Control LEDs lights from left to right and opposite

Hi all Mr Pro,

I'm programming for Led On from left to right and right to left. But I have recently Studied Verilog language.

I'm practicing on Cyclone II board development.

My board is here (http://www.altera.com/products/devkits/altera/kit-cyc3.html)

but up to the present time, I cannot doing this

anybody can edit my code:

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// synthesis translate_off

`timescale 1ns / 1ps

// synthesis translate_on

// turn off superfluous verilog processor warnings

// altera message_level Level1

// altera message_off 10034 10035 10036 10037 10230 10240 10030

module ledr (

// inputs:

address,

chipselect,

clk,

reset_n,

write_n,

writedata,

// outputs:

out_port

)

;

output [7: 0] out_port;

input [ 1: 0] address;

input chipselect;

input clk;

input reset_n;

input write_n;

input [ 7: 0] writedata;

wire clk_en;

reg [ 7: 0] data_out;

wire [ 7: 0] out_port;

assign clk_en = 1;

//s1, which is an e_avalon_slave

always @(posedge clk or negedge reset_n)

begin

if (reset_n == 0)

data_out <= 0;

else if (chipselect && ~write_n && (address == 0))

data_out <= writedata[17 : 0];

end

assign out_port = data_out;

endmodule