注意：轉載必須附上原網址，附上作者名，謝謝。
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
end
endmodule
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 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]
set_property IOSTANDARD LVCMOS33 [get_ports y]
set_property PACKAGE_PIN G2 [get_ports x]
set_property PACKAGE_PIN G6 [get_ports y]