Makefile

# Makefile for ESP8266 projects
#
# Thanks to:
# - zarya
# - Jeroen Domburg (Sprite_tm)
# - Christian Klippel (mamalala)
# - Tommie Gannert (tommie)
#
# Changelog:
# - 2014-10-06: Changed the variables to include the header file directory
# - 2014-11-23: Updated for SDK 0.9.3
# - 2014-12-25: Replaced esptool by esptool.py


BUILD_AREA = $(CURDIR)/..

# Output directors to store intermediate compiled files
# relative to the project directory
BUILD_BASE	= build
FW_BASE		= firmware

# base directory of the ESP8266 SDK package, absolute
SDK_BASE	?= /home/felixmccuaig/esp-open-sdk/sdk

# esptool.py path and port
ESPTOOL		?= esptool.py
ESPPORT		?= /dev/ttyUSB0

# name for the target project
TARGET		= app

# which modules (subdirectories) of the project to include in compiling
MODULES		= driver user
EXTRA_INCDIR    = include

# libraries used in this project, mainly provided by the SDK
LIBS		= c gcc hal pp phy net80211 lwip_open_napt wpa main

# compiler flags using during compilation of source files
CFLAGS	= -I -Os -g -O2 -Wpointer-arith -Wundef -Werror -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mtext-section-literals  -D__ets__ -DICACHE_FLASH -DLWIP_OPEN_SRC

# linker flags used to generate the main object file
LDFLAGS		= -nostdlib -Wl,--no-check-sections -u call_user_start -Wl,-static -L.

# linker script used for the above linkier step
#LD_SCRIPT	= -Teagle.app.v6.ld
LD_SCRIPT	= -Trom.ld

# various paths from the SDK used in this project
SDK_LIBDIR	= lib
SDK_LDDIR	= ld
SDK_INCDIR	= include include/json

# we create two different files for uploading into the flash
# these are the names and options to generate them
FW_FILE_1_ADDR	= 0x00000
FW_FILE_2_ADDR	= 0x10000

# select which tools to use as compiler, librarian and linker
CC		:= xtensa-lx106-elf-gcc
AR		:= xtensa-lx106-elf-ar
LD		:= xtensa-lx106-elf-gcc

####
#### no user configurable options below here
####
SRC_DIR		:= $(MODULES)
BUILD_DIR	:= $(addprefix $(BUILD_BASE)/,$(MODULES))

SDK_LIBDIR	:= $(addprefix $(SDK_BASE)/,$(SDK_LIBDIR))
SDK_INCDIR	:= $(addprefix -I$(SDK_BASE)/,$(SDK_INCDIR))

SRC		:= $(foreach sdir,$(SRC_DIR),$(wildcard $(sdir)/*.c))
OBJ		:= $(patsubst %.c,$(BUILD_BASE)/%.o,$(SRC))
LIBS		:= $(addprefix -l,$(LIBS))
APP_AR		:= $(addprefix $(BUILD_BASE)/,$(TARGET)_app.a)
TARGET_OUT	:= $(addprefix $(BUILD_BASE)/,$(TARGET).out)

#LD_SCRIPT	:= $(addprefix -T$(SDK_BASE)/$(SDK_LDDIR)/,$(LD_SCRIPT))

INCDIR	:= $(addprefix -I,$(SRC_DIR))
EXTRA_INCDIR	:= $(addprefix -I,$(EXTRA_INCDIR))
MODULE_INCDIR	:= $(addsuffix /include,$(INCDIR))

FW_FILE_1	:= $(addprefix $(FW_BASE)/,$(FW_FILE_1_ADDR).bin)
FW_FILE_2	:= $(addprefix $(FW_BASE)/,$(FW_FILE_2_ADDR).bin)

# FELIX DID THIS
VERBOSE 	:= $(TRUE)

V ?= $(VERBOSE)
ifeq ("$(V)","1")
Q :=
vecho := @true
else
Q := @
vecho := @echo
endif

vpath %.c $(SRC_DIR)

#COMPILE OBJECTS
define compile-objects
$1/%.o: %.c
	$(vecho) "CC $$<"
	$(Q) $(CC) $(INCDIR) $(MODULE_INCDIR) $(EXTRA_INCDIR) $(SDK_INCDIR) $(CFLAGS) -c $$< -o $$@
endef

.PHONY: all checkdirs flash clean

#FIRST -CHECK ALL DIRS EXIST, THEN COMPILE, THEN 
all: checkdirs $(TARGET_OUT) $(FW_FILE_1) $(FW_FILE_2)

#ELF TO IMAGE AND ACTUALLY CORRESPONDS TO FW_FILE_1 ECT JUST CONVERTS THE OBJ TO IMAGE AND SAVES IN FW DIR
$(FW_BASE)/%.bin: $(TARGET_OUT) | $(FW_BASE)
	$(vecho) "FW $(FW_BASE)/"
	$(Q) $(ESPTOOL) elf2image -o $(FW_BASE)/ $(TARGET_OUT)

#LINKER
$(TARGET_OUT): $(APP_AR)
	$(vecho) "LD $@"
	$(Q) $(LD) -L$(BUILD_AREA)/esp-open-lwip -L$(SDK_LIBDIR) $(LD_SCRIPT) $(LDFLAGS) -Wl,--start-group $(LIBS) $(APP_AR) -Wl,--end-group -o $@
	
#DOES LIBRARIAN
$(APP_AR): $(OBJ)
	$(vecho) "AR $@"
	$(Q) $(AR) cru $@ $^

checkdirs: $(BUILD_DIR) $(FW_BASE)

#CREATE BUILD DIR IF THERE IS NONE
$(BUILD_DIR):
	$(Q) mkdir -p $@

#CREATE FW_BASE IF THERE IS NONE
$(FW_BASE):
	$(Q) mkdir -p $@

#WRITE BOTH FW FILES TO ESP
flash: $(FW_FILE_1) $(FW_FILE_2)
	$(ESPTOOL) --baud 1152000 --port $(ESPPORT) write_flash $(FW_FILE_1_ADDR) $(FW_FILE_1) $(FW_FILE_2_ADDR) $(FW_FILE_2)

#DELETE BOTH FW_BASE AND BUILD_BASE
clean:
	$(Q) rm -rf $(FW_BASE) $(BUILD_BASE)

#IDK WHAT THIS DOES
$(foreach bdir,$(BUILD_DIR),$(eval $(call compile-objects,$(bdir))))