From 2b2e6c244be4f7fc9e18ebdc5030bc34bb406990 Mon Sep 17 00:00:00 2001
From: uvok
Date: Fri, 26 Dec 2025 11:22:28 +0100
Subject: Improve testbench

use for loops / always blocks.
specify timescale.
---
 led_toggle_bouncy.tb.v | 70 +++++++++++++++-----------------------------------
 1 file changed, 20 insertions(+), 50 deletions(-)

(limited to 'led_toggle_bouncy.tb.v')

diff --git a/led_toggle_bouncy.tb.v b/led_toggle_bouncy.tb.v
index e7cdfc0..37aa95b 100644
--- a/led_toggle_bouncy.tb.v
+++ b/led_toggle_bouncy.tb.v
@@ -1,9 +1,12 @@
+`timescale 1us/1ns
+
 module led_toggle_bouncy_tb (
 );
 
 reg clk_i;
 reg key_i;
 wire [5:0] led;
+integer i = 0;
 
 led_toggle_bouncy uut(
   .clk_i(clk_i),
@@ -12,65 +15,32 @@ led_toggle_bouncy uut(
 );
 
 initial begin
-  $dumpfile("led_toggle_bouncy.lxt2"); $dumpvars();
-
   clk_i <= 0;
   key_i <= 1'b1;
 
-  #10
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-
-  #5
-  key_i <= ~key_i;
-  #5
+  $dumpfile("led_toggle_bouncy.lxt2"); $dumpvars();
+end
 
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
+always #10 clk_i = ~clk_i;
 
-  #5
-  key_i <= ~key_i;
-  #5
 
-  clk_i <= ~clk_i;
-  #5
-  key_i <= ~key_i;
-  #5
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #5
-  key_i <= ~key_i;
-  #5
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #5
+initial begin
+  // initial key press
+  #25
   key_i <= ~key_i;
-  #5
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #5
+  #40
   key_i <= ~key_i;
-  #5
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #10
-  clk_i <= ~clk_i;
-  #10
 
+  // try bouncing
+
+  #50
+
+  for (i=0; i < 20; i = i + 1) begin
+    #20
+    key_i <= ~key_i;
+  end
+
+  #105
   $finish();
 end
 
-- 
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