久久久久久久999_99精品久久精品一区二区爱城_成人欧美一区二区三区在线播放_国产精品日本一区二区不卡视频_国产午夜视频_欧美精品在线观看免费

標題: 一個超聲波測距模塊,仿真testbench里Trig怎么處理? 求幫助 [打印本頁]

作者: TKNO1 時間: 2019-5-1 17:41
標題: 一個超聲波測距模塊,仿真testbench里Trig怎么處理? 求幫助
有那個大佬幫忙說一下仿真testbench里Trig怎么處理

5.69 KB, 下載次數: 3

作者: TKNO1 時間: 2019-5-1 17:45
module SRF_Control(sys_clk,sys_rst_n,echo,Distance,Trig);//《基于FPGA的數字系統設計與研究》
            input                      sys_clk;
            input                      sys_rst_n;
            input                      echo;
            output[13:0]             Distance;
            output                   Trig;



   reg                      Trig;
            reg[31:0]                Distance_r;
            assign                   Distance = Distance_r/2941;//calculate and output ultrasonic obstacle distance value
            reg[3:0]                   State;
            reg[31:0]                Trig_cnt;
            reg[31:0]                Timeout_cnt;
            reg[31:0]                echo_cnt;
            reg                      echo_r;

            always@(posedge sys_clk or negedge sys_rst_n)
            begin
                     if(!sys_rst_n)
                                       echo_r <= 1'b0;
                     else
                                       echo_r <= echo;
            end

            always@(posedge sys_clk or negedge sys_rst_n)
            begin
            if(!sys_rst_n)
                     begin
                     State       <= 4'd0 ;
                     Trig       <= 1'b0;
                     Trig_cnt <= 32'd0 ;
                     echo_cnt <= 32'd0 ;
                     Distance_r <= 32'd0 ;
                     Timeout_cnt <= 32'd0;
                     end
            else
                     begin
                     case(State)
                     4'd0:       begin
                                       Trig       <= 1'b0;
                                       Trig_cnt <= 32'd0;
                                       echo_cnt <= 32'd0;
                                       Timeout_cnt <= 32'd0;
                                       State       <= 4'd1;
                                       end
                     4'd1:       begin
                                       Trig       <= 1'b1;
                                       if(Trig_cnt==32'd500000)begin
                                                      Trig_cnt <= 32'd0;
                                                      State <= 4'd2;
                                                      end
                                       else begin
                                                      Trig_cnt <= Trig_cnt+1;
                                                      State <= 4'd1;
                        end
   end
                     4'd2:       begin
                                       Trig <= 1'b0;
                                       if(Trig_cnt == 32'd500)begin
                                                      Trig_cnt <= 32'd0;
                                                      State    <= 4'd3;
                                                      end
                                       else begin
                                                      Trig_cnt <= Trig_cnt+1;
                                                      State    <= 4'd2;
                                                      end
                                       end
                     4'd3:       begin
                                       if(!echo_r)
                                                      State <= 4'd4;
                                       else
                                                      State <= 4'd3;
                                       end
                     4'd4:       begin
                                       if(!echo_r)  State <= 4'd5;
                                       else if(Timeout_cnt == 32'd50000000)begin
                                                         Timeout_cnt <= 0;
                                                         State <= 4'd0;  end
                                       else begin
                                                         Timeout_cnt <= Timeout_cnt+1;
                                                         State <= 4'd4;  end
                                       end
                     4'd5:       begin
                                       if(!echo_r)  State <= 4'd6;
                                       else begin
                                                         echo_cnt <= echo_cnt+1;
                                                         State <= 4'd5;
                                             end
                                       end
                     4'd6:       begin
                                       Distance_r <= echo_cnt;
                                       if(Timeout_cnt == 32'd50000000) begin
                                                         Timeout_cnt <= 0;
                                                         State <= 4'd0; end
                                       else begin  Timeout_cnt <= Timeout_cnt+1;
                                                         State <= 4'd6; end
                                       State <= 4'd0;
                                       end
                     default:    State <= 4'd0;
                     endcase
                     end
            end
endmodule

歡迎光臨 (http://www.zg4o1577.cn/bbs/)

<ul id="ieics"></ul>