS) $< -o $@
firmware.elf: $(OBJ)
@echo "LD $@"
$(Q)$(GCC) $(LDFLAGS) $< -o $@
firmware.hex: firmware.elf
@echo "OBJCOPY $@"
$(Q)$(OBJCOPY) -O ihex -R .eeprom $< $@
.PHONY: install
install: firmware.hex
@echo "AVRDUDE $@"
$(Q)$(AVRDUDE) -p$(MCU) -cusbasp -D -Uflash:w:$<:a
# TODO probably configure fuses
.PHONY: clean
clean:
rm -f $(OBJ)
rm -f firmware.elf firmware.hex
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