# Copyright 2021 John-Mark Gurney.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#

ARMOBJDUMP?= arm-none-eabi-objdump
ARMCC?= arm-none-eabi-gcc
ARMTARGET?= -mcpu=cortex-m3 -mthumb -DSTROBE_SINGLE_THREAD=1

# Clang doesn't work due to no-nano libc
#ARMCC?=clang-mp-9.0
#ARMTARGET?= -nostdlib -ffreestanding -target arm-none-eabi -mcpu=cortex-m3 -mfloat-abi=soft  -mthumb

PLATFORM != uname -s

.if $(PLATFORM) == "Darwin"
SOEXT=dylib
.else
.error Unsupported platform: $(PLATFORM)
.endif

PROG = lora.irr
PROGEXT = .elf

SRCS = main.c
SRCS+= board.c
SRCS+= misc.c
SRCS+= strobe_rng_init.c
.if 0
SRCS+= rng_save.c
.endif

CFLAGS+= -I$(.CURDIR)
CFLAGS+= -g
#CFLAGS+= -DNDEBUG

# Strobe
.PATH: $(.CURDIR)/strobe
CFLAGS+= -I$(.CURDIR)/strobe
SRCS+= strobe.c \
	x25519.c

# LoRamac (SX1276) radio code
LORAMAC_SRC = $(.CURDIR)/loramac/src
.PATH: $(LORAMAC_SRC)/radio/sx1276 $(LORAMAC_SRC)/system $(LORAMAC_SRC)/boards/mcu $(LORAMAC_SRC)/boards/NucleoL152
CFLAGS+= -I$(LORAMAC_SRC)/boards
CFLAGS+= -I$(LORAMAC_SRC)/system
CFLAGS+= -I$(LORAMAC_SRC)/radio
CFLAGS+= -DUSE_HAL_DRIVER -DSX1276MB1LAS
SRCS+= sx1276.c
SRCS+= utilities.c
SRCS+= adc.c timer.c delay.c gpio.c uart.c fifo.c
SRCS+= adc-board.c delay-board.c gpio-board.c rtc-board.c lpm-board.c sx1276mb1las-board.c spi-board.c uart-board.c

# Microcontroller
STM32=$(.CURDIR)/stm32
.PATH: $(STM32)/l151ccux
LINKER_SCRIPT=$(STM32)/l151ccux/STM32L151CCUX_FLASH.ld
SRCS+=				\
	startup_stm32l151ccux.s	\
	stm32l1xx_hal.c		\
	stm32l1xx_hal_adc.c	\
	stm32l1xx_hal_adc_ex.c	\
	stm32l1xx_hal_cortex.c	\
	stm32l1xx_hal_dma.c	\
	stm32l1xx_hal_flash.c \
	stm32l1xx_hal_flash_ex.c \
	stm32l1xx_hal_gpio.c	\
	stm32l1xx_hal_pcd.c	\
	stm32l1xx_hal_pcd_ex.c	\
	stm32l1xx_hal_pwr.c	\
	stm32l1xx_hal_pwr_ex.c	\
	stm32l1xx_hal_rcc.c	\
	stm32l1xx_hal_rcc_ex.c	\
	stm32l1xx_hal_rtc.c	\
	stm32l1xx_hal_rtc_ex.c	\
	stm32l1xx_hal_spi.c	\
	stm32l1xx_hal_uart.c	\
	system_stm32l1xx.c

SRCS+=				\
	stm32l1xx_it.c		\
	stm32l1xx_hal_msp.c

CFLAGS+= -I$(STM32)
CFLAGS+= -I$(STM32)/l151ccux
CFLAGS+= -DSTM32L151xC

# USB
.PATH: $(STM32)/usb
SRCS+=				\
	stm32l1xx_ll_usb.c	\
	usb_device.c		\
	usbd_cdc.c		\
	usbd_cdc_if.c		\
	usbd_conf.c		\
	usbd_core.c		\
	usbd_ctlreq.c		\
	usbd_desc.c		\
	usbd_ioreq.c

CFLAGS+= -I$(STM32)/usb

OBJS = $(SRCS:C/.c$/.o/)
CFLAGS+= -Werror -Wall

LIBLORA_TEST_SRCS= comms.c strobe.c x25519.c
LIBLORA_TEST_OBJS= $(LIBLORA_TEST_SRCS:C/.c$/.no/)

LIBLORA_TEST = liblora_test.$(SOEXT)
$(LIBLORA_TEST): $(LIBLORA_TEST_OBJS)
	$(CC) -shared -o $@ $(.ALLSRC)

.MAIN: all
.PHONY: all
all: $(PROG)$(PROGEXT) $(PROG).list

DEPENDS = .arm_deps .test_deps
.PHONY: depend
depend: $(DEPENDS)

.for i in $(DEPENDS)
.sinclude "$i"
.endfor

# Temporarily disabled as OpenOCD can't program EEPROM on the STM32L1.
# This could be used to add the data to flash.
rng_save.c: Makefile
	( echo '#include <strobe_rng_init.h>'; \
	  echo 'const rng_word_t rng_save[roundup(32, sizeof(rng_word_t)) / sizeof(rng_word_t)] __attribute__ ((section (".eeprom"))) = {'; \
	  dd if=/dev/random bs=32 count=1 | hexdump -e '4/4 " %3u," "\n"'; \
	  echo '};' \
	  ) > $@ || (rm $@ && false)

.arm_deps: $(SRCS)
	$(ARMCC) $(ARMTARGET) $(CFLAGS) $(.ALLSRC) -MM > $@ || (rm -f $@ && false)

.test_deps: $(LIBLORA_TEST_SRCS)
	$(CC) $(CFLAGS) $(.ALLSRC) -MM | sed -e 's/\.o:/\.no:/' > $@ || (rm -f $@ && false)

$(PROG)$(PROGEXT) $(PROG).map: $(OBJS)
	$(ARMCC) $(ARMTARGET) -o $(PROG)$(PROGEXT) $(.ALLSRC) -T$(LINKER_SCRIPT) --specs=nosys.specs -Wl,-Map="$(PROG).map" -Wl,--gc-sections -static --specs=nano.specs -Wl,--start-group -lc -lm -Wl,--end-group

$(PROG).list: $(PROG)$(PROGEXT)
	$(ARMOBJDUMP) -h -S $(.ALLSRC) > $@ || (rm -f $@ && false)

.PHONY: runbuild
runbuild: $(SRCS)
	for i in $(.MAKEFILE_LIST) $(.ALLSRC) $$(cat $(DEPENDS) | gsed ':x; /\\$$/ { N; s/\\\n//; tx }' | sed -e 's/^[^:]*://'); do if [ "$$i" != ".." ]; then echo $$i; fi; done | entr -d sh -c 'echo starting...; cd $(.CURDIR) && $(MAKE) $(.MAKEFLAGS) depend && $(MAKE) $(.MAKEFLAGS) all'

.PHONY: runtests
runtests: Makefile lora_comms.py lora.py $(LIBLORA_TEST) $(LIBLORA_TEST_SRCS)
	ls $(.ALLSRC) | entr sh -c '(cd $(.CURDIR) && $(MAKE) $(.MAKEFLAGS) $(LIBLORA_TEST)) && ((PYTHONPATH="$(.CURDIR)" python -m coverage run -m unittest lora && coverage report --omit=p/\* -m -i) 2>&1 | head -n 30)'

# native objects
.SUFFIXES: .no
.c.no:
	$(CC) $(CFLAGS) -c $< -o $@

.c.o:
	$(ARMCC) $(ARMTARGET) $(CFLAGS) -c $< -o $@

STROBE_NAME = strobe
STROBE_REPO = https://git.code.sf.net/p/strobe/code
STROBE_BRANCH = master

LORAMAC_NAME = loramac
LORAMAC_REPO = https://github.com/Lora-net/LoRaMac-node.git
LORAMAC_BRANCH = master

.for module in STROBE LORAMAC
.PHONY: init-$($(module)_NAME)
init-$($(module)_NAME):
	git subtree add -P $($(module)_NAME) --squash $($(module)_REPO) $($(module)_BRANCH)

.PHONY: update-$($(module)_NAME)
update-$($(module)_NAME):
	git subtree pull -P $($(module)_NAME) --squash $($(module)_REPO) $($(module)_BRANCH)
.endfor