ispLEVER，输入值没能赋给中间变量

Question

课设任务，中间有一部分是用三个开关n0n1n2给中间值temp赋值为00,01,10

/*
clk:时钟信号
n0,n1,n2:密码输入信号
lock:状态显示信号
reset:复位信号
set:密码确认信号
*/
module code(lock,warning,num1,num2,num3,num4,clkin,n0,n1,n2,set,reset,close,temp);
input n0,n1,n2,set,reset,clkin,close;
output reg [1:0]temp;
output reg [1:0]num1,num2,num3,num4;
output reg lock,warning;
reg [1:0]i;
always@(posedge n0||n1||n2)
begin
case({n2,n1,n0})
3'b001:temp<=2'b00;
3'b010:temp<=2'b01;
3'b100:temp<=2'b10;
endcase
end
begin
case(i)
2'b00:begin 
num1<=temp;
i<=1;
end
2'b01:begin 
num2<=temp;
i<=2;
end
2'b10:begin 
num3<=temp;
i<=3;
end
2'b11:begin 
num4<=temp;
i<=0;
end
default: i<=2'b00;
endcase
end
always@(*)
    begin
        if(!lock&&set)
        begin
            if({(num4==2'b01)&&(num3==2'b00)&&(num2==2'b01)&&(num1==2'b01)})
            lock<=1;
            else 
            begin
                lock<=0;
                warning<=1;
            end
        end     
        if(lock&&close)
            lock<=0;
        if(reset)
            warning<=0;
            num1<=0;
            num2<=0;
            num3<=0;
            num4<=0;
            i<=2'b00;
    end
endmodule

synplify时，automake log里出现这样的提示：

@W: CG1160 :"C:\users\a2763\documents\tencent files\2763739926\filerecv\light\code.v":14:16:14:26|Found complex event expression
@W: CL118 :"C:\users\a2763\documents\tencent files\2763739926\filerecv\light\code.v":58:3:58:4|Latch generated from always block for signal warning; possible missing assignment in an if or case statement.
@W: CL207 :"C:\users\a2763\documents\tencent files\2763739926\filerecv\light\code.v":56:3:56:4|All reachable assignments to lock assign 0, register removed by optimization.
@W: CL159 :"C:\users\a2763\documents\tencent files\2763739926\filerecv\light\code.v":9:25:9:29|Input clkin is unused
@W: CL159 :"C:\users\a2763\documents\tencent files\2763739926\filerecv\light\code.v":9:31:9:35|Input close is unused
@W: MT462 :|Net set_c appears to be an unidentified clock source. Assuming default frequency. 

跑波形，发现temp总是为0

如果在case({n2,n1,n0})之前加个temp<=2'b11;波形就会变成这样

这个bug卡了好几天了，课设死线将至，万策尽yi