TOOLCHAIN_PREFIX = /opt/riscv32i/bin/riscv32-unknown-elf-

ECP5_SIM_CELLS=$(shell yosys-config --datdir/ecp5/cells_sim.v)
COPY=cp

# set to 4 for simulation
FIRMWARE_COUNTER_BITS=18

all: example.dfu

dfu: example.dfu
	dfu-util --alt 0 --download $< --reset

## -------------------
## firmware generation

firmware.elf: firmware.S firmware.c firmware.lds
	$(TOOLCHAIN_PREFIX)gcc \
		-DSHIFT_COUNTER_BITS=$(FIRMWARE_COUNTER_BITS) \
		-march=rv32i -Os -ffreestanding -nostdlib \
		-o $@ firmware.S firmware.c \
		--std=gnu99 -Wl,-Bstatic,-T,firmware.lds,-Map,firmware.map,--strip-debug
	chmod -x $@

firmware.bin: firmware.elf
	$(TOOLCHAIN_PREFIX)objcopy -O binary $< $@
	chmod -x $@

firmware.hex: firmware.bin
	python3 picorv32/firmware/makehex.py $< 128 > $@

## ------------------------------
## main flow: synth/p&r/bitstream

synth.json: example.v picorv32/picorv32.v firmware.hex
	yosys -v3 -l synth.log -p 'synth_ecp5 -top top -json $@; write_verilog -attr2comment synth.v' $(filter %.v, $^)

example_out.config: synth.json example.pcf
	nextpnr-ecp5 --json $< --textcfg $@ --um5g-85k --speed 8 --package CABGA381 --lpf example.pcf

example.bit: example_out.config
	ecppack --compress --freq 38.8 --input $< --bit $@

%.dfu : %.bit
	$(COPY) $< $@
	dfu-suffix -v 1209 -p 5af1 -a $@

## -----------------
## icarus simulation

example_tb.vvp: example.v example_tb.v picorv32/picorv32.v firmware.hex
	iverilog -o $@ -s testbench $(filter %.v, $^)
	chmod -x $@

example_sim: example_tb.vvp
	vvp -N $<

example_sim_vcd: example_tb.vvp
	vvp -N $< +vcd

## ---------------------
## post-synth simulation

synth_tb.vvp: example_tb.v synth.json
	iverilog -o $@ -s testbench synth.v example_tb.v $(ECP5_SIM_CELLS)
	chmod -x $@

synth_sim: synth_tb.vvp
	vvp -N $<

synth_sim_vcd: synth_tb.vvp
	vvp -N $< +vcd

## ---------------------
## post-route simulation

route.v: example.asc example.pcf
	icebox_vlog -L -n top -sp example.pcf $< > $@

route_tb.vvp: route.v example_tb.v
	iverilog -o $@ -s testbench $^ $(ECP5_SIM_CELLS)
	chmod -x $@

route_sim: route_tb.vvp
	vvp -N $<

route_sim_vcd: route_tb.vvp
	vvp -N $< +vcd

## ---------------------
## miscellaneous targets

prog_sram: example.bin
	iceprog -S $<

timing: example.asc example.pcf
	icetime -c 62 -tmd hx8k -P ct256 -p example.pcf -t $<

view: example.vcd
	gtkwave $< example.gtkw

## ------
## el fin

clean:
	rm -f firmware.elf firmware.map firmware.bin firmware.hex
	rm -f synth.log synth.v synth.json route.v example.asc example.bin
	rm -f example_tb.vvp synth_tb.vvp route_tb.vvp example.vcd

.PHONY: all prog_sram view clean
.PHONY: example_sim synth_sim route_sim timing
.PHONY: example_sim_vcd synth_sim_vcd route_sim_vcd