# Megumin LED display firmware
# Copyright (C) 2018 Sebastian Götte <code@jaseg.net>
# 
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

CUBE_PATH 		?= $(wildcard ~)/resource/STM32CubeF1
CMSIS_PATH 		?= $(CUBE_PATH)/Drivers/CMSIS
CMSIS_DEV_PATH  ?= $(CMSIS_PATH)/Device/ST/STM32F1xx
HAL_PATH   		?= $(CUBE_PATH)/Drivers/STM32F1xx_HAL_Driver

CC      := arm-none-eabi-gcc
LD      := arm-none-eabi-ld
OBJCOPY := arm-none-eabi-objcopy
OBJDUMP := arm-none-eabi-objdump
SIZE    := arm-none-eabi-size

CFLAGS  = -g -Wall -Wextra -std=gnu11 -O0
CFLAGS += -mlittle-endian -mcpu=cortex-m3 -mthumb -ffreestanding
#CFLAGS += -ffunction-sections -fdata-sections
LDFLAGS = -nostdlib
#LDFLAGS += -specs=rdimon.specs -DSEMIHOSTING
LDFLAGS += -Wl,-Map=main.map
#LDFLAGS += -Wl,--gc-sections 
LIBS =
#LIBS = -lgcc
#LIBS += -lrdimon

CFLAGS += -DSTM32F103xB -DHSE_VALUE=8000000 -DLSE_VALUE=32768
CFLAGS += -DCOMPILE_TIME=$(shell date +%s) -DTARGET_DATE=$(shell date -d 'Aug 17 00:00:00 CEST 2019' +%s)

LDFLAGS += -Tstm32_flash.ld
CFLAGS += -I$(CMSIS_DEV_PATH)/Include -I$(CMSIS_PATH)/Include -I$(HAL_PATH)/Inc -Iconfig -Wno-unused -I../common
#LDFLAGS += -L$(CMSIS_PATH)/Lib/GCC -larm_cortexM3l_math

###################################################

.PHONY: program clean

all: main.elf

cmsis_exports.c: $(CMSIS_DEV_PATH)/Include/stm32f103xb.h $(CMSIS_PATH)/Include/core_cm3.h
	python3 tools/gen_cmsis_exports.py $^ > $@

%.o: %.c
	$(CC) -c $(CFLAGS) -o $@ $^
#	$(CC) -E $(CFLAGS) -o $(@:.o=.pp) $^

%.o: %.s
	$(CC) -c $(CFLAGS) -o $@ $^
#	$(CC) -E $(CFLAGS) -o $(@:.o=.pp) $^

sources.tar.xz: main.c Makefile
	tar -caf $@ $^

# don't ask...
sources.tar.xz.zip: sources.tar.xz
	zip $@ $^

sources.c: sources.tar.xz.zip
	xxd -i $< | head -n -1 | sed 's/=/__attribute__((section(".source_tarball"))) =/' > $@

main.elf: main.c startup_stm32f103xb.s system_stm32f1xx.c $(HAL_PATH)/Src/stm32f1xx_ll_utils.c base.c cmsis_exports.c
	$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ $(LIBS)
	$(OBJCOPY) -O ihex $@ $(@:.elf=.hex)
	$(OBJCOPY) -O binary $@ $(@:.elf=.bin)
	$(OBJDUMP) -St $@ >$(@:.elf=.lst)
	$(SIZE) $@
	
program: main.elf openocd.cfg
	openocd -f openocd.cfg -c "program $< verify reset exit"

clean:
	rm -f **.o
	rm -f main.elf main.hex main.bin main.map main.lst
	rm -f **.expand
	rm -f cmsis_exports.c
	rm -f sources.tar.xz
	rm -f sources.tar.xz.zip
	rm -f sources.c