X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/77ab69d7bb0902e6ebf0994159ed2205f8413e34..refs/heads/master:/PS2Button.v?ds=inline

diff --git a/PS2Button.v b/PS2Button.v
index 169346c..81a0e89 100644
--- a/PS2Button.v
+++ b/PS2Button.v
@@ -1,4 +1,5 @@
 module PS2Button(
+	input clk,
 	input inclk,
 	input indata,
 	output wire [7:0] buttons
@@ -10,9 +11,29 @@ module PS2Button(
 	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(keyarrow) begin