# directory of armen files
ifndef ARMEN_DIR
   $(eval ARMEN_DIR = $(shell dirname $(realpath $(lastword $(MAKEFILE_LIST)))))
endif

# arduino uno by default
ifndef T_CPU
    MODEL = arduino
    T_CPU = atmega328p
    F_CPU = 16000000UL
endif

# cpu target
ifeq ($(T_CPU), $(filter $(T_CPU), atiny84 attiny841 atiny85 attiny1634 atmega328p atmega2560))
    TARGET = avr
else
    $(error Unknown cpu target '$(T_CPU)')
endif

# directory for compilation
ifndef BUILD_DIR
    BUILD_DIR = $(ARMEN_DIR)/build/armen/$(T_CPU)
    $(warning BUILD_DIR not defined, set to $(BUILD_DIR))
endif

# tools for target
include $(ARMEN_DIR)/$(TARGET)/tools.mak

# arduino boards
ifeq ($(MODEL), arduino)
    ARMEN_FLAGS += -DARDUINO
    CFLAGS += -Wl,-u,vfprintf -lprintf_min
    ifdef UART
        $(eval UART = $(shell expr $(UART) + 1))
    else
        UART = 1
    endif
endif

# armen core files
ARMEN_OBJS = $(BUILD_DIR)/mdep.o $(BUILD_DIR)/armen.o
ARMEN_CORE_S = $(ARMEN_DIR)/mdep.S $(ARMEN_DIR)/$(TARGET)/core.S
ARMEN_CORE_C = $(ARMEN_DIR)/armen.c $(ARMEN_DIR)/core.c\
 $(ARMEN_DIR)/thread.c $(ARMEN_DIR)/gpio.c $(ARMEN_DIR)/$(TARGET)/gpio.c

# option: all thread functions
ifdef FULL_THREAD
    ifneq ($(FULL_THREAD), 0)
        ARMEN_FLAGS += -DUSE_FULL_THREAD
    endif
endif

# option: max count of thread(s)
ifdef THREAD
    ifneq ($(THREAD), 0)
        ARMEN_FLAGS += -DTHREAD=$(THREAD)
    endif
endif

# option: size of timer(s)
ifdef BIG_TIMER
    ifneq ($(BIG_TIMER), 0)
        ARMEN_FLAGS += -DUSE_BIG_TIMER
    endif
endif

# option: count of timer(s)
ifdef TIMER
    ifeq ($(TIMER), 2)
        ARMEN_FLAGS += -DTIMER=$(TIMER)
    endif
endif

# option: use semaphore
ifdef SEM
    ifneq ($(SEM), 0)
        ARMEN_FLAGS += -DUSE_SEM
        ARMEN_CORE_C += $(ARMEN_DIR)/sem.c
    endif
endif

# option: count of uart(s)
ifdef UART
    ifneq ($(UART), 0)
        ARMEN_FLAGS += -DUART=$(UART)
        ARMEN_CORE_C += $(ARMEN_DIR)/uart.c $(ARMEN_DIR)/$(TARGET)/uart.c\
            $(ARMEN_DIR)/$(TARGET)/usart.c $(ARMEN_DIR)/$(TARGET)/usi.c
    endif
endif

# option: use analog conversion
ifdef ADC
    ifneq ($(ADC), 0)
        ARMEN_FLAGS += -DUSE_ADC
        ARMEN_CORE_C += $(ARMEN_DIR)/$(TARGET)/adc.c
    endif
endif

# option: use pulse with modulation
ifdef PWM
    ifneq ($(PWM), 0)
        ARMEN_FLAGS += -DUSE_PWM
        ARMEN_CORE_C += $(ARMEN_DIR)/$(TARGET)/pwm.c
    endif
endif

# option: use [pin change] interruption(s)
ifdef PCINT
    ifneq ($(PCINT), 0)
        ARMEN_FLAGS += -DUSE_PCINT
        ARMEN_CORE_C += $(ARMEN_DIR)/$(TARGET)/pcint.c
        ifeq ($(PCINT), 2)
            ARMEN_FLAGS += -DPCINT_PER_PORT
        endif
    endif
endif

# build armen core
$(BUILD_DIR)/mdep.o: $(ARMEN_CORE_S)
	@if [ ! -d $(BUILD_DIR) ]; then mkdir -p $(BUILD_DIR); fi
	$(CC) $(ASFLAGS) $(ARMEN_FLAGS) -I$(ARMEN_DIR) -c -o $@ $<

$(BUILD_DIR)/armen.o: $(ARMEN_CORE_C) $(ARMEN_DIR)/armen.h $(ARMEN_DIR)/core.h
	@if [ ! -d $(BUILD_DIR) ]; then mkdir -p $(BUILD_DIR); fi
	$(CC) -Wno-int-conversion $(CFLAGS) $(ARMEN_FLAGS) -I$(ARMEN_DIR) -c -o $@ $<