MAKEFLAGS += -R -r

PROJECT   := max80
SUBDIRS   := esp32 tools rv32 fpga
REVISIONS := v1 v2 bypass

GIT_DIR   ?= .git
TEMP      ?= /tmp

MAX80_IP  ?= max80

CURL	   = curl
PERL	   = perl
PYTHON     = python
ESPTOOL   ?= esptool.py
export ESPTOOL

all clean spotless :
	$(MAKE) local.$@ $(SUBDIRS) goal=$@

prefpga:
	$(MAKE) local.all $(filter-out fpga,$(SUBDIRS)) goal=all

$(REVISIONS): prefpga
	$(MAKE) -C fpga $@

.PHONY: $(SUBDIRS)
$(SUBDIRS):
	$(MAKE) -C $@ $(goal)

.PHONY: version.mk
version.mk:
	if git log -n 1 --date=iso --pretty="format:\
PROJECT=$(PROJECT)%n\
COMMIT_VERSION=%(describe:abbrev=6)%n\
COMMIT_ID=%H%nCOMMIT_MAGIC=%h%n\
COMMIT_DATE=%ci%n\
COMMIT_TIME=%ct%n\
COMMIT_AUTHOR=%an <%ae>%n\
" > '$@.tmp' 2>/dev/null && \
	! cmp -s '$@' '$@.tmp' 2>/dev/null; then \
	mv -f '$@.tmp' '$@'; else rm -f '$@.tmp'; fi

version.%: version.mk version.%.sed
	sed -f $@.sed $< > $@

.PHONY: version
version: version.mk version.h version.vh

$(SUBDIRS): version.mk

esp32: version.h

rv32: version.h | tools

fpga: version.vh | rv32 esp32

local.all:

local.clean:
	rm -f *~ ./\#* \# *.bak *.tmp stamp_*.bin

local.spotless: local.clean
	rm -f version.h version.vh
	if [ -d .git ]; then rm -f version.mk; fi

# Obsolete target, need version
program flash:
	@echo 'Please specify one of: $(foreach rev,$(REVISIONS),$@-$(rev))' 1>&2
	@false

# FPGA-specific targets
program-% flash-%: prefpga
	$(MAKE) -C fpga $@

# ESP update by USB or serial port using esptool directly
upload-esp:
	$(MAKE) -C esp32 upload

ip = $(MAX80_IP)

ifeq ($(PORT),)
# --- Upload via HTTP ---

# Generic upload for newer firmware
upload:
	$(CURL) -v --data-binary @fpga/output/$(PROJECT).fw 'http://$(ip)/sys/fwupdate'

# Version-specific uploads for older firmware
upload-v%:
	$(CURL) -v --data-binary @fpga/output/v$*.fw 'http://$(ip)/sys/fwupdate'

# setver is not supported via HTTP
setver-v%:
	@echo 'make $@ requires PORT= to be specified'
	@exit 1

else
# --- Upload via serial port/USB

# Generic upload for newer firmware
upload:
	$(PERL) ./tools/flashmax.pl fpga/output/$(PROJECT).fw '$(PORT)' $(FLASHOPT)

# Version-specific uploads for older firmware
upload-v%:
	$(PERL) ./tools/flashmax.pl fpga/output/v$*.fw '$(PORT)' $(FLASHOPT)

# Write board ID/revision to flash
WRITEFLASH = $(ESPTOOL) --before default_reset --after hard_reset --port '$(PORT)' write_flash -z

stamp_max80_v%.bin:
	$(PERL) -e '$$m = "MAX80 v$*\0"; print $$m, "\xff" x (4096 - length ($$m));' > $@

# esptool is unreliable, so retry several times with a brief break in between
setver-v%: stamp_max80_v%.bin
	for i in `seq 1 5`; do \
		$(WRITEFLASH) 0 $< && break; \
		sleep 1; \
	done

endif