add aditional modules for start/stop

and for up down counter

ld2/flip_flop.v

@@ -0,0 +1,32 @@
+///////////////////////////// 
+// Author - Imants Pulkstenis
+// Date - 24.03.2020
+// Project name - Lab work No2 - Counter
+// Module name - SR latch module for counter
+//
+// Detailed module description:
+//
+// This is Flip Flop for START/STOP function
+//
+// Revision:
+// A - initial design
+// B - 
+// 
+//
+/////////////////////////////
+
+module flip_flop (   
+    input clk,
+    input rst,
+    input t,
+    output reg q);
+ 
+always @ (posedge clk) begin
+    if (!rst) 
+      q <= 0;
+    else if (t)
+        q <= ~q;
+    else
+        q <= q;
+  end
+endmodule