测试方波的频率计

Ferrya · 发表于 2018-12-6 07:00

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测试方波的频率计

module pinlvji (clk, rst_n, wave, zhankongbi, pinlv);

      input clk;
      input rst_n;
      input wave;

      output reg [6:0] zhankongbi;
      output reg [19:0] pinlv;

      reg [25:0] t_low_count;
      reg [25:0] t_high_count;

      reg [25:0] t_low;
      reg [25:0] t_high;

      reg state;

      always @ (*)
            begin
                     zhankongbi = 100*t_high/(t_high + t_low);
                     pinlv = 1_000_000_000/(t_high*10 + t_low*10);
            end

      always @ (posedge clk)
            begin
                     if (rst_n == 0)
                              begin
                                    t_low <= 0;
                                    t_high <= 0;
                                    t_low_count <= 0;
                                    t_high_count <= 0;
                                    state <= 0;
                              end
                     else
                              begin
                                    case (state)
                                             0 : begin
                                                            if (wave == 1)
                                                                     begin
                                                                              t_high_count <= t_high_count + 1;
                                                                              state <= 0;
                                                                     end
                                                            else
                                                                     begin
                                                                              t_high <= t_high_count;
                                                                              t_high_count <= 0;
                                                                              state <= 1;
                                                                     end
                                                      end

                                             1 : begin
                                                            if (wave == 0)
                                                                     begin
                                                                              t_low_count <= t_low_count + 1;
                                                                              state <= 1;
                                                                     end
                                                            else
                                                                     begin
                                                                              t_low_count <= 0;
                                                                              t_low <= t_low_count;
                                                                              state <= 0;
                                                                     end
                                                      end

                                             default : state <= 0;

                                    endcase
                              end
            end

endmodule

Demyar · 发表于 2018-12-6 15:18

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fanichicl · 发表于 2018-12-6 15:18

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测试方波的频率计

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