TARGET = rx
AVR = 1
EXTRAINCDIR = include
CSTANDARD = gnu99
CPPSTANDARD = gnu++98
BUILDDIRBASE = build

ifeq ($(AVR),1)
	MCU = attiny85
	F_CPU = 16000000
	BUILDDIR = $(BUILDDIRBASE)/avr
else
	MCU = cortex-m3
	BUILDDIR = $(BUILDDIRBASE)/arm
endif

RM = rm -rf
MKDIR = mkdir -p

ifeq ($(AVR),1)
	GCC = avr-gcc
	SIZE = avr-size
	OBJCOPY = avr-objcopy
	OBJDUMP = avr-objdump
	AVRDUDE = avrdude
else
	GCC_BIN = ~/bin/mbed/gcc-arm-none-eabi/bin
	GCC = $(GCC_BIN)/arm-none-eabi-gcc
	GPP = $(GCC_BIN)/arm-none-eabi-g++
	SIZE = $(GCC_BIN)/arm-none-eabi-size
	OBJCOPY = $(GCC_BIN)/arm-none-eabi-objcopy
	OBJDUMP = $(GCC_BIN)/arm-none-eabi-objdump
endif

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

ifeq ($(AVR),1)
	SRC += src/avr/timer.c
	SRC += src/avr/cppm.c
ifeq ($(DEBUG),1)
		SRC += src/avr/serial.c
endif
else
	CPPSRC += src/arm/cppm.cpp
	CPPSRC += src/arm/serial.cpp
	CPPSRC += src/arm/spi.cpp
	CPPSRC += src/arm/timer.cpp
endif

ifeq ($(AVR),1)
	CARGS = -I$(EXTRAINCDIR)
	CARGS += -Os
	CARGS += -std=$(CSTANDARD)
	CARGS += -Wall -Wextra -pedantic -Werror
	CARGS += -mmcu=$(MCU)
	CARGS += -funsigned-bitfields
	CARGS += -fpack-struct
	CARGS += -fshort-enums
	CARGS += -ffunction-sections
	CARGS += -Wshadow
	CARGS += -Wpointer-arith -Wcast-qual -Wstrict-prototypes
	CARGS += -Wno-main -Wno-write-strings -Wno-unused-parameter
	CARGS += -DF_CPU=$(F_CPU)
	LINKER = -Wl,--relax
	LINKER += -Wl,-Map -Wl,$(@:.elf=.map)
else
	PRE_DEFS = -DTOOLCHAIN_GCC_ARM -DTOOLCHAIN_GCC -DARM_MATH_CM3
	PRE_DEFS += -DTARGET_LIKE_CORTEX_M3 -DTARGET_CORTEX_M
	PRE_DEFS += -DMBED_BUILD_TIMESTAMP=1462534374.34
	PRE_DEFS += -DTARGET_LIKE_MBED -DTARGET_LPC176X -DTARGET_NXP
	PRE_DEFS += -DTARGET_LPC1768 -D__CORTEX_M3 -DTARGET_M3
	PRE_DEFS += -DTARGET_MBED_LPC1768 -D__MBED__=1
	CARGS = -I$(EXTRAINCDIR)
	CARGS += -Ilib
	CARGS += -Os
	CARGS += -std=$(CSTANDARD)
	CARGS += -Wall -Wextra -pedantic -Werror
	CARGS += -Wno-main
	CARGS += -mcpu=$(MCU)
	CARGS += -mthumb
	CARGS += -fno-common -fmessage-length=0
	CARGS += -fno-exceptions -ffunction-sections -fdata-sections
	CARGS += -fomit-frame-pointer
	CARGS += $(PRE_DEFS)
	CPPARGS = -I$(EXTRAINCDIR)
	CPPARGS += -Ilib/MODSERIAL
	CPPARGS += -Ilib/mbed
	CPPARGS += -Ilib/mbed/TARGET_LPC1768
	CPPARGS += -Ilib/mbed/TARGET_LPC1768/TARGET_NXP
	CPPARGS += -Ilib/mbed/TARGET_LPC1768/TARGET_NXP/TARGET_LPC176X
	CPPARGS += -Ilib/mbed/TARGET_LPC1768/TARGET_NXP/TARGET_LPC176X/TARGET_MBED_LPC1768
	CPPARGS += -Ilib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM
	CPPARGS += -Os
	CPPARGS += -std=$(CPPSTANDARD)
	CPPARGS += -Wall -Wextra -pedantic -Werror
	CPPARGS += -Wno-main
	CPPARGS += -mcpu=$(MCU)
	CPPARGS += -mthumb
	CPPARGS += -fno-common -fmessage-length=0
	CPPARGS += -fno-exceptions -ffunction-sections -fdata-sections
	CPPARGS += -fomit-frame-pointer -fno-rtti
	CPPARGS += $(PRE_DEFS)
	LINKER = -mcpu=$(MCU)
	LINKER += -mthumb
	LINKER += -Wl,--gc-sections
	LINKER += --specs=nano.specs
	LINKER += -u _printf_float -u _scanf_float
	LINKER += -Wl,--wrap,main
	#LINKER += -Wl,--cref
	LINKER += -Tlib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM/LPC1768.ld
	LINKER += -Llib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM
	LINKER += -lstdc++ -lsupc++ -lm -lc -lgcc -lnosys
	LINKER += -lmbed
	CPPSRC += lib/MODSERIAL/FLUSH.cpp
	CPPSRC += lib/MODSERIAL/GETC.cpp
	CPPSRC += lib/MODSERIAL/INIT.cpp
	CPPSRC += lib/MODSERIAL/ISR_RX.cpp
	CPPSRC += lib/MODSERIAL/ISR_TX.cpp
	CPPSRC += lib/MODSERIAL/MODSERIAL_IRQ_INFO.cpp
	CPPSRC += lib/MODSERIAL/MODSERIAL.cpp
	CPPSRC += lib/MODSERIAL/PUTC.cpp
	CPPSRC += lib/MODSERIAL/RESIZE.cpp
	OBJ = lib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM/board.o
	OBJ += lib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM/cmsis_nvic.o
	OBJ += lib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM/retarget.o
	OBJ += lib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM/startup_LPC17xx.o
	OBJ += lib/mbed/TARGET_LPC1768/TOOLCHAIN_GCC_ARM/system_LPC17xx.o
endif

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

ifeq ($(AVR),1)
	PROGRAMMER = arduino
	ISPPORT = /dev/tty.usbserial-A100OZQ1
	ISPBAUD = 57600
else

endif

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

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

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

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

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

.PHONY: debugMbed
debugMbed:
	$(MAKE) BUILDDIR=build/arm/debug TARGET=debug AVR=0 DEBUG=1 all

.PHONY: debugProgramMbed
debugProgramMbed:
	$(MAKE) BUILDDIR=build/arm/debug TARGET=debug AVR=0 DEBUG=1 copy

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

.PHONY: copy
copy: $(BUILDDIR)/$(TARGET).bin
	cp $(BUILDDIR)/$(TARGET).bin /Volumes/MBED/$(TARGET).bin
	sync

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

-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

$(BUILDDIR)/%.o: %.cpp
	@$(MKDIR) $(BUILDDIR)/$(dir $<)
	$(GPP) $(CPPARGS) -c $< -o $@
	@$(GPP) $(CPPARGS) -MM $*.cpp > $(BUILDDIR)/$*.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) --output $@
	$(SIZE) $@

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

$(BUILDDIR)/$(TARGET).bin: $(BUILDDIR)/$(TARGET).elf
	$(OBJCOPY) -O binary $< $@