CFLAGS  = -W -Wall -Wextra -Werror -Wundef -Wshadow -Wdouble-promotion
CFLAGS += -Wformat-truncation -fno-common -Wconversion -Wno-sign-conversion
CFLAGS += -g3 -Os -ffunction-sections -fdata-sections
CFLAGS += -I. -Icmsis_core/CMSIS/Core/Include -Icmsis_tm4c/Device/TI/TM4C/Include
CFLAGS += -mcpu=cortex-m4 -mthumb -mfloat-abi=hard -mfpu=fpv4-sp-d16
LDFLAGS ?= -Tlink.ld -nostdlib -nostartfiles --specs nano.specs -lc -lgcc -Wl,--gc-sections -Wl,-Map=$@.map

SOURCES = main.c syscalls.c sysinit.c
SOURCES += startup.c # startup file. Compiler-dependent!

# TinyUSB
SOURCES += tinyusb/src/tusb.c
SOURCES += tinyusb/src/common/tusb_fifo.c
SOURCES += tinyusb/src/device/usbd.c
SOURCES += tinyusb/src/device/usbd_control.c
SOURCES += tinyusb/src/class/net/ecm_rndis_device.c
SOURCES += tinyusb/src/class/net/ncm_device.c
SOURCES += tinyusb/src/portable/mentor/musb/dcd_musb.c
SOURCES += tinyusb/lib/networking/rndis_reports.c
SOURCES += usb_descriptors.c
CFLAGS += -Itinyusb/src -Itinyusb/lib/networking
CFLAGS += -DTM4C1294NCPDT
CFLAGS += -Wno-conversion -Wno-sign-conversion

# Mongoose-specific. See https://mongoose.ws/documentation/#build-options
SOURCES += mongoose.c 
CFLAGS += -DMG_ENABLE_TCPIP=1 -DMG_ARCH=MG_ARCH_NEWLIB -DMG_ENABLE_CUSTOM_MILLIS=1
CFLAGS += -DMG_IO_SIZE=512 $(CFLAGS_EXTRA)

ifeq ($(OS),Windows_NT)
  RM = cmd /C del /Q /F /S
else
  RM = rm -rf
endif

all build example: firmware.bin

firmware.bin: firmware.elf
	arm-none-eabi-objcopy -O binary $< $@

firmware.elf: cmsis_core cmsis_tm4c tinyusb $(SOURCES) hal.h link.ld 
	arm-none-eabi-gcc $(SOURCES) $(CFLAGS) $(LDFLAGS) -o $@

flash: firmware.bin
	@echo "This requires Uniflash"

cmsis_core:     # ARM CMSIS core headers
	git clone --depth 1 -b 5.9.0 https://github.com/ARM-software/CMSIS_5 $@
cmsis_tm4c:     # CMSIS headers for TM4C series
	git clone --depth 1 --no-checkout https://github.com/speters/CMSIS $@ && cd $@ && git sparse-checkout set Device/TI/TM4C && git checkout
	cd cmsis_tm4c && git apply ../cmsis_tm4c.patch # Fix error for the device we tested
tinyusb:        # TinyUSB sources
	git clone --depth 1 -b 0.14.0 https://github.com/hathach/tinyusb $@
	cd tinyusb && git apply ../tinyusb.patch  # Enable support for TM4C129 series

clean:
	$(RM) firmware.* *.su cmsis_core cmsis_tm4c tinyusb