单独按键消抖

Diabloa · 发表于 2018-12-5 15:08

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单独按键消抖

module key_filter(clk, rst_n, key_n, click_n);

      parameter MASK_TIME = 100;

      input clk;
      input rst_n;
      input key_n;
      output reg click_n;

      localparam s0 = 1'b0;
      localparam s1 = 1'b1;

      reg temp;
      reg [31:0] count;
      reg state;

      always @ (posedge clk, negedge rst_n)
      begin
            if (!rst_n)
                     begin
                              count <= 0;
                              click_n <= 1;
                              temp <= 1;
                              state <= s0;
                     end
            else
                     case (state)
                              s0       :       if (key_n == temp)
                                                      state <= s0;
                                             else
                                                      begin
                                                            temp <= key_n;
                                                            state <= s1;
                                                      end

                              s1       :       if (key_n == temp)
                                                      if (count < MASK_TIME)
                                                            begin
                                                                     count <= count + 1;
                                                                     state <= s1;
                                                            end
                                                      else
                                                            begin
                                                                     click_n <= temp;
                                                                     count <= 0;
                                                                     state <= s0;
                                                            end
                                             else
                                                      begin
                                                            count <= 0;
                                                            temp <= key_n;
                                                            state <= s1;
                                                      end
                     endcase
      end

endmodule

helendcany · 发表于 2018-12-5 16:20

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单独按键消抖

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