BOARD ?= ADAFRUIT_ITSYBITSY_M4_EXPRESS
BOARD_DIR ?= boards/$(BOARD)
BUILD ?= build-$(BOARD)

CROSS_COMPILE ?= arm-none-eabi-
UF2CONV ?= $(TOP)/tools/uf2conv.py

ifeq ($(wildcard $(BOARD_DIR)/.),)
$(error Invalid BOARD specified: $(BOARD_DIR))
endif

MCU_SERIES_LOWER = $(shell echo $(MCU_SERIES) | tr '[:upper:]' '[:lower:]')

include ../../py/mkenv.mk
include $(BOARD_DIR)/mpconfigboard.mk
include mcu/$(MCU_SERIES_LOWER)/mpconfigmcu.mk

# Qstr definitions (must come before including py.mk)
QSTR_DEFS = qstrdefsport.h
QSTR_GLOBAL_DEPENDENCIES = $(BOARD_DIR)/mpconfigboard.h mcu/$(MCU_SERIES_LOWER)/mpconfigmcu.h

FROZEN_MANIFEST ?= boards/manifest.py

# Include py core make definitions
include $(TOP)/py/py.mk
include $(TOP)/extmod/extmod.mk

GIT_SUBMODULES += lib/asf4 lib/tinyusb

INC += -I.
INC += -I$(TOP)
INC += -I$(BUILD)
INC += -I$(BOARD_DIR)
INC += -Imcu/$(MCU_SERIES_LOWER)
INC += -I$(TOP)/lib/cmsis/inc
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hal/include
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hal/utils/include
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/config
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hri
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hpl/core
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hpl/gclk
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hpl/pm
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hpl/port
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hpl/rtc
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/hpl/tc
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/include
INC += -I$(TOP)/lib/asf4/$(MCU_SERIES_LOWER)/include/pio
INC += -I$(TOP)/lib/tinyusb/src

MAKE_PIN_AF = boards/make-pin-table.py
PIN_AF_TABLE_CSV = mcu/$(MCU_SERIES_LOWER)/pin-af-table.csv
BOARD_PINS = $(BOARD_DIR)/pins.csv
GEN_PIN_AF = pin_af_table.c

CFLAGS_MCU_SAMD21 = -mtune=cortex-m0plus -mcpu=cortex-m0plus -msoft-float
CFLAGS_MCU_SAMD51 = -mtune=cortex-m4 -mcpu=cortex-m4 -mfpu=fpv4-sp-d16 -mfloat-abi=hard
CFLAGS += $(INC) -Wall -Werror -std=c99 -nostdlib -mthumb $(CFLAGS_MCU_$(MCU_SERIES)) -fsingle-precision-constant -Wdouble-promotion
CFLAGS += -DMCU_$(MCU_SERIES) -D__$(CMSIS_MCU)__
CFLAGS += $(CFLAGS_EXTRA)

LDFLAGS += -nostdlib $(addprefix -T,$(LD_FILES)) -Map=$@.map --cref

LIBS += $(shell $(CC) $(CFLAGS) -print-libgcc-file-name)

# Tune for Debugging or Optimization
CFLAGS += -g  # always include debug info in the ELF
ifeq ($(DEBUG),1)
CFLAGS += -O0
else
CFLAGS += -Os -DNDEBUG
LDFLAGS += --gc-sections
CFLAGS += -fdata-sections -ffunction-sections
endif

# Flags for optional C++ source code
CXXFLAGS += $(filter-out -std=c99,$(CFLAGS))

# TODO make this common -- shouldn't be using these "private" vars from py.mk
ifneq ($(SRC_CXX)$(SRC_USERMOD_CXX)$(SRC_USERMOD_LIB_CXX),)
LIBSTDCPP_FILE_NAME = "$(shell $(CXX) $(CXXFLAGS) -print-file-name=libstdc++.a)"
LDFLAGS += -L"$(shell dirname $(LIBSTDCPP_FILE_NAME))"
endif

SRC_C += \
	mcu/$(MCU_SERIES_LOWER)/clock_config.c \
	help.c \
	machine_adc.c \
	machine_bitstream.c \
	machine_dac.c \
	machine_i2c.c \
	machine_pin.c \
	machine_rtc.c \
	machine_spi.c \
	machine_timer.c \
	machine_uart.c \
	machine_wdt.c \
	main.c \
	modutime.c \
	modmachine.c \
	modsamd.c \
	mphalport.c \
	pendsv.c \
	pin_af.c \
	samd_flash.c \
	samd_isr.c \
	samd_soc.c \
	tusb_port.c \

SHARED_SRC_C += \
	shared/runtime/mpirq.c \
	shared/libc/printf.c \
	shared/libc/string0.c \
	shared/readline/readline.c \
	shared/runtime/gchelper_native.c \
	shared/runtime/interrupt_char.c \
	shared/runtime/pyexec.c \
	shared/runtime/softtimer.c \
	shared/runtime/stdout_helpers.c \
	shared/runtime/sys_stdio_mphal.c \
	shared/timeutils/timeutils.c \

ASF4_SRC_C += $(addprefix lib/asf4/$(MCU_SERIES_LOWER)/,\
	hal/src/hal_atomic.c \
	hal/src/hal_flash.c \
	hpl/nvmctrl/hpl_nvmctrl.c \
	)

LIBM_SRC_C += $(addprefix lib/libm/,\
	ef_sqrt.c \
	fmodf.c \
	math.c \
	nearbyintf.c \
	)

TINYUSB_SRC_C += $(addprefix lib/tinyusb/src/,\
	class/cdc/cdc_device.c \
	common/tusb_fifo.c \
	device/usbd.c \
	device/usbd_control.c \
	portable/microchip/samd/dcd_samd.c \
	tusb.c \
	)

DRIVERS_SRC_C += \
	drivers/bus/softspi.c \

# List of sources for qstr extraction
SRC_QSTR += $(SRC_C) $(SHARED_SRC_C) $(SRC_CXX)

OBJ += $(PY_O)
OBJ += $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
OBJ += $(addprefix $(BUILD)/, $(SRC_CXX:.cpp=.o))
OBJ += $(addprefix $(BUILD)/, $(SRC_S:.s=.o))
OBJ += $(addprefix $(BUILD)/, $(SHARED_SRC_C:.c=.o))
OBJ += $(addprefix $(BUILD)/, $(ASF4_SRC_C:.c=.o))
OBJ += $(addprefix $(BUILD)/, $(LIBM_SRC_C:.c=.o))
OBJ += $(addprefix $(BUILD)/, $(DRIVERS_SRC_C:.c=.o))
OBJ += $(addprefix $(BUILD)/, $(TINYUSB_SRC_C:.c=.o))

ifneq ($(FROZEN_MANIFEST),)
CFLAGS += -DMICROPY_MODULE_FROZEN_MPY
CFLAGS += -DMICROPY_MODULE_FROZEN_STR
CFLAGS += -DMICROPY_QSTR_EXTRA_POOL=mp_qstr_frozen_const_pool
endif

all: $(BUILD)/firmware.uf2

$(BUILD)/firmware.elf: $(OBJ)
	$(ECHO) "LINK $@"
	$(Q)$(LD) $(LDFLAGS) -o $@ $^ $(LIBS)
	$(Q)$(SIZE) $@

$(BUILD)/firmware.bin: $(BUILD)/firmware.elf
	$(Q)$(OBJCOPY) -O binary -j .isr_vector -j .text -j .data $^ $(BUILD)/firmware.bin

$(BUILD)/firmware.uf2: $(BUILD)/firmware.bin
	$(Q)$(PYTHON) $(UF2CONV) -b $(TEXT0) -c -o $@ $<

pin_af.c: $(BUILD)/$(GEN_PIN_AF) | $(HEADER_BUILD)

$(BUILD)/$(GEN_PIN_AF): $(PIN_AF_TABLE_CSV) $(BOARD_PINS) | $(HEADER_BUILD)
	$(ECHO) "Create $@"
	$(Q)$(PYTHON) $(MAKE_PIN_AF) --csv $(PIN_AF_TABLE_CSV) --board $(BOARD_PINS) --table $(BUILD)/$(GEN_PIN_AF) --mcu $(MCU_SERIES)

include $(TOP)/py/mkrules.mk