Added kempston, autofire and enable autofire, enable turbo push buttons for GPIO1[32] and GPIO1[33]

debouncer.v

@@ -0,0 +1,30 @@
+module debouncer(input i_Clk, input i_Switch, output o_Switch);
+ 
+  parameter c_DEBOUNCE_LIMIT = 1100000;  // 30 ms at 50 MHz
+   
+  reg [20:0] r_Count = 0;
+  reg r_State = 1'b0;
+ 
+  always @(posedge i_Clk)
+  begin
+    // Switch input is different than internal switch value, so an input is
+    // changing.  Increase the counter until it is stable for enough time.  
+    if (i_Switch !== r_State && r_Count < c_DEBOUNCE_LIMIT)
+      r_Count <= r_Count + 1;
+ 
+    // End of counter reached, switch is stable, register it, reset counter
+    else if (r_Count == c_DEBOUNCE_LIMIT)
+    begin
+      r_State <= i_Switch;
+      r_Count <= 0;
+    end 
+ 
+    // Switches are the same state, reset the counter
+    else
+      r_Count <= 0;
+  end
+ 
+  // Assign internal register to output (debounced!)
+  assign o_Switch = r_State;
+ 
+endmodule