.
├── compile.sh
├── sec_count.v
└── stimulus_tb.v
代码在git
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sec_count.v
//2022-05-18 ,罗干
//秒计数器,0-9 循环;
`timescale 1ns/10ps
module s_counter(
clk,
res,
s_num,
);
input clk;
input res;
output[3:0] s_num;
reg[24:0] con_t; //秒脉冲分频计数器
parameter frequency_clk=24; //24MHz
reg s_pulse ; //秒脉冲尖;
reg[3:0] s_num;
always@(posedge clk or negedge res )
if (~res )begin
con_t<=0;s_pulse<=0;s_num<=0;
end
else begin
if (con_t==frequency_clk*1000-1)begin
con_t<=0;
end
else begin
con_t<=con_t+1;
end
if (con_t==0)begin
s_pulse <=1;
end
else begin
s_pulse <=0;
end
if (s_pulse) begin
if (s_num==9) begin
s_num<=0;
end
else begin
s_num <=s_num +1;
end
end
end
endmodule
stimulus_tb.v
//-----testbench of s_counter-----
`timescale 1 ns/10 ps
module m_gen_tb;
reg clk,res;
wire[3:0] s_num;
s_counter s_counter( .clk(clk),
.res(res),
.s_num(s_num));
initial begin
$dumpfile("test.vcd");
$dumpvars(0,m_gen_tb);
clk<=0 ;res<=0;
#17 res<=1;
# 10000000 $stop;
end
always #5 clk=~clk;
endmodule
compile.sh
#!/bin/bash
echo "开始编译"
iverilog sec_count.v stimulus_tb.v -o fn
#./invet
echo "编译完成"
vvp -n fn -lxt2
echo "生成波形文件"
cp test.vcd wave.lxt
echo "打开波形文件"
gtkwave wave.lxt
