基于fpga的超声波测距数码管显示

Question

hc—sr04超声波测距模块
50M的fpga板
求可用程序

Answer 1

reg    [19:0]  count_div;    //定义分频计数寄存器

always @(posedge clk)       //分频产生1k时钟
begin
    if(count_div>=20'd100000)
    begin
        count_div<=20'd0;
        clk_1k<=1'b0;
    end
    else
    begin
        count_div <= count_div + 20'b1;
        if(count_div<=20'd50000)
            clk_1k<=1'b0;
        else
            clk_1k<=1'b1;
    end  
end
assign dig = dig_r;     //输出数码管选择
assign seg = {dip,seg_r};   //输出数码管译码结果 
always @(posedge clk_1k)      //计数进程
begin
    count <= count + 1'b1;
end
always @(posedge clk_1k)         
begin
    case(count)      //选择扫描显示数据
    3'd0:disp_dat = seg_data1; //第一个数码管
    3'd1:disp_dat = seg_data2; //第二个数码管
    3'd2:disp_dat = seg_data3; //第三个数码管
    3'd3:disp_dat = seg_data4; //第四个数码管
    endcase
    case(count)      //选择数码管显示位
    3'd0:dig_r = 4'b1000;  //选择第一个数码管显示
    3'd1:dig_r = 4'b0100;  //选择第二个数码管显示
    3'd2:dig_r = 4'b0010;  //选择第三个数码管显示
    3'd3:dig_r = 4'b0001;  //选择第四个数码管显示
    endcase 
end
always @(disp_dat)
begin
    case(disp_dat[3:0])    //七段译码  
    4'h0:seg_r=7'b0000001;  //显示0
    4'h1:seg_r=7'b1001111;  //显示1
    4'h2:seg_r=7'b0010010;  //显示2
    4'h3:seg_r=7'b0000110;  //显示3
    4'h4:seg_r=7'b1001100;  //显示4
    4'h5:seg_r=7'b0100100;  //显示5
    4'h6:seg_r=7'b0100000;  //显示6
    4'h7:seg_r=7'b0001111;  //显示7
    4'h8:seg_r=7'b0000000;  //显示8
    4'h9:seg_r=7'b0000100;  //显示9
    4'ha:seg_r=7'b0100000;  //显示a
    4'hb:seg_r=7'b1100000;  //显示b
    4'hc:seg_r=7'b0110001;  //显示c
    4'hd:seg_r=7'b1000010;  //显示d
    4'he:seg_r=7'b0010000;  //显示e
    4'hf:seg_r=7'b0111000;  //显示f
endcase
    case(disp_dat[7])    //产生小数点
    1'b0:dip=1'b1;
    dip=1'b0;
    endcase
end
endmodule