From e1c081bd2089b87808c592e3dabc4ac464b2a57c Mon Sep 17 00:00:00 2001
From: uvok
Date: Fri, 26 Dec 2025 15:12:58 +0100
Subject: Add working toggle implementation

---
 led_toggle.tb.v | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 led_toggle.v    | 31 +++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 led_toggle.tb.v
 create mode 100644 led_toggle.v

diff --git a/led_toggle.tb.v b/led_toggle.tb.v
new file mode 100644
index 0000000..f6c6dad
--- /dev/null
+++ b/led_toggle.tb.v
@@ -0,0 +1,55 @@
+`timescale 1us/1ns
+
+module led_toggle_tb (
+);
+
+reg clk_i;
+reg rst_i;
+reg key_i;
+wire [5:0] led;
+integer i = 0;
+
+led_toggle uut(
+  .rst_i(rst_i),
+  .clk_i(clk_i),
+  .key_i(key_i),
+  .led(led)
+);
+defparam uut.STABLE_PERIOD = 2;
+
+initial begin
+  $dumpfile("led_toggle.lxt2"); $dumpvars();
+  clk_i <= 0;
+  key_i <= 1'b1;
+  #1
+  rst_i <= 0;
+  #1
+  rst_i <= 1;
+end
+
+always #10 clk_i = ~clk_i;
+
+
+initial begin
+  // initial key press
+  #25
+  key_i <= ~key_i;
+  #40
+  key_i <= ~key_i;
+
+  // try bouncing
+
+  #50
+
+  for (i=0; i < 19; i = i + 1) begin
+    #20
+    key_i <= ~key_i;
+  end
+  #200
+  key_i <= ~key_i;
+
+  #205
+  $finish();
+end
+
+endmodule
diff --git a/led_toggle.v b/led_toggle.v
new file mode 100644
index 0000000..df86bf8
--- /dev/null
+++ b/led_toggle.v
@@ -0,0 +1,31 @@
+// From the book
+// bouncy variant
+
+`include "led_toggle_bouncy.v"
+`include "debounce.v"
+
+module led_toggle (
+  input rst_i,
+  input clk_i,
+  input key_i,
+  output [5:0] led
+);
+parameter STABLE_PERIOD = 50;
+
+wire outsig;
+
+debounce db(
+  .rst_i(rst_i),
+  .clk_i(clk_i),
+  .signal_i(key_i),
+  .signal_o(outsig)
+);
+defparam db.STABLE_PERIOD = STABLE_PERIOD;
+
+led_toggle_bouncy tgler(
+  .clk_i(clk_i),
+  .key_i(outsig),
+  .led(led)
+);
+
+endmodule
-- 
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