写一个呼吸灯要几行代码？

module breathe(
input clk,
output reg led
);
reg [26:0]cnt = 1'b0;
always @(posedge clk)
begin    
    cnt <= cnt + 1'b1;
    if(cnt[15:6]>cnt[25:16])begin
	   led <= cnt[26];
	end else begin 
       led <= ~cnt[26];
	end 
end
 
endmodule 

笔者的clk是50M