SEG数码管动态显示，采用扫描方式，轮询，只要满足刷新频率快于人眼视觉暂留时间即可。

程序比较简单，1s间隔分别显示0~7,8~F





代码：

//SEG数码管模块
module m_seg(clk, rst, seg, dig);
 
input clk; //系统时钟输入,50MHz
input rst; //系统复位输入
 
output[7:0] seg; //seg输出
output[7:0] dig; //dig输出

reg[6:0] seg_r;
reg[7:0] dig;

assign seg = { 1'b1, seg_r };
 
reg[15:0] scan; //扫描

//扫描时钟
always @(posedge clk or negedge rst)
begin
    if(rst == 0)
        scan = 16'd0;
    else
        scan = scan + 1'b1;
end

//片选
always @(scan[15:13])
begin
    case(scan[15:13])   
        3'd0: dig <= ~8'h01;   
        3'd1: dig <= ~8'h02;   
        3'd2: dig <= ~8'h04;   
        3'd3: dig <= ~8'h08;   
        3'd4: dig <= ~8'h10;   
        3'd5: dig <= ~8'h20;   
        3'd6: dig <= ~8'h40;    
        3'd7: dig <= ~8'h80;   
    endcase
end

//译码
always @(scan[15:13] or n)
begin
    case(scan[15:13] + n)
        0: seg_r <= 7'b100_0000; // 0
        1: seg_r <= 7'b111_1001; // 1
        2: seg_r <= 7'b010_0100; // 2
        3: seg_r <= 7'b011_0000; // 3
        4: seg_r <= 7'b001_1001; // 4
        5: seg_r <= 7'b001_0010; // 5
        6: seg_r <= 7'b000_0010; // 6
        7: seg_r <= 7'b101_1000; // 7
        8: seg_r <= 7'b000_0000; // 8
        9: seg_r <= 7'b001_1000; // 9
        10: seg_r <= 7'b000_1000; // A
        11: seg_r <= 7'b000_0011; // b
        12: seg_r <= 7'b100_0110; // c
        13: seg_r <= 7'b010_0001; // d
        14: seg_r <= 7'b000_0110; // E
        15: seg_r <= 7'b000_1110; // F
        default: seg_r <= 7'b111_1111;
    endcase
end

reg    clk_1s; //分频时钟               
reg    [25:0] clk_cnt; //分频计数器

//系统时钟分频，产生1s的时钟
always @(posedge clk)
begin
    if(clk_cnt == 25'd25000000)
    begin
        clk_1s = ~clk_1s;
        clk_cnt = 25'd0;
    end
    else
    begin
        clk_cnt = clk_cnt + 1'b1;
    end
end

reg[3:0] n;

always @(posedge clk_1s or negedge rst)
begin
    if(rst == 0)
        n <= 4'd0;
    else
        n <= n + 4'd8;
end

endmodule

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