Modelsim仿真不出来波形，不知道.v文件程序错在哪

课程实践，编写简单的模13奇数分频器
编写程序实在找不出来什么问题，但是仿真始终没有波形
这是分频器的代码

module fenpin13
(input clk,reset,
output wire cout);
reg [4:0]m,n;
reg cout1,cout2;
assign cout=cout1|cout2;
always @(posedge clk)
begin if(!reset) begin cout1<=0;m<=0;end
else
begin if(m==12) m<=0;else m<=m+1;
if(m<6) cout1<=1;else cout1<=0;
end
end
always @(posedge clk)
begin if(!reset) begin cout2<=0;n<=0;end
else begin
if(n==12) n<=0;else n<=n+1;
if(n<6) cout2<=1;else cout2<=0;end
end
endmodule

这是testbench文件的代码

`timescale 1ns/1ns
module fenpin13_tb;
reg clk,reset;
wire cout,cout1,cout2;
wire [4:0]m,n;
fenpin13 u1(clk,reset,cout);
parameter PERIOD=100;
initial
begin
reset=0;clk=0;
#40 reset=1;
forever
#(PERIOD/2) clk=~clk;
end
endmodule

最后运行modelsim始终无波形

本人是初学者，希望可以多指教，谢谢！

1：fenpin13 奇数分频，需要用上升沿和下降沿分别计数分频后再合成
第二个分频改用 always @(negedge clk)
2：仿真部分，复位信号时间太短
3：仿真部分，复位信号有效时要有时钟触发

module fenpin13
(
    input clk,reset,
    output wire cout
);
reg [4:0]m,n;
reg cout1,cout2;
assign cout=cout1|cout2;

always @(posedge clk)
begin
    if(!reset)
    begin
        cout1<=0;
        m<=0;
    end
    else
    begin
        if(m==12)    m<=0;
        else            m<=m+1;

        if(m<6)    cout1<=1;
        else    cout1<=0;
    end
end

always @(negedge clk)
begin
    if(!reset)
    begin
        cout2<=0;
        n<=0;
    end
    else
    begin
        if(n==12)    n<=0;
        else        n<=n+1;
        if(n<6)    cout2<=1;
        else    cout2<=0;
    end
end
endmodule

`timescale 1ns/1ns
module fenpin13_tb;
reg clk,reset;
wire cout,cout1,cout2;
wire [4:0]m,n;
fenpin13 u1(clk,reset,cout);
parameter PERIOD=100;
initial
begin
    reset=0;
    clk=0;
    #200 reset=1;
end
always
    #(PERIOD/2) clk=~clk;

endmodule