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])beginled <= cnt[26];end else begin led <= ~cnt[26];end 
endendmodule 

笔者的clk是50M