请问能否解释一下这段关于数字密码锁的代码

问题遇到的现象和发生背景

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module elock(clk,k1,k2,k3,k4,k5,k6,k7,k8,k9,Rst,ledsel,leddata);
    input clk,k1,k2,k3,k4,k5,k6,k7,k8,k9,Rst;
    output ledsel;
    output [7:0] leddata;
    reg [7:0] leddata;
    reg [1:0] count;
    reg [3:0] count1;
    reg [2:0] state,next_state;
    reg en,carry_out,open,error;
    reg k11,k22,k33,k44,k55,k66,k77,k88,k99,rst;

assign ledsel=1'b1;

always@(posedge clk)
begin
    if(k1==1'b1)    k11<=1'b1;
        else    k11<=1'b0;

    if(k2==1'b1)    k22<=1'b1;
        else    k22<=1'b0;

    if(k3==1'b1)    k33<=1'b1;
        else    k33<=1'b0;

    if(k4==1'b1)    k44<=1'b1;
        else    k44<=1'b0;

    if(k5==1'b1)    k55<=1'b1;
        else    k55<=1'b0;

    if(k6==1'b1)    k66<=1'b1;
        else    k66<=1'b0;

    if(k7==1'b1)    k77<=1'b1;
        else    k77<=1'b0;

    if(k8==1'b1)    k88<=1'b1;
        else    k88<=1'b0;

    if(k9==1'b1)    k99<=1'b1;
        else    k99<=1'b0;

    if(Rst==1'b1)    rst<=1'b1;
        else    rst<=1'b0;
    end

always@(posedge clk)
    begin
      state<=next_state;
    end

always@(state,en,k11,k22,k33,k44,k55,k66,k77,k88,k99,rst)
    begin
    if(rst)
      begin
            next_state<=3'b000;
            open<=1'b0;
      end
    case(state)
    3'b000:begin
                 if(k11&en)    next_state<=3'b001;
                 else    next_state<=3'b000; 
             end
    3'b001:begin
                 if(k22&en)    next_state<=3'b010;
                 else    next_state<=3'b001;
             end
    3'b010:begin
                 if(k33&en)    next_state<=3'b011;
                 else    next_state<=3'b010;
             end
    3'b011:begin
                 if(k44&en)    next_state<=3'b100;
                 else    next_state<=3'b011;
             end
    3'b100:begin
                 if(k55&en)    next_state<=3'b101;
                 else    next_state<=3'b100;
             end
    3'b101:open<=1'b1;
    default:next_state<=3'b000;
    endcase
    end

always@(posedge clk)
    begin
      if(rst)
           count1<=4'b0000;
      else if(open==1'b1)
             count1<=4'b1111;
              else if(en==1'b0)
                       count1<=4'b1110;
                      else if(en&(k11|k22|k33|k44|k55|k66|k77|k88|k99))
                              count1<=count1+4'b0001;
    end

always@(count1)
    if(count1<=4'b0101)
         en<=1'b1;
    else
        en<=1'b0;

always@(count1)
    case(count1)
     4'd0:leddata<=~8'b11000000;  
     4'd1:leddata<=~8'b11111001;  
     4'd2:leddata<=~8'b10100100;  
     4'd3:leddata<=~8'b10110000;
     4'd4:leddata<=~8'b10011001;
     4'd5:leddata<=~8'b10010010;
     4'd6:leddata<=~8'b10000011;
     4'd7:leddata<=~8'b11111000;
     4'd8:leddata<=~8'b10000000;  
     4'd9:leddata<=~8'b10011000;  
     4'b1111:leddata<=8'b0111_0011; 
     4'b1110:leddata<=8'b0111_1001; 
     default:leddata<=~8'b11000000;
    endcase
endmodule

运行结果及报错内容

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