四位密码锁*电子密码锁的设计

四位密码锁大实验：

功能：

题目：电子密码锁的设计  

 [设计要求]

（1）设计一个开锁密码至少为4位数字（或更多）的密码锁。

（2）当开锁按扭开关（可设置8位或更多，其中只有4位有效，其余位为虚设）的输入代码等于所设密码时启动开锁控制电路，并且用绿灯亮、红灯灭表示开锁状态。

（3）从第一个按扭触动后的5秒内若未能将锁打开，则电路自动复位并发出报警信号，同时用绿灯灭、红灯亮表示关锁状态。 

附加功能：

（1）可以设置密码，通过设置密码按钮SP（S4）设置，且可以重新设置新密码。任何情况下按SP后输入都可以设置密码。

（2）五秒计时采用倒计时显示在开发板的七段数码管上。五秒后发出警报（绿灯亮）。

（3）能记录按键输入密码的次数（0-9）。

（4）能清零输入次数而不改变密码。

代码：

module index(input clk,input pw_1, input pw_2, input pw_3, input pw_4, input pw_5, input pw_6, input pw_7, input pw_8,input sti_0, input sti_1, input sti_2,output x, output y,output reg red, output reg green, output reg alarm,    output reg num0_1, output reg num0_2, output reg num0_3, output reg num0_4,    output reg num0_5, output reg num0_6, output reg num0_7, output reg num0_8,     output reg num1_1, output reg num1_2, output reg num1_3, output reg num1_4,    output reg num1_5, output reg num1_6, output reg num1_7, output reg num1_8);/* * clk : clock * pw  : password * sti : stimulation * red/green : output LED * num: nixie * */    reg ctrl;    reg cc;assign x = 1;assign y = 1;    initial begin        cc <= 1'b0;        alarm <= 1'b0;        ctrl <= 1'b0;        red <= 1'b1;        green <= 1'b0;        num0_1 <= 1'b1;        num0_2 <= 1'b1;        num0_3 <= 1'b1;        num0_4 <= 1'b1;        num0_5 <= 1'b1;        num0_6 <= 1'b1;        num0_8 <= 1'b1;        num1_1 <= 1'b1;        num1_2 <= 1'b0;        num1_3 <= 1'b1;        num1_4 <= 1'b1;        num1_5 <= 1'b0;        num1_6 <= 1'b1;        num1_7 <= 1'b1;    end    // CLK 分频reg CLK;parameter N = 20000000;reg [31:0]ip;reg [31:0]ipr;always @(posedge clk) begin        if(ip < N/2) begin            ip <= ip + 1;        end        else begin            CLK <= ~CLK;            ip <= 36'b0;        end    end        // 设置密码reg str_0, str_1, str_2, str_3;    reg in_0, in_1, in_2, in_3;    reg in__; reg vtrl;    integer count = 0;    // 计时器    integer timer = 5;    always @(posedge CLK) begin        if(sti_2 == 1'b1) begin            ctrl <= 1'b1;        end        in__ <= sti_1;        case(count)            0: begin                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b1;                num0_6 <= 1'b1;                num0_7 <= 1'b0;            end            1: begin                num0_1 <= 1'b0;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b0;;                num0_5 <= 1'b0;                num0_6 <= 1'b0;                num0_7 <= 1'b0;            end            2: begin                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b0;                num0_4 <= 1'b1;                num0_5 <= 1'b1;                num0_6 <= 1'b0;                num0_7 <= 1'b1;            end            3: begin                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b0;                num0_6 <= 1'b0;                num0_7 <= 1'b1;            end            4: begin                num0_1 <= 1'b0;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b0;                num0_5 <= 1'b0;                num0_6 <= 1'b1;                num0_7 <= 1'b1;            end            5: begin                num0_1 <= 1'b1;                num0_2 <= 1'b0;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b0;                num0_6 <= 1'b1;                num0_7 <= 1'b1;            end            6: begin                num0_1 <= 1'b1;                num0_2 <= 1'b0;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b1;                num0_6 <= 1'b1;                num0_7 <= 1'b1;            end            7: begin                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b0;                num0_5 <= 1'b0;                num0_6 <= 1'b0;                num0_7 <= 1'b0;            end            8: begin                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b1;                num0_6 <= 1'b1;                num0_7 <= 1'b1;            end            9: begin                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b0;                num0_6 <= 1'b1;                num0_7 <= 1'b1;            end            endcase        if(sti_2 == 1'b1) begin                in_0 <= pw_5;                in_1 <= pw_6;                in_2 <= pw_7;                in_3 <= pw_8;                if(pw_1 == 1'b1 && in_0 == str_0 && in_1 == str_1 && in_2 == str_2 && in_3 == str_3) begin                if(cc == 1'b0) begin                    count <= count;                    cc <= 1'b1;                end                    else begin                    count <= count + 1;                end                    green <= 1'b1;                    red <= 1'b0;                    alarm <= 1'b0;                end else if(pw_1 == 1'b1 && (in_0 != str_0 || in_1 != str_1 || in_2 != str_2 || in_3 != str_3)) begin                    if(cc == 1'b0) begin                        count <= count;                        cc <= 1'b1;                    end else begin                        count <= count +1 ;                    end                end else if(pw_1 == 1'b0) begin                    if(in_0 == str_0 && in_1 == str_1 && in_2 == str_2 && in_3 == str_3) begin                    if(cc == 1'b0) begin                        count <= count;                        cc <= 1'b1;                    end else begin                         count <= count +1;                    end                        green <= 1'b1;                        red <= 1'b0;                        alarm <= 1'b0;                    end                    count <= count;                end                if(count == 9) begin                    alarm <= 1'b1;                    red <= 1'b1;                    green <= 1'b0;                end        end        if(pw_1 == 1'b1) begin            case(timer)            0: begin               num1_1 <= 1'b1;               num1_2 <= 1'b1;               num1_3 <= 1'b1;               num1_4 <= 1'b1;               num1_5 <= 1'b1;               num1_6 <= 1'b1;               num1_7 <= 1'b0;            end            1: begin               num1_1 <= 1'b0;               num1_2 <= 1'b1;               num1_3 <= 1'b1;               num1_4 <= 1'b0;               num1_5 <= 1'b0;               num1_6 <= 1'b0;               num1_7 <= 1'b0;            end            2: begin               num1_1 <= 1'b1;               num1_2 <= 1'b1;               num1_3 <= 1'b0;               num1_4 <= 1'b1;               num1_5 <= 1'b1;               num1_6 <= 1'b0;               num1_7 <= 1'b1;            end            3: begin               num1_1 <= 1'b1;               num1_2 <= 1'b1;               num1_3 <= 1'b1;               num1_4 <= 1'b1;               num1_5 <= 1'b0;               num1_6 <= 1'b0;               num1_7 <= 1'b1;            end            4: begin               num1_1 <= 1'b0;               num1_2 <= 1'b1;               num1_3 <= 1'b1;               num1_4 <= 1'b0;               num1_5 <= 1'b0;               num1_6 <= 1'b1;               num1_7 <= 1'b1;            end            5: begin               num1_1 <= 1'b1;               num1_2 <= 1'b0;               num1_3 <= 1'b1;               num1_4 <= 1'b1;               num1_5 <= 1'b0;               num1_6 <= 1'b1;               num1_7 <= 1'b1;            end            endcase            if(in_0 == str_0 && in_1 == str_1 && in_2 == str_2 && in_3 == str_3) begin                timer <= timer;                red <= 1'b0;                green <= 1'b1;            end else if(ipr < 5) begin                timer <= timer;                red <= 1'b1;                green <= 1'b0;                ipr <= ipr + 1;            end else if(ipr == 5 && ctrl == 1'b1) begin                timer <= timer - 1;                red <= 1'b1;                green <= 1'b0;                ipr <= 0;            end            if(timer == 0) begin                red <= 1'b1;                green <= 1'b0;                alarm <= 1'b1;            end        end        else begin            timer <= 5;        end        if(in__ == 1'b1) begin                timer <= 5;                in_0 <= 0;                in_1 <= 0;                in_2 <= 0;                in_3 <= 0;                count <= 4'b0000;                ctrl = 1'b0;                green <= 1'b0;                cc <= 1'b0;                alarm <= 1'b0;                red <= 1'b1;                num0_1 <= 1'b1;                num0_2 <= 1'b1;                num0_3 <= 1'b1;                num0_4 <= 1'b1;                num0_5 <= 1'b1;                num0_6 <= 1'b1;                num0_7 <= 1'b0;                num1_1 <= 1'b1;                num1_2 <= 1'b0;                num1_3 <= 1'b1;                num1_4 <= 1'b1;                num1_5 <= 1'b0;                num1_6 <= 1'b1;                num1_7 <= 1'b1;        end        if(sti_0 == 1'b1) begin            str_0 <= pw_5;                str_1 <= pw_6;                str_2 <= pw_7;                str_3 <= pw_8;        end    endendmodule

管脚绑定：

set_property IOSTANDARD LVCMOS33 [get_ports alarm]
set_property IOSTANDARD LVCMOS33 [get_ports clk]
set_property IOSTANDARD LVCMOS33 [get_ports green]
set_property IOSTANDARD LVCMOS33 [get_ports num0_1]
set_property IOSTANDARD LVCMOS33 [get_ports num0_2]
set_property IOSTANDARD LVCMOS33 [get_ports num0_3]
set_property IOSTANDARD LVCMOS33 [get_ports num0_4]
set_property IOSTANDARD LVCMOS33 [get_ports num0_5]
set_property IOSTANDARD LVCMOS33 [get_ports num0_6]
set_property IOSTANDARD LVCMOS33 [get_ports num0_7]
set_property IOSTANDARD LVCMOS33 [get_ports num0_8]
set_property IOSTANDARD LVCMOS33 [get_ports num1_1]
set_property IOSTANDARD LVCMOS33 [get_ports num1_3]
set_property IOSTANDARD LVCMOS33 [get_ports num1_2]
set_property IOSTANDARD LVCMOS33 [get_ports num1_4]
set_property IOSTANDARD LVCMOS33 [get_ports num1_5]
set_property IOSTANDARD LVCMOS33 [get_ports pw_1]
set_property IOSTANDARD LVCMOS33 [get_ports num1_7]
set_property IOSTANDARD LVCMOS33 [get_ports num1_6]
set_property IOSTANDARD LVCMOS33 [get_ports num1_8]
set_property IOSTANDARD LVCMOS33 [get_ports pw_2]
set_property IOSTANDARD LVCMOS33 [get_ports pw_3]
set_property IOSTANDARD LVCMOS33 [get_ports pw_4]
set_property IOSTANDARD LVCMOS33 [get_ports sti_2]
set_property IOSTANDARD LVCMOS33 [get_ports sti_1]
set_property IOSTANDARD LVCMOS33 [get_ports red]
set_property IOSTANDARD LVCMOS33 [get_ports pw_8]
set_property IOSTANDARD LVCMOS33 [get_ports sti_0]
set_property IOSTANDARD LVCMOS33 [get_ports pw_6]
set_property IOSTANDARD LVCMOS33 [get_ports pw_7]
set_property IOSTANDARD LVCMOS33 [get_ports pw_5]
set_property PACKAGE_PIN K1 [get_ports alarm]
set_property PACKAGE_PIN H6 [get_ports green]
set_property PACKAGE_PIN H5 [get_ports red]
set_property PACKAGE_PIN B4 [get_ports num0_1]
set_property PACKAGE_PIN A4 [get_ports num0_2]
set_property PACKAGE_PIN A3 [get_ports num0_3]
set_property PACKAGE_PIN B1 [get_ports num0_4]
set_property PACKAGE_PIN A1 [get_ports num0_5]
set_property PACKAGE_PIN B3 [get_ports num0_6]
set_property PACKAGE_PIN B2 [get_ports num0_7]
set_property PACKAGE_PIN D5 [get_ports num0_8]
set_property PACKAGE_PIN D4 [get_ports num1_1]
set_property PACKAGE_PIN E3 [get_ports num1_2]
set_property PACKAGE_PIN D3 [get_ports num1_3]
set_property PACKAGE_PIN F4 [get_ports num1_4]
set_property PACKAGE_PIN F3 [get_ports num1_5]
set_property PACKAGE_PIN E2 [get_ports num1_6]
set_property PACKAGE_PIN D2 [get_ports num1_7]
set_property PACKAGE_PIN H2 [get_ports num1_8]
set_property PACKAGE_PIN P5 [get_ports pw_1]
set_property PACKAGE_PIN P4 [get_ports pw_2]
set_property PACKAGE_PIN P3 [get_ports pw_3]
set_property PACKAGE_PIN P2 [get_ports pw_4]
set_property PACKAGE_PIN R2 [get_ports pw_5]
set_property PACKAGE_PIN M4 [get_ports pw_6]
set_property PACKAGE_PIN N4 [get_ports pw_7]
set_property PACKAGE_PIN R1 [get_ports pw_8]
set_property PACKAGE_PIN U4 [get_ports sti_0]
set_property PACKAGE_PIN R17 [get_ports sti_1]
set_property PACKAGE_PIN R15 [get_ports sti_2]

set_property PACKAGE_PIN P17 [get_ports clk]

set_property IOSTANDARD LVCMOS33 [get_ports x]
set_property IOSTANDARD LVCMOS33 [get_ports y]
set_property PACKAGE_PIN G2 [get_ports x]
set_property PACKAGE_PIN G6 [get_ports y]