PIC_DIR = PIC

DEVICE  = GW5A-LV25MG121NES
FAMILY  = GW5A-25A
TOP     = pic_top
CST     = primer25k.cst

MODULE  = -m ghdl
STD     = --std=08

# Synthesizable sources (no testbenches, no VHDL file-I/O packages)
SYN_FILES = \
	$(PIC_DIR)/common.vhd \
	$(PIC_DIR)/decoder.vhd \
	$(PIC_DIR)/fifo.vhd \
	$(PIC_DIR)/uart.vhd \
	$(PIC_DIR)/ALU.vhd \
	$(PIC_DIR)/stack.vhd \
	$(PIC_DIR)/dpram.vhd \
	$(PIC_DIR)/state_machine.vhd \
	$(PIC_DIR)/PIC.vhd \
	$(PIC_DIR)/prog_rom.vhd \
	$(PIC_DIR)/pic_top.vhd

# Simulation adds the hex-reader package and testbenches
SIM_FILES = \
	$(PIC_DIR)/common.vhd \
	$(PIC_DIR)/decoder.vhd \
	$(PIC_DIR)/hexfile_reader.vhd \
	$(PIC_DIR)/fifo.vhd \
	$(PIC_DIR)/uart.vhd \
	$(PIC_DIR)/ALU.vhd \
	$(PIC_DIR)/stack.vhd \
	$(PIC_DIR)/dpram.vhd \
	$(PIC_DIR)/state_machine.vhd \
	$(PIC_DIR)/PIC.vhd

TB_FILES = \
	$(PIC_DIR)/tb_stack.vhd \
	$(PIC_DIR)/tb_pic.vhd

all: $(TOP).fs

# Synthesize
$(TOP).json: $(SYN_FILES)
	ghdl -a $(STD) $(SYN_FILES)
	yosys $(MODULE) -p "ghdl $(STD) $(TOP); memory_map; synth_gowin -json $@ -family gw5a"

# Place and route
$(TOP)_pnr.json: $(TOP).json $(CST)
	nextpnr-himbaechel --json $< --write $@ \
		--device $(DEVICE) --vopt family=GW5A-25A --vopt cst=$(CST) \
		--vopt sspi_as_gpio --freq 50 --report $(TOP)_timing.json

# Pack bitstream
$(TOP).fs: $(TOP)_pnr.json
	gowin_pack --sspi_as_gpio --cpu_as_gpio -d $(FAMILY) -o $@ $<

sim: $(SIM_FILES) $(TB_FILES)
	ghdl -a $(STD) $(SIM_FILES) $(TB_FILES)
	ghdl -e $(STD) tb_stack
	ghdl -r $(STD) tb_stack
	ghdl -e $(STD) tb_pic
	ghdl -r $(STD) tb_pic --vcd=tb_pic.vcd

pic_top.dot: $(SYN_FILES)
	ghdl -a $(STD) $(SYN_FILES)
	yosys $(MODULE) -p "ghdl $(STD) $(TOP); show -format dot -prefix pic_top"

uart.dot: $(PIC_DIR)/fifo.vhd $(PIC_DIR)/uart.vhd
	ghdl -a $(STD) $(PIC_DIR)/fifo.vhd $(PIC_DIR)/uart.vhd
	yosys $(MODULE) -p "ghdl $(STD) uart; show -format dot -prefix uart"

clean:
	rm -f $(TOP).json $(TOP)_pnr.json $(TOP).fs $(TOP)_timing.json
	rm -f pic_top.dot uart.dot
	rm -f *.o work-obj08.cf e~*.lst
	rm -f *.vcd
	rm -f tb_pic tb_stack

.PHONY: all sim clean