微處理器 - Gowin GW2AR-LV18QN88C8/I7 (Lichee Tang Nano 20K) - VHDL - LED

參考資訊：
https://github.com/YosysHQ/apicula/tree/master/examples
https://github.com/YosysHQ/apicula/wiki/Nextpnr%E2%80%90Himbaechel-Gowin

main.vhd

library ieee;
use ieee.std_logic_1164.all;
     
entity main is
    port(
        clk : in std_logic;
        led : out std_logic
    );
end main;
     
architecture logic of main is
    signal val: std_logic := '0';
    signal clk_cnt : integer := 0;
     
begin
    process(clk) is
    begin
        if (clk'event and clk = '1') then
            clk_cnt <= clk_cnt + 1;
   
            if (clk_cnt = 12000000) then
                clk_cnt <= 0;
                led <= val;
                val <= not val;
            end if;
        end if;
    end process;
end logic;

main.cst

IO_LOC "led" 15;
IO_LOC "clk" 4;

Makefile

all:
	yosys -mghdl -p "ghdl main.vhd -e main; synth_gowin -json main.json -top main"
	nextpnr-himbaechel --json main.json --write main.pack --device GW2AR-LV18QN88C8/I7 --vopt family=GW2A-18C --vopt cst=main.cst
	gowin_pack -d GW2AR-LV18QN88C8/I7 -o main.fs main.pack

ram:
	openFPGALoader -m -b tangnano20k main.fs

flash:
	openFPGALoader -f -b tangnano20k main.fs

clean:
	rm -f *.json *.fs *.pack

編譯、下載

$ make
$ make ram

完成