module Scan_key(pReset,scan_clk,scan_port,key_status);
parameter Buff_WIDTH = 8; //缓冲区深度
input pReset; //复位信号
input scan_clk; //扫描时钟
input scan_port; //扫描端口
output key_status; //消抖后的键状态
reg key_status;
reg [Buff_WIDTH-1:0]key_buff; //消抖缓冲区
always @(posedge pReset or posedge scan_clk)
begin
if(pReset) //复位状态
begin
key_buff = 0;
end
else //扫描状态
begin
key_buff = {key_buff[Buff_WIDTH-1:1],scan_port};
//填入新扫描数据
end
end
always @(key_buff)
begin
if(key_buff == {Buff_WIDTH{0}}) //全部为0
key_status = 0;
else if(key_buff == {Buff_WIDTH{1}}) //全部为1
key_status = 1;
else
key_status = key_status;
end
endmodule
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