SIM_TARGET = build/blinky
BIN_TARGET = build/blinky.bin
PCF = iceFUN.pcf
YOSYS = yosys
PNR = nextpnr-ice40
IPACK = icepack
BURN = iceFUNprog

VERILATOR=verilator
VERILATOR_ROOT ?= $(shell bash -c 'verilator -V|grep VERILATOR_ROOT | head -1 | sed -e "s/^.*=\s*//"')
VINC := $(VERILATOR_ROOT)/include

.PHONY: all burn
all: $(SIM_TARGET)  $(BIN_TARGET)

# -GWIDTH=5 allows passing parameter to verilog module
obj_dir/Vblinky.cpp: blinky.v
	@echo "Running verilator"
	@$(VERILATOR) --trace -Wall -GWIDTH=15 -cc blinky.v --timescale-override 10ns/1ns

obj_dir/Vblinky__ALL.a: obj_dir/Vblinky.cpp
	@make --no-print-directory -C obj_dir -f Vblinky.mk

# std=c++11 flag is needed from verilator v4.100
$(SIM_TARGET): blinky.cpp obj_dir/Vblinky__ALL.a
	@echo "Compiling simulation executable"
	@mkdir -p build
	@g++ -I$(VINC) -I obj_dir -std=c++11 $(VINC)/verilated.cpp $(VINC)/verilated_vcd_c.cpp \
		$^ -o $@
	@echo "Run simulation with ./$(SIM_TARGET)"

$(BIN_TARGET): blinky.v $(PCF)
	@echo "Building binary stream"
	@$(YOSYS) -p "synth_ice40 -top blinky -json build/blinky.json" -q $<
	@$(PNR) -r --hx8k --json build/blinky.json --package cb132 \
		--asc build/blinky.asc --opt-timing --pcf $(PCF)\
		--pre-pack clock_constraints.py -l build/pnr_report.txt -q 
	@$(IPACK) build/blinky.asc build/blinky.bin

burn: $(BIN_TARGET)
	@$(BURN) $<

.PHONY: clean
clean:
	rm -rf obj_dir/ build/