bi-drectional led walker

/*`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date:    03:01:54 12/23/2019
// Design Name:
// Module Name:    led_march2
// Project Name:
// Target Devices:
// Tool versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module led_march2(
    input i_clk,
    output reg [7:0] o_led
    );
reg toggle;
initial
    begin
        o_led = 8'd1;
        toggle = 0;
    end
always @(posedge i_clk)
    begin
        o_led <= (toggle==1) ? o_led >> 1 : o_led << 1;
        if(o_led == 8'd0)
            begin
            if(toggle)
                o_led <= 8'h2;
                else
                    o_led <= 8'h40;
                toggle = ~toggle;
            end
    end

endmodule
*/


module led_march2(input i_clk,
                  output reg [7:0] o_led
                  );

reg reverse;
reg [2:0] counter;
reg [23:0] speed_control;
reg stb;
initial
    begin
     reverse = 0;
     counter = 0;
     o_led   = 1;
     speed_control = 0;
     stb = 0;
    end

always @(posedge i_clk)
  if(stb)
  begin
  if(~reverse)
     o_led <= {o_led[6:0],o_led[7]};   //walking right to left
  else
      o_led <= {o_led[0],o_led[7:1]};  //walking left to right
    end

always  @(posedge i_clk)
    counter <= counter + 1;

always @(posedge i_clk)
        {stb,speed_control} <= speed_control + 1;

always @*
begin
    reverse = 0;
   if(counter == 3'd7)
        reverse = ~reverse;
   end

endmodule