FPGA自计数六位共阳极数码管动态显示2（调用task的方法）

 `timescale 1ns/1ps
 module adc_dis(
                clk ,
                rst_n ,
                sm_seg ,
                sm_bit
                 );
 
 input clk;//50HZ
 input rst_n;
 output[:] sm_seg;//段选
 output[:] sm_bit;//位选
 
 reg [:] sm_seg;
 reg [:] sm_bit;
 reg [:] count;
 reg [:] count2;
 reg [:] i;//数码管位数
 reg clk1, clk2;
 reg [:]ge,shi,bai,qian,wan,swan;
 reg [:] ge_reg,shi_reg,bai_reg,qian_reg,wan_reg,swan_reg;
 
 parameter//共阳极
         led_GYA0 = 'hc0,     //''
         led_GYA1 = 'hf9,     //''
         led_GYA2 = 'ha4,     //''
         led_GYA3 = 'hb0,     //''
         led_GYA4 = 'h99,     //''
         led_GYA5 = 'h92,     //''
         led_GYA6 = 'h82,     //''
         led_GYA7 = 'hf8,     //''
         led_GYA8 = 'h80,     //''
         led_GYA9 = 'h90;     //''
 
 /****************分频1S*****************/
 always@(posedge clk or negedge rst_n) begin
 if(!rst_n) begin //同步复位
            clk2  <= 'b0;
            count2 <= 'b0;
            end
 else if(count2 == 'd24999999) begin //高低电平转换 5*10^7*20ns=10^9ns=1s
                                 clk2 <= ~clk2;
                                 count2 <= 'b0;
                                 end
 else begin
      count2 <= count2 + 'b1; //计数
      end
  end
 
 /******************计数*********************/
 always@(posedge clk2 or negedge rst_n) begin//个位处理
 if(!rst_n) begin
            ge <= 'b0000;
            shi <= 'b0000;
            bai <= 'b0000;
            qian <= 'b0000;
            wan <= 'b0000;
            swan <= 'b0000;
            end
 else if(ge == 'b1010) begin //个位等于10
                        ge  = 'b0000;
                        shi = shi + 'b1;
                        if(shi == 'b1010) begin//十位等于10
                                           shi = 'b0000;
                                           bai = bai + 'b1;
                                           if(bai == 'b1010) begin//百位等于10
                                                              bai  = 'b0000;
                                                              qian = qian + 'b1;
                                                              if(qian == 'b1010) begin//千位等于10
                                                                                  qian = 'b0000;
                                                                                  wan  = wan + 'b1;
                                                                                  if(wan == 'b1010) begin//万位等于10
                                                                                                     wan  = 'b0000;
                                                                                                     swan = swan + 'b1;
                                                                                                     if(swan == 'b1010) begin//十万位等于10
                                                                                                                         ge <= 'b0000;
                                                                                                                         shi <= 'b0000;
                                                                                                                         bai <= 'b0000;
                                                                                                                         qian <= 'b0000;
                                                                                                                         wan <= 'b0000;
                                                                                                                         swan <= 'b0000;
                                                                                                                         end
                                                                                                     end
                                                                                  end
                                                              end
                                         end
                          end
 else  begin
         ge <= ge + 'b1;
         end
 
 end
 
 /***************编码*******************/
 always@(posedge clk2 or negedge rst_n) begin
 //case(ge)
 //     4'b0000: ge_reg <= led_GYA0;
 //     4'b0001: ge_reg <= led_GYA1;
 //     4'b0010: ge_reg <= led_GYA2;
 //     4'b0011: ge_reg <= led_GYA3;
 //     4'b0100: ge_reg <= led_GYA4;
 //     4'b0101: ge_reg <= led_GYA5;
 //     4'b0110: ge_reg <= led_GYA6;
 //     4'b0111: ge_reg <= led_GYA7;
 //     4'b1000: ge_reg <= led_GYA8;
 //     4'b1001: ge_reg <= led_GYA9;
 //     default: ge_reg <= led_GYA0;
 //endcase
 //
 //case(shi)
 //     4'b0000: shi_reg <= led_GYA0;
 //     4'b0001: shi_reg <= led_GYA1;
 //     4'b0010: shi_reg <= led_GYA2;
 //     4'b0011: shi_reg <= led_GYA3;
 //     4'b0100: shi_reg <= led_GYA4;
 //     4'b0101: shi_reg <= led_GYA5;
 //     4'b0110: shi_reg <= led_GYA6;
 //     4'b0111: shi_reg <= led_GYA7;
 //     4'b1000: shi_reg <= led_GYA8;
 //     4'b1001: shi_reg <= led_GYA9;
 //     default: shi_reg <= led_GYA0;
 //endcase
 //
 //case(bai)
 //     4'b0000: bai_reg <= led_GYA0;
 //     4'b0001: bai_reg <= led_GYA1;
 //     4'b0010: bai_reg <= led_GYA2;
 //     4'b0011: bai_reg <= led_GYA3;
 //     4'b0100: bai_reg <= led_GYA4;
 //     4'b0101: bai_reg <= led_GYA5;
 //     4'b0110: bai_reg <= led_GYA6;
 //     4'b0111: bai_reg <= led_GYA7;
 //     4'b1000: bai_reg <= led_GYA8;
 //     4'b1001: bai_reg <= led_GYA9;
 //     default: bai_reg <= led_GYA0;
 //endcase
 //
 //case(qian)
 //     4'b0000: qian_reg <= led_GYA0;
 //     4'b0001: qian_reg <= led_GYA1;
 //     4'b0010: qian_reg <= led_GYA2;
 //     4'b0011: qian_reg <= led_GYA3;
 //     4'b0100: qian_reg <= led_GYA4;
 //     4'b0101: qian_reg <= led_GYA5;
 //     4'b0110: qian_reg <= led_GYA6;
 //     4'b0111: qian_reg <= led_GYA7;
 //     4'b1000: qian_reg <= led_GYA8;
 //     4'b1001: qian_reg <= led_GYA9;
 //     default: qian_reg <= led_GYA0;
 //endcase
 //
 //case(wan)
 //     4'b0000: wan_reg <= led_GYA0;
 //     4'b0001: wan_reg <= led_GYA1;
 //     4'b0010: wan_reg <= led_GYA2;
 //     4'b0011: wan_reg <= led_GYA3;
 //     4'b0100: wan_reg <= led_GYA4;
 //     4'b0101: wan_reg <= led_GYA5;
 //     4'b0110: wan_reg <= led_GYA6;
 //     4'b0111: wan_reg <= led_GYA7;
 //     4'b1000: wan_reg <= led_GYA8;
 //     4'b1001: wan_reg <= led_GYA9;
 //     default: wan_reg <= led_GYA0;
 //endcase
 //
 //case(swan)
 //     4'b0000: swan_reg <= led_GYA0;
 //     4'b0001: swan_reg <= led_GYA1;
 //     4'b0010: swan_reg <= led_GYA2;
 //     4'b0011: swan_reg <= led_GYA3;
 //     4'b0100: swan_reg <= led_GYA4;
 //     4'b0101: swan_reg <= led_GYA5;
 //     4'b0110: swan_reg <= led_GYA6;
 //     4'b0111: swan_reg <= led_GYA7;
 //     4'b1000: swan_reg <= led_GYA8;
 //     4'b1001: swan_reg <= led_GYA9;
 //     default: swan_reg <= led_GYA0;
 //endcase
 BIANMA(ge, ge_reg);
 BIANMA(shi, shi_reg);
 BIANMA(bai, bai_reg);
 BIANMA(qian, qian_reg);
 BIANMA(wan, wan_reg);
 BIANMA(swan, swan_reg);
 
 end
 
 /****************分频1MS*****************/
 always@(posedge clk or negedge rst_n) begin
 if(!rst_n) begin //同步复位
            clk1  <= 'b0;
            count <= 'b0;
            end
 else if(count == 'd24999)begin //高低电平转换 25000*20=500000ns=0.5ms
                            clk1 <= ~clk1;
                            count <= 'b0;
                            end
 else begin
      count <= count + 'b1; //计数
      end
  end
 
 /************数码管位数循环****************/
 always@(posedge clk1 or negedge rst_n) begin
 
 if(!rst_n) begin //同步复位
             i <= 'b0000;
             end
 else if(i == 'b0101) begin
                       i <= 'b0000;
                       end
212 else begin
      i <= i + 'b1;
      end
 end
 
 /************数码管显示****************/
 always@(posedge clk1 or negedge rst_n) begin
         case(i)
             'b0000: begin sm_seg <= ge_reg;    sm_bit <= 6'b01_1111;  end
             'b0001: begin sm_seg <= shi_reg;   sm_bit <= 6'b10_1111;  end
             'b0010: begin sm_seg <= bai_reg;   sm_bit <= 6'b11_0111;  end
             'b0011: begin sm_seg <= qian_reg;  sm_bit <= 6'b11_1011;  end
             'b0100: begin sm_seg <= wan_reg;   sm_bit <= 6'b11_1101;  end
             'b0101: begin sm_seg <= swan_reg;  sm_bit <= 6'b11_1110;  end
             default: begin sm_seg <= led_GYA0;  sm_bit <= 'b11_1111;  end
         endcase
    end         
 
 task BIANMA;
 input[:] wei;//哪个位
 output[:] wei_reg; //这个位上此时的数据
 reg [:] wei_reg;
 begin
 case(wei)
       'b0000: wei_reg <= led_GYA0;
       'b0001: wei_reg <= led_GYA1;
       'b0010: wei_reg <= led_GYA2;
       'b0011: wei_reg <= led_GYA3;
       'b0100: wei_reg <= led_GYA4;
       'b0101: wei_reg <= led_GYA5;
       'b0110: wei_reg <= led_GYA6;
       'b0111: wei_reg <= led_GYA7;
       'b1000: wei_reg <= led_GYA8;
       'b1001: wei_reg <= led_GYA9;
       default: wei_reg <= led_GYA0;
 endcase
 end
 endtask
 
 endmodule