leg_input.v

module led_input(GPIO,hled1,CLK);

input GPIO,CLK;

output [7:0] hled1;

reg [127:0] rand;
reg [6:0] offset;
reg [25:0] count = 0;

reg [10:0] input_max = 0;
reg [4:0] head = 0;
reg [16:0] input_count = 0;
reg [16:0] bit_error_count = 0;
reg [6:0] bit_error_rate = 0;

reg input_scan,debug_num;
integer n = 0;


/* mk retu create */
	function[127:0] randc;
		input [6:0] rand;
		integer i;
		begin
			randc[6:0] = rand;
			i = 7;
			while(i < 127) begin
			randc[i] = randc[i-7]^randc[i-1];
			i = i+1;
			end	
			randc[127] = 0; 
		end
	endfunction

	
always @(posedge CLK) begin
if(count == 4) count <= 0; /* 1250 = 25us */
else count <= count +1;
end	
assign enable = (count == 0)?1:0;
	
always @(posedge CLK) begin
	if(enable == 1) begin
		rand = randc(7'b1111111);
		offset = offset +1; end 
end

/* ********kokomade********* */

/* hikaku */
always @(posedge CLK) begin
if(enable == 1) begin
	if(input_max < 1001) begin 
		if(head != 7) begin
			if(GPIO == 1) begin
				head = head + 1;
				n = n + 1;	end
			else begin
				head = 0; 
				n = 0; end
		end
		else begin
			if(GPIO == rand[n]) begin
				n = n + 1;
				input_count = input_count + 1; end
			else begin
				n = n + 1;
				input_count = input_count + 1;
				bit_error_count = bit_error_count + 1; end
			if(n == 128) begin n = 0; end
			bit_error_rate = 100*bit_error_count/input_count;
			input_max = input_max + 1;
		end
	end	
end
end

always @(posedge CLK) begin
	if(enable == 1) begin
		input_scan = GPIO;
	end
	if(input_max == 1000) begin
		debug_num = 1; 
	end
end

/* output */
assign hled1[5:0] = bit_error_count[5:0];
assign hled1[6] = debug_num; /* debug yo */
assign hled1[7] = input_scan; /* debug yo sono2 */

endmodule