module wave(i_clk,o_led);
	input wire i_clk;
	output reg [7:0] o_led;
	reg direction;

	initial o_led = 8'h1;
	initial direction = 0;
	
	always @(posedge i_clk)
	begin
		if(!direction)
			o_led <= { o_led[6:0], o_led[7] };
		if(direction)
			o_led <= { o_led[0], o_led[7:1] };
		if(o_led[6])
			direction <=1;
		if(o_led[1])
			direction <=0;
	end

endmodule