MAKEFLAGS += --no-builtin-rules
MAKEFLAGS += --no-builtin-variables
.SUFFIXES:

## Variables
PROGRAM ?= led
CST ?= tangnano9k.cst
FLASH_OPTS ?=
# https://github.com/YosysHQ/apicula/wiki/Nextpnr%E2%80%90Himbaechel-Gowin
# but
# https://github.com/YosysHQ/apicula/wiki/gowin_pack says something different. huh?
DEVICE_NAME ?= GW1NR-LV9QN88PC6/I5
DEVICE_FAMILY ?= GW1N-9C

# Can't use this for deps:
# -E $(PROGRAM).deps
# as yosys needs to have -o specified for this to work
# but I specify the command manually
# also, yosys inserts /tmp/ files which makes this useless.
YOSYS_OPTS = -Q -q -l $*.yosys.log -e "conflict|is used but has no driver"
NEXTPNR_OPTS = -q -l $*.pnr.log \
	--sdc clock.sdc \
	--placed-svg $*.plc.svg \
	--routed-svg $*.rt.svg
DEPS := $(wildcard *.dep)

# this is "bad", as it runs the deps target every time
# probably because of the include below
# SOURCES := $(wildcard *.v)
# DEPS := $(SOURCES:.v=.dep)


## default target
all: $(PROGRAM).fs

## dependencies

tangnano9k.cst:
	wget https://github.com/YosysHQ/apicula/raw/refs/heads/master/examples/tangnano9k.cst || \
	curl -LO https://github.com/YosysHQ/apicula/raw/refs/heads/master/examples/tangnano9k.cst

## helper targets
.PHONY: clean flash show
show: $(PROGRAM).v
	yosys -p "read_verilog $<; prep; show $(PROGRAM)"

flash: $(PROGRAM).fs
	openFPGALoader -b tangnano9k  $(FLASH_OPTS) $(PROGRAM).fs

clean:
	rm -rf *.json *.fs *.svg *.log *.dep *.vvp *.lxt2

simu: $(PROGRAM).lxt2
	gtkwave $<

## Patterns

# synthesize
%.json: %.v
#	sh resolvedeps.sh $<
# only used for dep-generation, output file is needed for dep file, but otherwise useless
# this must happen *without* synth_gowin, as this includes additional files, which ruin the depfile.
	yosys $< -E $*.dep  -o $@ && rm -f $@
	yosys -p "read_verilog $<; synth_gowin -top $* -json $@" $(YOSYS_OPTS) 

# because yosys -E is buggy, or behaves differently than expected,
# use gawk to force-create deps.
%.dep: %.v
#	sh resolvedeps.sh $<
	yosys $< -E $*.dep  -o $*.json && rm -f $*.json

# place and route?
%.pnr.json: %.json $(CST)
	nextpnr-himbaechel --json $< --write $@ \
	--device $(DEVICE_NAME) --vopt family=$(DEVICE_FAMILY) \
	--vopt cst=$(CST) \
	|| \
	nextpnr-gowin --json $< --write $@ \
	--device $(DEVICE_NAME) --family $(DEVICE_FAMILY) \
	--cst $(CST)

# pack bitstream
%.fs: %.pnr.json
	gowin_pack -d $(DEVICE_FAMILY) -o $@ $<

### simulation

%.lxt2: %.vvp
	./$< -lxt2

%.vvp: %.v %.tb.v
	iverilog -o $*.vvp $*.v $*.tb.v

## inter-file dependencies
-include $(DEPS)
-include $($(wildcard *.fs:.fs=.dep)