# Toolchain configuration
CROSS_COMPILE := arm-none-eabi-
TARGET ?= application

BUILD_DIR ?= build
BIN_DIR := $(BUILD_DIR)/bin

# SDK stuff
SDK_ROOT := lib/amb1_sdk
SOC_PATH := $(SDK_ROOT)/soc/realtek/8711b
TOOLS_DIR := $(SOC_PATH)/misc/iar_utility/common/tools

CC := $(CROSS_COMPILE)gcc
AR := $(CROSS_COMPILE)ar
AS := $(CROSS_COMPILE)as
NM := $(CROSS_COMPILE)nm
LD := $(CROSS_COMPILE)gcc
OBJCOPY := $(CROSS_COMPILE)objcopy
OBJDUMP := $(CROSS_COMPILE)objdump

# OTA config
OTA_IDX ?= 1
LINKER_SCRIPT := rlx8711B-symbol-v02-img2_xip$(OTA_IDX).ld
IMAGE2_OTA := image2_all_ota$(OTA_IDX).bin

# Build info
BUILD_INFO ?= include/build_info.h

# inc and src
include $(MKFILES)/includes.mk
include $(MKFILES)/sources.mk

# compiler flags
COMMON_FLAGS := \
    -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16 \
    -Os -g2 -w

CFLAGS := $(COMMON_FLAGS) \
    -DM4 -DCONFIG_PLATFORM_8711B \
    -ffunction-sections -fdata-sections -fomit-frame-pointer \
    -fno-common -fno-short-enums -std=gnu99 -fsigned-char \
    -Wno-pointer-sign -Wno-implicit-function-declaration \
    -Wno-incompatible-pointer-types -Wno-int-conversion

LFLAGS := $(COMMON_FLAGS) \
    --specs=nano.specs -nostartfiles \
    -Wl,--gc-sections -Wl,--entry=Reset_Handler \
    -Wl,--no-enum-size-warning -Wl,--no-wchar-size-warning \
    -Wl,--wrap=malloc -Wl,--wrap=free -Wl,--wrap=realloc \
    -Wl,--wrap=rom_psk_CalcGTK -Wl,--wrap=rom_psk_CalcPTK \
    -Wl,--wrap=CalcMIC -Wl,--wrap=CheckMIC \
    -Wl,--wrap=aes_80211_encrypt -Wl,--wrap=aes_80211_decrypt \
    -Wl,--wrap=DecGTK

# libs
LIB_DIR := $(SOC_PATH)/misc/bsp/lib/common/GCC
LIBS := $(addprefix -l_,platform wlan eap http wps p2p rtlstd) \
        $(addprefix -l,m c nosys gcc)
LIBFLAGS := -L$(LIB_DIR) $(LIBS)

# obj files - handle both RAM and DRAM
OBJS := $(patsubst %.c,$(BUILD_DIR)/%.o,$(SRC_C) $(DRAM_C))
DEPS := $(OBJS:.o=.d)

.PHONY: all build_info clean post_process directory_structure

all: $(BIN_DIR)/$(TARGET).axf

$(BIN_DIR)/$(TARGET).axf: $(OBJS) $(BOOTLOADER) | $(BIN_DIR)
	$(LD) $(LFLAGS) -o $@ $(OBJS) $(BOOTLOADER) $(LIBFLAGS) -T./$(LINKER_SCRIPT)
	$(OBJDUMP) -d $@ > $(BIN_DIR)/$(TARGET).asm
	$(NM) $@ | sort > $(BIN_DIR)/$(TARGET).nmap
	$(MAKE) -f $(firstword $(MAKEFILE_LIST)) post_process

$(BUILD_DIR)/%.o: %.c $(BUILD_INFO) | directory_structure
	@mkdir -p $(dir $@)
	$(CC) $(CFLAGS) $(INCLUDES) -MMD -MP -c $< -o $@
	$(if $(findstring $(DRAM_C),$<),$(OBJCOPY) --prefix-alloc-sections .sdram $@)

# bootloader
$(BOOTLOADER): | directory_structure
	@mkdir -p $(dir $@)
	cp $(SOC_PATH)/misc/bsp/image/boot_all.bin $(BUILD_DIR)/boot/boot_all.bin
	chmod 777 $(BUILD_DIR)/boot/boot_all.bin
	$(OBJCOPY) -I binary -O elf32-littlearm -B arm \
		$(BUILD_DIR)/boot/boot_all.bin $@

.PHONY: FORCE

# ota magic
post_process: $(BIN_DIR)/$(TARGET).axf
	@echo "=== Processing OTA Image ==="
	@scripts/process_ota.sh \
		--axf $(BIN_DIR)/$(TARGET).axf \
		--bin-dir $(BIN_DIR) \
		--objcopy $(OBJCOPY) \
		--ota-idx $(OTA_IDX) \
		--tools-dir $(TOOLS_DIR)

directory_structure:
	@mkdir -p $(BIN_DIR) $(dir $(OBJS))

build_info:
	@echo "Generating build information..."
	@scripts/generate_build_info.sh $(CC) "$(CFLAGS)" > $(BUILD_INFO)

clean:
	rm -rf $(BUILD_DIR)

-include $(DEPS)