EGO1—实现拨码开关控制数码管显示数值

使用软件： Vivado
开发板： EGO1采用Xilinx Artix-7系列XC7A35T-1CSG324C FPGA

实现功能

16个拨码开关，每两个控制一个数码管的数值变化

开发板配置

七段数码管

数码管为共阴极数码管，即公共极输入低电平。共阴极由三极管驱动，FPGA需要提供正向信号。同时段选端连接高电平，数码管上的对应位置才可以被点亮。因此，FPGA 输出有效的片选信号和段选信号都应该是高电平。

管脚约束

A0~DP0控制DN0_K1 — DN0_K4的数码管的段选
A1~DP1控制DN1_K1—DN1_K4的数码管的段选

代码

verilog代码

module v_smg_1(
    input clk,
    input rst,
    input[15:0] sw, //开关
    output[7:0] seg,//段选，高有效
    output[7:0] seg1,
    output[7:0] an //位选，低有效
);
    reg[18:0] divclk_cnt = 0;//分频计数器
    reg divclk = 0;//分频后的时钟
    reg[7:0] seg=0;//段码
    reg[7:0] seg1=0;
    reg[7:0] an=8'b00000001;//位码
    reg[3:0] disp_dat=0;//要显示的数据
    reg[2:0] disp_bit=0;//要显示的位
    parameter maxcnt = 50000;// 周期：50000*2/100M
    always@(posedge clk)
    begin
        if(divclk_cnt==maxcnt)
        begin
            divclk=~divclk;
            divclk_cnt=0;
        end
        else
        begin
            divclk_cnt=divclk_cnt+1'b1;
        end
    end
    always@(posedge divclk) begin
        if(disp_bit >= 7)
            disp_bit=0;
         else
            disp_bit=disp_bit+1'b1;
         case (disp_bit)
            3'b000 :
            begin
                disp_dat=sw[1:0];
                an=8'b00000001;//显示第一个数码管，高电平有效
            end
            3'b001 :
            begin
                disp_dat=sw[3:2];
                an=8'b00000010;//显示第二个数码管，低电平有效
            end
            3'b010 :
            begin
                disp_dat=sw[5:4];
                an=8'b00000100;//显示第三个数码管，低电平有效
            end
            3'b011 :
            begin
                disp_dat=sw[7:6];
                an=8'b00001000;//显示第四个数码管，低电平有效
            end
            3'b100 :
            begin
                disp_dat=sw[9:8];
                an=8'b00010000;//显示第五个数码管，低电平有效
            end
            3'b101 :
            begin
                disp_dat=sw[11:10];
                an=8'b00100000;//显示第六个数码管，低电平有效
            end
            3'b110 :
            begin
                disp_dat=sw[13:12];
                an=8'b01000000;//显示第七个数码管，低电平有效
            end
            3'b111 :
            begin
                disp_dat=sw[15:14];
                an=8'b10000000;//显示第八个数码管，低电平有效
            end
            default:
            begin
                disp_dat=0;
                an=8'b00000000;
            end
        endcase
    end
    always@(disp_dat)
    begin
        if(an > 8'b00001000) begin
            case (disp_dat)
            //显示0—F
            4'h0 : seg = 8'hfc;
            4'h1 : seg = 8'h60;
            4'h2 : seg = 8'hda;
            4'h3 : seg = 8'hf2;
            4'h4 : seg = 8'h66;
            4'h5 : seg = 8'hb6;
            4'h6 : seg = 8'hbe;
            4'h7 : seg = 8'he0;
            4'h8 : seg = 8'hfe;
            4'h9 : seg = 8'hf6;
            4'ha : seg = 8'hee;
            4'hb : seg = 8'h3e;
            4'hc : seg = 8'h9c;
            4'hd : seg = 8'h7a;
            4'he : seg = 8'h9e;
            4'hf : seg = 8'h8e;
            endcase
        end
        else begin
            case (disp_dat)
            //显示0-F
            4'h0 : seg1 = 8'hfc;
            4'h1 : seg1 = 8'h60;
            4'h2 : seg1 = 8'hda;
            4'h3 : seg1 = 8'hf2;
            4'h4 : seg1 = 8'h66;
            4'h5 : seg1 = 8'hb6;
            4'h6 : seg1 = 8'hbe;
            4'h7 : seg1 = 8'he0;
            4'h8 : seg1 = 8'hfe;
            4'h9 : seg1 = 8'hf6;
            4'ha : seg1 = 8'hee;
            4'hb : seg1 = 8'h3e;
            4'hc : seg1 = 8'h9c;
            4'hd : seg1 = 8'h7a;
            4'he : seg1 = 8'h9e;
            4'hf : seg1 = 8'h8e;
            endcase
        end
    end
endmodule

约束文件

## clk
set_property PACKAGE_PIN P17 [get_ports clk]
set_property IOSTANDARD LVCMOS33 [get_ports clk]
## switch
set_property PACKAGE_PIN P5 [get_ports {sw[1]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[1]}]
set_property PACKAGE_PIN P4 [get_ports {sw[0]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[0]}]
set_property PACKAGE_PIN P3 [get_ports {sw[3]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[3]}]
set_property PACKAGE_PIN P2 [get_ports {sw[2]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[2]}]
set_property PACKAGE_PIN R2 [get_ports {sw[5]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[5]}]
set_property PACKAGE_PIN M4 [get_ports {sw[4]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[4]}]
set_property PACKAGE_PIN N4 [get_ports {sw[7]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[7]}]
set_property PACKAGE_PIN R1 [get_ports {sw[6]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[6]}]
set_property PACKAGE_PIN U3 [get_ports {sw[9]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[9]}]
set_property PACKAGE_PIN U2 [get_ports {sw[8]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[8]}]
set_property PACKAGE_PIN V2 [get_ports {sw[11]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[11]}]
set_property PACKAGE_PIN V5 [get_ports {sw[10]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[10]}]
set_property PACKAGE_PIN V4 [get_ports {sw[13]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[13]}]
set_property PACKAGE_PIN R3 [get_ports {sw[12]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[12]}]
set_property PACKAGE_PIN T3 [get_ports {sw[15]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[15]}]
set_property PACKAGE_PIN T5 [get_ports {sw[14]}]
set_property IOSTANDARD LVCMOS33 [get_ports {sw[14]}]

##smg位码
set_property PACKAGE_PIN G2 [get_ports an[7]]
set_property IOSTANDARD LVCMOS33 [get_ports an[7]]
set_property PACKAGE_PIN C2 [get_ports an[6]]
set_property IOSTANDARD LVCMOS33 [get_ports an[6]]
set_property PACKAGE_PIN C1 [get_ports an[5]]
set_property IOSTANDARD LVCMOS33 [get_ports an[5]]
set_property PACKAGE_PIN H1 [get_ports an[4]]
set_property IOSTANDARD LVCMOS33 [get_ports an[4]]
set_property PACKAGE_PIN G1 [get_ports an[3]]
set_property IOSTANDARD LVCMOS33 [get_ports an[3]]
set_property PACKAGE_PIN F1 [get_ports an[2]]
set_property IOSTANDARD LVCMOS33 [get_ports an[2]]
set_property PACKAGE_PIN E1 [get_ports an[1]]
set_property IOSTANDARD LVCMOS33 [get_ports an[1]]
set_property PACKAGE_PIN G6 [get_ports an[0]]
set_property IOSTANDARD LVCMOS33 [get_ports an[0]]

## 段码
set_property PACKAGE_PIN B4 [get_ports {seg[7]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[7]}]
set_property PACKAGE_PIN A4 [get_ports {seg[6]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[6]}]
set_property PACKAGE_PIN A3 [get_ports {seg[5]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[5]}]
set_property PACKAGE_PIN B1 [get_ports {seg[4]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[4]}]
set_property PACKAGE_PIN A1 [get_ports {seg[3]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[3]}]
set_property PACKAGE_PIN B3 [get_ports {seg[2]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[2]}]
set_property PACKAGE_PIN B2 [get_ports {seg[1]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[1]}]
set_property PACKAGE_PIN D5 [get_ports {seg[0]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg[0]}]

# 段码2
set_property PACKAGE_PIN D4 [get_ports {seg1[7]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[7]}]
set_property PACKAGE_PIN E3 [get_ports {seg1[6]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[6]}]
set_property PACKAGE_PIN D3 [get_ports {seg1[5]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[5]}]
set_property PACKAGE_PIN F4 [get_ports {seg1[4]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[4]}]
set_property PACKAGE_PIN F3 [get_ports {seg1[3]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[3]}]
set_property PACKAGE_PIN E2 [get_ports {seg1[2]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[2]}]
set_property PACKAGE_PIN D2 [get_ports {seg1[1]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[1]}]
set_property PACKAGE_PIN H2 [get_ports {seg1[0]}]
set_property IOSTANDARD LVCMOS33 [get_ports {seg1[0]}]

结果