What is the Verilog HDL implementation of the keystroke scanning interface
Today, I will talk to you about the Verilog HDL implementation of the key scanning interface. Many people may not know much about it. In order to let you know more, Xiaobian summarizes the following contents for you. I hope you can gain something according to this article.
Interface scanning module of 4*4 matrix keyboard implemented by Verilog HDL.
module button_scan(
clk,in,out,num
);
input clk;
input [3:0]in;
output [3:0]out;
output [4:0]num;
reg [4:0]num;
reg [1:0]cnt=0;
reg [1:0]tmp=0;
reg [3:0]out_reg=0;
wire [7:0]dsample;
assign dsample={out_reg,in};
assign out=out_reg;
//generate the column of martix
always @ ( posedge clk )
begin
cnt
