smallkeybaord.v.bak

用verilog写的4*4小键盘按键检测程序。本工程已经编译好。可以直接在Atera DE1 Fpga开发板上运行

module	smallkeybaord(GPIO1,GPIO2,clk,LEDG);
output	reg [3:0]GPIO1;
output	reg	[3:0]LEDG;
input	[3:0]GPIO2;
input	clk;
integer i=4096,j=0,k;
reg		[1:0]temp;

always@(posedge clk)
begin
	if(i<4096)
		i=i+1;
	else
		i=0;
	temp=(i/1024);
	LEDG=4'H0;
end
always@(temp)
begin
	LEDG=0;
	GPIO1=4'HF;
	GPIO1[temp]=0;
	for(j=0;j<4;j=j+1)
		if(GPIO2[j]==0)
			LEDG=(temp*4+j);
end
endmodule