clk1 <= 0;
end end
always@(main_state or correct or error) begin
case(main_state) waits:
if(correct==1) //由waits转换到pass的条件 next_state=pass; else if(error==1&&try_count==1) else
next_state=waits;
next_state=alarm; //由waits转换到alarm的条件
pass:
if(pass_count[7]==1)//由pass转换到waits的条件 next_state=waits;
else next_state=pass; alarm:
if(alarm_count[10]==1)// 由alarm转换到waits的条件 next_state=waits;
else next_state=alarm; default://默认状态：waits next_state=waits;
endcase end
//状态转换
always@(posedge clk1 or negedge resetb) begin
if(!resetb) main_state<=waits; else main_state<=next_state;
end
//输出控制部分
always@(posedge clk1 or negedge resetb)
begin if(!resetb)//复位时，开锁输出与警报输出都为零
begin passed<=8'b00000000;
alarmed<=8'b00000000;
end else if(main_state==pass)//当主机状态为pass时，开锁
begin
passed<=8'b00000001; alarmed<=8'b00000000; end else if(main_state==alarm)//当主机状态为alarm时，警报
begin passed<=8'b00000000;
alarmed<=8'b00000001;
end
else//其它状态复位
begin
passed<=8'b00000000;
alarmed<=8'b00000000; end end
//alarm一段时间后，自动进入waits状态 //alarm定时器
always@(posedge clk1 or negedge resetb) begin
if(!resetb) alarm_count<=0;
else if(main_state==alarm)//alarm状态计时器alarm定时器加1 alarm_count<=alarm_count+1; else alarm_count<=0;
end
//锁pass以后计数开始，当规定的时间到达后自动上锁，并进入waits状态 //pass定时器
always@(posedge clk1 or negedge resetb) begin
if(!resetb) pass_count<=0;
else if(main_state==pass) //pass状态计时器pass定时器加1 pass_count<=pass_count+1; else pass_count<=0;
end
//从状态机，用于输入4位密码
always@(posedge clk1 or negedge resetb) begin if(!resetb)
sub_state<=first; else sub_state<=next_sub_state;
end
always@(!zero||!one||!two||!three||!four||!yes or sub_state) //always@(key or sub_state) begin
if(key_pressed_flag||!yes) if(!yes)//4个密码输完时，进行确认
if
next_sub_state=first;
//default为输入了某位密码，输入完自动将状态转入下一位 else
(!zero||!one||!two||!three||!four)
case(sub_state)
first: next_sub_state=second; second: next_sub_state=third; third: next_sub_state=fourth; fourth:
next_sub_state=finish;
//当输入完4位密码以后状态保持不变，等待输入enter命 //令
finish: next_sub_state=finish; default: next_sub_state=sub_state; endcase
else
next_sub_state=sub_state; end
//比较密码，产生正确或者错误信息 always@(posedge clk1 or negedge resetb) begin
if(!resetb) begin
end
correct<=0; error<=0;
else if(!key_pressed_flag&&!yes) if(password==PASSWORD)//密码正确时
begin correct<=1;
error<=0; end
else//密码错误时
end
begin
error<=1; correct<=0; end else
begin correct<=0; error<=0; end
//记录密码
always@(posedge clk1 or negedge resetb) begin if(!resetb)
password<=0;
else if(!zero||!one||!two||!three||!four)
case(sub_state) first: password[15:12]<=key; second: password[11:8]<=key; third: password[7:4]<=key; fourth: password[3:0]<=key; default: password<=password;
endcase else password<=password;
end
//记录错误次数
always@(posedge clk1 or negedge resetb) begin
if(!resetb) try_count<=0;
else if(error==1)
try_count<=try_count+1;
else if(main_state==pass||main_state==alarm) try_count<=0; end
always@(posedge clk1 or negedge resetb) begin
if(!resetb) begin
key_pressed_flag<=0; key=4'b0000; end
else if(!zero&&change) begin key_pressed_flag<=1;key<=4'b0000; end else if(!one&&change) begin key_pressed_flag<=1;key<=4'b0001; end else if(!two&&change)
begin key_pressed_flag<=1;key<=4'b0010; end else if(!three&&change)
begin key_pressed_flag<=1;key<=4'b0011; end else if(!four&&change)
begin key_pressed_flag<=1;key<=4'b0100; end else if(!zero&&!change) begin key_pressed_flag<=1;key<=4'b0101; end else if(!one&&!change)
begin key_pressed_flag<=1;key<=4'b0110; end else if(!two&&!change)
begin key_pressed_flag<=1;key<=4'b0111; end else if(!three&&!change)
begin key_pressed_flag<=1;key<=4'b1000; end else if(!four&&!change)
begin key_pressed_flag<=1;key<=4'b1001; end else if(!yes)
begin key_pressed_flag<=0;key<=4'b1010; end
End
//diaplay分频后显示 always @(posedge clk0) begin
CNT_R0 <= CNT_R0 + 1'b1;
if(CNT_R0 < 4096) begin
clk0_div <= 1; end else
begin
clk0_div <= 0; end end
////按下change切换输入数的范围