【FPGA】使用移位实现LED流水灯
一、原理
- 时钟信号
- 复位信号
- 输出管脚，位宽为8，因为要点亮8个灯
二、注意
1.
2.
将光标拖到红线处可以提示报错信息
3.
这个25000000-1值影响仿真速度，在仿真时少些时间，将500ms变成了5000us
三、源文件
verilog
`timescale 1ns / 1ps
//////////////////////////////////////////////////////////////////////////////////
// Company:
// Engineer:
//
// Create Date: 2025/11/07 21:16:22
// Design Name:
// Module Name: led_run
// Project Name:
// Target Devices:
// Tool Versions:
// Description:
//
// Dependencies:
//
// Revision:
// Revision 0.01 - File Created
// Additional Comments:
//
//////////////////////////////////////////////////////////////////////////////////
module led_run(
Clk,
Reset_n,
Led
);
input Clk;
input Reset_n;
output reg [7:0]Led;
reg [24:0] counter;
always@(posedge Clk or negedge Reset_n)
if(!Reset_n)
counter <=0;
else if(counter ==25000000-1)
counter<=0;
else
counter<= counter+1'd1;
always@(posedge Clk or negedge Reset_n)
if(!Reset_n)
Led <= 8'b0000_0001;
else if(counter ==25000000-1)begin
if((Led==8'b1000_0000)|Led==8'b0000_0000)
Led<=8'b0000_0001;
else
Led <=Led<<1;
end
endmodule
仿真代码
`timescale 1ns / 1ns
module led_run_tb();
reg Clk;
reg Reset_n;
wire [7:0]Led;//位宽八位led_run led_run(
.Clk(Clk),
.Reset_n(Reset_n),
.Led(Led)
);
initial Clk = 1;
always #10 Clk = ~Clk;
initial begin
Reset_n = 0;
#201;
Reset_n = 1;
//#4000_000_000;32位有符号数不能表示已经超过最大值，换另一种表达方式
//#2000_000_000;
//#2000_000_000;
#40_000_000;//缩短时间，提高仿真效率
$stop;
end
endmodule
管脚文件
set_property PACKAGE_PIN Y18 [get_ports Clk]
set_property IOSTANDARD LVCMOS33 [get_ports Clk]
set_property PACKAGE_PIN B21 [get_ports Reset_n]
set_property IOSTANDARD LVCMOS33 [get_ports Reset_n]
set_property PACKAGE_PIN M22 [get_ports Led[0]]
set_property PACKAGE_PIN N22 [get_ports Led[1]]
set_property PACKAGE_PIN L21 [get_ports Led[2]]
set_property PACKAGE_PIN K21 [get_ports Led[3]]
set_property PACKAGE_PIN K22 [get_ports Led[4]]
set_property PACKAGE_PIN J22 [get_ports Led[5]]
set_property PACKAGE_PIN H22 [get_ports Led[6]]
set_property PACKAGE_PIN M21 [get_ports Led[7]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[0]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[1]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[2]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[3]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[4]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[5]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[6]]
set_property IOSTANDARD LVCMOS33 [get_ports Led[7]]