Add Lab work No2

ld2/debounce_switch.v

@@ -0,0 +1,41 @@
+///////////////////////////// 
+// Author - Imants Pulkstenis
+// Date - 24.03.2020
+// Project name - Lab work No2 - Counter
+// Module name - debounce module module for reset button
+//
+// Detailed module description:
+//
+// This module is for debouncing push button
+//
+//
+// Revision:
+// A - initial design
+// B - 
+// 
+//
+/////////////////////////////
+module debounce_switch(
+    input clk,
+    input i_switch,
+    output o_switch);
+
+    parameter c_debounce_limit=1_000_000;// 10ms at 100MHz
+
+reg r_state=1'b0;
+reg [19:0] r_count = 0;
+
+    always@(posedge clk)begin
+        if (i_switch != r_state && r_count < c_debounce_limit)
+            r_count <= r_count +1; //counter
+        else if (r_count == c_debounce_limit)begin
+            r_count <=0;
+            r_state <= i_switch;
+        end
+        else
+            r_count<=0;
+    end
+
+assign o_switch=r_state;
+
+endmodule