Verilog Binary to gray code conversion

How to do binary to gray code conversion -

Verilog Code for Binary to Gray code conversion ->

Equation for Gray code

Hardware for Binary to Gray Code ->

/*Logic to convert binary numbers into Gray coded binary numbers is implemented in the following Verilog Code.
*/
module binary2gray();
reg clk;
reg rstn;
reg [5:0] counter_binary, counter_binary_reg, counter_gray, counter_gray_reg;
integer count, file_wr;

/* Initial block to generate clock and reset */
initial  begin
    clk = 0; rstn = 0;  #100 rstn = 1;
    forever begin
        #10 clk = !clk;
 end end

/* Synchronous Logic for registering the data and incrementing the counter for binary data */
always @ (posedge clk or negedge rstn)
begin
    if (!rstn) begin
        counter_binary_reg <= 'b0;
        counter_gray_reg <= 'b0;  end
    else begin
        counter_binary_reg <= counter_binary + 1;
        counter_gray_reg <= counter_gray;
        $display("binary number= 6'b%b : gray en-coded binary number = 6'b%b", counter_binary_reg, counter_gray_reg);   end end

/* Logic is to get Gray code from Binary code */
function[5:0] binary2gray ;
    input[5:0] value;
    integer i;
    begin
        binary2gray[5] = value[5];
        for (i=5; i>0; i = i - 1)
            binary2gray[i-1] = value[i] ^ value[i - 1];
    end
endfunction

/* Get gray encoded output */
always @(*)
begin
  counter_gray = counter_gray_reg;
  counter_binary = counter_binary_reg;
  counter_gray = binary2gray(counter_binary_reg); end
endmodule

Verilog File -> Binary_to_gray.v 

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