微處理器 - Lattice LCMXO2-1200HC-4SG32C - 如何透過yosys、nextpnr-machxo2編譯程式

參考資訊：
https://github.com/AndresNavarro82/vt52-fpga-ax2
https://github.com/danderson/ulxs/blob/main/lpf.md
https://yosyshq.readthedocs.io/projects/yosys/en/latest/cmd/synth_lattice.html

main.v

module main (
    input clk,
    output reg led
);
   
reg [23:0] clk_cnt;
   
always @(posedge clk) begin
    if (clk_cnt == 24'd10000000)
        clk_cnt <= 24'd0;
    else
        clk_cnt <= clk_cnt + 1;
  
    if (clk_cnt == 24'd10000000)
        led <= ~led;
end
   
endmodule

main.lpf

LOCATE COMP "led" SITE "27";
LOCATE COMP "clk" SITE "28";

Makefile

all:
	yosys -p "synth_lattice -family xo2 -json main.json" main.v
	nextpnr-machxo2 --device LCMXO2-1200HC-4SG32C --lpf main.lpf --json main.json --textcfg main.txt
	ecppack --compress main.txt main.bit --jed main.jed

clean:
	rm -rf main.txt main.bit main.json