leddisp.v

8位7段LED显示源码

//LEDDisp.v   v0.93   2006-04-24
//八位数码管动态译码显示，与FPGA母板配套
//时钟：clk用M为单位输入
//扫描频率：约122Hz
//闪烁频率：约1.6Hz
//data：8×4位输入BCD数据
//mode：8*4位显示模式。每位4比特，其中最高位灭灯(1有效)，次高位为闪烁位(1有效)
//      低位为显示扩展位(1有效)，次低位为小数点显示位(1有效)
//8段输出segout和8位输出posout均带锁存
//segdir、posdir分别为段码、位码输出的245方向控制位
//引脚连接说明：
//时钟引脚 Clk－PIN17；
//位码引脚 posout[0]/PIN119/LCS8(右)-posout[1]/PIN112/LCS7-posout[2]/PIN110/LCS6-posout[3]/PIN108/LCS5；
//位码引脚 posout[4]/PIN106/LCS4-posout[5]/PIN104/LCS3-posout[6]/PIN100/LCS2-posout[7]/PIN98/LCS1(左)；
//段码引脚 segout[0]/PIN132/SEGA-segout[1]/PIN134/SEGB-segout[2]/PIN140/SEGC-segout[3]/PIN142/SEGD；
//段码引脚 segout[4]/PIN144/SEGE-segout[5]/PIN3/SEGF-segout[6]/PIN6/SEGG-segout[7]/PIN10/SEGH；
//245方向引脚 posdir-PIN35；segdir-PIN41
module LEDDisp(clk,data,mode,segout,posout,segdir,posdir);
  input clk;
  input [31:0] data;
  input [31:0] mode;

  parameter CLKxM = 10;

  output segdir,posdir;
  output [7:0] segout;
  output [7:0] posout;

  reg [7:0] segout;
  reg [7:0] posout;
  integer i,j;

  assign segdir = 1'b1;
  assign posdir = 1'b1;

  always @(posedge clk)
    begin
      i = i + 1;
      if((i>>10)==CLKxM)
      begin
        case(posout)
          8'b11111110:  begin posout=8'b11111101;segout=codelist({mode[7:4],data[7:4]}); end
          8'b11111101:  begin posout=8'b11111011;segout=codelist({mode[11:8],data[11:8]}); end
          8'b11111011:  begin posout=8'b11110111;segout=codelist({mode[15:12],data[15:12]}); end
          8'b11110111:  begin posout=8'b11101111;segout=codelist({mode[19:16],data[19:16]}); end
          8'b11101111:  begin posout=8'b11011111;segout=codelist({mode[23:20],data[23:20]}); end
          8'b11011111:  begin posout=8'b10111111;segout=codelist({mode[27:24],data[27:24]}); end
          8'b10111111:  begin posout=8'b01111111;segout=codelist({mode[31:28],data[31:28]}); end
          default:  begin posout=8'b11111110;segout=codelist({mode[3:0],data[3:0]}); end
        endcase
        i = 0;
        j = j + 1;
      end
    end

  function [7:0] codelist;
    input [7:0] codeno;
    begin
      case(codeno&8'hbf)
        8'h00: codelist=8'h3f;//0
        8'h01: codelist=8'h06;//1
        8'h02: codelist=8'h5b;//2
        8'h03: codelist=8'h4f;//3
        8'h04: codelist=8'h66;//4
        8'h05: codelist=8'h6d;//5
        8'h06: codelist=8'h7d;//6
        8'h07: codelist=8'h07;//7
        8'h08: codelist=8'h7f;//8
        8'h09: codelist=8'h6f;//9
        8'h0a: codelist=8'h77;//A
        8'h0b: codelist=8'h7c;//b
        8'h0c: codelist=8'h39;//C
        8'h0d: codelist=8'h5e;//d
        8'h0e: codelist=8'h79;//E
        8'h0f: codelist=8'h71;//F
        8'h10: codelist=8'h00;//全灭
        8'h11: codelist=8'h80;//小数点
        8'h12: codelist=8'h40;//减号
        8'h1f: codelist=8'h06;//全亮
        8'h20: codelist=8'hbf;//0.
        8'h21: codelist=8'h86;//1.
        8'h22: codelist=8'hdb;//2.
        8'h23: codelist=8'hcf;//3.
        8'h24: codelist=8'he6;//4.
        8'h25: codelist=8'hed;//5.
        8'h26: codelist=8'hfd;//6.
        8'h27: codelist=8'h87;//7.
        8'h28: codelist=8'hef;//8.
        8'h29: codelist=8'hef;//9.
        8'h2a: codelist=8'hf7;//A.
        8'h2b: codelist=8'hfc;//b.
        8'h2c: codelist=8'hb9;//C.
        8'h2d: codelist=8'hde;//d.
        8'h2e: codelist=8'hf9;//E.
        8'h2f: codelist=8'hf1;//F.   
        default: codelist=8'h00;//全灭
      endcase
      if(j==600)
        j = 0;
      else if(((codeno&8'h40)!=8'h00)&&(j<=300)) 
        codelist=8'h00;//闪烁控制
    end
  endfunction
endmodule