X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/d5f3776614009b3b5232952350cc281d7e0c422f..refs/heads/master:/PS2Button.v?ds=inline

diff --git a/PS2Button.v b/PS2Button.v
index e65226c..81a0e89 100644
--- a/PS2Button.v
+++ b/PS2Button.v
@@ -1,26 +1,41 @@
 module PS2Button(
+	input clk,
 	input inclk,
 	input indata,
-	input rst,
-	output outclk,
-	output outdata,
-	output reg [7:0] buttons
+	output wire [7:0] buttons
 	);
 
-	assign outdata = 1'b1;
-	assign outclk = 1'b1;
-
-	reg bitcount [3:0] = 0;
-	reg [7:0] key;
-	reg keyarrow, keyup, parity;
-	reg key_a,key_b,key_st,key_sel,key_up,key_dn,key_l,key_r;
+	reg [3:0] bitcount = 0;
+	reg [7:0] key = 0;
+	reg keyarrow = 0, keyup = 0, parity = 0;
+	reg key_a = 0,key_b = 0,key_st = 0,key_sel = 0,key_up = 0,key_dn = 0,key_l = 0,key_r = 0;
 
 	assign buttons = {key_st,key_sel,key_b,key_a,key_dn,key_up,key_l,key_r};
+	
+	/* Clock debouncing */
+	reg lastinclk = 0;
+	reg [5:0] debounce = 0;
+	reg fixedclk = 0;
+	reg [9:0] resetcountdown = 0;
+	
+	always @(posedge clk) begin
+		if (inclk != lastinclk) begin
+			lastinclk <= inclk;
+			debounce <= 1;
+			resetcountdown <= 10'b1111111111;
+		end else if (debounce == 0) begin
+			fixedclk <= inclk;
+			resetcountdown <= resetcountdown - 1;
+		end else
+			debounce <= debounce + 1;
+	end
 
-	always @ (negedge inclk) begin
-		if(bitcount == 10) begin
+	always @(negedge fixedclk) begin
+		if (resetcountdown == 0)
+			bitcount <= 0;
+		else if (bitcount == 10) begin
 			bitcount <= 0;
-			if(parity == (^ key)) begin
+			if(parity != (^ key)) begin
 				if(keyarrow) begin
 					keyarrow <= 0;
 					case(key)