FPGA 每隔10ms，让LED灯的一个8状态循环执行一次

代码内容如下：

module counter_led_6(
    Clk,
    Reset_n,
    Ctrl,
    Time,
    Led
);
    input Clk;
    input Reset_n;
    input [7:0]Ctrl;
    input [31:0]Time;
    output reg Led;
 
    reg [31:0]counter;
    reg EN;
    
    reg [18:0]counter0;
    //10ms周期定时器
    always@(posedge Clk or negedge Reset_n)
    if(!Reset_n)
        counter0 <= 0;
    else if(counter0 == 500000 - 1)
        counter0 <= 0;
    else
        counter0 <= counter0 + 1'b1;
        
    always@(posedge Clk or negedge Reset_n)
    if(!Reset_n)
        EN <= 0;
    else if(counter0 == 0)
        EN <= 1;
    else if((counter2 == 7) && (counter == Time - 1))
        EN <= 0;
      
    always@(posedge Clk or negedge Reset_n)
    if(!Reset_n)
        counter <= 0;
    else if(EN)begin
        if(counter == Time - 1)
            counter <= 0;
        else
            counter <= counter + 1'b1;
    end
    else
        counter <= 0;
    
    reg [2:0]counter2;
    always@(posedge Clk or negedge Reset_n)
    if(!Reset_n) 
        counter2 <= 0; 
    else if(EN)begin
        if(counter == Time - 1)
            counter2 <= counter2 + 1'b1;
    end
    else
        counter2 <= 0;     
    always@(posedge Clk or negedge Reset_n)
    if(!Reset_n)
        Led <= 0;
    else case(counter2)
        0:Led <= Ctrl[0];
        1:Led <= Ctrl[1];
        2:Led <= Ctrl[2];
        3:Led <= Ctrl[3];
        4:Led <= Ctrl[4];
        5:Led <= Ctrl[5];
        6:Led <= Ctrl[6];
        7:Led <= Ctrl[7];
        default:Led <= Led;
    endcase
            
endmodule