TARGET = rx
MCU = attiny85
F_CPU = 16000000
EXTRAINCDIR = include
CSTANDARD = c99
BUILDDIR = build

GCC = avr-gcc
SIZE = avr-size
OBJCOPY = avr-objcopy
OBJDUMP = avr-objdump
AVRDUDE = avrdude
RM = rm -rf
MKDIR = mkdir -p

SRC = src/main.c
SRC += src/timer.c
SRC += src/spi.c
SRC += src/cc2500.c
SRC += src/rx.c
SRC += src/cppm.c

ifeq ($(DEBUG),1)
	SRC += src/serial.c
endif

CARGS = -mmcu=$(MCU)
CARGS += -I$(EXTRAINCDIR)
CARGS += -Os
CARGS += -funsigned-bitfields
CARGS += -fpack-struct
CARGS += -fshort-enums
CARGS += -ffunction-sections
CARGS += -Wall -Wextra -pedantic -Werror -Wshadow
CARGS += -Wpointer-arith -Wcast-qual -Wstrict-prototypes
CARGS += -Wno-main -Wno-write-strings -Wno-unused-parameter
CARGS += -std=$(CSTANDARD)
CARGS += -DF_CPU=$(F_CPU)

ifeq ($(DEBUG),1)
	CARGS += -DDEBUG
endif

LINKER = -Wl,--relax

#PROGRAMMER = avrisp2
#ISPPORT = usb
PROGRAMMER = arduino
ISPPORT = /dev/tty.usbserial-A100OZQ1
ISPBAUD = 57600

# -----------------------------------------------------------------------------

OBJ = $(addprefix $(BUILDDIR)/, $(SRC:.c=.o))

.PHONY: all
all: $(BUILDDIR)/$(TARGET).hex

.PHONY: debug
debug:
	$(MAKE) BUILDDIR=build/debug TARGET=debug MCU=atmega328 DEBUG=1 all

.PHONY: debugProgram
debugProgram:
	$(MAKE) BUILDDIR=build/debug TARGET=debug MCU=atmega328p DEBUG=1 program

.PHONY: program
program: $(BUILDDIR)/$(TARGET).hex
	$(AVRDUDE) -p $(MCU) -c $(PROGRAMMER) -b $(ISPBAUD) -P $(ISPPORT) -e -D -U $(BUILDDIR)/$(TARGET).hex

.PHONY: clean
clean:
	$(RM) $(BUILDDIR)

-include $(OBJ:.o=.d)

$(BUILDDIR)/%.o: %.c
	@$(MKDIR) $(BUILDDIR)/$(dir $<)
	$(GCC) $(CARGS) -c $< -o $@
	@$(GCC) $(CARGS) -MM $*.c > $(BUILDDIR)/$*.d
	@mv -f $(BUILDDIR)/$*.d $(BUILDDIR)/$*.d.tmp
	@sed -e 's|.*:|$(BUILDDIR)/$*.o:|' < $(BUILDDIR)/$*.d.tmp > $(BUILDDIR)/$*.d
	@sed -e 's/.*://' < $(BUILDDIR)/$*.d.tmp | sed -e 's/\\$$//' | \
		fmt -1 | sed -e 's/^ *//' | sed -e 's/$$/:/' >> $(BUILDDIR)/$*.d
	@rm -f $(BUILDDIR)/$*.d.tmp

$(BUILDDIR)/$(TARGET).elf: $(OBJ)
	$(GCC) $(CARGS) $(OBJ) $(LINKER) -Wl,-Map -Wl,$(@:.elf=.map) --output $@
	$(SIZE) $@

$(BUILDDIR)/$(TARGET).hex: $(BUILDDIR)/$(TARGET).elf
	$(OBJCOPY) -O ihex $< $@
	$(OBJDUMP) -h -S $< > $(@:.hex=.lss)