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按键去抖/*--------------------------------------------------------
-- Engineer: zhrscut
-- Create Date:
-- Module Name:
-- Tool Versions: Quartus_II 9.1
-- -EEPWFPGA°DIY
------------------------------------------------------*/
module stable_key(clk,key_in,led);
input clk;
input key_in;
output led;
reg key_d,key,key_out;
reg[31:0] cnt=0;
always @(posedge clk)
begin
if(key!=key_in)
begin
cnt<=0;
key_d<=key_in;
end
else if(cnt==199_9999) //±10ms
begin
key_out<=~key_d;
cnt<=0;
end
else
cnt<=cnt+1;
key<=key_in;
end
assign led=key_out;
endmodule
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